8-Bit, MSPS Dual TxDAC+® Converter AD9709* DVDD DCOM AVDD ACOM CL
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FEATURES 8-Bit Dual Transmit MSPS Update Rate Excellent SFDR Nyquist Output Excellent Gain Offset Matching: 0.1% Fully Independent Single Resistor Gain Control Dual Port Interleaved Data On-Chip Reference Single Supply Operation Power Dissipation: Power-Down Mode: 48-Lead LQFP APPLICATIONS Communications Basestations Digital Synthesis Quadrature Modulation Ultrasound PRODUCT DESCRIPTION
8-Bit, MSPS Dual TxDAC+® Converter AD9709*
DVDD DCOM AVDD ACOM CLK1 IOUTA1 IOUTB1 REFIO FSADJ1 FSADJ2 GAINCTRL SLEEP IOUTA2 IOUTB2
PORT1
LATCH
WRT1 WRT2
REFERENCE DIGITAL INTERFACE
AD9709
BIAS GENERATOR
PORT2
LATCH MODE
CLK2
AD9709 dual-port, high-speed, two-channel, 8-bit CMOS DAC. integrates high-quality 8-bit TxDAC+ cores, voltage reference, digital interface circuitry into small 48-lead LQFP package. AD9709 offers exceptional performance while supporting update rates MSPS. AD9709 been optimized processing data communications applications. digital interface consists double-buffered latches well control logic. Separate write inputs allow data written ports independent another. Separate clocks control update rate DACs. mode control allows AD9709 interface separate data ports, single interleaved high-speed data port. interleaving mode, input data stream demuxed into original data then latched. data then converted DACs updated half input data rate. GAINCTRL allows modes setting full-scale current (IOUTFS) DACs. IOUTFS each independently using external resistors, IOUTFS both DACs using single external resistor.
DACs utilize segmented current source architecture combined with proprietary switching technique reduce glitch energy maximize dynamic accuracy. Each provides differential current output thus supporting single-ended differential applications. Both DACs simultaneously updated provide nominal full-scale current full-scale currents between each matched within 0.1%. AD9709 manufactured advanced low-cost CMOS process. operates from single supply consumes power.
PRODUCT HIGHLIGHTS
AD9709 member pin-compatible family dual TxDACs providing 10-, 12-, 14-bit resolution. Dual 8-Bit, MSPS DACs: pair high-performance DACs optimized low-distortion performance provide flexible transmission information. Matching: Gain matching typically 0.1% full-scale, offset error better than 0.02%. Power: Complete CMOS Dual function operates from single supply. full-scale current reduced lower power operation, sleep mode provided low-power idle periods. On-Chip Voltage Reference: AD9709 includes 1.20 temperature-compensated bandgap voltage reference.
TxDAC+ registered trademark Analog Devices, Inc. *Patent pending.
Dual 8-Bit Inputs: AD9709 features flexible dual-port interface allowing dual interleaved input data.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2000
AD9709-SPECIFICATIONS
SPECIFICATIONS
Parameter RESOLUTION ACCURACY Integral Linearity Error (INL) Differential Nonlinearity (DNL) ANALOG OUTPUT Offset Error Gain Error (Without Internal Reference) Gain Error (With Internal Reference) Gain Match 25°C TMIN TMAX TMIN TMAX Full-Scale Output Current2 Output Compliance Range Output Resistance Output Capacitance REFERENCE OUTPUT Reference Voltage Reference Output Current3 REFERENCE INPUT Input Compliance Range Reference Input Resistance Small Signal Bandwidth TEMPERATURE COEFFICIENTS Offset Drift Gain Drift (Without Internal Reference) Gain Drift (With Internal Reference) Reference Voltage Drift POWER SUPPLY Supply Voltages AVDD DVDD Analog Supply Current (IAVDD) Digital Supply Current (IDVDD)4 Digital Supply Current (IDVDD)5 Supply Current Sleep Mode (IAVDD) Power Dissipation4 IOUTFS Power Dissipation5 IOUTFS Power Dissipation6 IOUTFS Power Supply Rejection Ratio7-AVDD Power Supply Rejection Ratio7-DVDD OPERATING RANGE
TMAX, AVDD DVDD IOUTFS unless otherwise noted)
-0.5 -0.5 -0.02 -0.3 -1.6 -0.14 -1.0 +0.5 +0.5 +0.02 +0.3 +1.6 +0.14 20.0 +1.25 Unit Bits FSR/°C FSR/°C FSR/°C ppm/°C
0.25
1.14 1.20 1.26
1.25
+0.4 +0.025
-0.4 -0.025
FSR/V FSR/V
NOTES Measured IOUTA, driving virtual ground. Nominal full-scale current, OUTFS, times IREF current. external buffer amplifier with input bias current <100 should used drive external load. Measured fCLOCK MSPS fOUT MHz. Measured fCLOCK MSPS MHz. Measured unbuffered voltage output with OUTFS RLOAD IOUTA IOUTB, fCLOCK MSPS MHz. power supply variation. Specifications subject change without notice.
REV.
AD9709 DYNAMIC SPECIFICATIONS
Parameter DYNAMIC PERFORMANCE Maximum Output Update Rate (fCLOCK) Output Settling Time (tST) 0.1%)1 Output Propagation Delay (tPD) Glitch Impulse Output Rise Time (10% 90%)1 Output Fall Time (90% 10%)1 Output Noise (IOUTFS Output Noise (IOUTFS LINEARITY Spurious-Free Dynamic Range Nyquist fCLOCK MSPS; fOUT 1.00 dBFS Output dBFS Output dBFS Output dBFS Output fCLOCK MSPS; fOUT 1.00 fCLOCK MSPS; fOUT 2.51 fCLOCK MSPS; fOUT 5.02 fCLOCK MSPS; fOUT 14.02 fCLOCK MSPS; fOUT fCLOCK MSPS; fOUT fCLOCK MSPS; fOUT Signal Noise Distortion Ratio fCLOCK MHz; fOUT Total Harmonic Distortion fCLOCK MSPS; fOUT 1.00 fCLOCK MSPS; fOUT 2.00 fCLOCK MSPS; fOUT 4.00 fCLOCK MSPS; fOUT 10.00 Multitone Power Ratio (Eight Tones Spacing) fCLOCK MSPS; fOUT 2.00 2.99 dBFS Output dBFS Output dBFS Output dBFS Output Channel Isolation fCLOCK MSPS; fOUT fCLOCK MSPS; fOUT
NOTES Measured single-ended into load. Specifications subject change without notice.
