AD7747ARUZ-REEL

AD7747 is a high-resolution, Σ-Δ capacitance-to-digital converter (CDC). The capacitance to be measured is connected directly to the device inputs. The architecture features inherent high resolution (24bit no missing codes, upto 19.5bit effective resolution), high linearity (±0.01%), and high accuracy (±10fF factory calibrated). This device capacitance input range is ±8pF (changing), and it can accept upto 17pF common-mode capacitance (not changing), which can be balanced by a programmable on-chip digital-to-capacitance converter (CAPDAC). It is designed for single-ended or differential capacitive sensors with one plate connected to ground. The on-chip voltage reference and the on-chip clock generator eliminate the need for any external components in capacitive sensor applications. It is used in applications such as automotive, industrial, and medical systems for pressure measurement, position sensing, proximity sensing, level sensing, flow metering, impurity detection.

• New standard in single chip solutions, interfaces to single or differential grounded sensors
• Simultaneous 50Hz and 60Hz rejection at 8.1Hz update
• Active shield for shielding sensor connection
• Voltage input channel, internal clock oscillator
• 2-wire serial interface (I²C® compatible), single-supply operation range from 2.7V to 5.25V
• Integral nonlinearity is ±0.01% of FSR maximum at (VDD = 2.7V to 3.6V)
• Output noise, rms is 11.0aF/√Hz typical at (VDD = 2.7V to 3.6V)
• Gain drift vs. temperature is -26ppm of FS/°C typical at (VDD = 2.7V to 3.6V)
• Supply current is 850μA maximum at (VDD = 2.7V to 3.6V)
• Operating temperature is -40°C to +125°C, package style is 16-lead TSSOP

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