• RE: HMC987 Default States on Power-Up


    Register defaults given in the datasheet are power on reset values. So, all the channels are enabled and ready to use without any register configuration. If individual channels are wanted to be disabled or gain of RF buffer is needed to be changed…

  • HMC987


    Page 3 of the HMC987LP5E data sheet specifies the integrated noise for the fan out buffers, but I don't see anything for the RF output. Do you have spec numbers for the RF output buffer? Thanks.

    Best Regards.

  • HMC6832 & HMC987

    On the HMC6832, 

    1. are there any phase noise plots on the part, the data sheet does not show any information on close in noise at higher frequency’s, my operating range would be from ~500 to 3200MHz
    2. The data sheet in figure 12 shows relative output…
  • HMC987 Parallel Port Control transition to SPI Control

    Can the HMC987 use the SPI interface after powering-up in Parallel Port Control mode? Or can the PMODE_SEL bit not be changed once enabled and latched?

    I am looking to determine if we can initialize the device as if it were in Parallel Port Control (channels…

  • HMC987 EVM


    I'm interested in trace lengths from each IC output to RF connector.  Alternately, please provide EVM source documents, and I can just measure them.  Thanks!

    Kind regards,


  • HMC987 Power Design


    I am designing HMC987 circuit.

    HMC987 has VCCHF, VCCRF, VCCA and VCCB.

    Please tell me each power use.

    For example,

    VCCRF drives RFOUTP and RFOUTN.

    VCCHF drives CLKP , CLKN and SPI Signals.

    VCCA drives CLKP1-4 and CLKN1-4.

    VCCB drives CLKP5…

  • HMC987 minimum jitter output


    I am trying to minimize the clock jitter added by the HMC987 fan-out chip and have a liberty to chose outputs (not all 8 are used in the design). A quick measurements of the time domain (not bandwidth limited) jitter using the evaluation boards show…

  • HMC987 Output Power

    Hi ADI,

    The HMC987 datasheet shows 1.1 / 1.2 / 1.3 Vppd for min / typ / max at 4 GHz into 100 ohm (p.3).

    Figure 9. Fundamental Output Power vs. Frequency & Temperature shows performance a few dB less than that.  For example, at 4 GHz  (room), the output…

  • HMC987 space qualified data sheet


    Is there a space qualified data sheet available for the HMC987?  I've only been able to find a normal data sheet.



  • RE: HMC833 to HMC987 interface

    The interface should look like...

    The max input reference for the HMC833 is 350 MHz.  50 MHz will work fine.

    The HMC987 provides 8 LVPECL outputs and a single CML output.   If the LVDS receiver can handle the 800mVpp HMC987 output levels you can connect…