National Semiconductor ADC0808 ADC0809 8-Bit µP-Compatible AD Converters with 8-Channel Multiplexer
Summary
The ADC0808/ADC0809 is a highly reliable 8-bit Analog-to-Digital Converter featuring an integrated 8-channel multiplexer. Designed for direct compatibility with microprocessors and operating on a single 5V supply, it accurately captures multiple analog signals at low power consumption. This manual details the device's specifications, including its high resolution, fast conversion time (100μs), and suitability for various environments. It is ideally suited for demanding applications in process control, machine monitoring, robotics, and automotive systems requiring precise signal acquisition.
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0808/A 8-B it µP om patible /D onverters ith 8-C hannel M ultiplexer
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ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel Multiplexer General Description Features
The ADC0808, ADC0809 data acquisition component is Easy interface to all microprocessors
monolithic CMOS device with an 8-bit analog-to-digital con- Operates ratiometrically or with VDC or analog span verter, 8-channel multiplexer and microprocessor compatible adjusted voltage reference control logic. The 8-bit A/D converter uses successive ap- No zero or full-scale adjust required proximation as the conversion technique. The converter fea- 8-channel multiplexer with address logic tures high impedance chopper stabilized comparator,
0V to 5V input range with single 5V power supply
256R voltage divider with analog switch tree and succes-
Outputs meet TTL voltage level specifications
sive approximation register. The 8-channel multiplexer can
Standard hermetic or molded 28-pin DIP package
directly access any of 8-single-ended analog signals.
28-pin molded chip carrier package
The device eliminates the need for external zero and
ADC0808 equivalent to MM74C949
full-scale adjustments. Easy interfacing to microprocessors
ADC0809 equivalent to MM74C949-1
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 Key Specifications
by incorporating the most desirable aspects of several A/D Resolution Bits conversion techniques. The ADC0808, ADC0809 offers high Total Unadjusted Error ±1⁄2 LSB and ±1 LSB speed, high accuracy, minimal temperature dependence, ex- Single Supply VDC cellent long-term accuracy and repeatability, and consumes
Low Power m W
minimal power. These features make this device ideally
Conversion Time µs
suited to applications from process and machine control to consumer and automotive applications. For 16-channel mul- tiplexer with common output (sample/hold port) see ADC0816 data sheet. (See AN-247 for more information.)
Block Diagram
DS005672-1
See Ordering Information
TRI-STATE® is registered trademark of National Semiconductor Corp.
National Semiconductor Corporation DS005672 www.national.com
Page Summary Contents For National Semiconductor ADC0808 ADC0809 8-Bit µP-Compatible AD Converters with 8-Channel Multiplexer
Manual Details
| Brand | National |
|---|---|
| Pages | 14 |
| File Size | 272.44 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What conversion type and resolution does this component offer?
It is an 8-bit Analog-to-Digital Converter with an integrated 8-channel multiplexer capability.
Does the device require external zero or full-scale adjustments?
No, the design eliminates the need for external zero and full-scale adjustments, simplifying interfacing.
What operating voltage does the ADC require?
The device operates optimally with a single 5 V DC power supply.
Can this converter be used in life support systems?
No; it is not authorized for use as a critical component in life support devices without express written approval.