AD7622

Rev. 0

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FEATURES

Throughput

2 MSPS (wideband warp and warp mode)

1.5 MSPS (normal mode)

INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm of FSR)

16-bit resolution with no missing codes

Dynamic range: 92.5 dB typical

2.048 V internal reference: typical drift 8 ppm/°C; TEMP output

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

Single 2.5 V supply operation

Power dissipation

70 mW typical @ 2 MSPS with internal REF

2 μW in power-down mode

Pb-free, 48-lead LQFP and 48-lead LFCSP_VQ

Pin compatible with other PulSAR 48-lead ADCs

APPLICATIONS

Medical instruments

High speed data acquisition/high dynamic data acquisition

Digital signal processing

Spectrum analysis

Instrumentation

Communications

ATE

GENERAL DESCRIPTION

The AD7622 is a 16-bit, 2 MSPS, charge redistribution SAR,

fully differential, analog-to-digital converter (ADC) that

operates from a single 2.5 V power supply. The part 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) and

a fast mode (normal) for asynchronous rate applications. The

AD7622 is hardware factory calibrated and tested to ensure ac

parameters, such as signal-to-noise ratio (SNR), in addition to

the more traditional dc parameters of gain, offset, and linearity.

The AD7622 is available in Pb-free only packages with

operation specified from −40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

16

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7622

DGND

DVDD

AVDD

AGND

REF REFGND

IN+

IN–

PD

RESET

CNVST

PDBUF

REFBUFIN

PDREF

REF

TEMP

D[15:0]

RD

CS

BYTESWAP

OGND

OVDD

BUSY

SER/PAR

REF AMP

NORMAL

SERIAL

PORT

PARALLEL

INTERFACE

SWITCHED

CAP DAC

WARP

OB/2C

Figure 1.

Table 1. PulSAR 48-Lead ADC Selection

Type/kSPS

100 to

250

500 to

570

650 to

1000

>1000

Pseudo

Differential

AD7651,

AD7660,

AD7661

AD7650,

AD7652,

AD7664,

AD7666

AD7653,

AD7667

True Bipolar

AD7610,

AD7663

AD7665

AD7612,

AD7671

True

Differential

AD7675

AD7676

AD7677

AD7621,

AD7622,

AD7623

18-Bit

Multichannel/

AD7631,

AD7678

AD7679

AD7634,

AD7674

AD7641,

AD7643

Simultaneous

AD7654

AD7655

1.50

–0.50

0

0.50

1.00

–1.50

–1.00

0

16384

32768

49152

65536

CODE

POSITIVE INL = +0.43 LSB

NEGATIVE INL = –0.49 LSB

Figure 2. Integral Nonlinearity vs. Code