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AD7194:  8-Channel, 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA

Product Details


The AD7194 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can interface directly to the ADC. The device can be configured to have eight differential inputs or sixteen pseudo differential inputs. The on-chip 4.92 MHz clock can be used as the clock source to the ADC or, alternatively, an external clock or crystal can be used. The output data rate from the part can be varied from 4.7 Hz to 4.8 kHz.

The device has a very flexible digital filter, including a fast settling option. Variables such as output data rate and settling time are dependent on the option selected. For applications that require all conversions to be settled, the AD7194 includes zero latency.

The part operates with a power supply from 3 V to 5.25 V. It consumes a current of 4.65 mA, and it is housed in a 32-lead LFCSP package.

Applications
  • PLC/DCS analog input modules
  • Data acquisition
  • Strain gage transducers
  • Pressure measurement
  • Temperature measurement
  • Flow measurement
  • Weigh scales
  • Chromatography
  • Medical and scientific instrumentation

FEATURES and BENEFITS

  • Fast settling filter option
  • 8 differential/16 pseudo differential input channels
  • RMS noise: 11 nV at 4.7 Hz (gain = 128)
  • 15.5 noise-free bits at 2.4 kHz (gain = 128)
  • Up to 22 noise-free bits (gain = 1)
  • Offset drift: ±5 nV/°C
  • Gain drift: ±1 ppm/°C
  • Programmable gain (1 to 128)
  • Output data rate: 4.7 Hz to 4.8 kHz
  • Internal or external clock
  • Simultaneous 50 Hz/60 Hz rejection
  • See data sheet for additional features

Functional Block Diagram for AD7194

Learn how the ADC Active Functional Model is used to evaluate and debug the AD719x

Design Tools,Models,Drivers & Software

Title Content Type File Type
Digital Filter Model Spreadsheets
These spreadsheet tools show the response of the digital filter section of the AD71xx and AD77xx devices based on input parameters.
Design Calculators 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 Driver Amplifier for the AD7194

  • For a low noise, low distortion, rail-to-rail output, differential driver, we recommend the ADA4940-1.
  • For a precision, general purpose, rail-to-rail, single-ended input, we recommend the AD8628.
Recommended Precision Reference for the AD7194
  • For low noise, high accuracy, 2.5V reference, we recommend the ADR421 or the ADR431.
  • For low noise, high accuracy, 5V reference, we recommend the ADR425.
Recommended Digital Isolators for the AD7194
  • For a low cost standard digital isolator, we recommend the ADuM1411 or the ADuM1412.
  • For a digital isolator with isoPower, we recommend the ADuM5401 or the ADuM5402.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7194 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.

AD7194 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7194EBZ Status: Production Evaluation Board $59.00 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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