(TMIN TMAX, AVDD DVDD IOUTFS Differential Transformer-Coupled Output, Doubly Terminated, unless otherwise noted)
Unit MSPS pV-s pA/Hz pA/Hz
REV.
AD9709-SPECIFICATIONS
DIGITAL SPECIFICATIONS
Parameter DIGITAL INPUTS Logic Voltage DVDD Logic DVDD Logic Voltage DVDD Logic DVDD Logic Current Logic Current Input Capacitance Input Setup Time (tS) Input Hold Time (tH) Latch Pulsewidth (tLPW, tCPW)
Specifications subject change without notice.
TMAX, AVDD DVDD IOUTFS unless otherwise noted)
Unit
ABSOLUTE MAXIMUM RATINGS*
Parameter AVDD DVDD ACOM AVDD MODE, CLK1, CLK2, WRT1, WRT2 Digital Inputs IOUTA1/IOUTA2, IOUTB1/IOUTB2 REFIO, FSADJ1, FSADJ2 GAINCTRL, SLEEP Junction Temperature Storage Temperature Lead Temperature sec)
With Respect ACOM DCOM DCOM DVDD DCOM DCOM ACOM ACOM ACOM
-0.3 -0.3 -0.3 -6.5 -0.3 -0.3 -1.0 -0.3 -0.3
+6.5 +6.5 +0.3 +6.5 DVDD DVDD AVDD AVDD AVDD +150
Unit
*Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum ratings extended periods affect device reliability.
ORDERING GUIDE
Model AD9709AST AD9709-EB
Temperature Range -40°C +85°C
Package Description
Package Option
DATA
Thin Plastic Quad ST-48 Flatpack (LQFP) Evaluation Board
(WRT2) (WRT1 IQWRT) (CLK2) (CLK1/ IQCLK)
THERMAL CHARACTERISTICS Thermal Resistance
IOUTA IOUTB
48-Lead LQFP 91°C/W
Figure Timing Diagram Dual Interleaved Modes
Dynamic Digital sections timing specifications.
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AD9709 features proprietary protection circuitry, permanent damage occur devices subjected high-energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
AD9709
FUNCTION DESCRIPTIONS
9-14, 31-36 23-30
Name PORT1 DCOM1, DCOM2 DVDD1, DVDD2 WRT1/IQWRT CLK1/IQCLK CLK2/IQRESET WRT2/IQSEL PORT2 SLEEP ACOM IOUTA2, IOUTB2 FSADJ2 GAINCTRL REFIO FSADJ1 IOUTB1, IOUTA1 AVDD MODE
Description Data Bits DB7-P1 DB0-P1 Connection Digital Common Digital Supply Voltage Input Write Signal PORT (IQWRT Interleaving Mode) Clock Input DAC1 (IQCLK Interleaving Mode) Clock Input DAC2 (IQRESET Interleaving Mode) Input Write Signal PORT (IQSEL Interleaving Mode) Data Bits DB7-P2 DB0-P2 Power-Down Control Input Analog Common "PORT Differential Current Outputs Full-Scale Current Output Adjust DAC2 Master/Slave Resistor Control Mode Reference Input/Output Full-Scale Current Output Adjust DAC1 "PORT Differential Current Outputs Analog Supply Voltage Mode Select Dual Port, Interleaved)
CONFIGURATION
GAIN CTRL
FSADJ1
FSADJ2
MODE
DB7-P1(MSB) DB6-P1 DB5-P1 DB4-P1 DB3-P1 DB2-P1 DB1-P1 DB0-P1
REFIO
SLEEP
DB0-P2 DB1-P2 DB2-P2 DB3-P2 DB4-P2 DB5-P2
IOUTA1
IOUTB1
IOUTB2 DCOM2
IOUTA2 DVDD2
IDENTIFIER
AVDD
AD9709
DUAL 8-BIT 48-PIN LQFP
WRT1/IQWRT
CLK1/IQCLK
DCOM1
CLK2/IQRESET
DVDD1
ACOM DB7-P2 (MSB)
CONNECT
REV.
WRT/IQSEL
DB6-P2
AD9709
DEFINITIONS SPECIFICATIONS Linearity Error (Also Called Integral Nonlinearity INL) Temperature Drift
Linearity error defined maximum deviation actual analog output from ideal output, determined straight line drawn from zero full-scale.
Differential Nonlinearity DNL)
Temperature drift specified maximum change from ambient (25°C) value value either TMIN TMAX. offset gain drift, drift reported full-scale range (FSR) degree reference drift, drift reported degree
Power Supply Rejection
measure variation analog value, normalized full-scale, associated with change digital input code.
Monotonicity
converter monotonic output either increases remains constant digital input increases.
Offset Error
maximum change full-scale output supplies varied from nominal minimum maximum specified voltages.
Settling Time
deviation output current from ideal zero called offset error. IOUTA, output expected when inputs IOUTB, output expected when inputs
Gain Error
time required output reach remain within specified error band about final value, measured from start output transition.
Glitch Impulse
difference between actual ideal output span. actual span determined output when inputs minus output when inputs
Output Compliance Range
Asymmetrical switching times give rise undesired output transients that quantified glitch impulse. specified area glitch pV-s.
Spurious-Free Dynamic Range
difference, between amplitude output signal peak spurious signal over specified bandwidth.
Total Harmonic Distortion
range allowable voltage output current-output DAC. Operation beyond maximum compliance limits cause either output stage saturation breakdown resulting nonlinear performance.
AVDD DIVIDER FSADJ1 RSET1 REFIO PMOS CURRENT SOURCE ARRAY CLK1/ IQCLK
ratio first harmonic components value measured input signal. expressed percentage decibels (dB).
CLK2/ IQRESET
SLEEP
AD9709
IOUTA1 SEGMENTED SWITCHES DAC1 SWITCH IOUTB1 IOUTA2
MINI CIRCUITS T1-1T
HP3589A SPECTRUM/ NETWORK ANALYZER
DAC1 LATCH
FSADJ2 RSET2 1.2V
PMOS CURRENT SOURCE ARRAY
DAC2 LATCH
SEGMENTED SWITCHES DAC2
SWITCH
IOUTB2 MODE DVDD
MULTIPLEXING LOGIC CHANNEL LATCH DB0-DB7 DIGITAL DATA TEKTRONIX AWG-2021 w/OPTION CHANNEL LATCH
WRT1/ IQWRT GAINCTRL DVDD DCOM
DCOM ACOM DB0-DB7 WRT2/ IQSEL
RETIMED CLOCK OUTPUT LECROY 9210 PULSE GENERATOR
*AWG2021 CLOCK RETIMED SUCH THAT DIGITAL DATA TRANSITIONS FALLING EDGE DUTY CYCLE CLOCK
Figure Basic Characterization Test Setup AD9709, Testing Port Dual Port Mode, Using Independent GAINCTRL Resistors FSADJ1 FSADJ2
REV.
