Analog Devices Inc. AD7190 24-Bit Sigma-Delta ADC

Analog Devices Inc. AD7190 24-Bit Sigma-Delta ADC is offered as a low-noise, complete analog front end designed for high-precision measurement applications. AD7190 includes a low-noise, 24-bit sigma-delta (∑-Δ) analog-to-digital converter (ADC). An on-chip, low-noise gain stage allows small amplitude signals to interface directly to the ADC. Designers can configure the device with two differential inputs or four pseudo-differential inputs. Analog Devices AD7190 ADC delivers an output data rate of 4.7Hz to 4.8kHz and provides two digital filter options. The AD7190 operates with a 5V analog power supply and a digital power supply from 2.7V to 5.25V. This device consumes a current of 6mA and is available in a 24-lead TSSOP package.

Features

RMS noise: 8.5nV @ 4.7Hz (gain = 128)
16 noise-free bits @ 2.4kHz (gain = 128)
Up to 22.5 noise-free bits (gain = 1)
Offset drift: 5nV/°C
Gain drift: 1ppm/°C
Specified drift over time
2 differential/4 pseudo-differential input channels
Automatic channel sequencer
Programmable gain (1 to 128)
Output data rate: 4.7Hz to 4.8kHz
Internal or external clock
Simultaneous 50Hz/60Hz rejection

4 general-purpose digital outputs
Power supply
- AVDD: 4.75V to 5.25V
- DVDD: 2.7V to 5.25V
Current: 6mA
Temperature range: –40°C to +105°C
Interface
- 3-wire serial
- SPI, QSPI™, MICROWIRE™, and DSP compatible
- Schmitt trigger on SCLK
Qualified for automotive applications