AD7744BRQ, AD7745, AD7745AAR Selling Leads, Datasheet
MFG:AD Package Cooled:SOP-8 D/C:09+
AD7744BRQ, AD7745, AD7745AAR Datasheet download
Part Number: AD7744BRQ
MFG: AD
Package Cooled: SOP-8
D/C: 09+
AD7744BRQ, AD7745, AD7745AAR
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Info of AD7744BRQ
Info of AD7745
Info of AD7745AAR
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About AD7001
PDF/DataSheet Download
Datasheet: AD7001
File Size: 634418 KB
Manufacturer: AD [Analog Devices]
Download : Click here to Download
About AD7745
PDF/DataSheet Download
Datasheet: AD7745
File Size: 2014170 KB
Manufacturer: AD
Download : Click here to Download
About AD7001
PDF/DataSheet Download
Datasheet: AD7001
File Size: 634418 KB
Manufacturer: AD [Analog Devices]
Download : Click here to Download
AD7745 General Description
The AD7745/AD7746 are a high resolution, - 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.
AD7745 Maximum Ratings
| Parameter | Rating |
| Positive Supply Voltage VDD to GND Voltage on any Input or Output Pin to GND ESD Rating (ESD Association Human Body Model, S5.1) Operating Temperature Range Storage Temperature Range Junction Temperature TSSOP Package JA, (Thermal Impedance-to-Air) TSSOP Package JC, (Thermal Impedance-to-Case) Lead Temperature, Soldering Vapor Phase (60 sec) Infrared (15 sec) |
−0.3 V to +6.5 V 0.3 V to VDD + 0.3V 2000 V 40°C to +125°C 65°C to +150°C 150°C 128°C/W 14°C/W 215°C 220°C |
AD7745 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
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
AD7745 Typical Application
Automotive, industrial, and medical systems for
Pressure measurement
Position sensing
Level sensing
Flowmeters
Humidity sensing
Impurity detection
Pressure measurement
Position sensing
Level sensing
Flowmeters
Humidity sensing
Impurity detection
AD7745 Connection Diagram
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