DAC0808 DAC0807 DAC0806 8-Bit Converters DAC0808 series 8-bit mon

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DAC0808 DAC0807 DAC0806 8-Bit Converters DAC0808 series 8-bit mon

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DAC0808 DAC0807 DAC0806 8-Bit Converters
DAC0808 DAC0807 DAC0806 8-Bit Converters
DAC0808 series 8-bit monolithic digital-to-analog converter (DAC) featuring full scale output current settling time while dissipating only with supplies reference current (IREF) trimming required most applications since full scale output current typically IREF Relative accuracies better than assure 8-bit monotonicity linearity while zero level output current less than provides 8-bit zero accuracy IREFt2 power supply currents DAC0808 series independent codes exhibits essentially constant device characteristics over entire supply voltage range DAC0808 will interface directly with popular CMOS logic levels direct replacement MC1508 MC1408 higher speed applications DAC0800 data sheet
Features
Relative accuracy error maximum (DAC0808) Full scale current match 6-bit accuracy available (DAC0807 DAC0806) Fast settling time Noninverting digital inputs CMOS compatible High speed multiplying input slew rate Power supply voltage range power consumption
Block Connection Diagrams
Dual-In-Line Package
Order Number DAC0808 DAC0807 DAC0806 Package Number J16A M16A N16A
5687 5687
Small-Outline Package
5687
View
Ordering Information
ACCURACY OPERATING TEMPERATURE RANGE CsTAs CsTAs ORDER NUMBERS PACKAGE (N16A) PACKAGE (M16A) DAC0808LCN MC1408P8 DAC0808LCM DAC0807LCJ MC1408L7 DAC0807LCN MC1408P7 DAC0807LCM DAC0806LCJ MC1408L6 DAC0806LCN MC1408P6 DAC0806LCM PACKAGE (J16A)
7-bit 6-bit
Note Devices ordered using either order number
C1995 National Semiconductor Corporation
5687
RRD-B30M115 Printed
Absolute Maximum Ratings (Note
Military Aerospace specified devices required please contact National Semiconductor Sales Office Distributors availability specifications Power Supply Voltage Digital Input Voltage V5-V12 Applied Output Voltage Reference Current Reference Amplifier Inputs Power Dissipation (Note 1000 Susceptibility (Note Storage Temperature Range Lead Temp (Soldering seconds) Dual-In-Line Package (Plastic) Dual-In-Line Package (Ceramic) Surface Mount Package Vapor Phase seconds) Infrared seconds)
Operating Ratings
Temperature Range DAC0808LC Series TMIN TMAX
Electrical Characteristics
(VCC VREF DAC0808 DAC0808C DAC0807C DAC0806C digital inputs high logic level unless otherwise noted Symbol Parameter Relative Accuracy (Error Relative Full Scale DAC0808LC (LM1408-8) DAC0807LC (LM1408-7) (Note DAC0806LC (LM1408-6) (Note Settling Time Within (Includes tPLH) Propagation Delay Time Output Full Scale Current Drift Digital Input Logic Levels High Level Logic ``1'' Level Logic ``0'' Digital Input Current High Level Level Reference Input Bias Current Output Current Range Conditions Units
(Figure
(Note (Figure (Figure
tPLH tPHL TCIO
(Figure
(Figure (Figure (Figure b15V
VREF 000V 1000X (Figure (Figure
Output Current
Output Current Bits Output Voltage Compliance (Note eb5V IREF Below b10V
Electrical Characteristics (Continued) (VCC VREF DAC0808 DAC0808C DAC0807C DAC0806C digital inputs high logic level unless otherwise noted
Symbol SRIREF Parameter Reference Current Slew Rate Output Current Power Supply Sensitivity Power Supply Current (All Bits Low) Power Supply Voltage Range Power Dissipation Bits Bits High
Conditions
Units
(Figure
(Figure
(Figure
b15V b15V
Note Absolute Maximum Ratings indicate limits beyond which damage device occur electrical specifications apply when operating device beyond specified operating conditions Note Range control required Note maximum power dissipation must derated elevated temperatures dictated TJMAX ambient temperature maximum allowable power dissipation temperature (TJMAX number given Absolute Maixmum Ratings whichever lower this device TJMAX typical junction-to-ambient thermal resistance dual-in-line package when board mounted dual-inline package this number increases small outline package this number Note Human body model discharged through resistor Note current switches tested guarantee least rated current Note bits switched Note Pin-out numbers DAL080X represent dual-in-line package small outline package pinout differs from dual-in-line package
Typical Application
5687
FIGURE Output Digital Analog Converter (Note
Typical Performance Characteristics
b15V unless otherwise noted Logic Input Current Input Voltage Transfer Characteristics Logic Threshold Voltage Temperature
Output Current Output Voltage (Output Voltage Compliance)
Output Voltage Compliance Temperature
Typical Power Supply Current Temperature
Typical Power Supply Current
Typical Power Supply Current
Reference Input Frequency Response
5687
Unless otherwise specified ground Curve Large Signal Bandwidth Method Figure VREF Vp-p offset above ground Curve Small Signal Bandwidth Method Figure 250X VREF mVp-p offset above ground Curve Large Small Signal Bandwidth Method Figure 50X) VREF mVp-p centered
5687
FIGURE Equivalent Circuit DAC0808 Series (Note
Test Circuits
apply inputs resistor tied temperature compensate bias current necessary applications
VREF where ``1'' high level ``0'' level
5687-6
FIGURE Notation Definitions Test Circuit (Note
5687
FIGURE Relative Accuracy Test Circuit (Note
5687
