GENERAL DESCRIPTION

The AD7870A is a fast, complete, 12-bit A/D converter. It consists of a track/hold amplifier, 8 µs successive approximation ADC, 3 V buried Zener reference and versatile interface logic. The ADC features a self-contained internal clock that is laser trimmed to guarantee accurate control of conversion time. No external clock timing components are required; the on-chip clock may be overridden by an external clock if required.

FEATURES

Complete Monolithic 12-Bit ADC with:

2 μs Track/Hold Amplifier

8 μs A/D Converter

On-Chip Reference

Laser-Trimmed Clock

Parallel, Byte and Serial Digital Interface

70 dB SNR at 10 kHz Input Frequency

57 ns Data Access Time

Low Power—60 mW typ

APPLICATIONS

Digital Signal Processing

Speech Recognition and Synthesis

Spectrum Analysis

High Speed Modems

DSP Servo Control