AD9709 Typical Characterization Curves
(AVDD DVDD IOUTFS otherwise noted)
fCLK 25MSPS
Doubly Terminated Load, Differential Output, SFDR Nyquist, unless
dBFS
SFDR
0dBFS
SFDR
SFDR
fCLK 5MSPS fCLK 65MSPS fCLK 125MSPS
-6dBFS -12dBFS
dBFS dBFS
fOUT
fOUT
fOUT
Figure SFDR fOUT dBFS
Figure SFDR fOUT MSPS
Figure SFDR fOUT MSPS
0dBFS
SFDR
SFDR
0dBFS
SFDR
IOUTFS
IOUTFS 20mA
fOUT -12dBFS -6dBFS
-6dBFS -12dBFS
IOUTFS 10mA
fOUT
fOUT
Figure SFDR fOUT MSPS
Figure SFDR fOUT MSPS
Figure SFDR fOUT IOUTFS MSPS dBFS
SFDR
5MSPS/1.0MHz
SFDR
5MSPS /0.46MHz 10MSPS/0.91MHz
0.965/1.035MHz @7MSPS
25MSPS/2.27MHz 65MSPS/5.91MHz 125MSPS/11.37MHz AOUT dBFS
SFDR
3.3/3.4MHz @25MSPS
10MSPS/2.0MHz 125MSPS/5.0MHz 65MSPS/13.0MHz 25MSPS/5.0MHz AOUT dBFS
16.9/18.1Mz @125MSPS
8.8/9.8MHz @65MSPS AOUT dBFS
Figure Single-Tone SFDR AOUT fOUT fCLOCK/11
Figure Single-Tone SFDR AOUT fOUT fCLOCK/5
Figure Dual-Tone SFDR AOUT fOUT fCLOCK/7
REV.
AD9709
0.06 0.04 0.02
0.07 0.06 0.05
SINAD
LSBs
LSBs
IOUTFS 20mA
-0.02 -0.04 -0.06
0.04 0.03 0.02 0.01
IOUTFS IOUTFS 10mA
-0.08 -0.1 CODE
-0.01 CODE
fCLK MSPS
Figure SINAD fCLOCK IOUTFS fOUT dBFS
Figure Typical
Figure Typical
fOUT 40MHz fOUT 60MHz
0.05
OFFSET ERROR
fOUT 10MHz fOUT 25MHz
GAIN ERROR
GAIN ERROR
AMPLITUDE
0.03 OFFSET ERROR
SFDR
0.00
-0.03
-0.5
TEMPERATURE
-0.05
TEMPERATURE
-1.0
-100
FREQUENCY
Figure SFDR Temperature fCLK MSPS, dBFS
Figure Gain Offset Error Temperature fCLK MSPS
Figure Single-Tone SFDR fCLK MSPS
AMPLITUDE
AMPLITUDE
FREQUENCY
FREQUENCY
Figure Dual-Tone SFDR fCLK MSPS
Figure Four-Tone SFDR fCLK MSPS
REV.
AD9709
FUNCTIONAL DESCRIPTION REFERENCE OPERATION
Figure shows simplified block diagram AD9709. AD9709 consists DACs, each with independent digital control logic full-scale output current control. Each contains PMOS current source array capable providing full-scale current (IOUTFS). array divided into equal currents that make five most significant bits (MSBs). three lower bits consist seven equal current sources whose value 1/8th current source. Implementing lower bits with current sources, instead R-2R ladder, enhances dynamic performance multitone low-amplitude signals helps maintain DACs high-output impedance (i.e., >100 these current sources switched other output nodes (i.e., IOUTA IOUTB) PMOS differential current switches. switches based architecture that drastically improves distortion performance. This switch architecture reduces various timing errors provides matching complementary drive signals inputs differential current switches. analog digital sections AD9709 have separate power supply inputs (i.e., AVDD DVDD) that operate independently over range. digital section, which capable operating MSPS clock rate, consists edge-triggered latches segment decoding logic circuitry. analog section includes PMOS current sources, associated differential switches, 1.20 bandgap voltage reference reference control amplifiers. full-scale output current each regulated separate reference control amplifiers from external resistor, RSET, connected Full-Scale Adjust (FSADJ) pin. external resistor, combination with both reference control amplifier voltage reference VREFIO, sets reference current IREF, which replicated segmented current sources with proper scaling factor. fullscale current, IOUTFS, IREF.
AVDD DIVIDER FSADJ1 RSET1 IREF1 REFIO PMOS CURRENT SOURCE ARRAY CLK1/ IQCLK
AD9709 contains internal 1.20 bandgap reference. This easily overridden external reference with effect performance. REFIO serves either input output depending whether internal external reference used. internal reference, simply decouple REFIO ACOM with capacitor. internal reference voltage will present REFIO. voltage REFIO used elsewhere circuit, external buffer amplifier with input bias current less than should used. example internal reference shown Figure external reference applied REFIO shown Figure external reference provide either fixed reference voltage enhance accuracy drift performance varying reference voltage gain control. Note that compensation capacitor required since internal reference overridden, relatively high-input impedance REFIO minimizes loading external reference.
GAINCTRL MODE
AD9709 allows gain each channel independently connecting RSET resistor FSADJ1 another RSET resistor FSADJ2. flexibility reduce system cost, single RSET resistor used gain both channels simultaneously. When GAINCTRL (i.e., connected AGND), independent channel gain control mode using resistors enabled. this mode, individual RSET resistors should connected FSADJ1 FSADJ2. When GAINCTRL high (i.e., connected AVDD), master/slave channel gain control mode using resistor enabled. this mode, single RSET resistor connected FSADJ1 resistor FSADJ2 removed.
