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Shown here with transformer installed. The transformer is 8 trifilar wound on T37-43 core. When T1 is installed, R2, R3, C9 are not installed. This board can be programmed using the DSC Rev. 0 (as many as three DDS_Rev_3 boards can be controlled) and you may find that the following software is helpful. With the transformer installed approximately 6dB gain is realized, the measured output is approximately 6.4dBm (before the filter), by adjusting resistor R4 the output maybe adjusted to +7dBm. The transformer will limit the low frequency performance of the DDS. This demonstration shows the AD9851 chip with a 64MHz oscillator installed. The board is operational to 180MHz when used with 30MHz oscillator and X6 PLL mode. Output filter components chosen according to application. |
