AD7190

4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA
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Product Details

The AD7190 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 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 AD7190 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 AD7190 includes a zero latency feature.

The part operates with 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 24-lead TSSOP package.

Applications

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

Product Lifecycle

checked Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits

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Product Details

The EVAL-AD7190EBZ is a fully featured evaluation board for the AD7190. The evaluation board can be operated in standalone mode ( either battery-powered or with external power supply) or connected to a PC via a standard USB interface. When operated with a PC, software is provided enabling the user to perform detailed analysis of the ADC's performance.


Tools & Simulations

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Design Tools

Product Recommendations

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AD7190 Companion Parts

Recommended Precision Driver Amplifiers

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

Recommended Precision References

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

Recommended Digital Isolators

  • For isolated data and power , we recommend the ADUM3470 .

Recommended Linear Regulators

  • For powering the separate AVdd and DVdd supplies , we recommend the ADP3303 .

Design Resources

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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.

AD7190 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

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Reviews

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Overview

4 Reviews
3 out of 4 (75%) customers recommend this product.
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Most Helpful Review

by LSI-guy
I am using 3 of these devices connected to 1 SPI port on a Cortex M4. I am getting very good results which match up to the specifications of the device. I am able to command all 3 parts simultaneously by asserting all chip selects when sending commands. The data must be read with only 1 chip select asserted of coarse. The parts were commanded to continuous conversion mode and a continuous read command was sent to all devices. Channel 0 is the master device which interrupts the processor when the channel 0 conversion is complete. The processor then reads the data from all devices in the ISR. I was receiving errors until this clock fix was implemented. The trick was to use a common clock for all 3 devices. The internal clock from Channel 0 is brought out to the MCLK2 pin. This is connected to the MCLK2 pin of channels 1,2. The parts are programmed as follows. The channel 0 internal clock is the master and channels 1,2 are slaves which use the internal clock from channel 0. Works great now.

Most Recent Review

by tones
Generally a very stable and low-noise A/D One feature I would like to see: - true +/- differential mode, i.e. integrated level shifters - DIP packaging

All Reviews

by tones, 28 Mar 14
7190
Generally a very stable and low-noise A/D One feature I would like to see: - true +/- differential mode, i.e. integrated level shifters - DIP packaging
Was this Helpful?Helpful(0)
by LSI-guy, 21 Nov 13
AD7190 Review
I am using 3 of these devices connected to 1 SPI port on a Cortex M4. I am getting very good results which match up to the specifications of the device. I am able to command all 3 parts simultaneously by asserting all chip selects when sending commands. The data must be read with only 1 chip select asserted of coarse. The parts were commanded to continuous conversion mode and a continuous read command was sent to all devices. Channel 0 is the master device which interrupts the processor when the channel 0 conversion is complete. The processor then reads the data from all devices in the ISR. I was receiving errors until this clock fix was implemented. The trick was to use a common clock for all 3 devices. The internal clock from Channel 0 is brought out to the MCLK2 pin. This is connected to the MCLK2 pin of channels 1,2. The parts are programmed as follows. The channel 0 internal clock is the master and channels 1,2 are slaves which use the internal clock from channel 0. Works great now.
Was this Helpful?Helpful(2)
by Anonymous, 14 Jan 13
To low throughput in multichannel mode
The throughput in multichannel mode is to low. Or rather the settling time/channel is to long for real world applications. My plan was to use the AD for a multichannel weight indicator where each channel measured a single loadcell, one loadcell in each corner of the scale. Ideally this should enable me to make runtime corner adjustment of the scale. However due to the very long settling time, I cannot read all 4 corners, let them settle and then perform the correction within the required time interval. In my case I would ideally want at minimum 4-8 output updates/second, where each update reads all four loadcells. This means I needs about 8x4 (32) fully settled readings/second. Also I have not yet investigated the affect of the slow measuring when the weight is moving (rotating) on the scale (as in for example a container with fluids), when the sampling time is slow, we can end up in phase with the measured load and the summed output will be wrong. Ideally I think this chip would benefit from a dual interleaved AD core, whereas two ad converters (inc. PGA) can measure two channels simultaneously. In my project I instead ended up using an AD7730 + an fast 12 bit ad (used for correction only) with external multiplexers.
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by Anonymous, 7 Jan 13
Great 24-bit ADC with great performance
We achieved performance on par with what was reported in the datasheet even without an ideal PCB layout.
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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.