Dual, 2-Channel, Simultaneous Sampling, PulSAR®, 500 kSPS, 16-Bit ADC

The AD7654 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 device 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.

APPLICATIONS

* AC motor control

* 3-phase power control

* 4-channel data acquisition

* Uninterrupted power supplies

* Communications

PRODUCT HIGHLIGHTS

* Simultaneous Sampling.

The AD7654 features two sample-and-hold circuits that

allow simultaneous sampling. It provides inputs for four

channels.

* Fast Throughput.

The AD7654 is a 500 kSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

* Superior INL and No Missing Codes.

The AD7654 has a maximum integral nonlinearity of

3.5 LSB with no missing 16-bit codes.

* Single-Supply Operation.

The AD7654 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 arrangement is

compatible with both 3 V and 5 V logic.

* Dual, 16-bit, 2-channel simultaneous sampling ADC

* 16-bit resolution with no missing codes

* Throughput:

500 kSPS (normal mode)

444 kSPS (impulse mode)

* INL: ±3.5 LSB max (±0.0053% of full scale)

* SNR: 89 dB typ at 100 kHz