DAC761 12-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER FEATU
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DAC761
12-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER
FEATURES
POWER: 2.5mW FAST SETTLING: WITH 4.095V FULL-SCALE RANGE COMPLETE WITH REFERENCE 12-BIT LINEARITY MONOTONICITY OVER INDUSTRIAL TEMP RANGE ASYNCHRONOUS RESET 3-WIRE INTERFACE: 20MHz Clock ALTERNATE SOURCE DAC8512
DESCRIPTION
DAC7611 12-bit digital-to-analog converter (DAC) with guaranteed 12-bit monotonicity performance over industrial temperature range. requires single supply contains input shift register, latch, 2.435V reference, DAC, high speed rail-to-rail output amplifier. full-scale step, output will settle within 7µs. device consumes 2.5mW (0.5mA 5V). synchronous serial interface compatible with wide variety DSPs microcontrollers. Clock (CLK), serial data (SDI), load strobe (LD) comprise serial interface. addition, control pins provide chip select (CS) function asynchronous clear (CLR) input. input used ensure that DAC7611 output power-up required application. DAC7611 available 8-lead SOIC 8-pin plastic package fully specified over industrial temperature range -40°C +85°C.
APPLICATIONS
PROCESS CONTROL DATA ACQUISITION SYSTEMS CLOSED-LOOP SERVO-CONTROL PERIPHERALS PORTABLE INSTRUMENTATION
DAC761
12-Bit VOUT
Register
Serial Shift Register
International Airport Industrial Park Mailing Address: 11400, Tucson, 85734 Street Address: 6730 Tucson Blvd., Tucson, 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
1997 Burr-Brown Corporation
PDS-1402A
Printed U.S.A. DAC7611 April, 1998
SPECIFICATIONS
ELECTRICAL
-40°C +85°C, +5V, unless otherwise noted. DAC7611P, PARAMETER ACCURACY Resolution Relative Accuracy(1) Differential Nonlinearity Zero-Scale Error Full Scale Voltage ANALOG OUTPUT Output Current Load Regulation Capacitive Load Short Circuit Current Short Circuit Duration DIGITAL INPUT Data Format Data Coding Logic Family Logic Levels DYNAMIC PERFORMANCE Settling Time(2) (tS) Glitch Digital Feedthrough POWER SUPPLY Power Dissipation Power Supply Sensitivity TEMPERATURE RANGE Specified Performance Same specification DAC7611P, NOTES: This term sometimes referred Linearity Error Integral Nonlinearity (INL). Specification does apply negative-going transitions where final output voltage will within LSBs ground. this region, settling time double value indicated. Final Value CONDITIONS 4.079 4.087 DAC7611PB, UNITS Bits
Guaranteed Monotonic Code 000H Code FFFH Code 800H RLOAD 402, Code 800H Oscillation
±1/2 ±1/2 4.095 Indefinite Serial Straight Binary
4.11
±1/4 ±1/4 4.095
4.103
+4.75 Load, Code 000H Load +5.0 0.001 +5.25 0.004
nV-s nV-s
information provided herein believed reliable; however, BURR-BROWN assumes responsibility inaccuracies omissions. BURR-BROWN assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licenses circuits described herein implied granted third party. BURR-BROWN does authorize warrant BURR-BROWN product life support devices and/or systems.
DAC761
CONFIGURATION
View
DESCRIPTION
LABEL DESCRIPTION Power Supply Chip Select (active LOW). Synchronous Clock Serial Data Input. Serial Data Input. Data clocked into internal serial register rising edge CLK. Loads Internal Register. NOTE: register transparent latch transparent when (regardless state CLK). Asynchronous Input Clear Register. When strobbed LOW, register 000H output voltage Ground Voltage Output. Fixed output voltage range approximately 4.095V (1mV/LSB). internal reference maintains this output range over time, temperature, power supply variations (within values defined specifications section).
DAC761
VOUT
CONFIGURATION
View SOIC VOUT
DAC761
VOUT
ELECTROSTATIC DISCHARGE SENSITIVITY
ABSOLUTE MAXIMUM RATINGS(1)
-0.3V Digital Inputs -0.3V 0.3V VOUT -0.3V 0.3V Power Dissipation 325mW Thermal Resistance, 150°C/W Maximum Junction Temperature +150°C Operating Temperature Range -40°C +85°C Storage Temperature Range -65°C +150°C Lead Temperature (soldering, 10s) +300°C NOTE: Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. Exposure absolute maximum conditions extended periods affect device reliability.
