AD7689ACPZ;AD7689BCPZ;AD7689ACPZRL7;AD7682BCPZRL7;AD7689BCPZRL7;中文规格书,Datasheet资料

16-Bit, 4-Channel/8-Channel,

250 kSPS PulSAR ADC Data Sheet AD7682/AD7689

Rev. D

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. T rademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, M A 02062-9106, U.S.A. Tel: 781.329.4700 http://m.sodocs.net/doc/41cf8135312b3169a451a481.html Fax: 781.461.3113 ©2008–2012 Analog Devices, Inc. All rights reserved.

FEATURES

16-bit resolution with no missing codes

4-channel (AD7682)/8-channel (AD7689) multiplexer with choice of inputs

Unipolar single-ended

Differential (GND sense)

Pseudobipolar

Throughput: 250 kSPS

INL: ±0.4 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR) Dynamic range: 93.8 dB

SINAD: 92.5 dB at 20 kHz

THD: −100 dB at 20 kHz

Analog input range: 0 V to V REF with V REF up to VDD Multiple reference types

Internal selectable 2.5 V or 4.096 V

External buffered (up to 4.096 V)

External (up to VDD)

Internal temperature sensor (TEMP)

Channel sequencer, selectable 1-pole filter, busy indicator No pipeline delay, SAR architecture

Single-supply 2.3 V to 5.5 V operation with

1.8 V to 5.5 V logic interface

Serial interface compatible with SPI, MICROWIRE, QSPI, and DSP

Power dissipation

3.5 mW @ 2.5 V/200 kSPS

12.5 mW @ 5 V/250 kSPS

Standby current: 50 nA

Low cost grade available

20-lead 4 mm × 4 mm LFCSP package APPLICATIONS

Multichannel system monitoring

Battery-powered equipment

Medical instruments: ECG/EKG

Mobile communications: GPS

Power line monitoring

Data acquisition

Seismic data acquisition systems

Instrumentation

Process control

FUNCTIONAL BLOCK DIAGRAM

AD7689ACPZ;AD7689BCPZ;AD7689ACPZRL7;AD7682BCPZRL7;AD7689BCPZRL7;中文规格书,Datasheet资料

7

3

5

3

-

1

Figure 1.

Table 1. Multichannel 14-/16-Bit PulSAR® ADC

Type Channels 250 kSPS 500kSPS ADC

Driver 14-Bit 8 AD7949 ADA4841-x 16-Bit 4 AD7682ADA4841-x

16-Bit 8 AD7689AD7699 ADA4841-x GENERAL DESCRIPTION

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a single power supply, VDD.

The AD7682/AD7689 contain all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; a 4-channel

(AD7682) or 8-channel (AD7689), low crosstalk multiplexer that is useful for configuring the inputs as single-ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order. The AD7682/AD7689 use a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput.

The AD7682/AD7689 are housed in a tiny 20-lead LFCSP with operation specified from −40°C to +85°C.

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