ANALOG DEVICES EVAL-AD73360(L)EB Service Manual

EVAL-AD73360LEB
=		AD73360(L)EvaluationBoard,
		Six Input Channel Analog Front End
		EVAL-AD73360(L)EB

FEATURES

Full-Featured Evaluation Board for the

AD73360 & AD73360L

Stand Alone Operation

On-Board DSP

High-Speed Parallel Interface to the PC

PC Software for Control and Data Analysis.

INTRODUCTION

This Technical Note describes the evaluation board for the both AD73360 and the AD73360L six input-channel simultaneous sampling sigma-delta A/D converters. The AD73360L is a 3V only version of the AD73360. Full data on the both parts is available in the relevant data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.

The evaluation board allows a user to exercise all the functions of the AD73360(L). The analog inputs are buffered by op-amps which may be configured for acor dccoupling operation. The evaluation board contains an ADSP2185L digital signal processor which can be programmed to control and read data from the AD73360(L). The evaluation board comes with software which can be run on the users PC allowing programs to be downloaded and data to be uploaded from the evaluation board. Several example programs are provided which demoonstrate the capabilities of the AD73360(L).

SETTING UP THE EVALUATION BOARD FOR THE FIRST TIME

The AD73360(L) evaluation board kit comes with the evaluation board for the required part, AD73360 or AD73360L and software which allows the user to program the AD73360(L) and read back samples using a PC. The software is provide on a CD ROM and this also contains a data sheet, this technical note and some DSP example code. The user needs to supply a Centronics printer port cable and a 6V to 12V DC power supply.

Installing the Software

When the CD ROM is inserted into the PCs drive the install routine automatically starts. This allows the user to select which components to install i.e. data sheet, technical note, application software etc. When using the software to control the evaluation board it is important the following steps are completed in order.

1.The evaluation board should be powered up with the printer port cable disconnected.

2.The software should be loaded.

3.The printer port cable can then be connected and the PC should be able to communicate with the evaluation board.

FUNCTIONAL BLOCK DIAGRAM

An a lo g In p uts

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AD 7 3 3 6 0 (L )

Control Logic

PrinterPort Connector

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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: [phone] Fax: [phone]

EVAL-AD73360(L)EB

System Requirements

Pentium 90 IBM Compatible PC

Windows 95

4Mbytes Hard Disk Space

Bidirectional Printer Port (PS/2, EPP, ECP)

OPERATING THE AD73360(L) EVALUATION BOARD

Power Supply

The AD73360(L) evaluation board can be powered from any +9 V to +12 V DC power supply connected to J10 on the board. This supply is regulated to +5 V to power the PC interface section of the board and also regulated to +3.2 V to power the DSP and AD73360(L) sections. The analog section of the AD73360 can also be powered from +5 V if required. This should only be done when the AD73360 is used in the evaluation board.

When power is applied the POWER LED D4 should be lit indicating that the power connector is correctly polarized. Also the LED connected to FL2 should begin to flash on and off indicating that the DSP has booted from the on-board flash EPROM correctly.

When the evaluation board has been powered up the PC software can be loaded and the printer port connector can be connected. the PC should now be able to communicate with the evaluation board.

Link Settings

The AD73360(L) evaluation board has a number of link options which can be used to select the various operating conditions of the evaluation board. The linking options are described in detail below.

Table I. Interface Mode Selection

Link	Position	Function
LK1	A1	Frame-Sync Loop
		Back
	B	Non Frame-Sync
		Loop Back
1 Default Link Position
	Table II. Crystal Frequency Selection
LK2	LK3	LK4		Fout
IN	IN	IN		Fo/21 2
IN	IN	O U T		Fo/4
IN	O U T	IN		Fo/8
IN	O U T	O U T		Fo/16
O U T	IN	IN		Fo/32
O U T	IN	O U T		Fo/64
O U T	O U T	IN		Fo/128
O U T	O U T	O U T		Fo/256

1Fo=16.384MHz

2Default Link Positions

Table III. Master Clock Selection

Link		Position		MCLK Frequency
LK5		A1		16.384MHz
		B		Fout
1. Default Link Position
		Tabel IV. Reference Selection
Link		Position		Function
LK6		IN1		External	Reference
		O U T		Internal	Reference
1. Default Link Position
	Tabel V. Voltage Selection for AD73360(L)
Link		Position		Function
LK7		A		+5V Analog Section
		B1		+3V Analog Section

1. Default Link PositionEvaluation Board Software

EVALUATION BOARD SOFTWARE

The evaluation board comes with software which will allow the user to operate the various functions of the AD73360(L). There are two main sections to the complete software package. One runs on the PC and handles all the communications between the PC and the evaluation board. The PC software can be used to load a DSP based program to the evaluation board which is specifically written to operate the AD73360 in a required manner. The second section of the software is the DSP programs. These are loaded to the ADSP2185L on the evaluation board. The programs are designed to allow the user to gather data from the AD73360 and upload it from to the PC to be saved or analysised. The DSP example programs can be modified and recompiled to meet the needs of the users end application if necessary.

PC Software Description

When the user runs the software they are presented with a selection screen where the user can determine if they want to use the Basic or Demonstration Mode options. The Selection Screen is shown in Figure 1.

Figure 1. Selection Screen

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EVAL-AD7360(L)EB

Figure 2. The Basic Mode Screen

When running the software for the very first time it is advisable to select the Basic screen as this will allow the user to verify that the PC is communicating with the evaluation board and vice versa. The Basic Screen is shown in Figure 2. The user should click on the Get Software Version button to establish if the communications are working. If they are the user should see a message box similar to that of Figure 3.

Figure 3. Software Version Message Box

The additional functions available in this screen will be described later in this document.

DEMONSTRATIONS SCREEN

The Demonstrations Screen will allow the user to select one of a number of demonstration programs which will program the AD73360(L) and read data from one or more selected channels. Figure 4 shows the Demonstrantions Screen.

Menu Item Descriptions

File Menu:

Save Data: The user can save the ADC samples taken by the AD73360(L). The samples are saved to a text file which can be opened by programs such as Notepad, Excel or Mathcad for further examination/analysis.

Save FFT Data: The user can save the results of the FFTs performed on the ADC data. The data is saved to a text file which can be opened by programs such as Notepad, Excel or Mathcad for further examination/analysis.

Load Data: The user can reload previously saved data into the program . The program will display the ADC samples and recalculate the FFT for each channel.

Options Menu:

Run On Download: Selecting this option will automatically run any program which is downloaded to the DSP. If this option is deselected the Run button must be pressed in order to start the DSP program.

AD73x60 Options: This option allows the user to select the Sample Rate used by the DSP program, the number of ADC samples to be taken by each channel and the Frequency Band of Interest over which to calculate the SNR for each channel.

AD73x60 Options: Selecting this option causes the evaluation board to be reset.

Printer Port: This option allows the user to select which printer port the software should use to communicate with the evaluation board. By default LPT1 is chosen.

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