Low Cost, 4-Channel, 16-Bit, 500 kSPS PulSAR ADC

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.

PRODUCT HIGHLIGHTS

* Multichannel ADC.

The AD7655 features 4-channel inputs with two

sample-and-hold circuits that allow simultaneous sampling.

* Fast Throughput.

The AD7655 is a 500 kSPS, charge redistribution, 16-bit SAR

ADC with internal error correction circuitry.

* Single-Supply Operation.

The AD7655 operates from a single 5 V supply. In impulse

mode, its power dissipation decreases with throughput.

* Serial or Parallel Interface.

Versatile parallel or 2-wire serial interface arrangements

are compatible with both 3 V and 5 V logic.

APPLICATIONS

* AC motor control

* 3-phase power control

* 4-channel data acquisition

* Uninterrupted power supplies

* Communications

* 4-channel, 16-bit resolution ADC

* 2 track-and-hold amplifiers

* Throughput

* 500 kSPS (normal mode)

* 444 kSPS (impulse mode)

* Analog input voltage range: 0 V to 5 V

* No pipeline delay

* Parallel and serial 5 V/3 V interface

* Refer to data sheet for additional features