Analog Devices Inc. AD7730BN

ADC Single Delta-Sigma 1.2ksps 24-bit Serial 24-Pin PDIP
ADC, DELTA-SIGMA, 19-BIT, 2-CH
24-DIP (0.300 7.62mm) THROUGH-HOLE INDUSTRIAL e0 analog front end ic 2.7V~5.25V 85C 125mW 5.33mm
IC ADC TRANSDUCER BRIDGE 24-DIP
French Electronic Distributor since 1988
The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time. The part features two buffered differential programmable gain analog inputs as well as a differential reference input. The part operates from a single 5 V supply. It accepts four unipolar analog input ranges: 0 mV to ±10 mV, 20 mV, 40 mV and 80 mV and four bipolar ranges: ±10 mV, ±20 mV, ±40 mV and ±80 mV. The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts. An on-chip 6-bit DAC allows the removal of TARE voltages. Clock signals for synchronizing ac excitation of the bridge are also provided. The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7730 contains self-calibration and system calibration options, and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C. The part is available in a 24-pin plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.