Analog Devices Inc. AD7746ARUZ

Description
The AD7745/AD7746 are high-resolution, Σ-Δ capacitance-to-digital converters (CDCs) designed for floating capacitive sensors. They feature:
Resolution down to 4 af (up to 21 ENOB)
Accuracy: 4 fF
Linearity: 0.01%
Common-mode capacitance tolerance up to 17 pF
Full-scale capacitance range: ±4 pF
Parasitic capacitance tolerance to ground up to 60 pF
Update rate: 10 Hz to 90 Hz
Simultaneous 50 Hz and 60 Hz rejection at 16 Hz
On-chip temperature sensor with 0.1°C resolution and ±2°C accuracy
Voltage input channel
Internal clock oscillator
2-wire serial interface (I²C-compatible)

Features
Single-chip solutions for capacitance measurement
Interfaces to single or differential floating sensors
High resolution and accuracy
Tolerant of parasitic capacitance
On-chip temperature sensor
Voltage input channel
Internal clock oscillator
2-wire serial interface
Single-supply operation (2.7 V to 5.25 V)
Low current consumption (0.7 mA)
Operating temperature range: -40°C to 125°C
16-lead TSSOP package

Applications
Automotive, industrial, and medical systems
Pressure measurement
Position sensing
Level sensing
Flowmeters
Humidity sensing
Impurity detection