AD7712
PRODUCTIONCMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with 2 Analog Input Channels
- Part Models
- 4
- 1ku List Price
- Starting From $27.10
Part Details
- 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.
Documentation
Data Sheet 1
Application Note 10
Technical Articles 4
Analog Dialogue 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7712ANZ | 24-Lead PDIP | ||
| AD7712ARZ | 24-Lead SOIC (Wide) | ||
| AD7712ARZ-REEL | 24-Lead SOIC (Wide) | ||
| AD7712ARZ-REEL7 | 24-Lead SOIC (Wide) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Mar 7, 2019 - 19_0046 Assembly Transfer of 18,20,24,28 Lead PDIP to Cirtek |
||
| AD7712ANZ | PRODUCTION | |
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
||
| AD7712ANZ | PRODUCTION | |
|
Feb 7, 2011 - 10_0003 Halogen Free Material Change for SOIC Wide Body Products Assembled at Amkor |
||
| AD7712ARZ | PRODUCTION | |
| AD7712ARZ-REEL | PRODUCTION | |
| AD7712ARZ-REEL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
AD7712 Code Examples 2
Evaluation Software 0
Can't find the software or driver you need?
Tools & Simulations
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open ToolEvaluation Kits
AD7712 Evaluation Board