AD7711ANZ

更新时间： 2024-11-29 12:33:55

品牌	Logo	应用领域
亚德诺 - ADI		转换器模数转换器光电二极管 PC
页数	文件大小	规格书
28页	301K
描述
LC2MOS Signal Conditioning ADC with RTD Excitation Currents

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AD7711ANZ 数据手册

LC²MOS Signal Conditioning ADC

with RTD Excitation Currents

AD7711

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Charge-Balancing ADC

24 Bits, No Missing Codes

REF

IN (+)

IN (–)

REF OUT

BIAS

؎0.0015% Nonlinearity

2-Channel Programmable Gain Front End

Gains from 1 to 128

1 Differential Input

2.5V REFERENCE

4.5␮A

CHARGE-BALANCING A/D

CONVERTER

1 Single-Ended Input

AIN1(+)

AIN1(–)

AUTO-ZEROED

DIGITAL

SYNC

Low-Pass Filter with Programmable Filter Cutoffs

Ability to Read/Write Calibration Coefficients

RTD Excitation Current Sources

Bidirectional Microcontroller Serial Interface

Internal/External Reference Option

Single- or Dual-Supply Operation

Low Power (25 mW typ) with Power-Down Mode

(7 mW typ)

⌺-⌬

PGA

A = 1–128

FILTER

MODULATOR

AIN2

MCLK

CLOCK

200␮A

GENERATION

MCLK

OUT

RTD1

RTD2

SERIAL INTERFACE

200␮A

CONTROL

OUTPUT

APPLICATIONS

RTD Transducers

AD7711

Process Control

Smart Transmitters

Portable Industrial Instruments

AGND DGND

MODE SDATA SCLK

DRDY

RFS TFS

The AD7711 is ideal for use in smart, microcontroller based

systems. Gain settings, signal polarity, input channel selection,

and RTD current control can be configured in software using

the bidirectional serial port. The AD7711 contains self-

calibration, system calibration, and background calibration

options, and also allows the user to read and write the on-chip

calibration registers.

GENERAL DESCRIPTION

The AD7711 is a complete analog front end for low frequency

measurement applications. The device accepts low level signals

directly from a transducer and outputs a serial digital word. It

employs a ⌺-⌬ conversion technique to realize up to 24 bits of

no missing codes performance. The input signal is applied to a

proprietary programmable gain front end based around an ana-

log modulator. The modulator output is processed by an on-chip

digital filter. The first notch of this digital filter can be pro-

grammed via the on-chip control register, allowing adjustment

of the filter cutoff and settling time.

CMOS construction ensures low power dissipation, and a software

programmable power-down mode reduces the standby power

consumption to only 7 mW typical. The part is available in a

24-lead, 0.3-inch-wide, plastic and hermetic dual-in-line pack-

age (DIP) as well as a 24-lead small outline (SOIC) package.

The part features one differential analog input and one single-

ended analog input as well as a differential reference input.

Normally, one of the input channels will be used as the main

channel with the second channel used as an auxiliary input to

periodically measure a second voltage. It can be operated from a

single supply (by tying the V_SSpin to AGND), provided that the

input signals on the analog inputs are more positive than –30 mV.

By taking the V_SSpin negative, the part can convert signals

down to –V_REFon its inputs. The part provides two current

sources that can be used to provide excitation in 3-wire and 4-wire

RTD configurations. The AD7711 thus performs all signal

conditioning and conversion for a single- or dual-channel system.

PRODUCT HIGHLIGHTS

1. The programmable gain front end allows the AD7711 to

accept input signals directly from an RTD transducer,

removing a considerable amount of signal conditioning.

On-chip current sources provide excitation for 3-wire and

4-wire RTD configurations.

2. No missing codes ensure true, usable, 23-bit dynamic range

coupled with excellent ± 0.0015% accuracy. The effects of

temperature drift are eliminated by on-chip self-calibration,

which removes zero-scale and full-scale errors.

3. The AD7711 is ideal for microcontroller or DSP processor

applications with an on-chip control register that allows

control over filter cutoff, input gain, channel selection, signal

polarity, RTD current control, and calibration modes.

4. The AD7711 allows the user to read and to write the on-chip

calibration registers. This means that the microcontroller has

much greater control over the calibration procedure.

REV. G

Information furnished by Analog Devices is believed to be accurate and

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

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

may result from its use. 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

Fax: 781/326-8703

www.analog.com

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中文翻译

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AD7711ANZ 替代型号

型号	品牌	替代类型	描述	数据表
AD7711AN	ADI	完全替代	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7793BRUZ	ADI	功能相似	3-Channel, Low Noise, Low Power, 24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
AD7711AQ	ADI	功能相似	LC2MOS Signal Conditioning ADC with RTD Excitation Currents

与AD7711ANZ相关器件

型号	品牌	获取价格	描述	数据表
AD7711AQ	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7711AR	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7711AR-REEL	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7711AR-REEL7	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7711ARZ	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7711ARZ-REEL	ADI	获取价格	CMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with Matched RTD Excitation Currents
AD7711ASQ	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Current Source
AD7711SQ	ADI	获取价格	LC2MOS Signal Conditioning ADC with RTD Excitation Currents
AD7712	ADI	获取价格	LC2MOS Signal Conditioning ADC
AD7712*	ADI	获取价格	LC2MOS Signal Conditioning ADC

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