GENERAL DESCRIPTION

The AD7655 is a low cost, simultaneous sampling, dual channel, 16-bit, charge redistribution SAR, analog-to-digital converter that operates from a single 5 V power supply. It contains two low noise, wide bandwidth, track-and-hold amplifiers that allow simultaneous sampling, a high speed 16-bit sampling ADC, an internal conversion clock, error correction circuits, and both serial and parallel system interface ports. Each track-and-hold has a multiplexer in front to provide a 4-channel input ADC. The A0 multiplexer control input allows the choice of simultaneously sampling input pairs INA1/INB1 (A0 = low) or INA2/INB2 (A0 = high). The part features a very high sampling rate mode (normal) and, for low power applications, a reduced power mode (impulse) where the power is scaled with the throughput. Operation is specified

from −40°C to +85°C.

FEATURES

4-channel, 16-bit resolution ADC

2 track-and-hold amplifiers

Throughput

  1 MSPS (normal mode)

  888 kSPS (impulse mode)

Analog input voltage range: 0 V to 5 V

No pipeline delay

Parallel and serial 5 V/3 V interface

SPI®/QSPI™/MICROWIRE™/DSP compatible

Single 5 V supply operation

Power dissipation

  120 mW typical

  2.6 mW @ 10 kSPS

Package

  48-lead quad flat package (LQFP)

  48-lead frame chip scale package (LFCSP)

Pin-to-pin compatible with the AD7654

Low cost

APPLICATIONS

AC motor control

3-phase power control

4-channel data acquisition

Uninterrupted power supplies

Communications