our customers has been asking about min. reference input level over various input type at ADF4153.
so recently, this problem is definded two case as below.
also, we got a conversion equation when Vpp is converted by dBm at sinewave .
To conclude, minimum ref input range of square wave is decreased than sine wave as below.
1) where) 51ohm shunt resistor must use at reference input.
1) Sine wave(need input level over -4dBm)
10log(0.4)^2/(0.008*50) = -3.98dBm
2) Square wave(need input level over -1dBm)
10log(0.4)^2/(0.004*50) = -0.97dBm
2) when the CLK is high impedance and waveform is TTL, CMOS or sinewave form. the below spec will be used.
I want to discuss upper condition is right or not? could you please tell me if you have another idea?
I wish to help when you design PLLIC.