AD7667AST datasheet(1/29 Pages) AD

Teilenummer	AD7667AST

Bauteilbeschribung	16-Bit 1 MSPS PulSAR Unipolar ADC with Reference

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16-Bit 1 MSPS PulSAR®

Unipolar ADC with Reference

AD7667

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.

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

FEATURES

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

Guaranteed max drift 15 ppm/°C

Throughput:

1 MSPS (Warp mode)

800 kSPS (Normal mode)

666 kSPS (Impulse mode)

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

No pipeline delay

Parallel and serial 5 V/3 V interface

SPI

®/QSPITM/MICROWIRETM/DSP compatible

Single 5 V supply operation

Power dissipation

87 mW typ @ 666 kSPS, 130 µW @ 1 kSPS without REF

133 mW typ @1 MSPS with REF

48-lead LQFP and 48-lead LFCSP packages

Pin-to-pin compatible with AD7671, AD7677

APPLICATIONS

Data acquisition

Medical instruments

Digital signal processing

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), a

fast mode (Normal) for asynchronous applications, and a

reduced power mode (Impulse) for low power applications

where power is scaled with the throughput. The AD7667 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. Operation

is specified from –40°C to +85°C.

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

REF

REFBUFIN

PDBUF

PDREF

BYTESWAP

Figure 1.

Table 1. PulSAR Selection

Type/kSPS

100–250

500–570

800–

1000

Pseudo-

Differential

AD7651

AD7660/AD7661

AD7650/AD7652

AD7664/AD7666

AD7653

AD7667

True Bipolar

AD7663

AD7665

AD7671

True

Differential

AD7675

AD7676

AD7677

18-Bit

AD7678

AD7679

AD7674

Multichannel/

Simultaneous

AD7654

AD7655

PRODUCT HIGHLIGHTS

1.

Fast Throughput.

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

ADC with internal error correction circuitry.

2.

Superior INL.

The AD7667 has a maximum integral nonlinearity of

2.0 LSBs with no missing 16-bit codes.

3.

Internal Reference.

The AD7667 has an internal reference with a typical

temperature drift of 3 ppm/°C.

4.

Single-Supply Operation.

The AD7667 operates from a single 5 V supply. In Impulse

mode, 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.

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