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GENERAL DESCRIPTION

The AD7621 is a 16-bit, 3 MSPS, charge redistribution SAR, fully differential analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. It contains a high speed 16-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. It features two very high sampling rate modes (wideband warp and warp), a fast mode (normal) for asynchronous rate applications, and a reduced power mode (impulse) for low power applications where the power is scaled with the throughput. Operation is specified from ?40°C to +85°C.

FEATURES

Throughput

3 MSPS (wideband warp and warp mode)

2 MSPS (normal mode)

1.25 MSPS (impulse mode)

2.048 V internal reference

Differential input range: ±VREF (VREF up to 2.5 V)

INL: ±2 LSB maximum, ±1 LSB typical

16-bit resolution with no missing codes

SINAD: 89 dB typical @ 100 kHz

THD: ?101 dB typical @ 100 kHz

No pipeline delay (SAR architecture)

Parallel (16- or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface

SPI?-/QSPI?-/MICROWIRE?-/DSP-compatible

2.5 V single-supply operation

Power dissipation: 65 mW typical @ 3 MSPS

48-lead LQFP and 48-lead LFCSP packages

Speed upgrade of the AD7677

APPLICATIONS

Medical instruments

High speed data acquisition

Digital signal processing

Communications

Instrumentation

Spectrum analysis

ATE