ADC0808_07 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 8-Bit uP Compatible A/D Converters with 8-Channel Multiplexer

March 2007
ADC0808/ADC0809
8-Bit μP Compatible A/D Converters with 8-Channel
Multiplexer
General Description
The ADC0808, ADC0809 data acquisition component is a
monolithic CMOS device with an 8-bit analog-to-digital con-
verter, 8-channel multiplexer and microprocessor compatible
control logic. The 8-bit A/D converter uses successive ap-
proximation as the conversion technique. The converter fea-
tures a high impedance chopper stabilized comparator, a
256R voltage divider with analog switch tree and a successive
approximation register. The 8-channel multiplexer can direct-
ly 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, ex-
cellent long-term accuracy and repeatability, and consumes
minimal power. These features make this device ideally suit-
ed to applications from process and machine control to con-
sumer and automotive applications. For 16-channel multi-
plexer with common output (sample/hold port) see ADC0816
data sheet. (See AN-247 for more information.)
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}
Key Specifications
■ ^Resolution
■ ^{Total Unadjusted Error}
■ ^{Single Supply}
■ ^{Low Power}
■ ^{Conversion Time}
8 Bits
±½ LSB and ±1 LSB
5 V_DC
15 mW
100 μs
Block Diagram
See Ordering
Information
© 2007 National Semiconductor Corporation 5672
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