AD7747
PRODUCTION24-Bit Capacitance-to-Digital Converter with Temperature Sensor
- Part Models
- 3
- 1ku List Price
- Starting From $6.42
Part Details
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The AD7747 is a high-resolution, Σ-Δ capacitance-to-digital converter (CDC). The capacitance to be measured is connected directly to the device inputs. The architecture features inherent high resolution (24-bit no missing codes, up to 19.5-bit effective resolution), high linearity (±0.01%), and high accuracy (±10 fF factory calibrated). The AD7747 capacitance input range is ±8 pF (changing), and 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 AD7747 is designed for single-ended or differential capacitive sensors with one plate connected to ground. For floating (not grounded) capacitive sensors, the AD7745 or AD7746 are recommended.
The part has 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 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.
The AD7747 has a 2-wire, I2C-compatible serial interface. The part can operate with a single power supply of 2.7 V to 5.25 V. It is specified over the automotive temperature range of −40°C to +125°C and is housed in a 16-lead TSSOP package.
Applications
Automotive, industrial, and medical systems for:
- Pressure measurement
- Position sensing
- Proximity sensing
- Level sensing
- Flowmeters
- Impurity detections
Documentation
Data Sheet 1
Application Note 1
Technical Articles 1
Product Highlight 1
Evaluation Design File 1
Frequently Asked Question 1
Product Highlight 1
Device Drivers 2
Analog Dialogue 2
Webcast 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7747ARUZ | 16-Lead TSSOP | ||
| AD7747ARUZ-REEL | 16-Lead TSSOP | ||
| AD7747ARUZ-REEL7 | 16-Lead TSSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 20, 2012 - 11_0218 Halogen Free Material Change for Certain TSSOP Products at Carsem |
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| AD7747ARUZ | PRODUCTION | |
| AD7747ARUZ-REEL | PRODUCTION | |
| AD7747ARUZ-REEL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
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AD7747 Evaluation Kit
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