AD7713

LC2MOS回路供电信号调理ADC LC2MOS Loop-Powered Signal Conditioning ADC

Product Details

The 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 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.

The part features two differential analog inputs and one single-ended 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 which can be used to provide excitation in three-wire and four-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.

CMOS construction ensures low power dissipation and a hardware programmable power-down mode reduces the standby power consumption to only 150 µW typical. The part is available in a 24-pin, 0.3 inch wide, plastic and hermetic dual-in-line package DIP as well as a 24-lead small outline SOIC package.

### Features and Benefits

.

Charge Balancing ADC

24 Bits No Missing Codes

±0.0015% Nonlinearity

.

Low-Pass Filter with Programmable Filter Cutoffs

.

Ability to Read/Write Calibration Coefficients

.

Bidirectional Microcontroller Serial Interface

.

3-Channel Programmable Gain Front End

Gains from 1 to 128

2 Differential Inputs

1 Single-Ended High Voltage Input

.

Single-Supply Operation

.

Low Power 3.5 mW typ with Power-Down Mode 150 µW typ