This integrated circuit damaged ESD. Burr-Brown recommends that integrated circuits handled with appropriate precautions. Failure observe proper handling installation procedures cause damage. damage range from subtle performance degradation complete device failure. Precision integrated circuits more susceptible damage because very small parametric changes could cause device meet published specifications.
PACKAGE/ORDERING INFORMATION
MINIMUM RELATIVE ACCURACY (LSB) DIFFERENTIAL NONLINEARITY (LSB) SPECIFICATION TEMPERATURE RANGE -40°C +85°C -40°C +85°C PACKAGE DRAWING NUMBER(1)
PRODUCT DAC7611P DAC7611U
PACKAGE 8-Pin 8-Lead SOIC
ORDERING NUMBER(2) DAC7611P DAC7611U DAC7611U/2K5 DAC7611PB DAC7611UB DAC7611UB/2K5
TRANSPORT MEDIA Rails Rails Tape Reel Rails Rails Tape Reel
DAC7611PB DAC7611UB
-40°C +85°C -40°C +85°C
8-Pin 8-Lead SOIC
NOTES: detailed drawing dimension table, please data sheet, Appendix Burr-Brown Data Book. Models with slash available only Tape Reel quantities indicated (e.g., /2K5 indicates 2500 devices reel). Ordering 2500 pieces "DAC7611/2K5" will single 2500-piece Tape Reel. detailed Tape Reel mechanical information, refer Appendix Burr-Brown Data Book.
DAC761
EQUIVALENT INPUT LOGIC
protection diodes
Switches
Force 000H
Register
Latched Transparent
Data
Serial Shift Register
DAC761
TIMING DIAGRAMS
(MSB) (LSB)
tCSS tLD1 tLD2 tCSH
tLDW tCLRW VOUT Error Band
LOGIC TRUTH TABLE
CS(1) CLK(1) H(2) H(2) L(3) SERIAL SHIFT REGISTER Change Change Change Advanced Advanced Change Change Change Change REGISTER Change Change Change Change Change Changes Value Serial Shift Register Transparent Loaded with 000H Latched with 000H
TIMING SPECIFICATIONS
-40°C +85°C +5V. SYMBOL tLDW tCLRW tLD1 tLD2 tCSS tCSH DESCRIPTION Clock Width HIGH Clock Width Load Pulse Width Data Setup Data Hold Clear Pulse Width Load Setup Load Hold Select Deselect UNITS
Positive Logic Transition; Negative Logic Transition; Don't Care. NOTES: interchangeable. HIGH value suggested order avoid "false clock" from advancing shift register changing voltage. data clocked into serial register while LOW, output voltage will change, reflecting current value serial shift register.
NOTE: input control signals specified with (10% +5V) timed from voltage level 1.6V. These parameters guaranteed design subject production testing.
DAC761
TYPICAL PERFORMANCE CURVES
+25°, unless otherwise specified.
OUTPUT SWING LOAD
PULL-DOWN VOLTAGE OUTPUT SINK CURRENT
Output Voltage
Delta VOUT (mV)
85°C (mV) 25°C
tied AGND Data FFFH
tied Data 000H
-40°C Data 000H
Load Resistance 100k
0.01 0.00
Current (mA)
BROADBAND NOISE
SUPPLY CURRENT LOGIC INPUT VOLTAGE Load
Noise Voltage (500µV/div)
Supply Current (mA)
Code FFFH 2MHz
Time (2ms/div)
Logic Voltage
POWER SUPPLY REJECTION FREQUENCY
(dB)
MINIMUM SUPPLY VOLTAGE LOAD Data FFFH
Data FFFH ±200mV
Minimum
100k
Frequency (Hz)
0.010
0.100
1.000
10.000
Output Load Current (mA)
DAC761
TYPICAL PERFORMANCE CURVES (CONT)
+25°, unless otherwise specified.
