Differential Input Output Differential Input Differential Output Noise
|
|
|
Top Searches for this datasheet
Digitally Controlled 700MHz Preliminary Technical Data AD8370
Differential Input Output Differential Input Differential Output Noise Figure Maximum Gain Tone 31dBm 70MHz -3dB Bandwidth 700MHz 40dB Precision Gain Range Serial 7-bit Interface Programmable High Gain Range 17dB High Range 34dB Wide Input Dynamic Range Operation Down Supply Power Down Feature APPLICATIONS Differential Driver Sampling Receivers Cellular/PCS Base Stations RF/IF Gain Stages Filter Interfacing Single-Ended Differential Conversion
GENERAL DESCRIPTION AD8370 cost, digitally controlled, variable gain amplifier that provides both high noise figure. excellent distortion performance wide bandwidth makes AD8370 suitable gain control device modern receiver designs. wide input dynamic range applications AD8370 provides input ranges; high-gain low-gain mode. vernier 7-bit attenuator provides 28dB attenuation range with better than resolution, 22dB range with better than resolution. input gain selection allows additional 17dB range
provides excellent output distortion levels with relatively high input levels. AD8370 powered applying appropriate logic level PWUP pin. When powered down AD8370 consumes less than offers excellent input output isolation. Fabricated ADI's high speed XFCB process, high bandwidth AD8370 provides high frequency distortion. quiescent current AD8370 78mA typically. AD8370 amplifier comes compact TSSOP package will operate over temperature range -40°C +85°C.
REV. 3/12/03 Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective companies. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 Fax: 781/326-8703 www.analog.com 2003 Analog Devices, Inc. rights reserved.
AD8370
Parameter DYNAMIC PERFORMANCE Bandwidth Bandwidth Flatness INPUT STAGE Maximum Input Maximum Input Input Resistance Input Capacitance Common Mode Input Range CMRR GAIN CONTROL INTERFACE (GAIN) High Gain High Gain Gain Gain Step Response OUTPUT STAGE Output Voltage Swing
Preliminary Technical Dat(VS=5V, T=25°C, RS=200, gain unless otherwise noted)
AD8370-SPECIFICATIONS
Conditions
1.13
Units Vrms mVrms Vp-p
Vout<1 Vp-p Vout<1 Vp-p Gain (1dB Compression) High Gain (1dB Compression) Differential, f=10MHz Differential, f=10MHz Differential, f=10MHz
Gain Code Gain Code Gain Code Gain Code Gain Step (1dB Compression) Differential, f=10MHz Differential, f=10MHz
34.1 17.1 -11.0
Vp-p
Output Resistance Output Capacitance NOISE/HARMONIC PERFORMANCE 10MHz Noise Figure Harmonic Harmonic Two-Tone Output Compression Point 70MHz Noise Figure Harmonic Harmonic Two-Tone Output Compression Point 140MHz Noise Figure Harmonic Harmonic Two-Tone Output Compression Point
Vout 1Vp-p, Vout 1Vp-p, 1Vp-p Composite
15.8
Vout 1Vp-p, Vout 1Vp-p, 1Vp-p Composite
15.8
Vout 1Vp-p, Vout 1Vp-p, 1Vp-p Composite
14.8
Rev. 3/12/03
Preliminary Technical DatAD8370-SPECIFICATIONS
Parameter NOISE/HARMONIC PERFORMANCE 190MHz Noise Figure Harmonic Harmonic Two-Tone Output Compression Point 240MHz Noise Figure Harmonic Harmonic Two-Tone Output Compression Point 380MHz Noise Figure Harmonic Harmonic Two-Tone Output Compression Point POWER INTERFACE Supply Voltage Quiescent Current Temperature Total Supply Current Power Down Current Temperature POWER DOWN INTERFACE Power Threshold PWUP Input Bias Current
Notes
AD8370
(VS=5V, T=25°C, RS=200, gain unless otherwise noted)
Conditions
13.6
Units
Vout 1Vp-p, Vout 1Vp-p, 1Vp-p Composite
Vout 1Vp-p, Vout 1Vp-p, 1Vp-p Composite 13.5
Vout 1Vp-p, Vout 1Vp-p, 1Vp-p Composite 11.2
PWUP high -40°C 85°C PWUP high, Vout 1Vp-p, (includes load current) PWUP -40°C 85°C
PWUP
Rev. 3/12/03
AD8370
Preliminary Technical DatS
Typical Performance Characteristics =200, =100, T=25°C, unless otherwise noted)
1111111 1000000 0100000
log(Av)
0010000 0001000 0000100 0000010 0000001
1000
FREQUENCY
Frequency
High-Gain Mode Response
1111111
Output Third Order Intercept versus Frequency Maximum Gain
P1dB
P1dB dBVrms
1000000 0100000 0010000
log(Av)
0001000 0000100
0000010 0000001
Frequency 1000
FREQUENCY
Low-Gain Mode Response
45.00 35.00 25.00
Output Compression Point versus Frequency Maximum Gain
Gain
15.00 5.00 -5.00 -15.00 -25.00
Gain Code
FREQUENCY
Gain versus Gain Code
Noise Figure versus Frequency Maximum Gain
Rev. 3/12/03
OUTPUT dBVrms
OUTPUT
Preliminary Technical DatBasic Connections Figure shows minimum connections required basic operation AD8370. Supply voltages between 5.5V allowed. supply VCCO VCCI pins should decoupled with least inductance surface-mount ceramic capacitor placed close possible device. More effective decoupling provided placing 100pF capacitor parallel including ferrite bead series with supply. performance when used unbalanced environment.
