PCM1802: No clocks or data output...am I doing something wrong?

John Peck53

Part Number: PCM1802

I've wired up the PCM1802 as shown below, but I'm not seeing any output from any of the three data lines. I've tried to configure the part to be an I2S master, and to never shut down. There's no input. Shouldn't the ADC make output even without input?

over 5 years ago

0 Diego Melendez over 5 years ago

TI__Guru 57800 points

HI, John,

In order to configure the PCM1802 as Master, you need to provide a system clock to SCLK pin as the I²S clocks are generated from this clock.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 John Peck53 over 5 years ago in reply to Diego Melendez

Prodigy 90 points

Got it, thanks! Can you point me at some requirements for the clock, like frequency stability?

0 Diego Melendez over 5 years ago in reply to John Peck53

TI__Guru 57800 points

Hi, John,

There are not strict constraints for the system clock of this device, your system should work properly as long as the general guidelines highlighted in section 7.3.3 of the datasheet are followed.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

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PCM1802: No clocks or data output...am I doing something wrong?