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

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.