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AD7714:  CMOS, 3V/5V, 500 µA, 24-Bit Sigma-Delta, Signal Conditioning ADC

Product Details


The AD7714 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 three differential analog inputs (which can also be configured as five pseudo-differential analog inputs) as well as a differential reference input. The AD7714 thus performs all signal conditioning and conversion for a system consisting of up to five channels. A new Y grade has recently been added to the existing range. Compared to the A grades this new grade has an extended operating temperature range, schmitt trigger inputs on SCLK and DIN, tighter linearity specifications, lower power consumption and is available in a smaller package.

The AD7714 is ideal for use in smart microcontroller- or DSP-based systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity and channel selection can be configured in software using the serial port. The AD7714 provides 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 very low power dissipation, and the power-down mode reduces the standby power consumption to 15 µW typical at 3 V. Minimum operating voltage for the A grades is 3 V and 2.7 V for the Y grades. The A grades are available in a 24-pin, 0.3 inch-wide, plastic dual-in-line package (DIP); a 24 lead small outline (SOIC) package and a 28-lead shrink small outline package (SSOP). The new Y grade is available in a 24-pin, 0.3 inch-wide, plastic dual-in-line package (DIP); a 24 lead small outline (SOIC) package and a 24-lead Thin Shrink Small Outline Package (TSSOP).

FEATURES and BENEFITS

  • Charge Balancing ADC
    - 24 Bits No Missing Codes
    - 0.0015% Nonlinearity
  • Five-Channel Programmable Gain Front End
    - Gains from 1 to 128
    - Can Be Configured as Three Fully Differential
    - Inputs or Five Pseudo-Differential Inputs
  • Three-Wire Serial Interface
    - SPI®, QSPI™, MICROWIRE™ and DSP Compatible
  • 3 V (AD7714-3) or 5 V (AD7714-5) Operation
  • Low Current (350 µA typ) with Power-Down (5 µA typ)
  • Low Noise (<150 nV rms)
  • Low-Pass Filter with Programmable Filter Cutoffs
  • Please see data sheet for additional features

Functional Block Diagram for AD7714

Documentation

Title Content Type File Type
AD7714: CMOS, 3V/5V, 500 µA, 24-Bit Sigma-Delta, Signal Conditioning ADC Data Sheet  (Rev C, 06/1998) (pdf, 306 kB) Data Sheets PDF
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging  (pdf, 217 kB) Application Notes PDF
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC  (pdf, 222 kB) Application Notes PDF
AN-615: Peak-to-Peak Resolution Versus Effective Resolution  (pdf, 70 kB)
This application note describes effective resolution and peak-to-peak resolution and highlights the difference between these two specifications.
Application Notes PDF
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:  (pdf, 149 kB)
The Most Common Causes and the Associated Fixes to Prevent Reoccurrence
Application Notes PDF
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change  (pdf, 76 kB) Application Notes PDF
AN-389: Using Sigma-Delta Converters-Part 2  (pdf, 590 kB)
When to Use/How to Use Sigma-Delta ADCs; Continuation of Part 1 Discussion.
Application Notes PDF
AN-388: Using Sigma-Delta Converters-Part 1  (pdf, 590 kB)
When to Use/How to Use Sigma-Delta ADCs
Application Notes PDF
AN-283: Sigma-Delta ADCs and DACs  (pdf, 1699 kB)
Overview of Sigma-Delta Concepts: Oversampling, Noise Shaping Using the Sigma-Delta Modulator, Digital Filtering and Decimation.
Application Notes PDF
AN-553: Adjusting the Calibration Coefficients on the AD771X Family of ADCs  (pdf, 221 kB) Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter
(Electronic Design, 1/12/06)
Technical Articles HTML
Low-Power, Low-Voltage IC Choices for ECG System Requirements
(Analog Dialogue, Vol. 29, No. 3, 1995)
Technical Articles HTML
Circuit Suggestions Using Features and Functionality of New Sigma-Delta ADCs Technical Articles HTML
Designing and Applying Remote Field Instruments
by Albert O' Grady and Jim Ryan, Analog Devices B.V.
...Good things can come in small packages because of on-chip capabilities
(Control Engineering, September 1998)
Technical Articles HTML
Low-Power, Low-Voltage IC Choices for ECG System Requirements
(Analog Dialogue, Vol. 29, No. 3, 1995)
Analog Dialogue HTML
Interfacing to Serial Converters Analog Dialogue HTML
Build a Smart Analog Process-Instrument Transmitter with Low-Power Converters and a Microcontroller
(Analog Dialogue, Vol. 31, No. 1, 1997)
Analog Dialogue HTML
Ask the Applications Engineer-27: What problems am I most likely to run into when instrumenting an industrial system?
(Analog Dialogue, Vol. 33, No. 2, February, 1999)
Analog Dialogue HTML
RAQs index Rarely Asked Questions HTML
What Architecture is used in the AD7714, AD7715 ADC? FAQs/RAQs HTML
How do I use the serial interface on the AD7714, AD7715 ADC? FAQs/RAQs HTML
What are some general design considerations when using the AD7714, AD7715 ADC? FAQs/RAQs HTML
What are the calibration options on the AD7714, AD7715 ADC? FAQs/RAQs HTML
How do I get the best performance from the AD7714, AD7715 ADC? FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Utilities and Conversions HTML
Sigma Delta Register Configuration Assistant
Easily program the configuration registers for the sigma delta ADCs. Use pull-down menus to determine the correct hex values to load into the registers, and generate pseudo-code.
Design Calculators HTML
Digital Filter Model Spreadsheets
These spreadsheet tools show the response of the digital filter section of the AD71xx and AD77xx devices based on input parameters.
Design Calculators HTML
AD7714 Code Examples Code Examples HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Voltage References for the AD7714

  • For precision 2.5V applications with AVdd = 5V, we recommend AD780, REF43 or the REF192.
  • For precision 1.2V applications with AVdd = 3V, we recommend the AD589, AD1580 or the ADR512.
Recommended Digital Isolators for the AD7714
  • For optocoupler alternatives, see our digital isolator selection tables, ADuMxxxx.
  • For process control applications, we recommend the ADuM1400 and the ADuM1200 icoupler.
  • For isolated USB designs in healthcare and industrial control, we recommend the ADuM4160.
Recommended Power Solutions

  • For selecting voltage regulator products, use ADIsimPower.

