Overview
Features and Benefits
- Charge Balancing ADC
24 Bits, No Missing Codes
±0.0015% Nonlinearity - 2-Channel Programmable Gain Front End
Gains from 1 to 128
Differential Inputs - 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 (7 mW Typ)
Product Details
The AD7710 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a strain gage or 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 two differential analog inputs and a differential reference input. 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. 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 AD7710 thus performs all signal conditioning and conversion for a single or dual channel system.
The AD7710 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 AD7710 contains self-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.
PRODUCT HIGHLIGHTS
- The programmable gain front end allows the AD7710 to accept input signals directly from a strain gage or transducer, removing a considerable amount of signal conditioning.
- The AD7710 is ideal for microcontroller or DSP processor applications with an on-chip control register that allows control over filter cutoff, input gain, channel selection, signal polarity, and calibration modes.
- The AD7710 allows the user to read and write the on-chip calibration registers. This means that the microcontroller has much greater control over the calibration procedure.
- No missing codes ensures true, usable, 23-bit dynamic range coupled with excellent ±0.0015% accuracy. The effects of temperature drift are eliminated by on-chip self-calibration, which removes zero-scale and full-scale errors.
APPLICATIONS
- Weigh Scales
- Thermocouples
- Process Control
- Smart Transmitters
- Chromatography
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015
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AN-389: Using Sigma-Delta Converters-Part 22/14/2015
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AN-388: Using Sigma-Delta Converters-Part 12/14/2015
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AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008
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AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006
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AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004
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AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002
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AN-283: Sigma-Delta ADCs and DACs9/24/2002
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AN-553: Adjusting the Calibration Coefficients on the AD771X Family of ADCs1/1/2000
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AN-241: Evaluation Board for the AD7710 High Resolution (24-Bits) Sigma-Delta A/D Converter1/1/2000
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AN-406: Using the AD771X Family of 24-Bit Sigma-Delta A/D Converters1/1/2000
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Designing Power Supplies for High Speed ADC2/1/2012
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Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter1/12/2006
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Part 2: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs6/1/2002
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Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs10/1/2001
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Ask the Applications Engineer—16: Using Sigma-Delta Converters, Part 24/1/1994 Analog Dialogue
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Design Ideas for Sigma-Delta Instrumentation ADCs4/1/1993 Analog Dialogue
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Monolithic Sigma-Delta A/D Converters Offer 21-bit Resolution2/1/1992 Analog Dialogue
Software & Systems Requirements
Code Examples
AD7710 Code Examples
Tools & Simulations
Design Tool
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD7710ANZ | Material Declaration | Reliability Data | 24-Lead PDIP | |
| AD7710AQ | Material Declaration | Reliability Data | 24-Lead CerDIP (Narrow 0.3 Inch) | |
| AD7710ARZ | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7710ARZ-REEL | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7710ARZ-REEL7 | Material Declaration | Reliability Data | 24-Lead SOIC (Wide) | |
| AD7710SQ | Material Declaration | Reliability Data | 24-Lead CerDIP (Narrow 0.3 Inch) | |
| Wafer Fabrication Data |
PCN-PDN Information
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Sample & Buy
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Lead Times
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