MCLK (22/24MHz) signal transfering. Distance 25cm. - diyAudio
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Old 21st April 2004, 08:43 AM   #1
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Default MCLK (22/24MHz) signal transfering. Distance 25cm.

In Pioneer DV-444 (DVD player) clock supplied from PLL (see picture).
PLL MCLK signal to DAC (PCM1742EK BB) is connected with 16 cm length wire (PCB trace).
Signal in scope (MCLK near PCM1742) looks bad.
Also I want to connect CS4392 (DAC) in parallel. Distance from PLL to CS4392 DAC is about 25cm.

How to transfer MCLK (22MHz) signal to second DAC with minimal additional jitter and minimal distortion?
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Old 21st April 2004, 06:12 PM   #2
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Lightbulb Coax

Hi, 50 Ohm or 75 Ohm coax properly terminated at the receiving end. Horowitz second edition page 611 & 879.
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Old 21st April 2004, 06:19 PM   #3
jwb is offline jwb  United States
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Agree with Elso, try MMCX or Hirose u.FL micro connectors and the proper size of coax, and make certain to match termination.
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Old 21st April 2004, 07:37 PM   #4
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Why only properly terminated, and not also properly started?
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Old 22nd April 2004, 07:06 AM   #5
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Lightbulb Double terminated

Quote:
Originally posted by Bricolo
Why only properly terminated, and not also properly started?
Bricolo,
If you mean double terminated and you are satisfied with halved signal levels.......

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Old 22nd April 2004, 07:55 AM   #6
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Default Connection schematic

Hi,

Thanks for replayes.

When 50 or 75 Ohm terminator is connected to ground at receiver side, it take current.
PLL supply is 3,3V. If logical 1 is 2,5 volt, then current in 50 Ohm terminator will be 50mA.

This amount of current is acceptable for CMOS PLL ?
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Old 22nd April 2004, 08:04 AM   #7
Bricolo is offline Bricolo  France
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Default Re: Double terminated

Quote:
Originally posted by Elso Kwak


Bricolo,
If you mean double terminated and you are satisfied with halved signal levels.......


I know

But that's what I learnt at school. Transmission lines have to be double terminated in order to work properly (no reflection on both sides)
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Old 22nd April 2004, 08:09 AM   #8
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If you only intend for the signal to go in one direction, it's perfectly OK to drive from a low impedance and terminate in the characteristic impedance of the cable. This will prevent any reflection.

On dc biased signals, you might find a C-R termination better, or a termination biased to Vcc/2.
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Old 22nd April 2004, 10:30 AM   #9
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Post Re: Re: Double terminated

Quote:
Originally posted by Bricolo

I know
But that's what I learnt at school. Transmission lines have to be double terminated in order to work properly (no reflection on both sides)
Now what are you going to do about it?
Lay it on the line!
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