Were these recommendations helpful?

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Price, packaging, availability

AD7714 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7714ACHIPS-3 Status: Production CHIPS OR DIE 0 Ind Tray, 49 - $11.73 Y  Material Info PCN Purchase
AD7714ACHIPS-5 Status: Production CHIPS OR DIE 0 Ind Tray, 49 - $11.73 Y  Material Info PCN Purchase
AD7714AN-5 Status: Production 24 ld PDIP 24 Ind Tube, 15 $13.29 $11.30 N  Material Info PCN Purchase
AD7714ANZ-3 Status: Production 24 ld PDIP 24 Ind Tube, 15 $12.09 $10.27 Y  Material Info PCN Purchase
AD7714ANZ-5 Status: Production 24 ld PDIP 24 Ind Tube, 15 $11.51 $9.78 Y  Material Info PCN Purchase Sample
AD7714AR-3 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $13.55 $11.51 N  Material Info PCN Purchase
AD7714AR-3REEL Status: Last Time Buy 24 ld SOIC - Wide 24 Ind Reel, 1000 - $11.51 N  Material Info PCN/PDN Purchase
AD7714AR-5 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $12.90 $10.96 N  Material Info PCN Purchase
AD7714AR-5REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $10.96 N  Material Info PCN Purchase
AD7714ARS-3 Status: Production 28 ld SSOP 28 Ind Tube, 47 $13.55 $11.51 N  Material Info PCN Purchase
AD7714ARS-3REEL Status: Last Time Buy 28 ld SSOP 28 Ind Reel, 1500 - $11.51 N  Material Info PCN/PDN Purchase
AD7714ARS-5 Status: Production 28 ld SSOP 28 Ind Tube, 47 $12.90 $10.96 N  Material Info PCN Purchase
AD7714ARS-5REEL Status: Last Time Buy 28 ld SSOP 28 Ind Reel, 1500 - $10.96 N  Material Info PCN/PDN Purchase
AD7714ARSZ-3 Status: Production 28 ld SSOP 28 Ind Tube, 47 $11.17 $9.49 Y  Material Info PCN Purchase
AD7714ARSZ-3REEL Status: Production 28 ld SSOP 28 Ind Reel, 1500 - $9.49 Y  Material Info PCN Purchase
AD7714ARSZ-5 Status: Production 28 ld SSOP 28 Ind Tube, 47 $11.17 $9.49 Y  Material Info PCN Purchase
AD7714ARSZ-5REEL Status: Production 28 ld SSOP 28 Ind Reel, 1500 - $9.49 Y  Material Info PCN Purchase
AD7714ARZ-3 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $11.73 $9.96 Y  Material Info PCN Purchase
AD7714ARZ-3REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $9.96 Y  Material Info PCN Purchase
AD7714ARZ-5 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $11.17 $9.49 Y  Material Info PCN Purchase Sample
AD7714ARZ-5REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $9.49 Y  Material Info PCN Purchase
AD7714YN Status: Production 24 ld PDIP 24 Ind Tube, 15 $11.72 $9.96 N  Material Info PCN Purchase
AD7714YNZ Status: Production 24 ld PDIP 24 Ind Tube, 15 $10.15 $8.63 Y  Material Info PCN Purchase
AD7714YR Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $11.38 $9.68 N  Material Info PCN Purchase
AD7714YR-REEL7 Status: Contact ADI 24 ld SOIC - Wide 24 Ind Reel, 400 - - N  Material Info PCN/PDN Contact ADI
AD7714YRU Status: Production 24 ld TSSOP 24 Ind Tube, 62 $11.38 $9.68 N  Material Info PCN Purchase
AD7714YRU-REEL Status: Contact ADI 24 ld TSSOP 24 Ind Reel, 2500 - - N  Material Info PCN/PDN Contact ADI
AD7714YRU-REEL7 Status: Last Time Buy 24 ld TSSOP 24 Ind Reel, 1000 - $9.68 N  Material Info PCN/PDN Purchase
AD7714YRUZ Status: Production 24 ld TSSOP 24 Ind Tube, 62 $9.86 $8.38 Y  Material Info PCN Purchase
AD7714YRUZ-REEL Status: Production 24 ld TSSOP 24 Ind Reel, 2500 - $8.38 Y  Material Info PCN Purchase
AD7714YRUZ-REEL7 Status: Production 24 ld TSSOP 24 Ind Reel, 1000 - $8.38 Y  Material Info PCN Purchase
AD7714YRZ Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $9.86 $8.38 Y  Material Info PCN Purchase
AD7714YRZ-REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $8.38 Y  Material Info PCN Purchase
AD7714YRZ-REEL7 Status: Production 24 ld SOIC - Wide 24 Ind Reel, 400 - $8.38 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD7714 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7714-3EBZ Status: Production Evaluation Board $151.80 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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