"The HMC705LP4(E) is a low noise GaAs HBT programmable divider in a 4x4 mm leadless surface mount package. The divider can be programmed to divide by any number from N = 1 to N = 17 up to 6.5 GHz. The HMC705LP4E’s high frequency operation along with low phase noise floor is very useful in high performance fast settling synthesizer architectures." Says the datasheet. (Analog Devices)

As we used FR4, it is to be assumed, that the performance degrades above 3 GHz.

No protection circuit is foreseen. Think twice before using it - and RTFM !

And yes, as with a lot of High Frequency Gadgets - this one is very Power-hungry. At 5 Volts, 200 mA are consumed !

The Prescaler value is set by jumpers. No Jumper results in a HIGH voltage. A Jumper set results in a low voltage. Use this table for it :

N	S0	N0	N1	N2	DIV1	BYP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

The Waveform of the output as well as the Amplitude depends on the Division Ratio.

If that causes problems in your application, add a Divide by 2 at the output. This will then produce a 50% Duty Cycle for all Settings of N. Bandwidth of the used Scope is 100 MHz.

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