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Clock for TAS5613

Chaitanya Krishna

Prodigy 60 points

Other Parts Discussed in Thread: TAS3103, TAS3204, TAS5613

Hello

I am an embedded systems and power electronics engineer.

I am also and avid AV enthusiast and hobbyist

But hands on experience in audio is limited to only about five projects

I wanted to get my hands dirty with class D amps from TI.

I recently ordered a variety of Purepath Dsps and class d amplifiers for playing around

I first wanted to build a TAS5613 based amplifier and then go on to playing around with TAS3204 and TAS3103

I am in the process of designing the TAS5613 amp however there were some parts unclear to me in the datasheet

For the oscillator section which says OSC_IO+ and -

1. am i right in assuming that the pins need to be connected to a regular crystal with load caps?

2. If yes , then what is the crystal frequency?

3. If no , then how do i provide a clock input to the TAS5613

over 13 years ago

0 SteveCrump over 13 years ago

TI__Mastermind 18510 points

Chairanya, it is not necessary to add a crystal or external clock, only a resistor at the FREQ_ADJ pin. It is also possible to use an external clock.

This is explained on page 21 of data sheet SLAS711, under OSCILLATOR. TAS5613 includes a master clock oscillator, and its frequency can be trimmed with a resistor at the FREQ_ADJ pin. The trim resistances and switching frequencies are shown on page 4 under RECOMMENDED OPERATING CONDITIONS. The master clock rate is 10 times the switching frequency, as noted on page 10 under ELECTRICAL CHARACTERISTICS, OSCILLATOR. To use an external clock, connect the FREQ_ADJ pin to VREG and drive OSC_IO+/- differentially with the external clock.

Best regards,

Steve.

0 Chaitanya Krishna over 13 years ago in reply to SteveCrump

Prodigy 60 points

Thank you very much steve..

That clears up the issue.

You have been very helpful

Audio

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Clock for TAS5613