AD7711
PRODUCTIONCMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with Matched RTD Excitation Currents
- Part Models
- 7
- 1ku List Price
- Starting From $31.42
Part Details
- Charge-Balancing ADC
24 Bits, No Missing Codes
±0.0015% Nonlinearity - 2-Channel Programmable Gain Front End
Gains from 1 to 128
1 Differential Input
1 Single-Ended Input - Low-Pass Filter with Programmable Filter Cutoffs
- Ability to Read/Write Calibration Coefficients
- RTD Excitation Current Sources
- Bidirectional Microcontroller Serial Interface
- Internal/External Reference Option
- Single- or Dual-Supply Operation
- Low Power (25 mW typ) with Power-Down Mode (7 mW typ)
The AD7711 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.
The part features one differential analog input and one single ended analog input as well as a differential reference input. Normally, one of the input channels will be used as the main channel with the second channel used as an auxiliary input to periodically measure a second voltage. It can be operated from a single supply (by tying the VSS pin to AGND) provided that the input signals on the analog inputs are more positive than -30 mV. By taking the VSS pin negative, the part can convert signals down to -VREF on its inputs. The part provides two current sources that can be used to provide excitation in three-wire and four-wire RTD configurations. The AD7711 thus performs all signal conditioning and conversion for a single or dual channel system.
The AD7711 is ideal for use in smart, microcontroller based systems. Gain settings, signal polarity, input channel selection and RTD current control can be configured in software using the bidirectional serial port. The AD7711 contains self-measurement calibration, system calibration and background calibration options and also allows the user to read and write the on-chip calibration registers.
CMOS construction ensures low power dissipation, and a software programmable power-down mode reduces the standby power consumption to only 7 mW 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 12
Technical Articles 4
Evaluation Design File 1
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 |
|---|---|---|---|
| AD7711AARZ | 24-Lead SOIC (Wide) | ||
| AD7711ANZ | 24-Lead PDIP | ||
| AD7711AQ | 24-Lead CerDIP (Narrow 0.3 Inch) | ||
| AD7711ARZ | 24-Lead SOIC (Wide) | ||
| AD7711ARZ-REEL | 24-Lead SOIC (Wide) | ||
| AD7711ARZ-REEL7 | 24-Lead SOIC (Wide) | ||
| AD7711ASQ | 24-Lead CerDIP (Narrow 0.3 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 7, 2011 - 10_0003 Halogen Free Material Change for SOIC Wide Body Products Assembled at Amkor |
||
| AD7711AARZ | PRODUCTION | |
| AD7711ARZ | PRODUCTION | |
| AD7711ARZ-REEL | PRODUCTION | |
| AD7711ARZ-REEL7 | PRODUCTION | |
|
Mar 7, 2019 - 19_0046 Assembly Transfer of 18,20,24,28 Lead PDIP to Cirtek |
||
| AD7711ANZ | 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 |
||
| AD7711ANZ | PRODUCTION | |
|
Nov 7, 2012 - 12_0199 Qualification of New Conductive Silver-Filled Glass Die Attach Adhesive for Cerdip and Ceramic Flatpack (Cerpack) Packages. |
||
| AD7711AQ | ||
| AD7711ASQ | ||
|
Nov 9, 2011 - 11_0050 Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines |
||
| AD7711AQ | ||
| AD7711ASQ | ||
|
Nov 9, 2011 - 11_0182 Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines |
||
| AD7711AQ | ||
| AD7711ASQ | ||
This is the most up-to-date revision of the Data Sheet.
Software Resources
AD7711 Code Examples 2
Evaluation Software 0
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Tools & Simulations
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open Tool