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ADC0808CCN-ADC0809CCV
8-bit Microprocessor Compatible A/D Converters With 8-Channel Multiplexer
ADC0808/ADC0809
8-Bit µP Compatible A/D Converters with 8-Channel
Multiplexer
General DescriptionThe ADC0808, ADC0809 data acquisition componentisa
monolithic CMOS device withan 8-bit analog-to-digital con-
verter, 8-channel multiplexer and microprocessor compatible
control logic. The 8-bit A/D converter uses successive ap-
proximationasthe conversion technique. The converter fea-
turesa high impedance chopper stabilized comparator,a
256R voltage divider with analog switch tree anda succes-
sive approximation register. The 8-channel multiplexer can
directly access anyof 8-single-ended analog signals.
The device eliminates the need for external zero and
full-scale adjustments. Easy interfacingto microprocessors providedbythe latched and decoded multiplexer address
inputs and latched TTL TRI-STATE outputs.
The designofthe ADC0808, ADC0809 has been optimized incorporating the most desirable aspectsof several A/D
conversion techniques. The ADC0808, ADC0809 offers high
speed, high accuracy, minimal temperature dependence,
excellent long-term accuracy and repeatability, and con-
sumes minimal power. These features make this device
ideally suitedto applications from process and machine
controlto consumer and automotive applications. For
16-channel multiplexer with common output (sample/hold
port) see ADC0816 data sheet. (See AN-247for more infor-
mation.)
Features Easy interfacetoall microprocessors Operates ratiometricallyor with5 VDCor analog span
adjusted voltage reference No zeroor full-scale adjust required 8-channel multiplexer with address logic0Vto5V input range with single5V power supply Outputs meet TTL voltage level specifications ADC0808 equivalentto MM74C949 ADC0809 equivalentto 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 100µs
Block DiagramSee Ordering
Information
October 2002
ADC0808/ADC0809
8-Bit
Compatible
A/D
Converters
with
8-Channel
Multiplexer
