AD7195BCPZ

AD7195 is a low noise, complete analogue front end for high precision measurement applications. It contains a low noise, 24bit sigma-delta (Σ-Δ) analogue-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 AD7195 contains ac excitation, which is used to remove dc-induced offsets from bridge sensors. 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 AD7195 sequentially converts on each enabled channel. Typical application includes weigh scales, strain gauge transducers, pressure measurement, temperature measurement, chromatography, PLC/DCS analogue input modules, data acquisition and medical and scientific instrumentation.

• AC or DC sensor excitation
• RMS noise: 8.5nV at 4.7Hz (G=128), 16 noise-free bits at 2.4KHz (G= 128)
• Offset drift: 5nV/°C, gain drift: 1ppm/°C, programmable gain (1 to128) and specified drift over time
• 2 differential/4 pseudo differential input channels, automatic channel sequencer
• Output data rate: 4.7Hz to 4.8KHz
• Internal or external clock and simultaneous 50Hz/60Hz rejection
• Power supply AVDD: 4.75V to 5.25V, DVDD: 2.7V to 5.25V and current: 6mA
• 3-wire serial SPI, QSPI™, MICROWIRE™, DSP compatible and Schmitt trigger on SCLK
• 32 lead LFCSP package
• Operating temperature range from -40 to 105°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party