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AD7725:  16-Bit Sigma Delta ADC with a Programmable Post Processor

The AD7725 is a complete 16-bit, sigma-delta analog to digital converter with on chip user-programmable signal conditioning. The output of the modulator is processed by three cascaded finite impulse response (FIR) filters, followed by a user-programmable post processor. The user has complete control over the filter response, the filter coefficients and the decimation ratio.

The AD7725 is ...More

AD7725:  16-Bit Sigma Delta ADC with a Programmable Post Processor

Product Description

The AD7725 is a complete 16-bit, sigma-delta analog to digital converter with on chip user-programmable signal conditioning. The output of the modulator is processed by three cascaded finite impulse response (FIR) filters, followed by a user-programmable post processor. The user has complete control over the filter response, the filter coefficients and the decimation ratio.

The AD7725 is specified for input bandwidths up to 300 kHz and an output word rate of 600 kHz maximum. The input sample rate is set either by the crystal oscillator or an external clock, , which has a specified value of 9.6MHz and a maximum value of 14.4MHz. The CLKIN frequency directly determines the maximum input bandwidth of the device with the relationship being BW (max) = CLKIN/32. The conversion data is available via a serial or parallel interface.

To program the Post Processor, either the on-chip, default filter or a user-defined filter in the form of a configuration file can be loaded into the device. The user-defined filter can be loaded from a DSP or an external EPROM with a serial interface or from a DSP with a parallel interface.

The user-defined filter configuration file can be generated using a digital filter design package called 'Filter Wizard'. This package allows the user to design different filter types and generates the appropriate configuration file to be loaded to the device.

RESOURCES & TOOLS

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EVALUATION BOARDS & DEVELOPMENT KITS

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TOOLS, SOFTWARE & SIMULATION MODELS

  • Programmable Filtering
    - Any Characteristic up to 108 Tap FIR and/or IIR
  • Polynomial Signal Conditioning up to 8th Order
  • Flexible Programming Modes
    - Boot from DSP or External EPROM
    - Parallel/Serial Interface
  • Internal Default Filter for Evaluation
  • Programmable Decimation and Output Word Rate
  • 14.4 MHz Max Master Clock Frequency
  • 0 V to +4 V (Single-Ended) or ±2 V (Differential) Input Range
  • Power Supplies: AVDD, DVDD: 5 V ± 5%
  • On-Chip 2.5 V Voltage Reference
  • 44-Lead MQFP Package
  • Resolution (Bits): 16bit
  • T-Put Rate: 900kSPS
  • # Chan: 1
  • Supply V: Single(+5)
  • Pwr Diss: 615mW
  • Interface: Par,Ser
  • Ain Range: 4 V p-p,Uni 4.0V
  • SNR (dB): 83dB
  • Pkg Type: QFP

Functional Block Diagram for AD7725

Of Note ...

Visit an overview of the AD7725 Development Tools for extended information on this new Programmable Sigma-Delta Converter!

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AD7621 16 3MSPS 1 86mW
AD7622 16 2MSPS 1 85mW
AD7623 16 1.33MSPS 1 55mW
AD7625 16 6MSPS 1 145mW
AD7626 16 10MSPS 1 150mW
AD7401A 16 20MSPS 1 105mW
AD7653 16 1MSPS 1 145mW
AD7667 16 1MSPS 1 145mW
AD7671 16 1MSPS 1 125mW
AD7400A 16 10MSPS 1 95mW
AD7677 16 1MSPS 1 130mW
AD7400 16 10MSPS 1 90mW
AD7983 16 1.33MSPS 1 12mW
AD7720 16 12.5MSPS 1 215mW
AD7401 16 20MSPS 1 100mW
AD7723 16 1.2MSPS 1 475mW
AD7725 16 900KSPS 1 615mW
AD7980 16 1MSPS 1 10mW
AD9261-10 16 160MSPS 1 375mW
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Pricing, Packaging & Availability

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For detailed drawings and chemical composition please consult our  Package Site

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  • Military : -55 to +125 degrees Celsius
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  • Automotive: -40 to +125 degrees Celsius
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*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.