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AD7608:  8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC

Product Details

Product Status:Recommended for New Designs

The AD7608 is an 18-bit, 8 channel, simultaneous sampling Analog-to-Digital Data Acquisition system (DAS). The part contains analog input clamp protection, 2nd order anti-alias filter, track and hold amplifier, 18-bit charge redistribution successive approximation ADC, flexible digital filter, 2.5V reference and reference buffer and high speed serial and parallel interfaces.

The AD7608 operates from a single 5V supply and can accommodate ± 10V and ±5V true bipolar input signals while sampling at throughput rates up to 200 kSPS for all channels. The input clamp protection circuitry can tolerate voltages up to ±16.5V. The AD7608 has 1 MΩ analog input impedance regardless of sampling frequency. The single supply operation, on chip filtering and high input impedance eliminates the need for driver op-amps and external bipolar supplies. The AD7608 antialias filter has a 3 dB cut off frequency of 22 kHz and provides 40 dB anti-alias rejection when sampling at 200ksps. The flexible digital filter is pin driven, yields improvements in SNR, and reduces the 3 dB bandwidth.


Applications
  • Power line monitoring and protection systems
  • Multiphase Motor Control
  • Instrumentation and control systems
  • Multi-axis positioning systems
  • Data Acquisition Systems

FEATURES and BENEFITS

  • 8 Simultaneously Sampled Inputs
  • True bipolar analog input ranges: ±10 V, ±5 V
  • Single 5V Analog Supply, 2.3V to +5V VDRIVE
  • 1MΩ Analog Input Impedance
  • 2nd Order Anti-alias Analog Filter
  • 7kV ESD rating on Analog input channels
  • Analog Input Over Voltage Clamp Protection
  • Over-sampling capability with digital filter,
    e.g. 96dB SNR at 50 ksps
  • Fast throughput rate: 200 kSPS for all channels
  • 90dB SNR at 200ksps
  • Low power: 80 mW at 200 kSPS, 10 mW per channel
  • On-chip accurate reference and reference buffer
  • See data sheet for additional features

AD7608 Functional Block Diagram

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Documentation

Title Content Type File Type
AD7608: 8-Channel DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC Data Sheet (Rev A, 02/2012) (pdf, 1292 kB) Data Sheets 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

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.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended External 2.5V Voltage Reference for the AD7608

  • For high accuracy, low noise and excellent long term stability, we recommend the ADR421.
  • For high accuracy, low noise and higher output current, we recommend the ADR431.
Recommended Digital Isolators for the AD7608
  • For high performance, low power, bidirectional communication, we recommend the ADuM1402.
  • For isolated power in 3.3V or 5V outputs, we recommend the ADuM5000 isolated DC-DC converter.
  • For high performance, low power, bidirectional communication with integrated isolated power, we recommend the ADuM5402.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7608 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.

AD7608 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7608EDZ Status: Production Evaluation Board $150.00 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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