ADC0804 - 6-5SemiconductorFeatures 80C48 and 80C80/85 Bus...

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Unformatted text preview: 6-5SemiconductorFeatures 80C48 and 80C80/85 Bus Compatible - No InterfacingLogic Required Conversion Time < 100s Easy Interface to Most Microprocessors Will Operate in a Stand Alone Mode Differential Analog Voltage Inputs Works with Bandgap Voltage References TTL Compatible Inputs and Outputs On-Chip Clock Generator 0V to 5V Analog Voltage Input Range (Single + 5V Supply) No Zero-Adjust RequiredDescriptionThe ADC0802 family are CMOS 8-Bit, successive-approxi-mation A/D converters which use a modified potentiometricladder and are designed to operate with the 8080A controlbus via three-state outputs. These converters appear to theprocessor as memory locations or I/O ports, and hence nointerfacing logic is required.The differential analog voltage input has good common-mode-rejection and permits offsetting the analog zero-input-voltage value. In addition, the voltage reference input can beadjusted to allow encoding any smaller analog voltage spanto the full 8 bits of resolution.Ordering InformationPART NUMBERERROREXTERNAL CONDITIONSTEMP. RANGE (oC)PACKAGEPKG. NOADC0802LCN1/2LSBVREF/2 = 2.500VDC(No Adjustments)0 to 7020 Ld PDIPE20.3ADC0802LCD3/4LSB-40 to 8520 Ld CERDIPF20.3ADC0802LD1 LSB-55 to 12520 Ld CERDIPF20.3ADC0803LCN1/2LSBVREF/2 Adjusted for Correct Full ScaleReading0 to 7020 Ld PDIPE20.3ADC0803LCD3/4LSB-40 to 8520 Ld CERDIPF20.3ADC0803LCWM1 LSB-40 to 8520 Ld SOICM20.3ADC0803LD1 LSB-55 to 12520 Ld CERDIPF20.3ADC0804LCN1 LSBVREF/2 = 2.500VDC(No Adjustments)0 to 7020 Ld PDIPE20.3ADC0804LCD1 LSB-40 to 8520 Ld CERDIPF20.3ADC0804LCWM1 LSB-40 to 8520 Ld SOICM20.3PinoutADC0802, ADC0803, ADC0804(PDIP, CERDIP)TOP VIEWTypical Application Schematic1112131415161718201910987654321WRRDCSCLK ININTRVIN(-)VIN(+)DGNDVREF/2AGNDV+ OR VREFCLK RDB0 (LSB)DB1DB2DB3DB4DB5DB6DB7 (MSB)3211211515141318171676109841920WRRDCSDB6DB7INTRDB3DB4DB5DBDB1DB2CLK INCLK RV+VIN(-)VIN(+)DGNDVREF/2AGNDANYPROCESSOR8-BIT RESOLUTIONOVER ANYDESIREDANALOG INPUTVOLTAGE RANGEDIFFINPUTS10K150pFVREF/2P BUS+5VAugust 1997CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.Copyright Harris Corporation 1997ADC0802, ADC0803ADC08048-Bit, Microprocessor-Compatible, A/D ConvertersFile Number3094.16-6Functional Diagram1211151413181716WRRDCSINTRCLK OSCCLK RV+VIN(-)VIN(+)DGNDVREF/2AGND(VREF)DACVOUTCOMPCLKGENCLKSCLK ARESETSTART F/FLADDERANDDECODERSUCCESSIVEAPPROX.REGISTERAND LATCH8-BITSHIFTREGISTERDRESETSETCONV.COMPL.THREE-STATEOUTPUT LATCHESDIGITAL OUTPUTSTHREE-STATE CONTROL1 = OUTPUT ENABLEDFF2CLK AXFERG2Q8 X 1/fRQINTR F/FIF RESET = 0DDFF1QDQCLK BSTARTCONVERSIONMSBLSBQ1 = RESET SHIFT REGISTER0 = BUSY AND RESET STATERESETREADSET321576109841920CLK INMSBG1CLK-+LSBINPUT PROTECTIONFOR ALL LOGIC INPUTSINPUTTO INTERNALBV = 30VCIRCUITSV++-ADC0802, ADC0803, ADC08046-7Absolute Maximum RatingsThermal InformationSupply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5VSupply Voltage ....
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This note was uploaded on 04/05/2010 for the course ECEC 304 taught by Professor Peters during the Summer '09 term at Drexel.

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ADC0804 - 6-5SemiconductorFeatures 80C48 and 80C80/85 Bus...

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