CLK2/ IQRESET SLEEP
AD9709
IOUTA1 SEGMENTED SWITCHES DAC1 SWITCH
VDIFF VOUTA VOUTB VOUT1A RL1A
DAC1 LATCH
IOUTB1 IOUTA2 VOUT2A VOUT2B RL2B
VOUT1B RL1B
FSADJ2 RSET2 IREF2
PMOS CURRENT SOURCE ARRAY 1.2V
DAC2 LATCH
SEGMENTED SWITCHES DAC2
SWITCH
IOUTB2
RL2A
MULTIPLEXING LOGIC CHANNEL LATCH GAINCTRL WRT1/ IQWRT CHANNEL LATCH
DVDD ACOM DCOM
DB0-DB7 DB0-DB7 DIGITAL DATA INPUTS
WRT2/ MODE IQSEL
Figure Simplified Block Diagram
REV.
AD9709
REFERENCE CONTROL AMPLIFIER
Both DACs AD9709 contain control amplifier that used regulate full-scale output current, IOUTFS. control amplifier configured converter shown Figure that current output, IREF, determined ratio VREFIO external resistor, RSET, stated Equation IREF copied segmented current sources with proper scale factor IOUTFS stated Equation
OPTIONAL EXTERNAL REFERENCE BUFFER GAINCTRL +1.2V REFIO IREF FSADJ AVDD
current outputs will typically drive resistive load directly transformer. coupling required, IOUTA IOUTB should directly connected matching resistive loads, RLOAD, that tied analog common, ACOM. Note, RLOAD represent equivalent load resistance seen IOUTA IOUTB would case doubly terminated cable. single-ended voltage output appearing IOUTA IOUTB nodes simply VOUTA IOUTA RLOAD VOUTB IOUTB RLOAD
AD9709
REFERENCE SECTION
CURRENT SOURCE ARRAY ACOM
ADDITIONAL EXTERNAL LOAD
Note full-scale value VOUTA VOUTB should exceed specified output compliance range maintain specified distortion linearity performance. VDIFF (IOUTA IOUTB) RLOAD Substituting values IOUTA, IOUTB IREF; VDIFF expressed VDIFF CODE 255)/256} RLOAD/RSET) VREFIO
Figure Internal Reference Configuration
GAINCTRL AVDD +1.2V REFIO FSADJ IREF
AVDD
AD9709
REFERENCE SECTION
CURRENT SOURCE ARRAY ACOM
EXTERNAL REFERENCE
These last equations highlight some advantages operating AD9709 differentially. First, differential operation will help cancel common-mode error sources associated with IOUTA IOUTB such noise, distortion offsets. Second, differential code dependent current subsequent voltage, VDIFF, twice value single-ended voltage output (i.e., VOUTA VOUTB), thus providing twice signal power load. Note, gain drift temperature performance single-ended (VOUTA VOUTB) differential output (VDIFF) AD9709 enhanced selecting temperature tracking resistors RLOAD RSET their ratiometric relationship shown Equation
ANALOG OUTPUTS
Figure External Reference Configuration
control amplifier allows wide (10:1) adjustment span IOUTFS from setting IREF between 62.5 wide adjustment range IOUTFS provides several benefits. first relates directly power dissipation AD9709, which proportional IOUTFS (refer Power Dissipation section). second relates adjustment, which useful system gain control purposes. small signal bandwidth reference control amplifier approximately used frequency, small signal multiplying applications.
TRANSFER FUNCTION
Both DACs AD9709 provide complementary current outputs, IOUTA IOUTB. IOUTA will provide near full-scale current output, IOUTFS, when bits high (i.e., CODE 1023) while IOUTB, complementary output, provides current. current output appearing IOUTA IOUTB function both input code IOUTFS expressed IOUTA (DAC CODE/256) IOUTFS IOUTB (255 CODE)/256 IOUTFS
complementary current outputs each DAC, IOUTA IOUTB, configured single-ended differential operation. IOUTA IOUTB converted into complementary single-ended voltage outputs, VOUTA VOUTB, load resistor, RLOAD, described Transfer Function section Equations through differential voltage, VDIFF, existing between VOUTA VOUTB also converted single-ended voltage transformer differential amplifier configuration. performance AD9709 optimum specified using differential transformer coupled output which voltage swing IOUTA IOUTB limited single-ended unipolar output desirable, IOUTA should selected. distortion noise performance AD9709 enhanced when configured differential operation. common-mode error sources both IOUTA IOUTB significantly reduced common-mode rejection transformer differential amplifier. These common-mode error sources include even-order distortion products noise. enhancement distortion performance becomes more significant frequency content reconstructed waveform increases. This first order cancellation various dynamic common-mode distortion mechanisms, digital feedthrough noise.
where CODE (i.e., Decimal Representation). mentioned previously, IOUTFS function reference current IREF, which nominally reference voltage, VREFIO external resistor RSET. expressed IOUTFS IREF where IREF VREFIO /RSET
-10-
REV.
AD9709
Performing differential-to-single-ended conversion transformer also provides ability deliver twice reconstructed signal power load (i.e., assuming source termination). Since output currents IOUTA IOUTB complementary, they become additive when processed differentially. properly selected transformer will allow AD9709 provide required power voltage levels different loads. output impedance IOUTA IOUTB determined equivalent parallel combination PMOS switches associated with current sources typically parallel with also slightly dependent output voltage (i.e., VOUTA VOUTB) nature PMOS device. result, maintaining IOUTA and/or IOUTB virtual ground configuration will result optimum linearity. Note INL/DNL specifications AD9709 measured with IOUTA maintained virtual ground amp. IOUTA IOUTB also have negative positive voltage compliance range that must adhered order achieve optimum performance. negative output compliance range -1.0 breakdown limits CMOS process. Operation beyond this maximum limit result breakdown output stage affect reliability AD9709. positive output compliance range slightly dependent full-scale output current, IOUTFS. degrades slightly from nominal 1.25 IOUTFS 1.00 IOUTFS optimum distortion performance single-ended differential output achieved when maximum full-scale signal IOUTA IOUTB does exceed Applications requiring AD9709's output (i.e., VOUTA and/or VOUTB) extend output compliance range should size RLOAD accordingly. Operation beyond this compliance range will adversely affect AD9709's linearity performance subsequently degrade distortion performance.
DIGITAL INPUTS TIMING
AD9709 operate timing modes, dual interleaved, which described below. block diagram Figure represents latch architecture interleaved timing mode.
