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AD7762:  625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC with On-Chip Buffer

Product Details


The AD7762 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 with a performance of 106 dB SNR at 625 kSPS, making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced anti-aliasing 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 AD7762 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 to the application. The AD7762 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, 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 AD7762.

The reference voltage supplied to the AD7762 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 AD7762 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

  • 120 dB dynamic range at 78 kHz output data rate
  • 109 dB dynamic range at 625 kHz output data rate
  • 112 dB SNR at 78 kHz output data rate
  • 106 dB SNR at 625 kHz output data rate
  • 625 kHz maximum fully filtered output word rate
  • Programmable over-sampling rate (32x to 256x)
  • Fully differential modulator input
  • On-chip differential amplifier for signal buffering
  • Low pass FIR filter with default or user programmable coefficients
  • Over-range alert bit
  • Digital offset and gain correction registers
  • Low power and power down modes

Functional Block Diagram for AD7762

Documentation

Title Content Type File Type
AD7762: 625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC With On-Chip Buffer Data Sheet (Rev A, 01/2014) (pdf, 561 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
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.

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Price, packaging, availability

AD7762 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.

AD7762 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7762EDZ 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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