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Old 3rd August 2003, 10:52 PM   #1
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Default Toslink input for CS8412?

What is the best way to add a Toslink input to a CS8412 receiver? Simply connect the output of the TORX to RXN and RXP? Or do I still have to use the resistor/caps/transformer recommended in the Crystal data sheet?

Thanks in advance

Jan
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Old 4th August 2003, 09:45 PM   #2
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Default Re: Toslink input for CS8412?

Quote:
Originally posted by knucklehead23
What is the best way to add a Toslink input to a CS8412 receiver? Simply connect the output of the TORX to RXN and RXP? Or do I still have to use the resistor/caps/transformer recommended in the Crystal data sheet?

Thanks in advance

Jan
Jan

I'd suggest to go straight into the 8412. Does the TORX have a balanced output ?

I prefer to use balanced drive for the Crystal

regards
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Old 4th August 2003, 09:57 PM   #3
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Hello Guido

Thanks for your reply. The TORX doesn't have a balanced output, just tree pins: Signal, GND and +5V. I'll just try a direct connection.

Regards

Jan
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Old 5th August 2003, 01:05 AM   #4
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Default No, and no......

Avoid TOSLINK at all costs. Find a way to add a coax digital out. Unless you don't care how it sounds.

Do not go into the RX chip directly.....use a balanced active circuit that does not use saturated logic of any kind.

Jocko
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Old 5th August 2003, 01:26 AM   #5
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Hi,

Shogun-san,

Quote:
Do not go into the RX chip directly.....use a balanced active circuit that does not use saturated logic of any kind.
High time for you to show the horses' front...

Mayonara,
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Old 5th August 2003, 06:38 PM   #6
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Quote:
Originally posted by fdegrove
Hi,

Shogun-san,



High time for you to show the horses' front...

Mayonara,

Hi

I'd suggest to add a balanced output transormer after the Toslink receiver, add small series stopper resistors (100 ohm) from secundaries towards the 8412.

And decouple the receiver using series ferrite beads towards the seperate power supply

Jocko ?

regards
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Old 6th August 2003, 08:33 AM   #7
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Default Re: Toslink input for CS8412?

Quote:
Originally posted by knucklehead23
What is the best way to add a Toslink input to a CS8412 receiver? Simply connect the output of the TORX to RXN and RXP? Or do I still have to use the resistor/caps/transformer recommended in the Crystal data sheet?
Different views here, but why don't you start to connect as the datasheet? You can also check how I have done.

We have all different ears. Maybe this is sufficient for you?
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Old 6th August 2003, 07:07 PM   #8
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Toslink may very well work fine, as peranders says why don't you just connect it as the data sheet suggests?

It will work without the cap to ground and the cap to rxp i.e. direct connection to the receiver from rxp and directly to ground at rxn (I'd connect rxn to the ground pin at the toslink reciever).
You might want to add a small resistor 22 to 100 ohms in order to dampen potential overshot.

I've found that toslink receivers and transmitters are very sensitive to its power supply, make sure its lownoise and stable up to and above its range, ideally individually supplied.

Guido usually have very sound reasons for his suggestions but adding a transformer when using toslink escapes me.....? Guido?
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Old 7th August 2003, 07:52 PM   #9
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Quote:
Guido usually have very sound reasons for his suggestions but adding a transformer when using toslink escapes me.....? Guido?
Use RCA-SPDIF and a transformer or the balanced active circuit like Jocko advises, you won't regret it. This subject has been discussed several times. Please use the Search function on digital transformer.

Toshlink ( the correct name ) gives not as good results as RCA-SPDIF will give.
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Old 7th August 2003, 08:21 PM   #10
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Question Re: No, and no......

Quote:
Originally posted by Jocko Homo
.

Do not go into the RX chip directly.....use a balanced active circuit that does not use saturated logic of any kind.

Jocko
Hi Jocko,
You don't like Fred's circuit with the 74HCU04 and 74HC86??

What exactly do you advice?
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