AD8370
AD8370 designed fine gain adjustment variable gain amplifier. gain control transfer function linear voltage gain. decibel scale, this results exponential transfer functions indicated gain transfer function, slope steep, providing rather coarse control function. higher gain control range step size decreased allowing precise gain adjustment. linear voltage gain expressed with respect gain code
GainCode Vernier PreGain
Figure Basic Connections AD8370 designed used differential signal chains. Differential signaling allows improved evenorder harmonic cancellation better common-mode immunity than achieved using single-ended design. order fully exploit these benefits, necessary drive load device balanced manner. This requires some care order ensure that commonmode impedance values presented each inputs outputs balanced. Driving device using unbalanced source degrade common-mode rejection ratio. Loading device with unbalanced load cause degradation even-order harmonic distortion premature output compression. general, optimum designs will fully balanced, though AD8370 still provide impressive
where linear voltage gain. Gain Code digital gain control word minus MSB. Vernier =0.055744 PreGain =7.079458 most significant 8bit gain control word. example, gain control word 10101101 (173 decimal) would result linear voltage gain 17.76V/V, calculated Digital Interface digital control port uses standard interfacing. 8-bit control word read serial fashion when LTCH held low. levels presented DATA read each rising edge CLCK signal. Figure illustrates timing diagram control interface. Typical
Rev. 3/12/03
AD8370
Preliminary Technical Datand gain accuracy will adequate most applications.
minimum values various timing parameters presented table Figure Digital Timing Diagram
Parameter
Clock Pulse Width (TPW) Clock Period (TCK) Setup Time Data Clock (TDS) Setup Time Data Enable Clock (TES) Hold Time Data Enable Clock (TEH)
Units
Figure Single-Ended Differential Conversion Evaluation Board evaluation board allows quick testing AD8370 using standard test equipment. schematic shown Figure Transformers used transform source load impedances desired input output reference levels. Evaluation Board Software evaluation board comes with AD8370 control software that allows serial gain control from most computers. evaluation board connected cable parallel port computer. simply adjusting slider control software, gain code automatically updated AD8370.
Table Serial Programming Timing Parameters Single-Ended Differential Conversion AD8370 primarily designed differential signal interfacing. device used single-ended differential conversion simply terminating unused input ground using simple capacitor depicted Figure Even though differential balance upset when using singleended drive, distortion performance
Rev. 3/12/03
Preliminary Technical
AD8370
Figure Evaluation Software
Figure AD8370 Evaluation Board Schematic
Rev. 3/12/03
AD8370
Component GND, VOCM SW1, C10, PWUP
Preliminary Technical DatAD8370 Evaluation Board Configuration Options Function Power Interface Vector Pins: Apply supply voltage between GND. VOCM allows external monitoring common-mode input output bias levels. Device Enable: position power-up device. When position PWUP connected PWUP vectorpin. PWUP allows external power cycling device. provided allow proper cable termination. Serial Control Interface: evaluation board controlled using most PCs. Windows based control software shipped with evaluation kit. D-sub connector cable required connect evaluation board. necessary capacitor clock line depending quality port signas. capacitor usually sufficient reducing clock-overshoot. Input Output Signal Connectors: These connectors provide convenient interface evaluation board with test equipment. Typically device will evaluated using single-ended source load. source should connect (IN+), load should connect (OUT+). Coupling Capacitors: Provides coupling input output signals. Impedance Transformers: provides impedance transformation. provides impedance transformation. Single Ended Differential: used ground center secondary windings transformers should used ground when used single ended applications. Power Supply Decoupling: Nominal supply decoupling consists ferrite bead series inductor followed capacitor ground followed 0.1µF capacitor ground positioned close device possible. provides additional decoupling input common mode voltage. provides high-frequency isolation between analog digital ground. Default Condition Applicable installed R8=49.9 (Size 0805) C10=open (Size 0805) installed R7=1k (Size 0603) open (Size 0603)
Applicable
(Size 0603) T1=TC4-1W JTX-2-10T (MiniCircuits) (Size 0603) (Size 0805) 0.1µF (Size 0603) L2=HZ1206E601R-00 (Size 1206, Steward)
Rev. 3/12/03
Preliminary Technical DatOUTLINE DIMENSIONS
Lead TSSOP (RU-16)
0.201 (5.10) 0.193 (4.90)
AD8370
0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25)
0.006 (0.15) 0.002 (0.05) 0.0433 (1.10)
SEATING PLANE
0.0256 (0.65) 0.0118 (0.30) 0.0079 (0.20) 0.0075 (0.19) 0.0035 (0.090)
0.028 (0.70) 0.020 (0.50)
Dimensions shown inches (mm)
Rev. 3/12/03
Other recent searches
STPS1545D - STPS1545D STPS1545D Datasheet
STM32W108 - STM32W108 STM32W108 Datasheet
PWR-8GHS+ - PWR-8GHS+ PWR-8GHS+ Datasheet
MC68HC05B6 - MC68HC05B6 MC68HC05B6 Datasheet
DW025 - DW025 DW025 Datasheet
Privacy Policy | Disclaimer
© 2012 Datasheet Archive
