ADC0808

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
Standard hermetic or molded 28-pin DIP package
28-pin molded chip carrier package
ADC0808 equivalent to MM74C949
ADC0809 equivalent to MM74C949-1




Pinout






Specifications

Supply Voltage (V_CC) (Note 3)6.5V
Voltage at Any Pin−0.3V to (V_CC+0.3V)
Except Control Inputs
Voltage at Control Inputs −0.3V to +15V
(START, OE, CLOCK, ALE, ADD A, ADD B, ADD C)
Storage Temperature Range −65˚C to +150˚C
Package Dissipation at T_A=25˚C 875 mW
Lead Temp. (Soldering, 10 seconds)
Dual-In-Line Package (plastic) 260˚C

Resolution	8 bits
Input Channels	8
Interface Type	Parallel
Differential Input	No
Max KSample Rate	10 ksps
Min Supply Voltage	4.5 Volt
Max Supply Voltage	6 Volt
Reference Source	External
Temperature Min	-40 deg C
Temperature Max	85 deg C
Power Down	No
Input Sample/Hold	No
Special Features	Total unadjusted error is +/-0.75 LSB
Data Converter Type	ADC
Max Sample Rate	0.01 MSPS
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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 ap- proximation as the conversion technique. The converter ADC0808, ADC0809 features a high impedance chopper stabilized comparator, a 256R voltage divider with analog switch tree and a succes- sive 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.

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.)