AD7657-1:  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 14-Bit ADC

The AD7656-1/AD7657-1/AD7658-11 are reduced decoupling pin- and software-compatible versions of AD7656/AD7657/AD7658. The AD7656-1/AD7657-1/AD7658-1 devices contain six 16-/ 14-/12-bit, ...続きを見る

AD7657-1:  250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 14-Bit ADC

製品概要

The AD7656-1/AD7657-1/AD7658-11 are reduced decoupling pin- and software-compatible versions of AD7656/AD7657/AD7658. The AD7656-1/AD7657-1/AD7658-1 devices contain six 16-/ 14-/12-bit, fast, low power successive approximation ADCs in a package designed on the iCMOS® process (industrial CMOS). iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs capable of 33 V operation in a footprint that no previous generation of high voltage parts could achieve. Unlike analog ICs using conven-tional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, which dramatically reduces power consumption and package size.

The AD7656-1/AD7657-1/AD7658-1 feature throughput rates up to 250 kSPS. The parts contain low noise, wide bandwidth, track-and-hold amplifiers that can handle input frequencies up to 4.5 MHz.

The conversion process and data acquisition are controlled using the CONVST signals and an internal oscillator. Three CONVST pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656-1/AD7657-1/AD7658-1 have a high speed parallel and serial interface, allowing the devices to interface with microprocessors or DSPs. When the serial interface is selected, each part has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656-1/ AD7657-1/AD7658-1 can accommodate true bipolar input signals in the ±4 × VREF range and ±2 × VREF range. The AD7656-1/ AD7657-1/AD7658-1 also contain an on-chip 2.5 V reference.

1Protected by U.S. Patent No. 6,731,232.

Applications

  • Power line monitoring systems
  • Instrumentation and control systems
  • Multi-axis positioning systems

    • Product Highlights

    1. Six 16-/14-/12-bit, 250 kSPS ADCs on board
    2. Six true bipolar, high impedance analog inputs
    3. Parallel and high speed serial interfaces
    4. Reduced decoupling requirements and reduced bill of materials
      cost compared with the AD7656/AD7657/ AD7658 devices.

    Data Sheet, Rev. 0, 8/08

    Features

    • Pin and software compatible with AD7656/AD7657/AD7658 featuring reduced decoupling requirements
    • 6 independent ADCs
    • True bipolar analog inputs
    • Pin-/software-selectable ranges: ±10 V, ±5 V
    • Fast throughput rate: 250 kSPS
    • iCMOS process technology
    • Low power
      140 mW at 250 kSPS with 5 V supplies
    • See Data Sheet for Additional Information

    Diagrams

    AD7657-1 Diagram
    Functional Block Diagram for AD7657-1

    仕様

    Resolution (Bits) 14bit
    T-Put Rate 250kSPS
    # Chan 6
    Supply V (±15, +5An, +5Dig, +3Drv),(±15, +5An, +5Dig, +5Drv),(±5, +5An, +5Dig, +3Drv),(±5, +5An, +5Dig, +5Drv)
    Pwr Diss (max) 140mW
    Interface Par,Ser,SPI
    Ain Range 10V p-p,20 V p-p,Bip 10V,Bip 20V
    SNR (dB) 83.5dB
    Pkg Type QFP

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    新製品情報のRSSフィードを取得 続きを見る
    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD7657-1 14 250KSPS 6 140mW
    AD7949 14 250KSPS 8 13.5mW
    AD7856 14 285KSPS 8 89.25mW
    AD7367 14 1MSPS 4 88.7mW
    AD7656-1 16 250KSPS 6 140mW
    AD7658-1 12 250KSPS 6 140mW
    AD7367-5 14 500KSPS 2 54.5mW