Other Parts Discussed in Thread: LMX2485
To Whom it May Concern,
I am using the RF PLL only and operating at an RF frequency of 1.6GHz and a reference frequency of 19.2MHz. The device is setup in 22 bit fractional mode. The measured current with a 3V supply is 8mA. I expected it to be closer to 3.3mA based on the data sheet. I turned off the charge pump in order to match the data sheet, but the current still remained around 8mA. The IF pll current measured near 0 since it is powered down. Is this current what you would expect? I used the same PLL circuit with a different vco and an RF output frequency of approximately 300 MHz and the current was 3.5mA. Any suggestions for lowering the output current? I did disable the optional test outputs and clock output.
Thanks,
Shawn