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National Semiconductor - 8-Bit uP Compatible A/D Converters with 8-Channel Multiplexer

Numéro de référence ADC0808
Description 8-Bit uP Compatible A/D Converters with 8-Channel Multiplexer
Fabricant National Semiconductor 
Logo National Semiconductor 





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ADC0808 fiche technique
ADC0808/ADC0809
July 8, 2009
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 VDC or analog span
adjusted voltage reference
No zero or full-scale adjust required
8-channel multiplexer with address logic
0V to VCC 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 VDC
15 mW
100 μs
Block Diagram
See Ordering Information
© 2009 National Semiconductor Corporation 5672
567201
www.national.com

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