Alternative Parts

Overview

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
  • Internal or external clock
  • Simultaneous 50 Hz/60 Hz rejection
  • Power supply
    • AVDD: 4.75 V to 5.25 V
    • DVDD: 2.7 V to 5.25 V
  • Current: 6 mA
  • Temperature range: –40°C to +105°C
  • Package: 32-lead LFCSP

Product Details

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 rejection. 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
  • Chromatography
  • PLC/DCS analog input modules
  • Data acquisition
  • Medical and scientific instrumentation

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Documentation & Resources

  • View All (13)
  • Data Sheets (1)
  • Application Notes (4)
  • User Guides (1)
  • Frequently Asked Questions (1)
  • Tutorials (1)
  • Circuit Note (1)
  • Videos (3)
  • Technical Articles (1)
  • Tools & Simulations

    Virtual Eval - BETA

    Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.

    VirtualEval

    Product Recommendations

    AD7195 Companion Parts

    Recommended Precision Driver Amplifiers

    • For higher supply voltages up to +-8V: AD8639.
    • For low noise and low power applications: ADA4051-2.
    • For more precision and great temperature dirft specs: AD8539.

    Recommended Precision References

    • For high current output applications, try the ADR431.: ADR431.
    • For low noise and low power applications: ADR421.

    Recommended Digital Isolators

    • For isolated data and power: ADUM3470.

    Recommended Linear Regulators

    • For powering the separate AVdd and DVdd supplies: ADP3303.

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

    PCN-PDN Information

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    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.