AD7795

www.DataSheet4U.com 6-Channel, Low Noise, Low Power, 24-/16-Bit ∑-Δ ADC with On-Chip In-Amp and Reference AD7794/AD7795 FEATURES Up to 23 effective bits RMS noise: 40 nV @ 4.17 Hz 85 nV @ 16.7 Hz Current: 400 μA typ Power-down: 1 μA max Low noise, programmable gain, instrumentation amp Band gap reference with 4 ppm/°C drift typ Update rate: 4.17 Hz to 470 Hz Six differential analog inputs Internal clock oscillator Simultaneous 50 Hz/60 Hz rejection Reference detect Programmable current sources On-chip bias voltage generator Burnout currents Low-side power switch Power supply: 2.7 V to 5.25 V –40°C to +105°C temperature range Independent interface power supply 24-lead TSSOP 3-wire serial interface SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK Gas analysis Industrial process control Instrumentation Blood analysis Smart transmitters Liquid/gas chromatography 6-digit DVM GENERAL DESCRIPTION The AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications. They contain a low noise, 24-/16-bit ∑-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage gen...