AD7712

PRODUCTION

CMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with 2 Analog Input Channels

Data Sheet (Rev. F) Product Selection Table
Viewing:

Overview

  • Charge Balancing ADC
     24 Bits No Missing Codes
     ±0.0015% Nonlinearity
  • High Level and Low Level Analog Input Channels
  • Programmable Gain for Both Inputs
     Gains from 1 to 128
     Differential Input for Low Level Channel
  • Low-Pass Filter with Programmable Filter Cutoffs
  • Ability to Read/Write Calibration Coefficients
  • Bidirectional Microcontroller Serial Interface
  • Internal/External Reference Option
  • Single- or Dual-Supply Operation
  • Low Power (25 mW typ) with Power-Down Mode (100 µW typ)

The AD7712 is a complete analog front end for low frequency measurement applications. The device has two analog input channels and accepts either low level signals directly from a transducer or high level (±4 × VREF) signals 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 low level input signal is applied to a proprietary programmable gain front end based around an analog modulator. The high level analog input is attenuated before being applied to the same 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.

Normally, one of the channels will be used as the main channel with the second channel used as an auxiliary input to periodically measure a second voltage. The part can be operated from a single supply (by tying the VSS pin to AGND) provided that the input signals on the low level analog input are more positive than -30 mV. By taking the VSS pin negative, the part can convert signals down to -VREF on this low level input. This low level input, as well as the reference input, features differential input capability.

The AD7712 is ideal for use in smart, microcontroller-based systems. Input channel selection, gain settings and signal polarity can be configured in software using the bidirectional serial port. The AD7712 also 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 100 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.
AD7712
CMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with 2 Analog Input Channels
AD7712 Functional Block Diagram
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Application Note 10

Technical Articles 4

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

AD7712 Code Examples 2

Tools & Simulations

Sigma-Delta ADC Tutorial

An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

Open Tool

Evaluation Kits

EVAL-AD7712

AD7712 Evaluation Board

Buy Now View Details

Product Details

This converter utilizes sigma-delta techniques to offer 16-bit accuracy (0.0015% FSR) and no missing codes to 24-bits. It contains a two-channel programmable gain front end, a programmable low-pass digital filter and a bidirectional serial interface. One of the analog inputs and the reference input are differential and the part can accept inputs as low as 20 mV full-scale on this differential analog input. The second analog input contains an input attenuation circuit and can accept inputs up to ±10V. The part features a self-calibration mode, which removes internal offset and gain errors, a system calibration mode, which removes external circuit offset and gain errors, and a background calibration mode which automatically removes internal offset and gain errors. In addition, its flexible serial interface allows the AD7712 to connect directly to Digital Signal Processors (ADSP-2101, TMS320C25, etc.) and Microcontrollers (8XC51, 68HC11, etc.). Full data on the AD7712 is available in the AD7712 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.

EVAL-AD7712
AD7712 Evaluation Board

Latest Discussions

2 Years Ago
Interceptors Request
2 Years Ago
Interceptors Request
2 Years Ago
Interceptors Request
View related discussion on EngineerZone®

Recently Viewed