diyAudio - TXCO pins connection

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Mikewong

19th January 2009 11:49 AM

TXCO pins connection

2 Attachment(s)

Attached is picture of TXCO16.9344 2ppm, with 4 soldering pins:
pin1:Vcc—voltage supply

pin3:Out—frequency out

pin4:GND

pin6:VC

The VC means Voltage compensation or Voltage control !？
How am I going to connect pin6 in a reclock schematic?

Hercules

21st January 2009 11:04 AM

Usually only Vcc, GND and CLK out will be use, the remaining pin will be NC )not connected.

Mikewong

21st January 2009 11:16 AM

Thank you.

gmarsh

21st January 2009 11:47 AM

Vc is frequency control. What you have there is a "VCTCXO", a frequency compensated VCXO.

I'd connect a 10K pot (a little Bourns 3339 or something) with the ends connected to Vcc and ground, the wiper connected to Vc, and Vc in turn connected to ground with a 0.01-0.1uF cap.

Mikewong

21st January 2009 12:34 PM

Quote:

Originally posted by gmarsh
Vc is frequency control. What you have there is a "VCTCXO", a frequency compensated VCXO.

I'd connect a 10K pot (a little Bourns 3339 or something) with the ends connected to Vcc and ground, the wiper connected to Vc, and Vc in turn connected to ground with a 0.01-0.1uF cap.

gmarsh ,
I got the picture yet how am I going to fine adjust the connected VR?

Guido Tent

21st January 2009 07:59 PM

Quote:

Originally posted by Mikewong

gmarsh ,
I got the picture yet how am I going to fine adjust the connected VR?

Adjustment not required, the pulling usually is very small, you won't hear any difference, but if you want, tune for nominal frequency.

But better get rid of TCXO's as absolute accuracy is a non-requirement for audio.

best

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