SHORT-CIRCUIT CURRENT OUTPUT VOLTAGE
Output Current (mA)
SUPPLY CURRENT TEMPERATURE VLOGIC 2.4V Data FFFH Load
Data 800H Output tied ISOURCE
Supply Current (mA)
Positive Current Limit
5.0V
5.25V
Negative Current Limit
4.75V
Output Voltage
Temperature (°C)
MIDSCALE GLITCH PERFORMANCE
MIDSCALE GLITCH PERFORMANCE
VOUT (10mV/div)
VOUT
VOUT (10mV/div)
VOUT
7FFH 800H
800H 7FFH
Time (500ns/div)
Time (500ns/div)
LARGE-SIGNAL SETTLING TIME 110pF Load
Output Voltage (1mV/div)
RISE TIME DETAIL
1V/div
VOUT
VOUT
Time (20µs/div)
Time (10µs/div)
DAC761
TYPICAL PERFORMANCE CURVES (CONT)
+25°, unless otherwise specified.
FALL TIME DETAIL
10.000
OUTPUT VOLTAGE NOISE FREQUENCY Data FFFH
Output Voltage (1mV/div)
Noise (µV/Hz)
1.000
VOUT
0.100
0.010
Time (10µs/div)
Frequency (Hz)
100k
LONG-TERM DRIFT ACCELERATED BURN-IN Units
TOTAL UNADJUSTED ERROR HISTOGRAM T.U.E Sample Size Units +25°C
Output Voltage Change (mV)
Number Units
1200
1000 Hours Operation +150°C
FULL-SCALE VOLTAGE TEMPERATURE 4.115 4.110
Full-Scale Output
ZERO-SCALE VOLTAGE TEMPERATURE
Load Sample Size
4.105 4.100 4.095 4.090 4.085 4.080 4.075 Temperature (°C)
Zero-Scale (mV)
Temperature (°C)
DAC761
TYPICAL PERFORMANCE CURVES (CONT)
+25°, unless otherwise specified.
LINEARITY ERROR DIGITAL CODE +85°C)
LINEARITY ERROR DIGITAL CODE +25°C)
Linearity Error (LSBs)
Linearity Error (LSBs)
-0.5 -1.0 -1.5 -2.0 1024 1536 2048 Code 2560 3072 3584 4096
-0.5 -1.0 -1.5 -2.0 1024 1536 2048 Code 2560 3072 3584 4096
LINEARITY ERROR DIGITAL CODE -40°C)
Linearity Error (LSBs)
-0.5 -1.0 -1.5 -2.0 1024 1536 2048 Code 2560 3072 3584 4096
DAC761
OPERATION
DAC7611 12-bit digital-to-analog converter (DAC) complete with serial-to-parallel shift register, register, laser-trimmed 12-bit DAC, on-board reference, rail-to-rail output amplifier. Figure shows basic operation DAC7611. INTERFACE Figure shows basic connection between microcontroller DAC7611. interface consists serial clock (CLK), serial data (SDI), load strobe signal (LD). addition, chip select (CS) input available enable serial communication when there multiple serial devices. data format Straight Binary loaded MSB-first into shift registers. asynchronous
DAC7611 Full-Scale Range 4.095V Least Significant DIGITAL INPUT CODE STRAIGHT BINARY FFFH 801H 800H 7FFH 000H ANALOG OUTPUT +4.095 +2.049 +2.048 +2.047
DESCRIPTION Full Scale Midscale Midscale Midscale Zero Scale
clear input (CLR) provided simplify start-up periodic resets. Table shows relationship between input code output voltage. digital data into DAC7611 double-buffered. This means that data entered into without disturbing data analog output converter. some point after data been entered into serial shift register, this data transferred into register. This transfer accomplished with HIGH transition pin. However, makes register transparent. data shifted into shift register while LOW, output voltage will change each entered. prevent this, must returned HIGH prior shifting serial data. time, contents register 000H (analog output equals taking input LOW. register will remain this value until returned HIGH taken allow contents shift register transferred register. when taken LOW, register will 000H analog output driven When returned HIGH, register will current value serial shift register analog output will respond accordingly. DIGITAL-TO-ANALOG CONVERTER internal section 12-bit voltage output device that swings between ground internal reference voltage. realized laser-trimmed R-2R ladder network which switched N-channel MOSFETs. output internally connected rail-to-rail output operational amplifier. OUTPUT AMPLIFIER precision, low-power amplifier buffers output section provides additional gain achieve 4.095V range. amplifier offset voltage, noise, gain 1.682V/V (4.095/2.435). Figure equivalent circuit schematic analog portion DAC7611.
