14-Bit, 1 MSPS, Unipolar/Bipolar

Data Sheet

AD7951

Rev. A

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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

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. A falling edge on CNVST

samples the analog input on IN+ with respect to a ground

sense, IN−. The AD7951 features four different analog input

ranges and three different sampling modes: warp mode for the

fastest throughput, normal mode for the fastest asynchronous

throughput, and impulse mode where power is scaled with

throughput. Operation is specified from −40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

14

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7951

DGND

DVDD

AVDD

AGND

REF REFGND

IN+

PD

RESET

CNVST

PDBUF

REFBUFIN

PDREF

REF

TEMP

D[13:0]

BUSY

RD

CS

OB/2C

OGND

OVDD

BYTESWAP

SER/PAR

REF

AMP

SERIAL DATA

PORT

PARALLEL

INTERFACE

SWITCHED

CAP DAC

VCC VEE

WARP IMPULSE BIPOLAR TEN

SERIAL

CONFIGURATION

PORT

IN–

Figure 1.

Table 1. 48-Lead 14-/16-/18-Bit PulSAR Selection

Type

100 kSPS to

250 kSPS

500 kSPS to

570 kSPS

570 kSPS to

1000 kSPS

>1000

kSPS

Pseudo

Differential

AD7651

AD7660

AD7661

AD7650

AD7652

AD7664

AD7666

AD7653

AD7667

True Bipolar

AD7610

AD7663

AD7665

AD7951

AD7612

AD7671

True

Differential

AD7675

AD7676

AD7677

AD7621

AD7622

AD7623

18-Bit, True

Differential

AD7678

AD7679

AD7674

AD7641

AD7643

Multichannel/

Simultaneous

AD7654

AD7655