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ADC0809
8-bit Microprocessor Compatible A/D Converters With 8-Channel Multiplexer
TL/H/5672
ADC0808/ADC0809
8-Bit
Compatible
A/D
Converters
with
8-Channel
Multiplexer
November 1995
ADC0808/ADC0809 8-Bit mP Compatible A/D Converters
with 8-Channel Multiplexer
General Description
The ADC0808, ADC0809 data acquisition componentisa
monolithic CMOS device withan 8-bit analog-to-digital con-
verter, 8-channel multiplexer and microprocessor compati-
ble control logic.The 8-bit A/D converter uses successive
approximationasthe conversion technique. The converter
featuresa high impedance chopperstabilized comparator,a
256R voltage dividerwith analog switch treeanda succes-
sive approximation register.The 8-channel multiplexercan
directly accessanyof 8-single-ended analog signals.
The device eliminatesthe needfor external zeroandfull-
scale adjustments. Easy interfacingto microprocessorsis
providedbythe latched and decoded multiplexer address
inputsand latched TTL TRI-STATEÉ outputs.
The designofthe ADC0808, ADC0809has been optimized incorporatingthe most desirable aspectsof several A/D
conversion techniques.TheADC0808, ADC0809 offershigh
speed, high accuracy, minimal temperature dependence,
excellent long-term accuracy and repeatability, and con-
sumes minimal power. These features makethis device
ideally suitedto applications from process and machine
controlto consumerand automotive applications.For16-
channel multiplexerwith common output (sample/hold port)
see ADC0816 data sheet. (See AN-247for more informa-
tion.)
Features Easy interfacetoall microprocessors Operates ratiometricallyor with5 VDCor analog span
adjusted voltage referenceNo zeroor full-scale adjust required 8-channel multiplexer with address logic0Vto5V input range with single5V power supply Outputs meet TTL voltage level specifications Standard hermeticor molded 28-pinDIP package 28-pin molded chip carrier package ADC0808 equivalentto MM74C949 ADC0809 equivalentto MM74C949-1
Key Specifications Resolution 8Bits Total Unadjusted Error g(/2 LSBandg1 LSB Single Supply 5 VDC Low Power 15 mW Conversion Time 100ms
Block Diagram
TL/H/5672–1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorp.
See Ordering
Information
C1996National SemiconductorCorporation RRD-B30M36/Printed inU.S.A. http://