R-2R Output Amplifier
TABLE Digital Input Code Corresponding Ideal Analog Output.
DAC7611 0.1µF Serial Clock From Serial Data Load Strobe VOUT +4.095V
10µF
FIGURE Basic Operation DAC7611.
Buffer Bandgap Reference 2.435V
FIGURE Simplified Schematic Analog Portion.
DAC761
output amplifier typical settling time final value. Note that there differences settling time negative-going signals versus positivegoing signals. rail-to-rail output stage amplifier provides full-scale range 4.095V while operating supply voltage 4.75V. addition ability drive resistive loads, amplifier will remain stable while driving capacitive loads 500pF. Figure equivalent circuit schematic amplifier's output driver Typical Performance Curves section more information regarding settling time, load driving capability, output noise.
DAC7611 power supply should bypassed shown Figure bypass capacitors should placed close device possible, with 0.1uF capacitor taking priority this regard. Power Supply Rejection Frequency graph Typical Performance Curves section shows PSRR performance DAC7611. This should taken into account when using switching power supplies DC/DC converters. addition offering guaranteed performance with 4.75V 5.25V range, DAC7611 will operate with reduced performance down 4.5V. Operation between 4.5V 4.75V will result longer settling time, reduced performance, current sourcing capability. Consult Load Current graph Typical Performance Curves section more information.
P-Channel
APPLICATIONS
POWER GROUNDING DAC7611 used wide variety situations- from power, battery operated systems large-scale industrial process control systems. addition, some applications require better performance than others, particularly sensitive specific parameters. This diversity makes difficult define definite rules follow concerning power supply, bypassing, grounding. following discussion must considered relation desired performance needs particular system. precision analog component requires careful layout, adequate bypassing, clean, well-regulated power supply. DAC7611 single-supply, component, will often used conjunction with digital logic, microcontrollers, microprocessors, digital signal processors. more digital logic present design higher switching speed, more difficult will achieve good performance. Because DAC7611 single ground pin, return currents, including digital analog return currents, must flow through this pin. also ground reference point internal bandgap reference. Ideally, would connected directly analog ground plane. This plane would separate from ground connection digital components until they connected power entry point system (see Figure power applied should well regulated lownoise. Switching power supplies DC/DC converters will often have high-frequency glitches spikes riding output voltage. addition, digital components create similar high frequency spikes their internal logic switches states. This noise easily couple into output voltage through various paths between VOUT.
VOUT
N-Channel
AGND
FIGURE Simplified Driver Section Output Amplifier.
POWER SUPPLY BiCMOS process careful design bipolar CMOS sections DAC7611 result very power device. Bipolar transistors used where tight matching noise needed achieve analog accuracy, CMOS transistors used logic, switching functions other power stages. power consumption critical, important keep logic levels digital inputs (SDI, CLK, CLR) close possible either ground. This will keep CMOS inputs (see "Supply Current Logic Input Voltages" Typical Performance Curves) from shunting current between ground. Thus, CMOS logic levels rather than logic levels, strongly recommended driving DAC7611.
DAC761
with connection, should connected power supply plane trace that separate from connection digital logic until they connected power entry point. addition, 10µF 0.1µF capacitors shown Figure strongly recommended should installed close ground possible. some situations, additional bypassing required such 100µF electrolytic capacitor even "Pi" filter made inductors capacitors-all designed essentially lowpass filter supply, removing high frequency noise (see Figure
OFFSET ERROR MEASUREMENT with most DACs, DAC7611 have offset error zero scale error) which either negative positive. error positive, output voltage input code 000H will greater than error negative, output voltage below However, since DAC7611 single-supply device cannot swing below ground, output voltage will giving impression that offset error zero. Since measuring offset error such common task, method needed reliably measure offset error DAC7611. This easily done shown Figure resistor between VOUT negative voltage provides output amplifier some ability swing below ground.
Power Supply 100µF Optional
Digital Circuits DAC7611 10µF 0.1µF
Other Analog Components
FIGURE Suggested Power Ground Connections DAC7611 Sharing Supply with Digital System.
DAC7611 0.1µF VOUT
10µF
200µA
FIGURE Offset Error Measurement Circuit.
DAC761
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