GENERAL DESCRIPTION?

The AD7714 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 sigma-delta 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 analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and settling time.

FEATURES

Charge Balancing ADC 24 Bits No Missing Codes 0.0015 Nonlinearity

Five-Channel Programmable Gain Front End Gains from 1 to 128 Can Be Configured as Three Fully Differential Inputs or Five Pseudo-Differential Inputs

Three-Wire Serial Interface SPI?, QSPI?, MICROWIRE? and DSP Compatible

3 V (AD7714-3) or 5 V (AD7714-5) Operation

Low Noise (<150 nV rms)

Low Current (350? mA typ) with Power-Down (5 mA typ)

AD7714Y Grade:

+2.7 V to 3.3 V or +4.75 V to +5.25 V Operation 0.0010 Linearity Error –40°C to +105°C Temperature Range Schmitt Trigger on SCLK and DIN

Low Current (226? mA typ) with Power-Down (4 mA typ)

Lower Power Dissipation than Standard AD7714 Available in 24-Lead TSSOP Package

Low-Pass Filter with Programmable Filter Cutoffs

Ability to Read/Write Calibration Coefficients

APPLICATIONS

Portable Industrial Instruments

Portable Weigh Scales

Loop-Powered Systems

Pressure Transducers

AD7714AR-3屬于集成電路（IC） > 模數(shù)轉換器（ADC）。亞德諾半導體技術有限公司制造生產(chǎn)的AD7714AR-3模數(shù)轉換器（ADC）模數(shù)轉換器（ADC、A/D 或 A 轉 D）對模擬信號進行采樣，例如由麥克風采集的聲音或傳感器的輸出，然后將其轉換為數(shù)字信號。一般來說，數(shù)字輸出是二進制補碼二進制數(shù)，與輸入成比例。輸入類型可能是差分、偽差分或單端輸入。模數(shù)轉換器可按照位數(shù)、采樣率、輸入數(shù)、接口、轉換器數(shù)和架構（例如自適應增量、雙斜率、折疊、流水線、SAR、三角積分、兩步式）進行選擇。