AD7870 Datasheet

• 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
• 57 ns Data Access Time
• 72 dB SNR at 10 kHz Input Frequency (AD7870)
• Low Power: –60 mW typ
• Variety of Input Ranges:
  ±3 V for AD7870

The AD7870 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 which is laser trimmed to guarantee accurate control of conversion time. No external clock timing components are required; the on-chip clock may he overridden by an external clock if required.

The parts offer 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.

All parts operate from ±5 V power supplies. The AD7870 accept input signal ranges of ±3 V and ±10 V, respectively. The parts can convert full power signals up to 50 kHz.

The AD7870 feature dc accuracy specifications such as linearity, full-scale and offset error. In addition, the AD7870 are fully specified for dynamic performance parameters including distortion and signal-to-noise ratio.

The parts are available in a 24-pin, 0.3 inch-wide, plastic or hermetic dual-in-line package (DIP). The AD7870 are available in a 28-pin plastic leaded chip carrier (PLCC).