Product Description

DESCRIPTION:

• 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
• Technical sheet: https://pdf1.alldatasheet.fr/datasheet-pdf/view/48288/AD/AD7730.html

• Resolution of 230,000 Counts (Peak-to-Peak)
• Offset Drift: 5 nV/8C
• Gain Drift: 2 ppm/8C
• Line Frequency Rejection: >150 dB
• Buffered Differential Inputs
• Programmable Filter Cutoffs
• Specified for Drift Over Time
• Operates with Reference Voltages of 1 V to 5 V

• Weigh Scales
• Pressure Measurement