ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986D8-Bit ResolutionDEasy Microprocessor interface orDDDDDD ADC0831 . . . P PACKAGE(TOP VIEW)Stand-Alone OperationOperates Ratiometrically or With 5-VReferenceSingle Channel or Multiplexed TwinChannels With Single-Ended or DifferentialInput OptionsInput Range 0 to 5 V With Single 5-V SupplyInputs and Outputs Are Compatible WithTTL and MOSConversion Time of 32 µs at CLK = 250 kHzDesigned to Be interchangeable WithNational Semiconductor ADC0831 andADC0832DEVICEADC0831ADC0832TOTAL UNADJUSTED ERRORA-SUFFIX±1 LSB±1 LSBB-SUFFIX±1/2 LSB±1/2 LSBCSIN+IN–GND12348765VCCCLKDOREFADC0832 . . . P PACKAGE(TOP VIEW)CSCH0CH1GND12348765VCC/REFCLKDODIdescriptionThese devices are 8-bit successive-approximation analog-to-digital converters. The ADC0831A andADC0831B have single input channels; the ADC0832A and ADC0832B have multiplexed twin input channels.The serial output is configured to interface with standard shift registers or microprocessors. Detailed informationon interfacing to most popular microprocessors is readily available from the factory.The ADC0832 multiplexer is software configured for single-ended or differential inputs. The differential analogvoltage input allows for common-mode rejection or offset of the analog zero input voltage value. In addition,the voltage reference input can be adjusted to allow encoding any smaller analog voltage span to the full 8 bitsof resolution.The operation of the ADC0831 and ADC0832 devices is very similar to the more complex ADC0834 andADC0838 devices. Ratiometric conversion can be attained by setting the REF input equal to the maximumanalog input signal value, which gives the highest possible conversion resolution. Typically, REF is set equalto VCC (done internally on the ADC0832). For more detail on the operation of the ADC0831 and ADC0832devices, refer to the ADC0834/A DC0838 data sheet.The ADC0831AC, ADC0831BC, ADC0832AC, and ADC0832BC are characterized for operation from 0°Cto70°C. The ADC0831AI, ADC0831BI, ADC0832AI, and ADC0832BI are characterized for operation from–40°C to 85°C.PRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.Copyright © 1996, Texas Instruments IncorporatedPOST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443••1SLAS006 – AUGUST 1985 – REVISED JUNE 1986ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL functional block diagramCLKCS71Shift RegisterDI(ADC0832Only)5DCLKOdd/EvenSStartRStartFlip-FlopCLK To InternalCircuitsSingle/DifferentialCH0/IN+CH1/IN–CLKSAnalogMuxENComparatorTimeDelayR1CSCS1CSCLKBits 0–7Bit 1MSBFirstOneShotLSBFirst1REOCCS1RCLKDCS16DOENREF(ADC0831Only)5LadderandDecoderBits 0–7RENSARLogicandLatch9-BitShiftRegister2POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443•• ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986sequence of operationADC08311CLKtsuCSMUXSettling TimeDOHI-ZMSB76543ADC08321CLKtconv2345610111213141819202121MSB-First DataHi-Z2345678910tconvLSB0tsuCSStart+SignSGLBitOddDI(ADC0832only)Don’t CareDifEvenMSB-First DataMUXSettling TimeDOMSB7621LSB0126LSB-First DataMSB7Hi-ZADC0832 MUX ADDRESS CONTROL LOGIC TABLEMUX ADDRESSSGL/DIFLLHHODD/EVENLHLHCHANNEL NUMBER0+–+1–++H = high level, L = low level,– or + = polarity of selected input pinPOST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443••3SLAS006 – AUGUST 1985 – REVISED JUNE 1986ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL absolute maximum ratings over recommended operating free-air temperature range (unlessotherwise noted)Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 VInput voltage range:Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 15 VAnalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3Input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5 mATotal input current for package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mAOperating free-air temperature range:C-suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°CI-suffix –40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C to 85°CStorage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°CLead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°CNOTE 1:All voltage values, except differential voltages, are with respect to the network ground terminal.recommended operating conditionsMINVCCVIHVILfclockSupply voltageHigh-level input voltageLow-level input voltageClock frequencyClock duty cycle (see Note 2)twH(CPulse duration, CS highS)tsuthTASetup time, CS low or ADC0832 data valid before CLK↑Hold time, ADC0832 data valid after CLK↑OperatingfreeairtemperatureOperating free-air temperatureC-suffixI-suffix1040220350900–4070854.520.840060NOM5MAX6.3UNITVVVkHz%nsnsns°CNOTE 2:The clock duty cycle range ensures proper operation at all clock frequencies. If a clock frequency is used outside the recommendedduty cycle range, the minimum pulse duration (high or low) is 1 µs.electrical characteristics over recommended range of operating free-air temperature, VCC = 5 V,fclock = 250 kHz (unless otherwise noted)digital sectionPARAMETERVOHVOLIIHIILIOHIOLIOZCiHighleveloutputvoltageHigh-level output voltageLow-levl output voltageHigh-level input currentLow-level input currentHigh-level output (source) currentLow-level output (sink) currentHigh-impedance-state outputgcurrent (DO)Input capacitanceTESTCONDITIONS{TEST CONDITIONSVCC = 4.75 V,VCC = 4.75 V,VCC = 4.75 V,VIH = 5 VVIL = 0VOH = VO,VOL = VCC,VO = 5 V,VO = 0,IOH = –360 µAIOH = –10 µAIOL = 1.6 mAC SUFFIXMINTYP‡MAX2.84.60.340.005–0.005TA = 25°CTA = 25°CTA = 25°CTA = 25°C–6.58–14160.01–0.0153–31–1–6.58I SUFFIXMINTYP‡2.44.50.40.005–0.005–14160.01–0.01553–31–1MAXUNITVVµAµAmAmAµApFpFCoOutput capacitance5†All parameters are measured under open-loop conditions with zero common-mode input voltage.‡All typical values are at VCC = 5 V, TA = 25°C.4POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443•• ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986electrical characteristics over recommended range of operating free-air temperature,VCC = 5 V, fclock = 250 kHz (unless otherwise noted)analog and converter sectionPARAMETERVICRCommon-mode input voltage rangeOn-channelII(I(stdby)tdb)Standbyinputcurrent(seeNote4)Standby input current (see Note 4)Off-channelOn-channelOff-channelri(REF)Input resistance to reference ladderTEST CONDITIONS†See Note 3VI = 5 VVI = 0VI = 0VI = 5 V1.32.4MIN–0.05toVCC+0.051–1–115.9kΩµATYP‡MAXUNITVtotal devicePARAMETERICCSupplycurrentSupply currentADC0831ADC0832TEST CONDITIONS†MINTYP‡13MAX2.55.2UNITmA†All parameters are measured under open-loop conditions with zero common-mode input voltage.‡All typical values are at VCC = 5 V, TA = 25°C.NOTES:3.If channel IN– is more positive than channel IN+, the digital output code will be 0000 0000. Connected to each analog input are twoon-chip diodes that conduct forward current for analog input voltages one diode drop above VCC .Care must be taken during testingat low VCC levels (4.5 V) because high-level analog input voltage (5 V) can, especially at high temperatures, cause this input diodeto conduct and cause errors for analog inputs that are near full-scale. As long as the analog voltage does not exceed the supplyvoltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 V to 5 V input voltage range requires a minimumVCC of 4.95 V for all variations of temperature and load.4.Standby input currents