DUAL PORT MODE TIMING
When mode Logic AD9709 operates dual port mode. AD9709 functions distinct DACs. Each completely independent digital input control lines. AD9709 features double buffered data path. Data enters device through channel input latches. This data then transferred latch each signal path. Once data loaded into latch, analog output will settle value. general consideration, lines control channel input latches lines control latches. Both sets latches updated rising edge their respective control signals. rising edge should occur before simultaneously with rising edge WRT. Should rising edge occur after rising edge WRT, minimum delay should maintained from rising edge rising edge CLK.
DATA
WRT1/WRT2 CLK1/CLK2
IOUTA IOUTB
Figure Dual Mode Timing
AD9709's digital inputs consists independent channels. dual port mode, each dedicated 8-bit data port, line line. interleaved timing mode, function digital control pins changes described below under Interleaved Mode Timing section. 8-bit parallel data inputs follow straight binary coding where most significant (MSB) least significant (LSB). IOUTA produces full-scale output current when data bits Logic IOUTB produces complementary output with full-scale current split between outputs function input code. digital interface implemented using edge-triggered master slave latch. outputs updated following either rising edge, every other rising edge clock, depending whether dual interleaved mode being used. outputs designed support clock rate high MSPS. clock operated duty cycle that meets specified latch pulsewidth. setup hold times also varied within clock cycle long specified minimum times met, although location these transition edges affect digital feedthrough distortion performance. Best performance typically achieved when input data transitions falling edge duty cycle clock.
Timing specifications dual port mode given Figures
DATAIN
WRT1/WRT2
CLK1/CLK2
IOUTA IOUTB
Figure Dual Mode Timing
INTERLEAVED MODE TIMING
When mode Logic AD9709 operates interleaved mode. WRT1 functions IQWRT CLK1 functions IQCLK. WRT2 functions IQSEL CLK2 functions IQRESET. Data enters device rising edge IQWRT. logic level IQSEL will steer data either Channel Latch (IQSEL Channel Latch (IQSEL Note: proper operation, IQSEL should only change state when IQWRT IQCLK low. -11-
REV.
AD9709
When IQRESET high, IQCLK disabled. When IQRESET goes low, following rising edge IQCLK will update both latches with data present their inputs. interleaved mode IQCLK divided internally. Following this first rising edge, latches will only updated every other rising edge IQCLK. this way, IQRESET used synchronize routing data DACs. with dual port mode, IQCLK should occur before simultaneously with IQWRT.
INTERLEAVED DATA PORT PORT INPUT LATCH DAC1 LATCH DAC1 IQWRT IQSEL PORT INPUT LATCH IQCLK IQRESET DEINTERLEAVED DATA DAC2 LATCH DAC2
digital inputs CMOS-compatible with logic thresholds, VTHRESHOLD, approximately half digital positive supply (DVDD) VTHRESHOLD DVDD/2 20%) internal digital circuitry AD9709 capable operating over digital supply range result, digital inputs also accommodate levels when DVDD accommodate maximum high-level voltage drivers VOH(MAX). DVDD will typically ensure proper compatibility with most logic families. Figure shows equivalent digital input circuit data clock inputs. sleep mode input similar with exception that contains active pull-down circuit, thus ensuring that AD9709 remains enabled this input left disconnected. Since AD9709 capable being clocked MSPS, quality clock data input signals important achieving optimum performance. Operating AD9709 with reduced logic swings corresponding digital supply (DVDD) will result lowest data feedthrough on-chip digital noise. drivers digital data interface circuitry should specified meet minimum setup hold times AD9709 well required min/max input logic level thresholds. Digital signal paths should kept short lengths matched avoid propagation delay mismatch. insertion lowvalue resistor network (i.e., between AD9709 digital inputs driver outputs helpful reducing overshooting ringing digital inputs that contribute digital feedthrough. longer board traces high-data update rates, stripline techniques with proper impedance termination resistors should considered maintain "clean" digital inputs. external clock driver circuitry should provide AD9709 with low-jitter clock input meeting min/max logic levels while providing fast edges. Fast clock edges will help minimize jitter that will manifest itself phase noise reconstructed waveform. Thus, clock input should driven fastest logic family suitable application.
DVDD
Figure Latch Structure Interleaved Mode
Timing specifications interleaved mode given Figures
DATA
IQSEL
IQWRT
IQCLK IOUTA IOUTB
*APPLIES FALLING EDGE IQCLK /IQWRT IQSEL ONLY
Figure Interleaved Mode Timing
INTERLEAVED DATA IQSEL
DIGITAL INPUT
IQWRT
IQCLK
Figure Equivalent Digital Input
IQRESET OUTPUT PORT OUTPUT PORT
Figure Interleaved Mode Timing
Note that clock input could also driven sine wave, which centered around digital threshold (i.e., DVDD/2) meets min/max logic threshold. This will typically result slight degradation phase noise, which becomes more noticeable higher sampling rates output frequencies. Also, higher sampling rates, tolerance digital logic threshold should considered since will affect effective clock duty cycle and, subsequently, into required data setup hold times.
-12-
REV.
AD9709
SINAD
optimum dynamic performance, differential output configuration suggested. differential output configuration consist either transformer differential configuration. transformer configuration provides optimum high-frequency performance recommended application allowing coupling. differential configuration suitable applications requiring coupling, bipolar output, signal gain and/or level shifting, within bandwidth chosen amp.
IAVDD
TIME DATA CHANGE RELATIVE RISING CLOCK EDGE
IOUTFS
Figure SINAD Clock Placement fOUT
INPUT CLOCK DATA TIMING RELATIONSHIP
dependent relationship between position clock edges point time which input data changes. AD9709 rising edge triggered, exhibits sensitivity when data transition close this edge. general, goal when applying AD9709 make data transition close falling clock edge. This becomes more important sample rate increases. Figure shows relationship clock/data placement.
