DAC0808 8-Bit Converter DAC0808 8-bit monolithic digital-to-analo

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DAC0808 8-Bit Converter DAC0808 8-bit monolithic digital-to-analo

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DAC0808 8-Bit Converter
DAC0808 8-Bit Converter
DAC0808 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/256. Relative accuracies better than 0.19% assure 8-bit monotonicity linearity while zero level output current less than provides 8-bit zero accuracy IREF2 power supply currents DAC0808 independent codes, exhibits essentially constant device characteristics over entire supply voltage range. DAC0808 will interface directly with popular TTL, CMOS logic levels, direct replacement MC1508/MC1408. higher speed applications, DAC0800 data sheet.
Features
Relative accuracy: 0.19% error maximum Full scale current match: Fast settling time: Noninverting digital inputs CMOS compatible High speed multiplying input slew rate: mA/µs Power supply voltage range: 4.5V power consumption:
Block Connection Diagrams
DS005687-1
Dual-In-Line Package
DS005687-2
View Order Number DAC0808 Package M16A N16A
2001 National Semiconductor Corporation
DS005687
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DAC0808
Block Connection Diagrams
(Continued)
Small-Outline Package
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Ordering Information
ACCURACY OPERATING TEMPERATURE RANGE 8-bit 0°CTA+75°C PACKAGE (N16A) (Note DAC0808LCN MC1408P8 PACKAGE (M16A) DAC0808LCM
Note Devices ordered using either order number.
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DAC0808
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, V14, Power Dissipation (Note Susceptibility (Note VCC, 1000
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)
-65°C +150°C 260°C 300°C 215°C 220°C
Operating Ratings
Temperature Range DAC0808 TMIN TMAX +75°C
Electrical Characteristics
(VCC VDC, VREF/R14 digital inputs high logic level unless otherwise noted.) Symbol Parameter Relative Accuracy (Error Relative Full Scale DAC0808LC (LM1408-8) Settling Time Within
Conditions (Figure
Units
0.19
=25°C (Note (Figure 25°C, (Figure (Figure (Figure 0.8V (Figure (Figure -15V, 25°C -0.003 0.040 -0.8
ppm/°C
(Includes tPLH) tPLH, tPHL TCIO Propagation Delay Time Output Full Scale Current Drift Digital Input Logic Levels High Level, Logic Level, Logic Digital Input Current High Level Level Reference Input Bias Current Output Current Range
Output Current
VREF 2.000V, 1000, (Figure 1.99 -0.55, +0.4 -5.0, +0.4 (Figure -16.5V (Figure -4.3 -16.5 0.05 mA/µs µA/V
Output Current, Bits Output Voltage Compliance (Note =-5V, IREF Below -10V SRIREF Reference Current Slew Rate Output Current Power Supply Sensitivity Power Supply Current (All Bits Low) Power Supply Voltage Range Power Dissipation
(Figure 0.19%, 25°C
25°C, (Figure -4.5
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DAC0808
Electrical Characteristics
Symbol Bits Bits High Parameter
(Continued)
(VCC VDC, VREF/R14 digital inputs high logic level unless otherwise noted.) Conditions -15V 15V, 15V, -15V Units
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 TA)/JA number given Absolute Maixmum Ratings, whichever lower. this device, TJMAX 125°C, typical junction-to-ambient thermal resistance dual-in-line package when board mounted 100°C/W. dual-in-line package, this number increases 175°C/W small outline package this number 100°C/W. 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
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FIGURE +10V Output Digital Analog Converter (Note
Typical Performance Characteristics
Logic Input Current Input Voltage
-15V, 25°C, unless otherwise noted Logic Threshold Voltage Temperature
Transfer Characteristics
DS005687-14
DS005687-15 DS005687-16
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DAC0808
Typical Performance Characteristics
noted (Continued) Output Current Output Voltage (Output Voltage Compliance)
-15V, 25°C, unless otherwise
Output Voltage Compliance Temperature
Typical Power Supply Current Temperature
DS005687-18 DS005687-17 DS005687-19
Typical Power Supply Current
Typical Power Supply Current
Reference Input Frequency Response
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Unless otherwise specified: VEE; ground. Curve Large Signal Bandwidth Method Figure VREF Vp-p offset above ground. Curve Small Signal Bandwidth Method Figure 250, VREF mVp-p offset above ground. Curve Large Small Signal Bandwidth Method Figure amp, 50), VREF mVp-p centered
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DAC0808
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DS005687-4
FIGURE Equivalent Circuit DAC0808 Series (Note
DAC0808
Test Circuits
DS005687-6
apply inputs A1-A8. resistor tied temperature compensate bias current necessary applications.
high level level
FIGURE Notation Definitions Test Circuit (Note
DS005687-7
FIGURE Relative Accuracy Test Circuit (Note
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DAC0808
Test Circuits
(Continued)
DS005687-8
FIGURE Transient Response Settling Time (Note
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FIGURE Reference Current Slew Rate Measurement (Note
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FIGURE Positive VREF (Note
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DAC0808
Test Circuits
(Continued)
DS005687-11
FIGURE Negative VREF (Note
DS005687-12
FIGURE Programmable Gain Amplifier Digital Attenuator Circuit (Note
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, I14, must always flow into regardless set-up method reference voltage polarity. Connections positive voltage shown Figure reference voltage source supplies full current I14.
bipolar reference signals, multiplying mode, 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. negative reference voltage used grounded reference voltage applied shown Figure high input impedance main
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DAC0808
Application Hints
(Continued)
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 -0.55 0.4V when current switching methods employed DAC0808. negative output voltage compliance DAC0808 extended where negative supply voltage more negative than -10V. Using full-scale current 1.992 load resistor between ground will yield voltage output levels between -4.980V. Floating does affect converter speed power dissipation. However, value load resistor determines switching time increased voltage swing. Values significantly affect performance, load increases worst-case settling time (when bits switched ON). 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 -8V, 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 lad-
der. 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 1.992 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 12-bit converter calibrated full-scale output current 1.992 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 65,536 0.00076%, which much more accurate than 0.019% specification provided DAC0808. MULTIPLYING ACCURACY DAC0808 used multiplying mode with 8-bit accuracy when reference current varied over range 256:1. 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 LSB, 8-bit accuracy, 6-bit accuracy. turn typically under These times apply when 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.
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DAC0808
Physical Dimensions
inches (millimeters) unless otherwise noted
Small Outline Package Order Number DAC0808LCM Package Number M16A
Dual-In-Line Package Order Number DAC0808 Package Number N16A
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DAC0808 8-Bit Converter
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com
National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

DAC0808 8-Bit Converter DAC0808 8-bit monolithic digital-to-analo

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