Datasheet > AD7785

AD7785

更新时间： 2024-09-13 04:30:47

品牌	Logo	应用领域
亚德诺 - ADI		仪表放大器
页数	文件大小	规格书
32页	626K
描述
3-Channel, Low Noise, Low Power, 20-Bit ⒉-ツ ADC with On-Chip In-Amp and Reference

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AD7785 数据手册

3-Channel, Low Noise, Low Power, 20-Bit ∑-Δ

ADC with On-Chip In-Amp and Reference

AD7785

Industrial process control

FEATURES

Instrumentation

Portable instrumentation

Blood analysis

Smart transmitters

Liquid/gas chromatography

6-digit DVM

Up to 20 bits effective resolution

RMS noise

40 nV @ 4.17 Hz

85 nV @ 16.7 Hz

Current: 400 μA typical

Power-down: 1 μA maximum

Low noise programmable gain instrumentation amp

Band gap reference with 4 ppm/°C drift typical

Update rate: 4.17 Hz to 470 Hz

3 differential inputs

GENERAL DESCRIPTION

The AD7785 is a low power, low noise, complete analog front

end for high precision measurement applications. The AD7785

contains a low noise 20-bit ∑-Δ ADC with three differential

analog inputs. The on-chip, low noise instrumentation amplifier

means that signals of small amplitude can be interfaced directly

to the ADC. With a gain setting of 64, the rms noise is 40 nV

when the update rate equals 4.17 Hz.

Internal clock oscillator

Simultaneous 50 Hz/60 Hz rejection

Programmable current sources

On-chip bias voltage generator

Burnout currents

The device contains a precision low noise, low drift internal

band gap reference and can accept an external differential

reference. Other on-chip features include programmable

excitation current sources, burnout currents, and a bias voltage

generator. The bias voltage generator sets the common-mode

voltage of a channel to AV_DD/2.

Power supply: 2.7 V to 5.25 V

–40°C to +105°C temperature range

Independent interface power supply

16-lead TSSOP package

Interface

3-wire serial

SPI®, QSPI™, MICROWIRE™, and DSP compatible

Schmitt trigger on SCLK

The AD7785 can be operated with either the internal clock

or an external clock. The output data rate from the device is

software-programmable and can be varied from 4.17 Hz to 470

Hz. The device operates with a power supply from 2.7 V to

5.25 V. It consumes a current of 400 μA typical and is housed in

a 16-lead TSSOP package.

APPLICATIONS

Thermocouple measurements

RTD measurements

Thermistor measurements

Gas analysis

FUNCTIONAL BLOCK DIAGRAM

GND

REFIN(+)/AIN3(+) REFIN(–)/AIN3(–)

BIAS

BAND GAP

REFERENCE

GND

AIN1(+)

AIN1(–)

AIN2(+)

AIN2(–)

DOUT/RDY

DIN

SERIAL

INTERFACE

AND

CONTROL

LOGIC

MUX

Σ-Δ

ADC

BUF

IN-AMP

SCLK

GND

IOUT1

IOUT2

INTERNAL

CLOCK

AD7785

CLK

Figure 1.

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 registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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与AD7785相关器件

型号	品牌	获取价格	描述	数据表
AD7785BRUZ	ADI	获取价格	3-Channel, Low Noise, Low Power, 20-Bit ⒉-ツ A
AD7785BRUZ-REEL	ADI	获取价格	3-Channel, Low Noise, Low Power, 20-Bit ⒉-ツ A
AD7787	ADI	获取价格	Low Power, 2-Channel 24-Bit Sigma-Delta ADC
AD7787_13	ADI	获取价格	Low Power, 2-Channel 24-Bit Sigma-Delta ADC
AD7787-A	COILCRAFT	获取价格	Telecom Transformer
AD7787BRM	ADI	获取价格	Low Power, 2-Channel 24-Bit Sigma-Delta ADC
AD7787BRM-REEL	ADI	获取价格	Low Power, 2-Channel 24-Bit Sigma-Delta ADC
AD7787BRMZ	ADI	获取价格	Low Power, 2-Channel 24-Bit Sigma-Delta ADC
AD7787BRMZ-RL	ADI	获取价格	Low Power, 2-Channel 24-Bit Sigma-Delta ADC
AD7788	ADI	获取价格	Low Power, 16-/24-Bit Sigma-Delta ADC

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