AD7747ARUZ-REEL7

AD7747 is a high-resolution, Σ-Δ capacitance-to-digital converter (CDC) with temperature sensor. The capacitance to be measured is connected directly to the device inputs. The AD7747 capacitance input range is ±8pF (changing) and it can accept up to 17pF common-mode capacitance (not changing), which can be balanced by a programmable on-chip digital-to-capacitance converter (CAPDAC). The AD7747 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. The part has a standard voltage input that, together with the differential reference input, allows easy interface to an external temperature sensor, such as an RTD, thermistor, or diode.

• 2.7V to 5.25V single-supply operation and 0.7mA current consumption
• New standard in single chip solutions
• Interfaces to single or differential grounded sensors
• Resolution down to 20aF (that is, up to 19.5bit ENOB), accuracy: 10fF and linearity: ±00.01%
• Common-mode (not changing) capacitance up to 17pF and full-scale (changing) capacitance range ±8pF
• Simultaneous 50Hz, 60Hz rejection at 8.1Hz update and active shield for shielding sensor connection
• Update rate: 5Hz to 45Hz
• Voltage input channel and internal clock oscillator
• 2-wire serial interface (I2C® compatible) power
• 16-lead TSSOP package, operating temperature range -40°C to +125°C

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