SNAS535H – OCTOBER 1999 – REVISED MARCH 2013
ADC0808/ADC0809 8-Bit
μP
Compatible A/D Converters with 8-Channel Multiplexer
Check for Samples:
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FEATURES
Easy Interface to All Microprocessors
Operates Ratiometrically or with 5 V
DC
or
Analog Span Adjusted Voltage Reference
No Zero or Full-Scale Adjust Required
8-Channel Multiplexer with Address Logic
0V to V
CC
Input Range
Outputs meet TTL Voltage Level Specifications
ADC0808 Equivalent to MM74C949
ADC0809 Equivalent to MM74C949-1
DESCRIPTION
The ADC0808, ADC0809 data acquisition component
is a monolithic CMOS device with an 8-bit analog-to-
digital
converter,
8-channel
multiplexer
and
microprocessor compatible control logic. The 8-bit
A/D converter uses successive approximation as the
conversion technique. The converter features a high
impedance chopper stabilized comparator, a 256R
voltage divider with analog switch tree and a
successive approximation register. The 8-channel
multiplexer can directly access any of 8-single-ended
analog signals.
The device eliminates the need for external zero and
full-scale
adjustments.
Easy
interfacing
to
microprocessors is provided by the latched and
decoded multiplexer address inputs and latched TTL
TRI-STATE outputs.
The design of the ADC0808, ADC0809 has been
optimized by incorporating the most desirable aspects
of several A/D conversion techniques. The ADC0808,
ADC0809 offers high speed, high accuracy, minimal
temperature
dependence,
excellent
long-term
accuracy and repeatability, and consumes minimal
power. These features make this device ideally suited
to applications from process and machine control to
consumer and automotive applications. For 16-
channel multiplexer with common output (sample/hold
port) see ADC0816 data sheet. (See AN-247
(Literature Number
for more information.)
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KEY SPECIFICATIONS
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Resolution: 8 Bits
Total Unadjusted Error: ±½ LSB and ±1 LSB
Single Supply: 5 VDC
Low Power: 15 mW
Conversion Time: 100
μs
Block Diagram
Connection Diagrams
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 1999–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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