FIGURE Transient Response Settling Time (Note
Test Circuits (Continued)
5687 5687
FIGURE Positive VREF (Note
FIGURE Reference Current Slew Rate Measurement (Note
5687
FIGURE Negative VREF (Note
5687
Application Hints
REFERENCE AMPLIFIER DRIVE COMPENSATION reference amplifier provides voltage converting reference voltage current turn-around circuit current mirror feeding ladder reference amplifier input currrent must always flow into regardless set-up method reference voltage polarity Connections positive voltage shown Figure reference voltage source supplies full current bipolar reference signals multiplying mode
FIGURE Programmable Gain Amplifier Digital Attenuator Circuit (Note
tied negative voltage corresponding minimum input level possible eliminate with only small sacrifice accuracy temperature drift compensation capacitor value must increased with increases maintain proper phase margin values minimum capacitor values capacitor tied either ground using increases negative supply rejection
Application Hints (Continued)
negative reference voltage used grounded reference voltage applied shown Figure high input impedance main advantage this method Compensation involves capacitor using values previous paragraph negative reference voltage must least above supply Bipolar input signals handled connecting positive reference voltage equal peak positive input level When reference voltage used capacitive bypass ground recommended logic supply recommended reference voltage well regulated supply which drives logic used reference should decoupled connecting through another resistor bypassing junction resistors with ground reference voltages greater than clamp diode recommended between ground driven high impedance such transistor current source none above compensation methods apply amplifier must heavily compensated decreasing overall bandwidth OUTPUT VOLTAGE RANGE voltage restricted range when current switching methods employed DAC0808 negative output voltage compliance DAC0808 extended where negative supply voltage more negative than b10V Using full-scale current load resistor between ground will yield voltage output levels between 980V Floating does affect converter speed power dissipation However value load resistor determines switching time increased voltage swing Values 500X significantly affect performance load increases worst-case settling time (when bits switched Refer subsequent text section Settling Time more details output loading OUTPUT CURRENT RANGE output current maximum rating used only negative supply voltages more negative than increased voltage drop across resistors reference current amplifier ACCURACY Absolute accuracy measure each output current level with respect intended value dependent upon relative accuracy full-scale current drift Relative accuracy measure each output current level fraction full-scale current relative accuracy DAC0808 essentially constant with temperature excellent temperature tracking monolithic resistor ladder reference current drift with temperature causing change absolute accuracy output current However DAC0808 very full-scale current drift with temperature DAC0808 series guaranteed accurate within full-scale output current This corresponds reference amplifier output current drive ladder network with loss which ladder remainder shunted ground input current guaranteed value between allowing some mismatch current source pair accuracy test circuit shown Figure 12bit converter calibrated full-scale output current This optional step since DAC0808 accuracy essentially same between Then DAC0808 circuits' full-scale current trimmed same value with that zero value appears error amplifier output counter activated error band displayed oscilloscope detected comparators stored peak detector 8-bit D-to-A converters used construct 16-bit accuracy D-to-A converter 16-bit accuracy implies total error part 00076% which much more accurate than 019% specification provided DAC0808 MULTIPLYING ACCURACY DAC0808 used multiplying mode with 8-bit accuracy when reference current varied over range reference current multiplying mode ranges from additional error contributions less than This well within 8-bit accuracy when referred full-scale monotonic converter which supplies increase current each increment binary word Typically DAC0808 monotonic values reference current above recommended range operation with reference current SETTLING TIME worst-case switching condition occurs when bits switched which corresponds low-to-high transition bits This time typically settling within 8-bit accuracy 6-bit accuracy turn typically under These times apply when 500X Extra care must taken board layout since this usually dominant factor satisfactory test results when measuring settling time Short leads supply bypassing frequencies minimum scope lead length mandatory
Physical Dimensions inches (millimeters)
Dual-In-Line Package Order Number DAC0807 DAC0806 Package Number J16A
Small Outline Package Order Number DAC0806LCM DAC0807LCM DAC0808LCM Package Number M16A
DAC0808 DAC0807 DAC0806 8-Bit Converters
Physical Dimensions inches (millimeters) (Continued)
Dual-In-Line Package Order Number DAC0808 DAC0807 DAC0806 Package Number N16A
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DAC0808 DAC0807 DAC0806 8-Bit Converters DAC0808 series 8-bit mon

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