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.
|Title||Content Type||File Type|
|AD7190: 4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA Data Sheet (Rev C, 02/2013) (pdf, 300 kB)||Data Sheets|
|AN-1131: Chopping on the AD7190, AD7192, AD7193, AD7194, and AD7195 (pdf, 125 kB)||Application Notes|
|AN-1084: Channel Switching: AD7190, AD7192, AD7193, AD7194, AD7195 (pdf, 118 kB)||Application Notes|
|AN-1069: Zero Latency for the AD7190, AD7192, AD7193, AD7194, and AD7195 (pdf, 82 kB)||Application Notes|
|AN-0979: Digital Filtering Options: AD7190, AD7192 (pdf, 141 kB)||Application Notes|
|CN-0102: Precision Weigh Scale Design Using the AD7190 24-Bit Sigma-Delta ADC with Internal PGA (pdf)||Circuit Note|
AD7190 Active Functional ADC Model
This video demonstrates how the ADC Active Functional Model is used to evaluate and debug the AD7190. The AD7190 is a low noise, complete AFE for high precision measurement applications; it contains a 24-bit sigma-delta ADC & a low noise gain stage.
|Tutorial on Technical and Performance Benefits of AD719x Family (pdf, 4889 kB)||Tutorials|
|UG-222: Evaluation Board for the AD7190/AD7192 4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADCs (pdf, 1137 kB)||User Guides|
|MS-2210: Designing Power Supplies for High Speed ADC (pdf, 327 kB)||Technical Articles|
|Test & Instrumentation Solutions Bulletin, Volume 10, Issue 3 (pdf, 1334 kB)||Solutions Bulletins|
|FAQs for the AD719x family.||FAQs/RAQs||HTML|
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
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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.
|AD7190 - Microcontroller No-OS Driver||Device Drivers||HTML|
|AD7192 IIO High Precision ADC Linux Driver (Wiki Site)||Device Drivers||HTML|
Recommended Precision References for the AD7190
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