Introduction
The AD7715 is a complete analog front end for low-frequency applications providing a fully-differential input channel. The device accepts low-level signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta technique to realize up to 16-bits of no missing codes performance. Full data on the AD7715-5 is available in the AD7715 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.
Included on the evaluation board, along with the AD7715-5, are an AD780, a +2.5 V ultra-high precision bandgap reference, a 2.4576 MHz crystal and digital buffers to buffer signals to and from the edge connectors. Interfacing to this board is provided either through a 36-Way Centronics connector or through a 9-way D-type connector. External sockets are provided for the analog inputs, an external reference input option and an external master clock option.
Features
- Operates from a Single +5 V Supply
- On-Board Reference and Digital Buffers
- Various Linking Options
- Direct Hook-Up to Printer Port of PC
- PC Software for Control and Data Analysis
Documentation
Technical notes are available in Adobe Acrobat Portable Document Format (PDF).
To download the Technical Note, select the link below:
Software
To use the software you will require an IBM compatible and Windows 3.1 must be installed. The software will allow the user the control all the functionality of the AD7715 via the printer port of the PC. The window called PROGRAM AD7715 will allow the user at a glance to see how the AD7715 is programmed. The device program may be read back at any time.
To program the AD7715 simply "click" on the options you wish to set-up and then "click" on the "Program AD7715" button at the bottom of the window. If you try to return to the MAIN MENU without calibrating the AD7715 after the program has been changed, you are given to option to do so. The software also allows the user to save the data gathered by the program.
To download the software, select the link below:
