GENERAL DESCRIPTION
●The AD7194 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 interface directly to the ADC.
●FEATURES
●Fast settling filter option
●8 differential/16 pseudo differential input channels
●RMS noise: 11 nV at 4.7 Hz (gain = 128)
●15.5 noise-free bits at 2.4 kHz (gain = 128)
●Up to 22 noise-free bits (gain = 1)
●Offset drift: ±5 nV/°C
●Gain drift: ±1 ppm/°C
●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
●Power supply
● AVDD: 3 V to 5.25 V
● DVDD: 2.7 V to 5.25 V
●Current: 4.65 mA
●Temperature range: −40°C to +105°C
●Package: 32-lead LFCSP
●Interface
● 3-wire serial
● SPI, QSPI™, MICROWIRE™, and DSP compatible
● Schmitt trigger on SCLK
●APPLICATIONS
●PLC/DCS analog input modules
●Data acquisition
●Strain gage transducers
