Analog Devices: EVAL-AD7747EBZ Evaluation Kit for AD7747 - 24-Bit Capacitance-to-Digital Converter with Temperature Sensor

atomar — Wed, 25 Jun 2014 00:52:57 GMT

Current Revision posted to Documents by atomar on 6/25/2014 12:52:57 AM

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Kit Overview

The Analog Devices EVAL-AD7747EBZEVAL-AD7747EBZ is a fully featured evaluation board for the AD7747AD7747. The evaluation board is operated with a PC via a standard USB connection with software provided enabling the user to perform detailed analysis of the CDC's performance. This software includes the technical note describing the operation and set up of the evaluation board.

The evaluation board interfaces to the USB port of a PC.
Evaluation software is available with the evaluation board, which allows the user to easily communicate with the AD7747.
Note that the AD7747 evaluation board software must be installed before connecting the AD7747 evaluation board to the PC.

The AD7747AD7747 Capacitance-To-Digital Converter (CDC):

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, 18-bit effective resolu-tion at a 16.6 Hz data rate), high linearity (±0.01%), and high accuracy (±4 fF factory calibrated).
The AD7747 capacitance input range is ±8 pF (changing), while it can accept up to 17 pF absolute capacitance (not changing), which is compensated by an on-chip digital-to-capacitance converter (CAPDAC).
The part has an on-chip temperature sensor with 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 most 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 operates from a single 3 V or 5 V power supply. It is specified over the automotive temperature range of −40°C to +125°C and is housed in a 16-lead TSSOP package.

Key Applications: AD7747 performance evaluation, Platform to integrate the AD7747 into system design.

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Technical Documents

Learning Center

Type	Description
User Guide	ADI: User Guide for EVAL-AD7747 -Evaluation Board for 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
Datasheet	ADI: Data Sheet for AD7747 - 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
Product Brief	ADI: Product Brief for AD7150 Capacitance Converter for Proximity Sensing
Product Brief	ADI: Product Brief for Boost Precision and Accuracy with Single Chip Capacitance- and Impedance-to-Digital Converters
Application Note	ADI: Application Note EMC Protection of the AD7150
Application Note	ADI: Application Note for Extending the Capacitive Input Range of the AD7745/AD7746 Capacitance-to-Digital Converter
Application Note	ADI: Application Note for Capacitance Converter for Proximity Sensing

Design Elements

Type	Description
CAD Model	ADI: CAD Model for AD7747ARUZ

Video

Kit Features

Key Features for AD7747 Evaluation BoardAD7747 Evaluation Board:

Full-featured evaluation board for the AD7747
PC evaluation software for control and measurement of the AD7747
USB interface with cable

Key Features for AD7747AD7747 24-Bit Capacitance-to-Digital Converter:

Capacitance-to-digital converter
- New standard in single chip solutions
- Interfaces to single or differential grounded sensors
- Resolution down to 20 aF (that is, up to 19.5-bit ENOB)
- Accuracy: 10 fF
- Linearity: 0.01%
- Common-mode (not changing) capacitance up to 17 pF
- Full-scale (changing) capacitance range ±8 pF
- Update rate: 5 Hz to 45 Hz
- Simultaneous 50 Hz and 60 Hz rejection at 8.1 Hz update
- Active shield for shielding sensor connection
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

Kit Contents

The Analog Devices EVAL-AD7747EBZEVAL-AD7747EBZ Evaluation Kit supplied with below contents:

Full-featured evaluation board for the AD7747AD7747
PC evaluation software for control and measurement of the AD7747
USB interface with cable

Tags: eval-ad7747ebz, ad7747, analog_devices