Product Details
Product Description
Product Description
explain
The AD7745/AD7746 is a high resolution, Σ-Δ Capacitive to Digital Converter (CDC). The capacitance to be measured is directly connected to the device input. The architecture has inherent high resolution (24 bit no missing code, up to 21 bit effective resolution), high linearity (± 0.01%), and high precision (± 4 fF factory calibration). The capacitance input range of the AD7745/AD7746 is ± 4pF (change), while it can accept up to 17 pF of common mode capacitance (unchanged), which can be balanced by a programmable on-chip digital capacitance converter (CAPDAC).
The AD7745 has one capacitive input channel and the AD7746 has two channels. Each channel can be configured as a single terminal or a differential. The AD7745/AD7746 is designed for floating capacitive sensors. For capacitive sensors that connect a board to ground, the AD7747 is recommended.
The component has an on-chip temperature sensor with a resolution of 0.1 ° C and an accuracy of ± 2 ° C. The on-chip voltage reference and on-chip clock generator eliminate the need for any external components in capacitive sensor applications. These components have a standard voltage input that, together with the differential reference input, allows easy connection to external temperature sensors such as RTDs, thermistors, or diodes.
The AD7745/AD7746 has a 2-wire, i2c compatible serial interface. Both components can operate on a single power supply from 2.7 V to 5.25 V. They can be specified within the vehicle temperature range of - 40 ° C to+125 ° C and installed in a 16 lead TSSOP package.
FEATURES
Capacitance-to-digital converter
New standard in single chip solutions
Interfaces to single or differential floating sensors
Resolution down to 4 aF (that is, up to 21 ENOB)
Accuracy: 4 fF
Linearity: 0.01%
Common-mode (not changing) capacitance up to 17 pF
Full-scale (changing) capacitance range: ±4 pF
Tolerant of parasitic capacitance to ground up to 60 pF
Update rate: 10 Hz to 90 Hz
Simultaneous 50 Hz and 60 Hz rejection at 16 Hz
Temperature sensor on-chip
Resolution: 0.1°C, accuracy: ±2°C
Voltage input channel
Internal clock oscillator
2-wire serial interface (I2C®-compatible)
Power
2.7 V to 5.25 V single-supply operation
0.7 mA current consumption
Operating temperature: –40°C to +125°C
16-lead TSSOP package
APPLICATIONS
Automotive, industrial, and medical systems for
Pressure measurement
Position sensing
Level sensing
Flowmeters
Humidity sensing
Impurity detection
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