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AD7650

REV. 0

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

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© Analog Devices, Inc., 2002

16-Bit, 570 kSPS

Low Cost CMOS ADC

FUNCTIONAL BLOCK DIAGRAM

SWITCHED

CAP DAC

16

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7650

DATA[15:0]

BUSY

RD

CS

SER/

PAR

OB/

2C

OGND

OVDD

DGND

DVDD

AVDD AGND REF REFGND

IN+

IN–

PD

RESET

SERIAL

PORT

PARALLEL

INTERFACE

CNVST

WARP

IMPULSE

FEATURES

Throughput

570 kSPS (Warp Mode)

500 kSPS (Normal Mode)

16 Bits Resolution

Analog Input Voltage Range: 0 V to 2.5 V

No Pipeline Delay

Parallel and Serial 5 V/3 V Interface

SPI™/QSPI™/MICROWIRE™/DSP Compatible

Single 5 V Supply Operation

Power Dissipation

77 mW Typical @ 444 kSPS (Impulse Mode)

21

W @ 100 SPS

Power-Down Mode: 7

W Max

Package: 48-Lead Quad Flat Pack (LQFP) or 48-Lead

Frame Chip-Scale Pack (LFCSP)

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 AD7650 is a 16-bit, 570 kSPS, 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,

an internal conversion clock, error correction circuits, and both

serial and parallel system interface ports.

It features a very high sampling rate mode (Warp) and, for

asynchronous conversion rate applications, a fast mode (Normal)

and, for low power applications, a reduced power mode (Impulse)

where the power is scaled with the throughput.

It is fabricated using Analog Devices’ high-performance,

0.6 micron CMOS process and is available in a 48-lead LQFP

or in a tiny 48-lead Chip Scale package with operation specified

from –40

°C to +85°C.

PRODUCT HIGHLIGHTS

1. Fast Throughput

The AD7650 is a 570 kSPS, charge redistribution, 16-bit

SAR ADC.

2. Single-Supply Operation

The AD7650 operates from a single 5 V supply. In impulse

mode, its power dissipation decreases with the throughput from

77 mW at 444 kSPS throughput to, for instance, only 21

µW

at a 100 SPS throughput. It consumes 7

µW maximum when

in power-down.

3. Serial or Parallel Interface

Versatile parallel or 2-wire serial interface arrangement com-

patible with both 3 V or 5 V logic.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.