are currents going into or out of the on or off channels when the A/D converter is not performing conversionand the clock is in a high or low steady-state condition.operating characteristics VCC = REF = 5 V, fclock = 250 kHz, tr = tf = 20 ns, TA = 25°C (unless otherwisenoted)PARAMETERSupply-voltage variation errorTotal unadjusted error (see Note 5)Common-mode errortpddPropagation delay time, ouputdataafterCLK↑ouput data after CLK(see Note 6)Output disable time,,DO after CS↑Conversion time (multiplexer addressingtime not included)MSB-first dataLSB-first dataCL = 100 pF=100pFCL = 10 pF, RL = 10 kΩCL = 100 pF, RL = 2 kΩTESTCONDITIONS§TEST CONDITIONS§VCC = 4.75 V to 5.25 VVref = 5 V,TA = MIN to MAXDifferential modeAI, AC SUFFIXMINTYP±1/16MAX±1/4±1±1/16650250125±1/415006002505008±1/16650250125BI, BC SUFFIXMINTYP±1/16MAX±1/4±1/2±1/41500ns6002505008nsclockperiodsUNITLSBLSBLSBtdidistconv§All parameters are measured under open-loop conditions with zero common-mode input voltage. For conditions shown as MIN or MAX, use theappropriate value specified under recommended operating conditions.NOTES:5. Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors.6. The most significant-bit-first data is output directly from the comparator and therefore requires additional delay to allow for comparator responsetime. Least-significant-bit-first data applies only to ADC0832.POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443••5SLAS006 – AUGUST 1985 – REVISED JUNE 1986ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL PARAMETER MEASUREMENT INFORMATIONVCC CLK50%tsu50%GNDtsuVCCVCCCLK50%GNDtpdVCC0.4 V0.4 VVOHDO50%VOLGNDCS0.4 Vth2 VDI2 VthGNDFigure 1. ADC0832 Data Input TimingFigure 2. Data Output TimingVCCTestPointS1RLFrom OutputUnder TestCL(see Note A)S2LOAD CIRCUITtrCS50%90%10%tdisDO and SARSOutputS1 openS2 closed90%VCCGNDDO and SARSOutputS1 openS2 closedVCCGNDCS50%tr90%10%tdis–VCC10%GNDVCCGNDVOLTAGE WAVEFORMSNOTE A: CL includes probe and jig capacitance.VOLTAGE WAVEFORMSFigure 3. Output Disable Time Test Circuit and Voltage Waveforms6POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443•• ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL SLAS006 – AUGUST 1985 – REVISED JUNE 1986TYPICAL CHARACTERISTICSUNADJUSTED OFFSET ERRORvsREFERENCE VOLTAGE16VI+ = VI– = 0 V141.2512Linearity Error – LSBOffset Error – LSB10864200.010.251.01.5VCC = 5 Vfclock = 250 kHzTA = 25°CLINEARITY ERRORvsREFERENCE VOLTAGE0.750.50.11.0100012345Vref – Reference Voltage – VVref – Reference Voltage – VFigure 4Figure 5LINEARITY ERRORvsFREE-AIR TEMPERATURE0.5Vref = 5 Vfclock = 250 kHz0.45Linearity Error – LSB3LINEARITY ERRORvsCLOCK FREQUENCYVref = 5 VVCC = 5 V2.5Linearity Error – LSB20.41.585°C1–40°C25°C0.350.30.50.25–50–25025507510000100200300400500600TA – Free-Air Tempertature – °Cfclock – Clock Frequency – kHzFigure 6Figure 7POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443••7SLAS006 – AUGUST 1985 – REVISED JUNE 1986ADC0831A, ADC0832A, ADC0831B, ADC0832BA/D PERIPHERALS WITH SERIAL CONTROL ADC0831ADC0831 SUPPLY CURRENTvsFREE-AIR TEMPERATURE1.5fclock = 250 kHzCS = HighICC– Supply Current – mAVCC = 5.5 VICC– Supply Current – mA1.5VCC = 5 VTA = 25°CSUPPLY CURRENTvsCLOCK FREQUENCY11VCC = 5 VVCC = 4.5 V0.50.5–50–25025507510000100200300400500TA – Free-Air Temperature — °Cfclock – Clock Frequency – kHzFigure 8OUTPUT CURRENTvsFREE-AIR TEMPERATURE25VCC = 5 V20IO– Output Current – mAIOL (VOL = 5 V)15–IOH (VOH = 0 V)10–IOH (VOH = 2.4 V)Figure 95IOL (VOL = 0.4 V)0–50–250255075100TA – Free-Air Temperature – °CFigure 108POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443••IMPORTANT NOTICE
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