a

Unipolar CMOS ADC

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REV. D

FUNCTIONAL BLOCK DIAGRAM

SWITCHED

CAP DAC

16

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7660

D[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

FEATURES

Throughput: 100 kSPS

INL:

3 LSB Max ( 0.0046% of Full-Scale)

16-Bit Resolution with No Missing Codes

S/(N+D): 87 dB Min @ 10 kHz, 90 dB Typ @ 45 kHz

THD: –96 dB Max @ 10 kHz

Analog Input Voltage Range: 0 V to 2.5 V

Both AC and DC Specifications

No Pipeline Delay

Parallel and Serial 5 V/3 V Interface

Single 5 V Supply Operation

21 mW Typical Power Dissipation, 21

W @ 100 SPS

Power-Down Mode: 7

W Max

Package: 48-Lead Quad Flatpack (LQFP)

48-Lead Chip Scale Package (LFCSP)

Pin-to-Pin Compatible with the AD7664

APPLICATIONS

Data Acquisition

Battery-Powered Systems

PCMCIA

Instrumentation

Automatic Test Equipment

Scanners

Medical Instruments

Process Control

GENERAL DESCRIPTION

The AD7660 is a 16-bit, 100 kSPS, charge redistribution SAR,

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

supply. The part contains an internal conversion clock, error cor-

rection circuits, and both serial and parallel system interface ports.

The AD7660 is hardware factory-calibrated and is comprehen-

sively tested to ensure ac parameters such 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 with correspondingly low cost and is

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

operation specified from –40

∞C to +85∞C.

PRODUCT HIGHLIGHTS

1. Fast Throughput

The AD7660 is a 100 kSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

2. Superior INL

The AD7660 has a maximum integral nonlinearity of 3 LSBs

with no missing 16-bit code.

3. Single-Supply Operation

The AD7660 operates from a single 5 V supply and only

dissipates 21 mW typical. Its power dissipation decreases

with the throughput to, for instance, only 21

mW at a 100 SPS

throughput. It consumes 7

mW maximum when in power-down.

4. Serial or Parallel Interface

Versatile parallel or 2-wire serial interface arrangement com-

patible with both 3 V or 5 V logic.

*Patent pending

Table I. PulSAR Selection

Type/kSPS

100–250

500–570

800–1000

Pseudo

AD7651

AD7650/AD7652 AD7653

Differential

AD7660/AD7661 AD7664/AD7666 AD7667

True Bipolar

AD7663

AD7665

AD7671

True

AD7675

AD7676

AD7677

Differential

18-Bit

AD7678

AD7679

AD7674

Simultaneous/

AD7654

Multichannel

AD7655