SLEEP MODE OPERATION
Figure IAVDD IOUTFS
125MSPS 100MSPS
IDVDD
AD9709 power down function that turns output current reduces supply current less than over specified supply range temperature range. This mode activated applying logic level SLEEP pin. SLEEP logic threshold equal AVDD. This digital input also contains active pull-down circuit that ensures AD9709 remains enabled this input left disconnected. AD9709 takes less than power down approximately power back
POWER DISSIPATION
65MSPS
25MSPS 5MSPS
power dissipation, AD9709 dependent several factors that include: power supply voltages (AVDD DVDD), full-scale current output IOUTFS, update rate fCLOCK, reconstructed digital input waveform. power dissipation directly proportional analog supply current, IAVDD, digital supply current, IDVDD. IAVDD directly proportional IOUTFS shown Figure insensitive fCLOCK. Conversely, IDVDD dependent both digital input waveform, fCLOCK, digital supply DVDD. Figures show IDVDD function full-scale sine wave output ratios (fOUT/fCLOCK) various update rates with DVDD DVDD respectively. Note IDVDD reduced more than factor when DVDD reduced from
APPLYING AD9709 Output Configurations
IDVDD
RATIO fOUT /fCLK
Figure IDVDD Ratio DVDD
125MSPS 65MSPS 25MSPS 5MSPS 100MSPS
following sections illustrate some typical output configurations AD9709. Unless otherwise noted, assumed that IOUTFS nominal applications requiring REV. -13-
RATIO fOUT /fCLK
Figure IDVDD Ratio DVDD
AD9709
single-ended output suitable applications requiring unipolar voltage output. positive unipolar output voltage will result IOUTA and/or IOUTB connected appropriately sized load resistor, RLOAD, referred ACOM. This configuration more suitable single-supply system requiring dccoupled, ground referred output voltage. Alternatively, amplifier could configured converter, thus converting IOUTA IOUTB into negative unipolar voltage. This configuration provides best linearity since IOUTA IOUTB maintained virtual ground. Note that IOUTA provides slightly better performance than IOUTB.
DIFFERENTIAL COUPLING USING TRANSFORMER
some additional signal gain. must operate dual supply since output approximately highspeed amplifier capable preserving differential performance AD9709 while meeting other system level objectives (i.e., cost, power) should selected. amp's differential gain, gain setting resistor values, full-scale output swing capabilities should considered when optimizing this circuit. differential circuit shown Figure provides necessary level-shifting required single supply system. this case, AVDD which positive analog supply both AD9709 also used level-shift differential output AD9709 midsupply (i.e., AVDD/2). AD8041 suitable this application.
SINGLE-ENDED UNBUFFERED VOLTAGE OUTPUT
transformer used perform differential-tosingle-ended signal conversion shown Figure differentially coupled transformer output provides optimum distortion performance output signals whose spectral content lies within transformer's passband. transformer such Mini-Circuits T1-1T provides excellent rejection common-mode distortion (i.e., even-order harmonics) noise over wide frequency range. also provides electrical isolation ability deliver twice power load. Transformers with different impedance ratios also used impedance matching purposes. Note that transformer provides coupling only.
MINI-CIRCUITS T1-1T RLOAD
IOUTA
Figure shows AD9709 configured provide unipolar output range approximately doubly terminated cable since nominal full-scale current, IOUTFS, flows through equivalent RLOAD this case, RLOAD represents equivalent load resistance seen IOUTA IOUTB. unused output (IOUTA IOUTB) connected ACOM directly matching RLOAD. Different values IOUTFS RLOAD selected long positive compliance range adhered additional consideration this mode integral nonlinearity (INL) discussed Analog Output section this data sheet. optimum performance, single-ended, buffered voltage output configuration suggested.
AD9709
IOUTB
OPTIONAL RDIFF
AD9709
IOUTA
Figure Differential Output Using Transformer
IOUTB COPT
AD8047
center primary side transformer must connected ACOM provide necessary current path both IOUTA IOUTB. complementary voltages appearing IOUTA IOUTB (i.e., VOUTA VOUTB) swing symmetrically around ACOM should maintained with specified output compliance range AD9709. differential resistor, RDIFF, inserted applications where output transformer connected load, RLOAD passive reconstruction filter cable. RDIFF determined transformer's impedance ratio provides proper source termination that results VSWR. Note that approximately half signal power will dissipated across RDIFF.
DIFFERENTIAL COUPLING USING
Figure Differential Coupling Using
AD9709
IOUTA
IOUTB COPT
AD8041
AVDD
also used perform differential singleended conversion shown Figure AD9709 configured with equal load resistors, RLOAD, differential voltage developed across IOUTA IOUTB converted single-ended signal differential configuration. optional capacitor installed across IOUTA IOUTB, forming real pole low-pass filter. addition this capacitor also enhances amps distortion performance preventing DACs high-slewing output from overloading amp's input. common-mode rejection this configuration typically determined resistor matching. this circuit, differential circuit using AD8047 configured provide -14-
Figure Single Supply Differential Coupled Circuit
AD9709
IOUTA IOUTB
Figure Unbuffered Voltage Output
REV.
AD9709
SINGLE-ENDED, BUFFERED VOLTAGE OUTPUT CONFIGURATION
Figure shows buffered single-ended output configuration which performs conversion AD9709 output current. maintains IOUTA IOUTB) virtual ground, thus minimizing nonlinear output impedance effect DAC's performance discussed Analog Output section. Although this single-ended configuration typically provides best linearity performance, distortion performance higher update rates limited U1's slewing capabilities. provides negative unipolar output voltage full-scale output voltage simply product IOUTFS. full-scale output should within U1's voltage output swing capabilities scaling IOUTFS and/or RFB. improvement distortion performance result with reduced IOUTFS since signal current will required sink will subsequently reduced.
variations power supply, resulting performance directly corresponds gain error associated with DAC's full-scale current, IOUTFS. noise supplies common applications where power distribution generated switching power supply. Typically, switching power supply noise will occur over spectrum from tens several MHz. PSRR frequency AD9709 AVDD supply over this frequency range shown Figure Note that units Figure given units (amps out/ volts in). Noise analog power supply effect modulating internal current sources, therefore output current. voltage noise AVDD, therefore, will added nonlinear manner desired IOUT. PSRR very code dependent, thus producing mixing effects which modulate low-frequency power supply noise higher frequencies. Worst case PSRR either differential outputs will occur when full-scale current directed towards that output. result, PSRR measurement Figure represents worst-case condition which digital inputs remain static full-scale output current directed output being measured. example serves illustrate effect supply noise analog supply. Suppose switching regulator with switching frequency produces noise simplicity sake (i.e., ignore harmonics), this noise concentrated kHz. calculate much this undesired noise will appear current noise superimposed dc's full-scale current, IOUTFS, must determine PSRR using Figure kHz. calculate PSRR given RLOAD, such that units PSRR converted from V/V, adjust curve Figure scaling factor (RLOAD instance, RLOAD PSRR reduced (i.e., PSRR which Figure becomes VOUT/VIN). Proper grounding decoupling should primary objective high-speed, high-resolution system. AD9709 features separate analog digital supply ground pins optimize management analog digital ground currents system. general, AVDD, analog supply, should decoupled ACOM, analog common, close chip physically possible. Similarly, DVDD, digital supply, should decoupled DCOM close chip physically possible.
