AD7666 データシートの表示（PDF） - Analog Devices

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AD7666

16-Bit 500 kSPS PulSAR® Unipolar ADC with Reference

Analog Devices 

FEATURES

2.5 V internal reference: typical drift 3 ppm/°C

Guaranteed max drift 15 ppm/°C

Throughput: 500 kSPS

INL: ±2.0 LSB max (±0.0038% of full scale)

16-bit resolution with no missing codes

S/(N+D): 88 dB min @ 20 kHz

THD: –96 dB max @ 20 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

SPI®/QSPITM/MICROWIRETM/DSP compatible

Single 5 V supply operation

Power dissipation

66 mW typ, 132 µW @ 1 kSPS without REF

81 mW typ with REF

48-lead LQFP and 48-lead LFCSP packages

Pin-to-pin compatible with PulSAR ADCs

APPLICATIONS

Data acquisition

Medical instruments

Digital signal processing

Spectrum analysis

Instrumentation

Battery-powered systems

Process control

GENERAL DESCRIPTION

The AD7666 is a 16-bit, 500 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, internal reference, error

correction circuits, and both serial and parallel system inter-

face ports. The AD7666 is hardware factory-calibrated and

comprehensively 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.

The AD7666 is available in a 48-lead LQFP and a tiny 48-lead

LFCSP, with operation specified from –40°C to +85°C.

Rev. 0

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.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

16-Bit 500 kSPS PulSAR®

Unipolar ADC with Reference

AD7666

AGND

AVDD

IN

INGND

PDREF

PDBUF

PD

RESET

FUNCTIONAL BLOCK DIAGRAM

REFBUFIN REF REFGND

DVDD DGND

AD7666

REF

SWITCHED

CAP DAC

SERIAL

PORT

16

CLOCK

PARALLEL

INTERFACE

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CNVST

OVDD

OGND

DATA[15:0]

BUSY

RD

CS

SER/PAR

OB/2C

BYTESWAP

Figure 1. Functional Block Diagram

Table 1. PulSAR Selection

Type/kSPS

Pseudo-

Differential

True Bipolar

True

Differential

18-Bit

Multichannel/

Simultaneous

100–250

AD7651

AD7660/AD7661

AD7663

AD7675

AD7678

500–570

AD7650/AD7652

AD7664/AD7666

AD7665

AD7676

AD7679

AD7654

AD7655

800–

1000

AD7653

AD7667

AD7671

AD7677

AD7674

PRODUCT HIGHLIGHTS

1. Fast Throughput.

The AD7666 is a 500 kSPS, charge redistribution, 16-bit

SAR ADC with internal error correction circuitry.

2. Superior INL.

The AD7666 has a maximum integral nonlinearity of

2.0 LSB with no missing 16-bit codes.

3. Internal Reference.

The AD7666 has an internal reference with a typical

temperature drift of 3 ppm/°C.

4. Single-Supply Operation.

The AD7666 operates from a single 5 V supply. Its power

dissipation decreases with throughput.

5. Serial or Parallel Interface.

Versatile parallel or 2-wire serial interface arrangement is

compatible with both 3 V and 5 V logic.

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 © 2004 Analog Devices, Inc. All rights reserved.

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