REV. 0

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

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

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© Analog Devices, Inc., 2001

16-Bit,

1 LSB INL,

500 kSPS, 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

AD7676

IN+

FEATURES

Throughput: 500 kSPS

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

SPI™/QSPI™/MICROWIRE™/DSP Compatible

Single 5 V Supply Operation

67 mW Typical Power Dissipation, 15

W @ 100 SPS

Power-Down Mode: 7

W Max

Package: 48-Lead Quad Flat Pack (LQFP)

Pin-to-Pin Compatible with the AD7675

APPLICATIONS

CT Scanners

Data Acquisition

Instrumentation

Spectrum Analysis

Medical Instruments

Battery-Powered Systems

Process Control

GENERAL DESCRIPTION

The AD7676 is a 16-bit, 500 kSPS, 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 AD7676 is hardware factory calibrated and is comprehensively

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 is fabricated using Analog Devices’ high-performance, 0.6

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

operation specified from –40

°C to +85°C.

PRODUCT HIGHLIGHTS

1. Excellent INL

The AD7676 has a maximum integral nonlinearity of 1.0 LSB

with no missing 16-bit code.

2. Superior AC Performances

The AD7676 has a minimum dynamic of 92 dB, 94 dB typical.

3. Fast Throughput

The AD7676 is a 500 kSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

4. Single-Supply Operation

The AD7676 operates from a single 5 V supply and typically

dissipates only 67 mW. It consumes 7

µW maximum when in

power-down.

5. Serial or Parallel Interface

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

arrangement compatible with either 3 V or 5 V logic.

*Patent pending

SPI and QSPI are trademarks of Motorola Inc.

MICROWIRE is a trademark of National Semiconductor Inc.