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Doubts in datasheet of HMC794LP3E Eval Schematics

Hi,

I Want to use the HMC794LP3E : 2 GHz LOW NOISE PROGRAMMABLE DIVIDER (N = 1 to 4) for Generating 160MHz from 480MHz Input.

In the Eval Board Schematics Mentioned in Page Number 12, A 4:1 Impedance Transformer is used  in Input and Output side. Why a 4:1 Transformer is used?  whether the Input(RFIP and RFIN ) Impedance is 200 ohms?

I want to use in the single ended mode, and on Page No:12 in datasheet the Modifications to be made for single ended use in the Eval Board Schematic has been Mentioned.

In that Put the Jumper on PAD 1 and 2 on T6 Location

           Put the Jumper on PAD 5 and 6 on T6 Location

          Put the Jumper on PAD 2 and 3 on T7 Location

          Put the Jumper on PAD 4 and 6 on T7 Location

But the Transformer T6 and T7 (MABACT0065) has only 5 pins. Where can I Find mention Pad 6 of Transformer T6 and T7? Please clarify.

Parents
  • The input and output impedances of the HMC794 divider are not 50 Ohm.  No attempt was made to match the impedances to 50 Ohms on the evaluation board.

    Concerning T6 & T7, if you look at the Evaluation PCB pictorial diagram on page 9 of the datasheet you will see that, although the transformers only have 5 pins, their footprint on the PCB has 6 pins.

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  • The input and output impedances of the HMC794 divider are not 50 Ohm.  No attempt was made to match the impedances to 50 Ohms on the evaluation board.

    Concerning T6 & T7, if you look at the Evaluation PCB pictorial diagram on page 9 of the datasheet you will see that, although the transformers only have 5 pins, their footprint on the PCB has 6 pins.

Children
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