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AD7715:  3 V/5 V, 450 µA, 16-Bit, Sigma-Delta ADC

Product Details


The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a Σ-Δ conversion technique to realize up to 16 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 output update rate.

The AD7715 features a differential analog input as well as a differential reference input. It operates from a single supply (3 V or 5 V). It can handle unipolar input signal ranges of 0 mV to 20 mV, 0 mV to 80 mV, 0 V to 1.25 V and 0 V to 2.5 V. It can also handle bipolar input signal ranges of ±20 mV, ±80 mV, ±1.25 V and ±2.5 V. These bipolar ranges are referenced to the negative input of the differential analog input. The AD7715 thus performs all signal conditioning and conversion for a single channel system.

The AD7715 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 update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system.

CMOS construction ensures very low power dissipation, and power-down mode reduces the standby power consumption to 50 μW typical. The part is available in a 16-lead, 0.3 inch-wide, plastic dual-in-line package (PDIP) as well as a 16-lead 0.3 inch wide small outline (SOIC_W) package and a 16-lead TSSOP package.

Product Highlights

  1. The AD7715 consumes less than 450 μA in total supply current at 3 V supplies and 1 MHz master clock, making it ideal for use in low-power systems. Standby current is less than 10 μA.
  2. The programmable gain input allows the AD7715 to accept input signals directly from a strain gage or transducer removing a considerable amount of signal conditioning.
  3. The AD7715 is ideal for microcontroller or DSP processor applications with a three-wire serial interface reducing the number of interconnect lines and reducing the number of optocouplers required in isolated systems. The part contains on-chip registers which allow software control over output update rate, input gain, signal polarity, and calibration modes.
  4. The part features excellent static performance specifications with 16-bits no missing codes, ±0.0015% accuracy, and low rms noise (<550 nV). Endpoint errors and the effects of temperature drift are eliminated by on-chip calibration options, which remove zero-scale and full-scale errors.

FEATURES and BENEFITS

  • Charge-balancing ADC
    16-bits no missing codes
    0.0015% nonlinearity
  • Programmable gain front end
    Gains of 1, 2, 32 and 128
    Differential input capability
  • Three-wire serial interface
  • SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible
  • Ability to buffer the analog input
  • 3 V (AD7715-3) or 5 V (AD7715-5) operation
  • Low supply current: 450 μA maximum @ 3 V supplies
  • Low-pass filter with programmable output update
  • 16-lead SOIC/PDIP/TSSOP

Functional Block Diagram for AD7715

Documentation

Title Content Type File Type
AD7715: 3V/5V, 450 uA, 16-Bit Sigma-Delta ADC Data Sheet (Rev D, 12/2009) (pdf, 474 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
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
Finding the Needle in a Haystack: Measuring small differential voltages in the presence of large common-mode voltages
(Analog Dialogue, Vol. 34, No. 1, January-February, 2000)
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
AD7715 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.

SampleSample & Buy

Price, packaging, availability

AD7715 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7715ACHIPS-3 Status: Production CHIPS OR DIE 0 Comm. Tray, 49 - - Y  Material Info PCN Purchase
AD7715ACHIPS-5 Status: Production CHIPS OR DIE 0 Comm. Tray, 49 - $8.48 Y  Material Info PCN Purchase
AD7715AN-5 Status: Production 16 ld PDIP 16 Ind Tube, 25 $8.01 $6.80 N  Material Info PCN Purchase
AD7715ANZ-3 Status: Production 16 ld PDIP 16 Ind Tube, 25 $7.14 $6.07 Y  Material Info PCN Purchase
AD7715ANZ-5 Status: Production 16 ld PDIP 16 Ind Tube, 25 $7.14 $6.07 Y  Material Info PCN Purchase
AD7715AR-3 Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $7.78 $6.60 N  Material Info PCN Purchase
AD7715AR-5 Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $7.78 $6.60 N  Material Info PCN Purchase
AD7715AR-5REEL Status: Production 16 ld SOIC - Wide 16 Ind Reel, 1000 - $6.60 N  Material Info PCN Purchase
AD7715ARU-3REEL Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 2500 - $6.60 N  Material Info PCN/PDN Purchase
AD7715ARU-3REEL7 Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 1000 - $6.60 N  Material Info PCN/PDN Purchase
AD7715ARU-5 Status: Last Time Buy 16 ld TSSOP 16 Ind Tube, 96 $8.17 $6.93 N  Material Info PCN/PDN Purchase
AD7715ARU-5REEL Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 2500 - $6.93 N  Material Info PCN/PDN Purchase
AD7715ARUZ-3 Status: Production 16 ld TSSOP 16 Ind Tube, 96 $7.28 $6.18 Y  Material Info PCN Purchase
AD7715ARUZ-3REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $6.18 Y  Material Info PCN Purchase
AD7715ARUZ-5 Status: Production 16 ld TSSOP 16 Ind Tube, 96 $6.93 $5.89 Y  Material Info PCN Purchase
AD7715ARUZ-5REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $5.89 Y  Material Info PCN Purchase
AD7715ARZ-3 Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $6.93 $5.89 Y  Material Info PCN Purchase
AD7715ARZ-3REEL Status: Production 16 ld SOIC - Wide 16 Ind Reel, 1000 - $5.89 Y  Material Info PCN Purchase
AD7715ARZ-5 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $6.93 $5.89 Y  Material Info PCN Purchase
AD7715ARZ-5REEL Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $5.89 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.

AD7715 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7715-3EBZ Status: Last Time Buy Evaluation Board - Yes - Contact ADI

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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