AD7190 4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA

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

Features and Benefits

RMS noise: 8.5 nV @ 4.7 Hz (gain = 128)
16 noise free bits @ 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
Qualified for automotive applications
See Data Sheet for Additional Information

Analog to Digital Converters

A/D Converters

Design Tools

Reference Designs

CN0102 Design & Integration Files .ZIP

Data Sheets

Document	note
AD7190: 4.8 kHz Ultralow Noise 24-Bit Sigma-Delta ADC with PGA Data Sheet (Rev. C)	PDF 300 kB

Application Notes

Document	note
AN-1131: Chopping on the AD7190, AD7192, AD7193, AD7194, and AD7195 (Rev. 0)	PDF 125 kB
AN-0979: Digital Filtering Options: AD7190, AD7192 (Rev. 0)	PDF 141 kB
AN-1084: Channel Switching: AD7190, AD7192, AD7193, AD7194, AD7195 (Rev. 0)	PDF 118 kB
AN-1069: Zero Latency for the AD7190, AD7192, AD7193, AD7194, and AD7195 (Rev. 0)	PDF 82 kB