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