GENERAL DESCRIPTION

The AD7719 is a complete analog front end for low frequency measurement applications. It contains two high resolution Σ-∆ ADCs, switchable matched excitation current sources, low-side power switches, digital I/O port, and temperature sensor.

FEATURES

HIGH RESOLUTION Σ-Δ ADCs

2 Independent ADCs (16- and 24-Bit Resolution)

Factory-Calibrated (Field Calibration Not Required)

Output Settles in 1 Conversion Cycle (Single

Conversion Mode)

Programmable Gain Front End

Simultaneous Sampling and Conversion of 2

Signal Sources

Separate Reference Inputs for Each Channel

Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz

Update Rate

ISOURCE Select™

24-Bit No Missing Codes—Main ADC

13-Bit p-p Resolution @ 20 Hz, 20 mV Range

18-Bit p-p Resolution @ 20 Hz, 2.56 V Range

INTERFACE

3-Wire Serial

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

Schmitt Trigger on SCLK

POWER

Specified for Single 3 V and 5 V Operation

Normal: 1.5 mA Typ @ 3 V

Power-Down: 10 μA (32 kHz Crystal Running)

ON-CHIP FUNCTIONS

Rail-Rail Input Buffer and PGA

4-Bit Digital I/O Port

On-Chip Temperature Sensor

Dual Switchable Excitation Current Sources

Low-Side Power Switches

Reference Detect Circuit

APPLICATIONS

Sensor Measurement

Temperature Measurement

Pressure Measurement

Weigh Scales

Portable Instrumentation

4 to 20 mA Transmitters

AD7719BRU属于集成电路（IC） > 模数转换器（ADC）。亚德诺半导体技术有限公司制造生产的AD7719BRU模数转换器（ADC）模数转换器（ADC、A/D 或 A 转 D）对模拟信号进行采样，例如由麦克风采集的声音或传感器的输出，然后将其转换为数字信号。一般来说，数字输出是二进制补码二进制数，与输入成比例。输入类型可能是差分、伪差分或单端输入。模数转换器可按照位数、采样率、输入数、接口、转换器数和架构（例如自适应增量、双斜率、折叠、流水线、SAR、三角积分、两步式）进行选择。