AD7656:  250 kSPS, 6-Channel, Simultaneous Sampling Bipolar 16-Bit A/D Converter

The AD7656 contains six 16-bit, fast, low power, successive approximation ADCs all in the one package. The part AD7656 core operates from a single 4.5 V to 5.5 V power supply and features throughput ...More

AD7656:  250 kSPS, 6-Channel, Simultaneous Sampling Bipolar 16-Bit A/D Converter

Product Description

The AD7656 contains six 16-bit, fast, low power, successive approximation ADCs all in the one package. The part AD7656 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 AD7656 has both a high speed parallel and serial interface allowing the devices to interface with microprocessors or DSPs. When in Serial interface mode the AD7656 has a Daisy Chain feature allowing multiple ADCs to connect to a single serial interface. There are no pipelined delays associated with the part.

The AD7656 can accommodate true bipolar input signals in the range ±10V . The AD7656 contains a 2.5V internal reference. The AD7656 can also accept an external reference. If a 3V external reference is applied to the VREF pin, the ADCs can accommodate a true bipolar ±12V analog input range. VDD and VSS supplies of ±12V are required for this ±12V input range.

The AD7656 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 AD7656 to accept high voltage bipolar signals in addition to reducing power consumption and package size. The AD7656 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 16-bit 250 kSPS ADCs on board.
  2. Six true bipolar high impedance analog inputs.
  3. The AD7656 features both a parallel and a high speed serial interface.

Applications

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

Features

  • 6 Independent 16-Bit ADCs
  • 6 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: 86 dB SNR at 50 kHz input frequency
  • On-chip Reference and Reference Buffers
  • Parallel and Serial Interface
  • High speed serial interface: SPI/QSPI/µWire/DSP compatible
  • No pipeline delays
  • Standby Mode: -5 µA max

Diagrams

AD7656 Diagram
Functional Block Diagram for AD7656

Specifications

Resolution (Bits) 16bit
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) 86.5dB
Pkg Type QFP

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Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
AD7656 16 250KSPS 6 143mW
AD7656-1 16 250KSPS 6 140mW
AD7654 16 500KSPS 4 135mW
AD7655 16 1MSPS 4 135mW
AD7657 14 250KSPS 6 143mW
AD7657-1 14 250KSPS 6 140mW
AD7682 16 250KSPS 4 19.2mW
AD7689 16 250KSPS 8 19.2mW
AD7658 12 250KSPS 6 143mW
AD7658-1 12 250KSPS 6 140mW
AD7400 16 10MSPS 1 90mW
Pricing, Packaging & Availability

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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.

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