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GENERAL DESCRIPTION

The AD7951 is a 14-bit, charge redistribution, successive approximation register (SAR) architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high voltage process. The device is configured through hardware or via a dedicated write only serial configuration port for input range and operating mode. The AD7951 contains a high speed 14-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports.

FEATURES

Multiple pins/software programmable input ranges:

5 V, 10 V, ±5 V, ±10 V

Pins or serial SPI? compatible input ranges/mode selection

Throughput

1 MSPS (warp mode)

800 kSPS (normal mode)

670 kSPS (impulse mode)

14-bit resolution with no missing codes

INL: ±0.3 LSB typ, ±1 LSB max (±61 ppm of FSR)

SNR: 85 dB @ 2 kHz

iCMOS? process technology

5 V internal reference: typical drift 3 ppm/°C; TEMP output

No pipeline delay (SAR architecture)

Parallel (14- or 8-bit bus) and serial 5 V/3.3 V interface

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

Power dissipation:

10 mW @ 100 kSPS

235 mW @ 1 MSPS

48-lead LQFP and LFCSP (7 mm × 7 mm) packages

APPLICATIONS

Process control

Medical instruments

High speed data acquisition

Digital signal processing

Instrumentation

Spectrum analysis

ATE