REV. PrA

Preliminary Technical Data

PRELIMINARY TECHNICAL DATA

Information furnished by Analog Devices is believed to be accurate and

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

under any patent or patent rights of Analog Devices.

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© Analog Devices, Inc., 2002

16-Bit 1 MSPS SAR Unipolar ADC with Ref

FUNCTIONAL

BLOCK

DIAGRAM

SWITCHED

CAP DAC

16

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7667

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

2.5 V REF

PDREF

PDBUF

REFBUFIN

BYTESWAP

FEATURES

Throughput:

1 MSPS (Warp Mode)

800 kSPS (Normal Mode)

INL: ±2.5 LSB Max (±0.0038% of Full Scale)

16 Bits Resolution with No Missing Codes

Analog Input Voltage Range: 0 V to 2.5 V

No Pipeline Delay

Parallel and Serial 5 V/3 V Interface

SPI

Single 5 V Supply Operation

Power Dissipation

112 mW Typ without REF, 122 mW Typ with REF

15

W @ 100 SPS

Power-Down Mode: 7

W Max

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

48-Lead Chip Scale Package (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 AD7667 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, an internal conversion clock, internal reference, error

correction circuits, and both serial and parallel system inter-

face 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 through-

put.

It is fabricated using Analog Devices’ high-performance, 0.6 micron

CMOS process, with correspondingly low cost and is available in a

48-lead LQFP and a tiny 48-lead LFCSP with operation speci-

fied from –40°C to +85°C.

PRODUCT HIGHLIGHTS

1. Fast Throughput

The AD7667 is a 1 MSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

2. Internal Reference

The AD7667 has an internal reference and allows for an

external reference to be used.

3. Superior INL

The AD7667 has a maximum integral nonlinearity of 2.5

LSB with no missing 16-bit code.

4. Single-Supply Operation

The AD7667 operates from a single 5 V supply and dissipates

a typical of 112 mW. In impulse mode, its power dissi-

pation decreases with the throughput. It consumes 7 µW

maximum when in power-down.

5. Serial or Parallel Interface

Versatile parallel or 2-wire serial interface arrangement

compatible with both 3 V or 5 V logic.

*Patent pending.

SPI and QSPI are trademarks of Motorola Inc.

MICROWIRE ia a trademark of National Semiconductor Corporation

Pseudo

AD7651

AD7650/52

AD7653

Differential

AD7660/61

AD7664/66

AD7667

True Bipolar

AD7663

AD7665

AD7671

True

AD7675

AD7676

AD7677

Differential

Type / kSPS

100 - 250

500 - 570

1000

PulSAR Selection