AD7792

www.DataSheet4U.com Preliminary Technical Data FEATURES Resolution: Low Power, 16/24-Bit Sigma-Delta ADC with Low-Noise In-Amp and Embedded Reference AD7792/AD7793 GND VBIAS VDD BANDGAP REFERENCE AVDD REFIN(+)/AIN3(+) REFIN(-)/AIN3(-) GND SIGMA DELTA ADC SERIAL INTERFACE AND CONTROL LOGIC DOUT/RDY DIN SCLK CS AIN1(+) AIN1(-) AIN2(+) AIN2(-) VDD IOUT1 IOUT2 GND INTERNAL CLOCK MUX IN-AMP AD7792: 16-Bit AD7793: 24-Bit Low Noise Programmable Gain Instrumentation-Amp RMS noise: 80 nV (Gain = 64) Bandgap Reference with 5ppm/ C Drift typ Power Supply: 2.7 V to 5.25 V operation Normal: 400 µA typ Power-down: 1 µA max Update Rate: 4 Hz to 500 Hz Simultaneous 50 Hz/60 Hz Rejection Internal Clock Oscillator Programmable Current Sources (10 µA/200 µA/1 mA) On-Chip Bias Voltage Generator 100 nA Burnout Currents Independent Interface Power Supply 16-Lead TSSOP Package DVDD AD7792/AD7793 CLK Figure 1. GENERAL DESCRIPTION The AD7792/AD7793 is a low power, complete analog front end for low frequency measurement applications. The AD7792/AD7793 contains a low noise 16/24-bit ∑-∆ ADC with three differential analog inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 80 nV when the update rate equals 16.6 Hz. The device contains a precision low noise, low drift internal bandgap reference for absolute measurements. An external reference can also be used if ratiometric ...