Datasheet > AD7794

AD7794

更新时间： 2024-02-21 09:51:33

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 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP, TSSOP24,.25	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.38
转换器类型：	ADC, DELTA-SIGMA	JESD-30 代码：	R-PDSO-G24
JESD-609代码：	e3	长度：	7.8 mm
最大线性误差 (EL)：	0.0015%	湿度敏感等级：	1
模拟输入通道数量：	6	位数：	24
功能数量：	1	端子数量：	24
最高工作温度：	125 °C	最低工作温度：	-40 °C
输出位码：	OFFSET BINARY	输出格式：	SERIAL
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装等效代码：	TSSOP24,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	3/5 V	认证状态：	Not Qualified
座面最大高度：	1.2 mm	子类别：	Analog to Digital Converters
标称供电电压：	3 V	表面贴装：	YES
技术：	CMOS	温度等级：	AUTOMOTIVE
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	宽度：	4.4 mm
Base Number Matches：	1

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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