资 源 简 介
The AD7713 is a complete analog front end for low frequency measurement applicaTIons. The device accepts low level signals directly from a transducer or high level signals (4 : VREF) and outputs a serial digital word. It employs - 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. The part features two differenTIal analog inputs and one singleended high level analog input as well as a differenTIal reference input. It can be operated from a single supply (AVDD and DVDD at 5 V)。 The part provides two current sources that can be used to provide excitation in 3-wire and 4-wire RTD configurations. The AD7713 thus performs all signal conditioning and conversion for a single-, dual- or three-channel system. The AD7713 is ideal for use in smart, microcontroller-based systems. Gain settings, signal polarity, and RTD current control can be configured in software using the bidirectional serial port. The AD7713 contains self-calibration, system calibration, and background calibration options and also allows the user to read and to write the on-chip calibration registers.