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AD7658:  250 kSPS, 6-Channel,SimultaneousSampling, Bipolar 12-Bit A/D Converter

The AD7658 contains six 12-bit, fast, low power, successive approximation ADCs all in the one package. The AD7658 core operates from a single 4.5 V to 5.5 V power supply and features throughput rates up to 250 kSPS. The part contains low noise, wide bandwidth track-and-hold amplifiers that can handle input frequencies up to 8 MHz.

The conversion process and data acquisition are ...More

AD7658:  250 kSPS, 6-Channel,SimultaneousSampling, Bipolar 12-Bit A/D Converter

Product Description

The AD7658 contains six 12-bit, fast, low power, successive approximation ADCs all in the one package. The AD7658 core operates from a single 4.5 V to 5.5 V power supply and features throughput rates up to 250 kSPS. The part contains low noise, wide bandwidth track-and-hold amplifiers that can handle input frequencies up to 8 MHz.

The conversion process and data acquisition are controlled using CONVST signals and an internal oscillator. Three CONVST pins allow independent simultaneous sampling of the three ADC pairs. The AD7658 has both a high speed parallel and serial interface allowing the devices to interface with microprocessors or DSPs. When in Serial interface mode the parts have a Daisy Chain feature allowing multiple ADCs to connect to a single serial interface. There are no pipelined delays associated with the parts.

The AD7658 is fabricated on Analog Devices’ Industrial CMOS process, iCMOS™ , a technology platform combining the advantages of low and high voltage CMOS, bipolar and high voltage DMOS processes. The process enables the AD7658 to accept high voltage bipolar signals in addition to reducing power consumption and package size. The AD7658 can accommodate true bipolar input signals in the ±10V range and ±5V range . It contains a 2.5V internal reference and can also accept an external reference. If a 3V external reference is applied to the VREF pin, the ADC can accommodate a true bipolar ±12V analog input range. VDD and VSS supplies of ±12V are required for this ±12V input range.

Product Highlights

  1. Six 12-bit 250 kSPS ADCs on board.
  2. Six true bipolar high impedance analog inputs.
  3. The AD7658 features both a parallel and a high speed serial interface.

Applications

  • Power Line Monitoring systems
  • Instrumentation and control systems
  • Multi-axis positioning systems

    • * Protected by U.S. Patent No. 6,731,232

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • 6 Independent ADCs
    • True Bipolar Analog Inputs
    • Pin/Software Selectable Ranges:- ±10V, ±5V
    • Fast throughput rate: 250 kSPS per channel
    • Specified for AVCC of 4.75 V to 5.25 V
    • Low power: 160mW at 250 kSPS with 5 V supplies
    • Wide input bandwidth: 71 dB SNR at 50 kHz input frequency
    • On-chip Reference and Reference Buffers
    • Parallel and Serial Interface
    • SPI/QSPI/µWire/DSP compatible
    • Standby mode: 5 µA max
    • 64 LQFP package
    • Resolution (Bits): 12bit
    • T-Put Rate: 250kSPS
    • # Chan: 6
    • Supply V: Multi(±12, +5),Multi(±15, +5)
    • Pwr Diss: 143mW
    • Interface: Par,Ser,SPI
    • Ain Range: Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 5.0V
    • SNR (dB): 73.5dB
    • Pkg Type: QFP

    Functional Block Diagram for AD7658

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    AD7928 12 1MSPS 8 13.5mW
    AD7862 12 250KSPS 4 75mW
    AD7866 12 1MSPS 4 24mW
    AD7934 12 1.5MSPS 4 16mW
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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.