Analog Devices Hittite HMC1023LP5E User Manual page 12

HMC1023LP5E Evaluation Kit User Manual
• Enabling I and/or Q channel and setting the HMC1023LP5E to 10dB gain mode are
accomplished by checking the appropriate box directly.
• Setting the filter bandwidth without running a calibration is accomplished by choosing
one of the selected bandwidths in the pull down menu and pressing the "Set Bandwidth"
button. Note that the uncalibrated filter bandwidth is only within +20% of the chosen
bandwidth.
• Setting an arbitrary filter bandwidth is accomplished by first running a calibration
with a user supplied clock (connected to J5 SMA connector on the HMC1023LP5E
evaluation board) and then calculating the bandwidth codes and programming the
HMC1023LP5E.
• Enter the frequency of the clock source in MHz (40MHz is recommended, please see
the datasheet for other frequencies).
• Connect and enable the clock source
• Press the "Calibrate Filter" button. Note the Cal result and the Cal count outputs.
• Enter the desired arbitrary filter bandwidth and press the "Calculate Filter Bandwidth
Codes" button. This routine uses the previous calibration result and calculates the
required settings. These settings are applied via the "Write BW Settings" button.
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Rev. A - v00.1212