AD7870A

The AD7870A is a fast, complete, 12-bit A/D converter. It consists of a track/hold amplifier, 8 ms 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.

AD7870A offers a choice of three data output formats: a single, parallel, 12-bit word, two 8-bit bytes or serial data. Fast bus access times and standard control inputs ensure easy interfacing to modern microprocessors and digital signal processors.

The AD7870A operates from ±5 V power supplies, accepts bipolar input signals of ±3 V and can convert full power signals up to 50 kHz.

In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7870A is also fully specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.

The AD7870A is fabricated in Analog Devices' linear compatible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin, 0.3-inch wide, plastic dual inline package (DIP).