AD9709
IOUTA
IOUTB VOUT IOUTFS
Figure Unipolar Buffered Voltage Output
PSRR
FREQUENCY
FERRITE BEADS TTL/CMOS LOGIC CIRCUITS
ELECTROLYTIC
CERAMIC AVDD
Figure AVDD Power Supply Rejection Ratio
POWER GROUNDING CONSIDERATIONS, POWER SUPPLY REJECTION
F-22
ACOM
TANTALUM POWER SUPPLY
Many applications seek high-speed high-performance under less than ideal operating conditions. these application circuits, implementation construction printed circuit board important circuit design. Proper techniques must used device selection, placement routing well power supply bypassing grounding ensure optimum performance. factor that measurably affect system performance ability output reject variations noise superimposed analog digital power distribution. This referred Power Supply Rejection Ratio. REV.
Figure Differential Filter Single Applications
those applications that require single supply both analog digital supplies, clean analog supply generated using circuit shown Figure circuit consists differential filter with separate power supply return lines. Lower noise attained using low-ESR type electrolytic tantalum capacitors.
-15-
AD9709
APPLICATIONS Using AD9709 Quadrature Amplitude Modulation
most widely used digital modulation schemes digital communications systems. This modulation technique found well spread spectrum (i.e., CDMA) based systems. signal carrier frequency that modulated both amplitude (i.e., modulation) phase (i.e., modulation). generated independently modulating carriers identical frequency with phase difference. This results in-phase carrier component quadrature carrier component phase shift with respect component. components then summed provide signal specified carrier frequency.
ASIC NYQUIST FILTERS QUADRATURE MODULATOR CARRIER FREQUENCY
implementation complexity analog filter, which significant contributor mismatches gain phase between baseband channels. quadrature mixer modulates components with in-phase quadrature carrier frequency then sums outputs provide signal. this implementation, much more difficult maintain proper gain phase matching between channels. circuit implementation shown Figure helps improve upon matching between channels, well showing path up-conversion using AD8346 quadrature modulator. AD9709 provides both DACs well common reference that will improve gain matching stability. RCAL used compensate mismatch gain between channels. mismatch attributed mismatch between RSET1 RSET2, effective load resistance each channel, and/or voltage offset control amplifier each DAC. differential voltage outputs both DACs AD9709 into respective differential inputs AD8346 matching networks. digital data into AD9709 different ways. dual port mode, digital information drives input port, while digital information drives other input port. interpolation filter precedes DAC, symbol rate will rate which system clock drives pins AD9709. interleaved mode, digital input stream Port contains information alternating digital words. Using IQSEL IQRESET, AD9709 synchronized data stream. internal timing AD9709 routes selected data correct output. interleaved mode, interpolation filter precedes AD9709, symbol rate will half that system clock driving digital datastream IQWRT IQCLK pins AD9709.
MIXER
Figure Typical Analog Architecture
common traditional implementation modulator shown Figure modulation performed analog domain which DACs used generate baseband components. Each component then typically applied Nyquist filter before being applied quadrature mixer. matching Nyquist filters shape limit each components spectral envelope while minimizing intersymbol interference. typically updated symbol rate possibly multiple interpolating filter precedes DAC. interpolating filter typically eases
AVDD DCOM DVDD ACOM AVDD IOUTA IOUTB BBIN LOIP BBIP VPBF VOUT
ROHDE SCHWARZ FSEA30B SPECTRUM ANALYZER
TEKTRONICS AWG2021 W/OPTION
IQWRT IQCLK
PORT
LATCH
AD9709
QOUTA QOUTB FSADJI FSADJQ REFIO CFILTER BBQN
VDIFF 1.82V
PHASE SPLITTER
BBQP LOIN
PORT IQSEL SLEEP MODE
LATCH
AD8346
ROHDE SCHWARZ SIGNAL GENERATOR
RSET 3.9k
RSET 3.9k
DIFFERENTIAL FILTER
AVDD
NOTE: DACs Full-Scale OUTPUT CURRENT IOUTFS THIN FILM RESISTOR NETWORKSWITH 0.1% MATCHING, ACCURACY. AVAILABLE FROM OHMTEK ORNXXXXD SERIES.
NOTE: 2500 280pF
45pF IOUTFS 11mA AVDD 5.0V 1.2V
AD976x
IOUTFS
AD8346
VMOD
VDAC
Figure Baseband Implementation Using AD9709 AD8346
-16-
REV.
AD9709
CDMA
Carrier Division Multiple Access, CDMA, transmit/ receive scheme where signal transmit path modulated with pseudorandom digital code (sometimes referred spreading code). effect this spread transmitted signal across wide spectrum. Similar waveform, CDMA waveform containing multiple subscribers characterized having high peak average ratio (i.e., crest factor), thus demanding highly linear components transmit signal path. bandwidth spectrum defined CDMA standard being used, operation implemented using spreading code with particular characteristics. Distortion transmit path lead power being transmitted defined band. ratio power transmitted in-band out-of-band often referred Adjacent Channel Power (ACP). This regulatory issue possibility interference with other signals being transmitted air. Regulatory bodies define spectral mask outside transmit band, must fall under this mask. distortion transmit path causes above spectral mask, then filtering, different component selection needed meet mask requirements. Figure shows AD9709/AD8346 application circuit Figure reconstructing wideband, W-CDMA test vector with bandwith MHz, centered being sampled 62.5 MHz. frequency output 15.625 MHz. ACPR given test vector measured greater than
-100 -110 -120 -130 CENTER 2.4GHz
3MHz FREQUENCY
SPAN 30MHz
Figure CDMA Signal, Chips Sampled MSPS, Recreated GHz, Adjacent Channel Power
Figure shows example AD9709 used W-CDMA transmitter application using AD6122 CDMA subsystem. AD6122 functions, such external gain control low-distortion characteristics, needed superior Adjacent Channel Power (ACP) requirements W-CDMA.
DVDD CLK1 RSET1
AVDD
AD9709
DAC")
FSADJ1
LATCH
IOUTA
IIPP IIPN
AD6122
DATA INPUT WRT1 WRT2 DATA INPUT RSET2 1.9k
INPUT LATCHES
IOUTB
LOIPP LOIPN IIQP IIQN MODOPN PHASE SPLITTER
INPUT LATCHES
LATCH
QOUTA
MODOPP
FSADJ2 RCAL
QOUTB SLEEP CLK2 ACOM DCOM
DAC")
REFIO
TEMPERATURE COMPENSATION REFIN GAIN CONTROL VGAIN GAIN CONTROL SCALE FACTOR
TXOPP TXOPN
Figure CDMA Transmit Application Using AD9709 AD6122
REV.
