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EAGLE Library Object
|Uploaded by:||Juergen Messerer|
|Remarks:||This library is a part of the archive file m-pad-2.1.zip|
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|Download options:||Download whole archive|
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|Description:||Analog Devices AD7746 24-Bit Capacitance-to-Digital Converter with Temperature Sensor|
The AD7745/AD7746 are a high resolution, Sigma-Delta capacitance-to-digital converter (CDC).
The capacitance to be measured is connected directly to the device inputs.
The architecture fea-tures inherent high resolution (24-bit no missing codes, up to 21-bit effective resolution), high linearity (±0.01%), and high accuracy (±4 fF factory calibrated).
The AD7745/AD7746 capacitance input range is ±4 pF (changing), while it can accept up to 17 pF common-mode capacitance (not changing),
which can be balanced by a programmable on-chip, digital-to-capacitance converter (CAPDAC).
The AD7745 has one capacitance input channel, while the AD7746 has two channels. Each channel can be configured as single-ended or differential.
The AD7745/AD7746 are designed for floating capacitive sensors. For capacitive sensors with one plate connected to ground, the AD7747 is recommended.
The parts have an on-chip temperature sensor with a resolution of 0.1°C and accuracy of ±2°C.
The on-chip voltage reference and the on-chip clock generator eliminate the need for any external components in capacitive sensor applications.
The parts have a standard voltage input, which together with the differential reference input allows easy interface to an external temperature sensor, such as an RTD, thermistor, or diode.
The AD7745/AD7746 have a 2-wire, I2C-compatible serial interface. Both parts can operate with a single power supply from 2.7 V to 5.25 V.
They are specified over the automotive temperature range of -40°C to +125°C and are housed 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
- Humidity sensing
- Impurity detection
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