TDA8566Q / TDA1562Q questions

[RicY]

Hello,

I have got some BMW Hifi DSP amps lyinig around for some time. They have got no optical converter parts or heatsinks, only the amp section, so they are just for parts. There are some tda8566q and tda1562q chips in there, that got my mind going for making a simple 12VDC powered amp, but reading the pinouts i got to a problem.

Theese chips have diagnostic/mode switching outputs. Does it mean that the chips cant be powered without a microprocessor thingy? And other thing is the tda1562q has IN+, IN-, Sgnd pins. What for is the Sgnd pin?

Sorry for grammatical mistakes.

 

[Mooly]

Sgnd is signal ground. These are straightforward "analogue" chips. No uP required.

 

[RicY]

So it means that IN+ , IN-, Sgnd is menant for balanced signal input?

 

[Mooly]

Not exactly

In + and In - are the non inverting and inverting inputs just like an opamp. Signal ground means a clean ground uncontaminated by any PSU noise.

 

[RicY]

Ok. Kinda got it. Drew a schematic based on my understanding and some internet digging.

 

[abraxalito]

I have a schematic for a TDA8566 amp on my blog - best sounding chipamp I've ever come across when the PSU is low enough impedance The chip is opamp-like but actually its an AFA - 'Active Feedback Amp' of the kind devised by Barrie Gilbert I believe.