-17-
AD9709
EVALUATION BOARD General Description
AD9709-EB evaluation board AD9709 8-bit dual converter. Careful attention layout circuit design, combined with prototyping area, allow user easily effectively evaluate AD9709 application where high resolution, high speed conversion required. This board allows user flexibility operate AD9709
various configurations. Possible output configurations include transformer coupled, resistor terminated, single differential outputs. digital inputs used dual port interleaved mode, designed driven from various word generators, with on-board option resistor network proper load termination. When operating AD9709, best performance obtained when running Digital Supply (DVDD) Analog Supply (AVDD)
POWER DECOUPLING INPUT CLOCKS
DVDDIN BAN-JACK BAN-JACK TP10 BEAD DVDD TP37
AVDDIN TP39
TP11 BEAD
DVDD AVDD TP40 TP41 TP42
0.01
TP38
BAN-JACK BAN-JACK
TP43
DGND
TP44
AGND
DCLKIN1 TP29
DGND;3,4,5
DCLKIN2 DVDD
WRT1IN IQWRT
JP16
CLK1IN IQCLK
TP30
DGND;3,4,5
DVDD
CLK2IN RESET
TP31
DGND;3,4,5
TSSOP112
TSSOP112
DGND;8 DVDD;16
DGND;8 DVDD;16
DVDD
WRT2IN IQSEL
TP32
DGND;3,4,5
CLOCK DIVIDER
WRT1 CLK1 CLK2 WRT2 SLEEP
TP33 SLEEP
RP16 RCOM
RCOM
INP1
INP2
INP3
INP4
INP5
INP6
INP7
INP8 RP10
INP9 INP10 INP11 INP12 INP13 INP14
INCK1 RP15
RCOM
RCOM
INP23 INP24 INP25 INP26 INP27 INP28 INP29 INP30
INP31 INP32 INP33 INP34 INP35 INP36
INCK2
Figure Power Decoupling Clocks AD9709 Evaluation Board
-18-
REV.
AD9709
DIGITAL INPUT SIGNAL CONDITIONING
RCOM
RCOM
RP13
RCOM
RP11
RCOM
INP1 INP2 INP3 INP4 INP5 INP6 INP7 INP8 INP9 INP10 INP11 INP12 INP13 INP14
RP5,
DVDD RP5,
DVDD DUTP1 DUTP2 DUTP3 DUTP4 DUTP5 DUTP6 DUTP7 DUTP8 DUTP9 DUTP10 DUTP11 DUTP12 DUTP13 DUTP14
RP5,
RP5,
RP5,
RP5,
RP5,
RP5,
RP6,
RP6,
RP6,
RP6,
RP6,
RP6,
INCK1
RP6,
DCLKIN1
RCOM
RCOM
RP14
RCOM
RP12
RCOM
INP23 INP24 INP25 INP26 INP27 INP28 INP29 INP30 INP31 INP32 INP33 INP34 INP35 INP36
RP7,
DVDD RP7,
DVDD DUTP23 DUTP24 DUTP25 DUTP26 DUTP27 DUTP28 DUTP29 DUTP30 DUTP31 DUTP32 DUTP33 DUTP34 DUTP35 DUTP36
RP7,
RP7,
RP7,
RP7,
RP7,
RP7,
RP8,
RP8,
RP8,
RP8,
RP8,
RP8,
INCK2
RP8,
DCLKIN2 SPARES RP5,
RP8,
Figure Digital Input Signal Conditioning
REV.
-19-
AD9709
ANALOG OUTPUT SIGNAL CONDITIONING
TP34 DVDD
ACOM
JP15
AGND;3,4,5
0.01
OUT1
AVDD
MODE
DVDD DUTP1 DUTP2 DUTP3 DUTP4 DUTP5 DUTP6 DUTP7 DUTP8 DUTP9 DUTP10 DUTP11 DUTP12 DUTP13 DUTP14
10pF
DB13P1MSB DB12P1 DB11P1 DB10P1 DB9P1 DB8P1 DB7P1 DB6P1 DB5P1 DB4P1 DB3P1 DB2P1 DB1P1 DB0P1 DCOM1 DVDD1 WRT1 CLK1 CLK2 WRT2 DCOM2 DVDD2 DB13P2MSB DB12P2
MODE AVDD FSADJ1 REFIO GAINCTRL FSADJ2
10pF
TP45
1.92k
22nF
REFIO TP36
22nF
1.92k 10pF
JP10
ACOM SLEEP DB0P2 DB1P2 DB2P2 DB3P2 DB4P2 DB5P2 DB6P2 DB7P2 DB8P2 DB9P2 DB10P2 DB11P2 SLEEP DUTP36 DUTP35 DUTP34 DUTP33 DUTP32 DUTP31 DUTP30 DUTP29 DUTP28 DUTP27 DUTP26 DUTP25 AVDD
10pF
TP46
TP35
AGND;3,4,5
OUT2
WRT1 CLK1 CLK2 WRT2
DUTP23 DUTP24
0.01
Figure AD9709 Output Signal Conditioning
-20-
REV.
AD9709
Figure Assembly, Side
REV.
-21-
AD9709
Figure Assembly, Bottom Side
-22-
REV.
AD9709
Figure Layer Side
REV.
-23-
AD9709
Figure Layer Ground Plane
-24-
REV.
AD9709
Figure Layer Power Plane
REV.
-25-
AD9709
Figure Layer Bottom Side
-26-
REV.
AD9709
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
48-Lead Thin Plastic Quad Flatpack (LQFP) (ST-48)
0.063 (1.60) 0.030 (0.75) 0.018 (0.45)
0.354 (9.00)
VIEW
(PINS DOWN)
0.276 (7.00)
COPLANARITY 0.003 (0.08) 0.008 (0.2) 0.004 (0.09)
0.019 (0.5)
0.011 (0.27) 0.006 (0.17) 0.057 (1.45) 0.053 (1.35)
0.006 (0.15) SEATING 0.002 (0.05) PLANE
REV.
-27-
PRINTED U.S.A.
C3701-8-5/00 (rev. 00606
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