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 fullscale
adjustments. Easy interfacing to microprocessors is
provided by the latched and decoded multiplexer address
inputs and latched TTL TRI-STATEé 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 for more information.)
Features
Y Easy interface to all microprocessors
Y Operates ratiometrically or with 5 VDC or analog span
adjusted voltage reference
Y No zero or full-scale adjust required
Y 8-channel multiplexer with address logic
Y 0V to 5V input range with single 5V power supply
Y Outputs meet TTL voltage level specifications
Y Standard hermetic or molded 28-pin DIP package
Y 28-pin molded chip carrier package
Y ADC0808 equivalent to MM74C949
Y ADC0809 equivalent to MM74C949-1