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ADC0804
8-Bit Microprocessor Compatible A/D Converters
TL/H/5671
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805
8-Bit
Compatible
A/D
Converters
December 1994
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805
8-Bit mP Compatible A/D Converters
General Description
The ADC0801, ADC0802, ADC0803, ADC0804 and
ADC0805are CMOS 8-bit successive approximation A/D
converters that usea differential potentiometric ladderÐ
similartothe 256R products. These convertersarede-
signedto allow operation withthe NSC800and INS8080A
derivative controlbus with TRI-STATEÉ output latchesdi-
rectly drivingthe data bus. These A/Ds appearlike memory
locationsorI/O portstothe microprocessorandno inter-
facing logicis needed.
Differential analog voltage inputs allow increasingthe com-
mon-mode rejection and offsettingthe analog zero input
voltage value.In addition,the voltage reference inputcan adjustedto allow encodingany smaller analog voltage
spantothefull8bitsof resolution.
Features Compatible with 8080mP derivativesÐno interfacing
logic needed- access time-135ns Easy interfacetoall microprocessors,or operates
‘‘stand alone’’ Differential analog voltage inputs Logic inputsand outputs meet both MOS and TTL volt-
age level specifications Works with 2.5V (LM336) voltage reference On-chip clock generator0Vto5V analog input voltage range with single5V
supplyNo zero adjust required 0.3× standard width 20-pinDIP package 20-pin molded chip carrieror small outline package Operates ratiometricallyor with5 VDC,2.5 VDC,or ana-
log span adjusted voltage reference
Key Specifications Resolution 8bits Total error g(/4 LSB, g(/2 LSBandg1 LSB Conversion time 100ms
Typical Applications
TL/H/5671–1
8080 Interface
TL/H/5671–31
Error Specification (IncludesFull-Scale,
ZeroError,andNon-Linearity)
Part Full- VREF/2e2.500 VDC VREF/2eNo Connection
Number Scale (No Adjustments) (NoAdjustments)Adjusted
ADC0801 g(/4 LSB
ADC0802 g(/2 LSB
ADC0803 g(/2 LSB
ADC0804 g1LSB
ADC0805 g1 LSB
TRI-STATEÉisaregistered trademarkof National SemiconductorCorp.
Z-80Éis aregistered trademark ofZilogCorp.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
