GENERAL DESCRIPTION

The AD7679 is an 18-bit, 570 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a single 5 V power supply. The part contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports.

The part is available in a 48-lead LQFP or 48-lead LFCSP with operation specified from –40°C to +85°C.

FEATURES

18-bit resolution with no missing codes

No pipeline delay (SAR architecture)

Differential input range: ±VREF (VREF up to 5 V)

Throughput: 570 kSPS

INL: ±2.5 LSB max (±9.5 ppm of full scale)

Dynamic range : 103 dB typ (VREF = 5 V)

S/(N+D): 100 dB typ @ 2 kHz (VREF = 5 V)

Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface

SPI?/QSPI?/MICROWIRE?/DSP compatible

On-board reference buffer

Single 5 V supply operation

Power dissipation: 76 mW @ 500 kSPS

150 μW @ 1 kSPS

48-lead LQFP or 48-lead LFCSP package

Pin-to-pin compatible upgrade of AD7674/AD7676/AD7678

APPLICATIONS

CT scanners

High dynamic data acquisition

Geophone and hydrophone sensors

Σ-Δ replacement (low power, multichannel)

Instrumentation

Spectrum analysis

Medical instruments