REV. A

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a

AD7677

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002

16-Bit, 1 LSB INL, 1 MSPS

Differential ADC

FUNCTIONAL BLOCK DIAGRAM

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

OB/

2C

16

DATA[15:0]

BUSY

CS

SER/

PAR

OGND

OVDD

DGND

DVDD

SERIAL

PORT

PARALLEL

INTERFACE

BYTESWAP

RD

AVDD AGND REF REFGND

PD

RESET

CNVST

IN–

SWITCHED

CAP DAC

AD7677

IN+

IMPULSE

WARP

PulSAR Selection

Type/kSPS

100–250

500–570

1000

Pseudo

AD7660

AD7650

Differential

AD7664

True Bipolar

AD7663

AD7665

AD7671

True Differential

AD7675

AD7676

AD7677

FEATURES

Throughput: 1 MSPS

INL:

1 LSB Max ( 0.0015% of Full Scale)

16 Bits Resolution with No Missing Codes

S/(N+D): 94 dB Typ @ 45 kHz

THD: –110 dB Typ @ 45 kHz

Differential Input Range:

2.5 V

Both AC and DC Specifications

No Pipeline Delay

Parallel (8 Bits/16 Bits) and Serial 5 V/3 V Interface

Single 5 V Supply Operation

115 mW Typical Power Dissipation, 15

W @ 100 SPS

Power-Down Mode: 7

W Max

Packages: 48-Lead Quad Flatpack (LQFP)

48-Lead Frame Chip Scale (LFCSP)

Pin-to-Pin Compatible Upgrade of the AD7664/AD7675/

AD7676

APPLICATIONS

CT Scanners

Data Acquisition

Instrumentation

Spectrum Analysis

Medical Instruments

Battery-Powered Systems

Process Control

GENERAL DESCRIPTION

The AD7677 is a 16-bit, 1 MSPS, charge redistribution SAR,

fully differential, 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.

The AD7677 is hardware factory calibrated and comprehen-

sively tested to ensure such ac parameters as signal-to-noise

ratio (SNR) and total harmonic distortion (THD), in addition

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

It features a very high sampling rate mode (Warp); a fast

mode (Normal) for asynchronous conversion rate applica-

tions; and, for low power applications, a reduced power mode

(Impulse) where the power is scaled with the throughput.

The AD7677 is available in a 48-lead LQFP or a tiny 48-lead

LFCSP with operation specified from –40

°C to +85°C.

PRODUCT HIGHLIGHTS

1. Excellent INL

The AD7677 has a maximum integral nonlinearity of 1 LSB

with a no missing 16-bit code.

2. Superior AC Performances

The AD7677 has a minimum dynamic of 92 dB, 94 dB typical.

3. Fast Throughput

The AD7677 is a 1 MSPS, charge redistribution, 16-bit SAR

ADC with internal error correction circuitry.

4. Single-Supply Operation

The AD7677 operates from a single 5 V supply and typically

dissipates only 115 mW. Its power dissipation decreases

with the throughput. It consumes 7

µW maximum when in

power-down.

5. Serial or Parallel Interface

Versatile parallel (8 bits or 16 bits) or 2-wire serial inter-

face arrangement compatible with both 3 V or 5 V logic.