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 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.

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 5V input range with single 5V power supply
* Outputs meet TTL voltage level specifications
* ADC0808 equivalent to MM74C949
* ADC0809 equivalent to MM74C949-1
Key Specifications
* Resolution 8 Bits
* Total Unadjusted Error ±1⁄2 LSB and ±1 LSB
* Single Supply 5 VDC
* Low Power 15 mW
* Conversion Time 100 µs