AD7190BRUZ-REEL

AD7190 is a low-noise, complete analog front end designed for high-precision measurement applications, incorporating a low-noise, 24-bit Σ-Δ ADC. The on-chip low-noise programmable gain stage allows small signals to be applied directly to the input. The device can be configured for two differential inputs or four pseudo-differential inputs. The on-chip channel sequencer can enable multiple channels, and the AD7190 performs conversions sequentially across all enabled channels, simplifying communication with the device. The on-chip 4.92MHz clock can serve as the ADC clock source; alternatively, an external clock or crystal can be used. The output data rate is programmable from 4.7Hz to 4.8kHz. The device offers two digital filter options. The choice of filter affects RMS noise and noise-free resolution at the programmed output data rate, settling time, and 50Hz/60Hz rejection. For applications requiring settled output on every conversion, the AD7190 features a zero-latency option. The device operates from a 5V analog supply and a 2.7V to 5.25V digital supply, with 6mA power consumption, and is available in a 24-lead TSSOP package.

Applications

• Electronic scales
• Strain gauge sensors
• Pressure measurement
• Temperature measurement
• Chromatographs
• PLC/DCS analog input modules
• Data acquisition
• Medical and scientific instruments

Key features

• RMS noise: 8.5 nV (4.7 Hz, G = 128)
• 16-bit noise-free resolution (2.4 kHz, G = 128)
• Up to 22.5-bit noise-free resolution (G = 7)
• Offset drift: 5 nV/°C
• Gain drift: 1 ppm/°C
• Stable time drift characteristics
• 2 differential / 4 pseudo-differential input channels
• Auto 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
• 4 general-purpose digital outputs
• Supply voltage 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
• Interface: 3-wire serial interface, SPI, QSPI, MICROWIRE, and DSP compatible, Schmitt trigger on SCLK