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Chip Amps Amplifiers based on integrated circuits

TDA8566Q / TDA1562Q questions
TDA8566Q / TDA1562Q questions
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Old 4th May 2013, 01:26 PM   #1
RicY is offline RicY  Latvia
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Default TDA8566Q / TDA1562Q questions

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.
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Old 4th May 2013, 01:57 PM   #2
Mooly is offline Mooly  United Kingdom
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TDA8566Q / TDA1562Q questions
Sgnd is signal ground. These are straightforward "analogue" chips. No uP required.
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Old 4th May 2013, 02:30 PM   #3
RicY is offline RicY  Latvia
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So it means that IN+ , IN-, Sgnd is menant for balanced signal input?
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Old 4th May 2013, 04:20 PM   #4
Mooly is offline Mooly  United Kingdom
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TDA8566Q / TDA1562Q questions
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.
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Old 4th May 2013, 08:42 PM   #5
RicY is offline RicY  Latvia
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Ok. Kinda got it. Drew a schematic based on my understanding and some internet digging.
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Old 5th May 2013, 12:19 AM   #6
abraxalito is offline abraxalito  United Kingdom
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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.
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