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AD7760:  2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer

Product Details


The AD7760 is a high performance, 24-bit Σ-Δ analog-to-digital converter (ADC). It combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion to achieve a performance of 100 dB SNR at 2.5 MSPS, making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced antialiasing requirements simplify the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an overrange flag, internal gain and offset registers, and a low-pass digital FIR filter make the AD7760 a compact, highly integrated data acquisition device requiring minimal peripheral component selection. In addition, the device offers programmable decimation rates, and the digital FIR filter can be adjusted if the default characteristics are not appropriate for the application. The AD7760 is ideal for applications demanding high SNR without a complex front-end signal processing design.

The differential input is sampled at up to 40 MSPS by an analog modulator. The modulator output is processed by a series of low-pass filters, with the final filter having default or user-programmable coefficients. The sample rate, filter corner frequencies, and output word rate are set by a combination of the external clock frequency and the configuration registers of the AD7760.

The reference voltage supplied to the AD7760 determines the analog input range. With a 4 V reference, the analog input range is ±3.2 V differential biased around a common mode of 2 V. This common-mode biasing can be achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.

The AD7760 is available in an exposed paddle, 64-lead TQFP and is specified over the industrial temperature range from −40°C to +85°C.

Applications

  • Data acquisition systems
  • Vibration analysis
  • Instrumentation

FEATURES and BENEFITS

  • Chinese data sheet available
  • 120 dB dynamic range at 78 kHz output data rate
  • 100 dB dynamic range at 2.5 MHz output data rate
  • 112 dB SNR at 78 kHz output data rate
  • 100 dB SNR at 2.5 MHz output data rate
  • 2.5 MHz maximum fully filtered output word rate
  • Fully differential modulator input
  • Programmable oversampling rate (8X to 256X)
  • On-chip differential amplifier for signal buffering
  • Low-pass finite impulse response (FIR) filter with default or user-programmable coefficients
  • Modulator output mode
  • Overrange alert bit
  • Digital offset and gain correction registers

Functional Block Diagram for AD7760

Of Note ...

Find out how to optimize the performance of the AD7760 by viewing AD7760 : Tips & Solutions to Aid Optimum Performance

Documentation

Title Content Type File Type
AD7760: 2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer Data Sheet  (Rev A, 08/2006) (pdf, 912 kB) Data Sheets PDF
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging  (pdf, 217 kB) Application Notes PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
AN-342: Analog Signal-Handling for High Speed and Accuracy.  (pdf, 468 kB)
Signal handling techniques for optimizing DAC and ADC performance.
Application Notes PDF
AN-280: Mixed Signal Circuit Technologies  (pdf, 2101 kB)
Considers problems which arise when reality (& Murphy) intervene in a design which otherwise seems satisfactory in terms of theory and modeling.
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
Two Fast, Two Accurate A/D Converters Help Eliminate Front-end Conditioning
(eeProductCenter Reviews. 6/28/04)
Product Reviews HTML
18-Bit SAR, 20-Bit Delta-Sigma ADCs Up The Ante On Converter Specs
(ED Online, 8/9/2004)
Product Reviews HTML
AD7760 : Tips & Solutions to Aid Optimum Performance Overview HTML
New 18- and 24-bit ADCs reduce design complexity, time, and cost.  (pdf, 617 kB)
(Downloadable PDF)
Overview PDF
RAQs index Rarely Asked Questions 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

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 Driver Amplifiers for the AD7760

  • For low noise and low power applications, we recommend the ADA4841-1.
  • For low noise, low power and low frequency, we recommend the OP184.
  • For low noise and high frequency, try the AD8021 or the dual AD8022.
  • For low power, low frequency, small package, we recommend the AD8519.
  • For high frequency and low power, we suggest the AD8031.
Recommended Voltage Reference for the AD7760
  • For high precision, ultralow noise and high output source and sink current, we recommend the ADR431 (2.5V reference) or the ADR434 (4.096V reference).
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7760 Model Options
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.

AD7760 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7760EDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-CED1Z Status: Production Evaluation Board $249.00 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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