ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel Multiplexer

Features

n Easy interface to all microprocessors

n Operates ratiometrically or with 5 VDC or analog span adjusted voltage reference

n No zero or full-scale adjust required

n 8-channel multiplexer with address logic

n 0V to 5V input range with single 5V power supply

n Outputs meet TTL voltage level specifications

n Standard hermetic or molded 28-pin DIP package

n 28-pin molded chip carrier package

n ADC0808 equivalent to MM74C949

n ADC0809 equivalent to MM74C949-1

Key Specifications

n Resolution: 8 Bits

n Total Unadjusted Error: ±1⁄2 LSB and ±1 LSB

n Single Supply: 5 VDC

n Low Power: 15 mW

n Conversion Time: 100 µs

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage (VCC) (Note 3) 6.5V

Voltage at Any Pin −0.3V to (VCC+0.3V) E

xcept 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 TA=25˚C 875 mW

Lead Temp. (Soldering, 10 seconds) Dual-In-Line Package (plastic) 260˚C

Dual-In-Line Package (ceramic) 300˚C

Molded Chip Carrier Package Vapor Phase (60 seconds) 215˚C

Infrared (15 seconds) 220˚C

ESD Susceptibility (Note 8) 400V

Operating Conditions (Notes 1, 2) Temperature Range (Note 1) TMIN≤TA≤TMAX

ADC0808CJ −55˚C≤TA≤+125˚C ADC0808CCJ, ADC0808CCN, ADC0809CCN −40˚C≤TA≤+85˚C ADC0808CCV, ADC0809CCV −40˚C ≤ TA ≤ +85˚C Range of VCC (Note 1) 4.5 VDC to 6.0 VDC

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.

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.)

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