Datasheet > AD7794

AD7794

更新时间： 2024-11-05 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
21页	261K
描述
Low Power, 24-Bit Sigma-Delta ADC with In-Amp and Embedded Reference (6 Channel)

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AD7794 数据手册

Low Power, 24-Bit Sigma-Delta ADC with In-

Amp and Embedded Reference (6 Channel)

Preliminary Technical Data

AD7794

FEATURES

APPLICATIONS

Six Differential Analog Inputs

Temperature measurement

Pressure measurement

Weigh scales

Low Noise Programmable Gain Instrumentation-Amp

RMS noise: 80 nV (Gain = 64)

Bandgap Reference with 5 ppm/ C Drift typ

Power

Supply: 2.7 V to 5.25 V operation

Normal: 400 µA typ

GENERAL DESCRIPTION

The AD7794 is a low power, complete analog front end for

low frequency measurement applications. It contains a low

noise 24-bit ∑-∆ ADC with six differential inputs. The on-chip

low noise instrumentation amplifier means that signals of small

amplitude can be interfaced directly to the ADC.

Power-down: 1 µA max

Update Rate: 4 Hz to 500 Hz

Simultaneous 50 Hz/60 Hz Rejection

Internal Clock Oscillator

Reference Detect

The device contains a precision low noise, low drift internal

reference for absolute measurements. An external reference can

also be used if ratiometric measurements are required. Other

on-chip features include programmable excitation current

sources and a bias voltage generator for temperature applica-

tions along with 100 nA burnout currents. For pressure and

weighscale applications, a low-side power switch is available to

power down the bridge between conversions to minimize the

power consumption of the system. The device can be operated

with the internal clock or, alternatively, an external clock can be

used if synchronizing several devices. The output data rate

from the part is software programmable and can be varied from

4 Hz to 500 Hz.

Programmable Current Sources (10 µA/200 µA/1 mA)

On-Chip Bias Voltage Generator

100 nA Burnout Currents

Low Side Power Switch

Independent Interface Power Supply

24-Lead TSSOP Package

INTERFACE

3-wire serial

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

Schmitt trigger on SCLK

The part operates with a power supply from 2.7 V to 5.25 V. It

consumes a current of 450 uA maximum and is housed in a 24-

lead TSSOP package.

FUNCTIONAL BLOCK DIAGRAM

AIN4(+)/REFIN2(+) REFIN1(+) AIN4(-)/REFIN2(-) REFIN1(-)

GND

BIAS

REFERENCE

DETECT

BANDGAP

REFERENCE

AIN1(+)

AIN1(-)

AIN2(+)

GND

SERIAL

INTERFACE

AND

CONTROL

LOGIC

DOUT/RDY

DIN

AIN2(-)

AIN3(+)

AIN3(-)

SIGMA DELTA

ADC

IN-AMP

SCLK

MUX

AIN5(+)/IOUT2

AIN5(-)/IOUT1

AIN6(+)/P1

AIN6(-)/P2

GND

TEMP

SENSOR

DVDD

INTERNAL

CLOCK

AD7794

PSW

GND

CLK

REV.PrE

6/04.

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 companies.

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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与AD7794相关器件

型号	品牌	获取价格	描述	数据表
AD7794_07	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7794_15	ADI	获取价格	6-Channel, Low Noise, Low Power
AD7794BRU	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7794BRU-REEL	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7794BRUZ	ROCHESTER	获取价格	6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24, ROHS COMPLIANT, MO-153AD, TSSOP-24
AD7794BRUZ1	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7794BRUZ-REEL	ROCHESTER	获取价格	6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24, ROHS COMPLIANT, MO-153AD, TSSOP-24
AD7794BRUZ-REEL1	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î
AD7794CRUZ	ROCHESTER	获取价格	6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24, ROHS COMPLIANT, MO-153AD, TSSOP-24
AD7794CRUZ1	ADI	获取价格	6-Channel, Low Noise, Low Power, 24-/16-Bit Î

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