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AD7195:  4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA and AC Excitation

Product Details

Product Status:Recommended for New Designs

The AD7195 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 be interfaced directly to the ADC. The AD7195 contains ac excitation, which is used to remove dc-induced offsets from bridge sensors.

The device can be configured to have two differential inputs or four pseudo differential inputs. The on-chip channel sequencer allows several channels to be enabled, and the AD7195 sequentially converts on each enabled channel. This simplifies communication with the part. 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 two digital filter options. The choice of filter affects the rms noise/noise-free resolution at the programmed output data rate, the settling time, and the 50 Hz/60 Hz rejec-tion. For applications that require all conversions to be settled, the AD7195 includes a zero latency feature. The part operates with a 5 V analog power supply and a digital power supply from 2.7 V to 5.25 V. It consumes a current of 6 mA. It is housed in a 32-lead LFCSP package.


Applications
  • Weigh scales
  • Strain gage transducers
  • Pressure measurement
  • Temperature measurement

FEATURES and BENEFITS

  • AC or DC sensor excitation
  • RMS noise: 8.5 nV at 4.7 Hz (gain = 128)
  • 16 noise-free bits at 2.4 kHz (gain = 128)
  • Up to 22.5 noise-free bits (gain = 1)
  • Offset drift: 5 nV/°C
  • Gain drift: 1 ppm/°C
  • Specified drift over time
  • 2 differential/4 pseudo differential input channels
  • Automatic channel sequencer
  • Programmable gain (1 to 128)
  • Output data rate: 4.7 Hz to 4.8 kHz
  • See data sheet for additional features

Functional Block Diagram for AD7195

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
AD7190 - Microcontroller No-OS Driver Device Drivers HTML
AD7192 IIO High Precision ADC Linux Driver (Wiki Site) Device Drivers 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

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Companion Products

Suggested Companion Products


Recommended Precision References for the AD7195

  • For low noise and low power applications, we recommend the ADR421.
  • For high current output applications, try the ADR431.
Recommended Precision Driver Amplifiers for the AD7195
  • For low noise and low power applications, we recommend the ADA4051-2.
  • For more precision and great temperature dirft specs, we recommend the AD8539.
  • For higher supply voltages up to +-8V, we recommend the AD8639.
Recommended Digital Isolators for the AD7195
  • For isolated data and power, we recommend the ADuM3470 family in various channel configurations.
Recommended Linear Regulators for the AD7195
  • For powering the separate AVdd and DVdd supplies, we recommend the ADP3303.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7195 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.

AD7195 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7195EBZ 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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