HMC7044

Hi,

I have some questions about the component:

1. what should be the input configuration to get into osc-in in LVDS format?

2. In the D\S is mentioned:

For a 2.1 V commonmode, 50 Ω single-ended source, the input limit of 2.8 V allows ~700 mV of amplitude, or 6 dBm of maximum reference power.

My question is about the differential input. Does The limit of 1.4Vp-p is differential or refer to each leg (which bring us to 2.8Vp-p differential)?

3. What should I connect to the unused leg for single-ended input (A or B configuration)?  

Thanks,

Asaf



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[edited by: AS709 at 2:59 PM (GMT 0) on 27 Jun 2020]
Parents
  • +1
    •  Analog Employees 
    on Jul 2, 2020 12:16 PM 2 months ago

    Hi Asaf,

    1) For AC coupled LVDS input, you need to enable AC coupled input, disable 100 ohm internal termination and enable Hi-Z input. Also, you need to put 100 ohm termination resistance between positive and negative legs before AC coupling.

    For DC coupled LVDS input, you need to disable AC coupled input, disable 100 ohm internal termination and enable Hi-Z input. Also, you need to put 100 ohm termination resistance.

    2)Internal supply voltage is 2.8V for the buffers. The requirement is not to exceed 2.8 V at each pin for both single ended and differential.

    3)Unused leg should be directly connected to the ground with 100nF, configuration B is the correct one. 

    Regards

    Kudret

Reply
  • +1
    •  Analog Employees 
    on Jul 2, 2020 12:16 PM 2 months ago

    Hi Asaf,

    1) For AC coupled LVDS input, you need to enable AC coupled input, disable 100 ohm internal termination and enable Hi-Z input. Also, you need to put 100 ohm termination resistance between positive and negative legs before AC coupling.

    For DC coupled LVDS input, you need to disable AC coupled input, disable 100 ohm internal termination and enable Hi-Z input. Also, you need to put 100 ohm termination resistance.

    2)Internal supply voltage is 2.8V for the buffers. The requirement is not to exceed 2.8 V at each pin for both single ended and differential.

    3)Unused leg should be directly connected to the ground with 100nF, configuration B is the correct one. 

    Regards

    Kudret

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