Evaluation Board User Guide
GUIDE TO PROGRAMMING THE AD9551
The AD9551 can be programmed via an SPI port or by setting the logic levels on the frequency select pins of the device. To program the device using the serial port, the evaluation board software must be installed.
For pin programming, there are two options: manually use the dip switches or use the evaluation board software to override the settings of the dip switches and change the logic levels of the frequency select pins. Using the dip switches on the evaluation board to establish the logic levels on the pins allows the AD9551 to power on with preset conditions. Alternatively, you can use the software to override the settings of the dip switches on the evaluation board and change the logic levels on the frequency select pins.
USING AN SPI PORT
After the evaluation software is installed and the evaluation board is connected to a PC and loaded with the software, the following procedure can be used to configure and lock the PLLs.
In this example, the input frequency is 622.08 MHz on REF A, and the output frequency is 622.08 MHz.
1.Ensure that Jumper JMP3 is positioned for PC control.
2.Verify that all five jumpers are in place on Connector P2.
3.Set the S1, S2, and S3 switches high. Set the S4 switch setting to high, except for RESET, which must be set to low (RESET is an active high pin).
These steps assume that the input signal is present, that the evaluation board has not been modified, and that the PLL loop filter is suitable for the application. However, this guide covers only simple PLL operation (that is, to start and run the PLL). For a detailed explanation of more advanced AD9551 features, see the AD9551 data sheet. In addition, see the Software Operation section.
USING DIP SWITCHES (MANUAL CONTROL)
The following procedure explains how the AD9551 can be pro- grammed manually by using the dip switches on the evaluation board to set the logic levels of the frequency select pins.
In this example, the input frequency is 622.08 MHz on REF A, and the output frequency is 622.08 MHz.
1.Ensure Jumper JMP3 is positioned for manual control.
2.Verify that all five jumpers are removed on Connector P2.
3.Set the S1, S2, and S3 dip switch positions to low. (Note that S2 controls REF B. If REF B is not used, there is no need to change the S2 settings.).
4.Connect a signal generator to REF A SMA Connector J1. By default, the reference inputs on this evaluation board are
5.Set the amplitude and frequency. An amplitude setting of 6 dBm is sufficient. Set the frequency to 622.08 MHz.
6.To connect a signal to REF B, connect the signal to SMA Connector J2.
7.Connect an oscilloscope, spectrum analyzer, or other lab equipment to any of the J3 to J6 SMA connectors on the upper right side of the board.
8.Power the evaluation board by plugging it into the USB port.
9.A frequency of 622.08 MHz should be observed on the OUT1 SMA connector.
If another input and/or output frequency is desired, remove the USB port. Then change the dip switch settings, and reapply the USB port connection.
After each dip switch setting, the AD9551 must be powered down by removing the USB cable to reprogram the AD9551. See the AD9551 data sheet for an explanation of pin programming.
USING SOFTWARE TO OVERRIDE DIP SWITCHES (SOFTWARE CONTROL)
The evaluation board software can be used to override the settings of the dip switches and apply a logic level to the AD9551 frequency selection pins.
After the evaluation software is installed and the evaluation board is connected to a PC and loaded with the software, the following steps can be used to configure and lock the PLLs.
In this example, the input frequency is 622.08 MHz on REF A, and the output frequency is 622.08 MHz.
1.Ensure that Jumper JMP3 is positioned for PC control.
2.Verify that all five jumpers are in place on Connector P2.
3.Set the S1, S2, and S3 dip switch positions to high.
4.Select 622.08 MHz for the input frequency in the REF A (MHz) box in the main window of the evaluation software (see Figure 4 and the Reference Input Boxes section for more information).
5.Select 622.08 MHz for the output frequency in the Output Loop Config: box in the main window of the evaluation software (see Figure 4).
6.A frequency of 622.08 MHz should be observed on the OUT SMA connector.
These steps assume that the input signal is present, that the evaluation board has not been modified, and that the PLL loop filter is suitable for the application. However, these steps are appropriate only for simple PLL operation (that is, to set up and run the PLL). See the AD9551 data sheet for more information about the various AD9551 features.
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