16-Bit 1 MSPS PulSAR

Unipolar ADC with Reference

Data Sheet

AD7653

Rev. C

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FEATURES

Throughput:

1 MSPS (Warp mode)

800 kSPS (Normal mode)

666 kSPS (Impulse mode)

16-bit resolution

Analog input voltage range: 0 V to 2.5 V

No pipeline delay

Parallel and serial 5 V/3 V interface

Single 5 V supply operation

Power dissipation

92 mW typ @ 666 kSPS, 138 µW @ 1 kSPS without REF

128 mW typ @ 1 MSPS with REF

48-lead LQFP and 48-lead LFCSP packages

Pin-to-pin compatible with PulSAR ADCs

APPLICATIONS

Data acquisition

Instrumentation

Digital signal processing

Spectrum analysis

Medical instruments

Battery-powered systems

Process control

GENERAL DESCRIPTION

The AD7653 is a 16-bit, 1 MSPS, charge redistribution SAR

analog-to-digital converter that operates from a single 5 V

power supply. The part contains a high speed 16-bit sampling

ADC, internal conversion clock, internal reference, error

correction circuits, and both serial and parallel system interface

ports. It features a very high sampling rate mode (Warp), a fast

mode (Normal) for asynchronous conversion rate applications,

and a reduced power mode (Impulse) for low power applica-

tions where power is scaled with the throughput. The AD7653

is fabricated using Analog Devices’ high performance, 0.6

micron CMOS process, with correspondingly low cost. It is

available in a 48-lead LQFP and a tiny 48-lead LFCSP with

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

FUNCTIONAL BLOCK DIAGRAM

02966-0-001

SWITCHED

CAP DAC

16

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7653

DATA[15:0]

BUSY

RD

CS

SER/PAR

OB/2C

OGND

OVDD

DGND

DVDD

AVDD

AGND

REF REFGND

IN

INGND

PD

RESET

SERIAL

PORT

PARALLEL

INTERFACE

CNVST

WARP IMPULSE

REF

REFBUFIN

PDBUF

PDREF

BYTESWAP

Figure 1.

Table 1. PulSAR™ Selection

Type/kSPS

100–250

500–570

800–

1000

Pseudo-

Differential

AD7651

AD7660/AD7661

AD7650/AD7652

AD7664/AD7666

AD7653

AD7667

True Bipolar

AD7663

AD7666

AD7671

True

Differential

AD7675

AD7676

AD7677

18-Bit

AD7678

AD7679

AD7674

Multichannel/

Simultaneous

AD7654

AD7655

PRODUCT HIGHTLIGHTS

1. Fast Throughput.

The AD7653 is a 1 MSPS, charge redistribution, 16-bit SAR

ADC with internal error correction circuitry.

2. Internal Reference.

The AD7653 has an internal reference with a typical

temperature drift of 7 ppm/°C.

3. Single-Supply Operation.

The AD7653 operates from a single 5 V supply. In Impulse

mode, its power dissipation decreases with the throughput.

4. Serial or Parallel Interface.

Versatile parallel or 2-wire serial interface arrangement is

compatible with both 3 V and 5 V logic.