ANALOG DEVICES AD7655 Data Sheet

Low Cost, 4-Channel, 16-Bit 1 MSPS

Pul SAR® ADC

AD7655 FEATURES FUNCTIONAL BLOCK DIAGRAM

4-channel, 16-bit resolution ADC AVDD AGND REFx REFGND DGNDDVDD

2 track-and-hold amplifiers

TRACK/HOLD OVDD ×2

Throughput INA1 SERIAL

INAN MUX PORT

1 MSPS (normal mode)

888 k SPS (impulse mode)

MUX SWITCHED

A0 SER/PAR

CAP DAC

Analog input voltage range: 0 V to 5 V

No pipeline delay INBN MUX

Parallel and serial 5 V/3 V interface CLOCK PARALLEL

PD CS

INTERFACE

SPI®/QSPI™/MICROWIRE™/DSP compatible CONTROL LOGIC AND

RESET CALIBRATION CIRCUITRY

Single 5 V supply operation A/B

Power dissipation AD7655 BYTESWAP

120 m W typical

IMPULSE CNVST

2.6 m W @ 10 k SPS Package Figure 1. 48-lead quad flat package (LQFP)

Table 1. Pul SAR Selection

48-lead frame chip scale package (LFCSP)

800 to

Pin-to-pin compatible with the AD7654

Type/k SPS 100 to 250 500 to 570 >1000

Low cost

Pseudo AD7660/ AD7650/ AD7653

Differential AD7661 AD7652 AD7667

APPLICATIONS AD7664/ AD7666

AC motor control

True Bipolar AD7663 AD7665 AD7671

3-phase power control

True AD7621

4-channel data acquisition

Differential AD7675 AD7676 AD7677 AD7623

Uninterrupted power supplies

Communications 18 Bit AD7678 AD7679 AD7674 AD7641

Multichannel/ AD7654 AD7655

Simultaneous

GENERAL DESCRIPTION PRODUCT HIGHLIGHTS

The AD7655 is a low cost, simultaneous sampling, dual- 1. Multichannel ADC. channel, 16-bit, charge redistribution SAR, analog-to-digital The AD7655 features 4-channel inputs with two sample- converter that operates from a single 5 V power supply. It and-hold circuits that allow simultaneous sampling.

contains two low noise, wide bandwidth, track-and-hold 2. Fast Throughput.

amplifiers that allow simultaneous sampling, a high speed The AD7655 is a 1 MSPS, charge redistribution, 16-bit SAR 16-bit sampling ADC, an internal conversion clock, error ADC with internal error correction circuitry. correction circuits, and both serial and parallel system interface

3. Single-Supply Operation.

ports. Each track-and-hold has a multiplexer in front to provide

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

a 4-channel input ADC. The A0 multiplexer control input

mode, its power dissipation decreases with throughput.

allows the choice of simultaneously sampling input pairs

INA1/INB1 (A0 = low) or INA2/INB2 (A0 = high). The part 4. Serial or Parallel Interface. features a very high sampling rate mode (normal) and, for low Versatile parallel or 2-wire serial interface arrangements power applications, a reduced power mode (impulse) where the are compatible with both 3 V and 5 V logic.

power is scaled with the throughput. Operation is specified from −40°C to +85°C. Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.