PCM1860: Sanity check on clock use and microphone gain

Jan Polivka

Part Number: PCM1860

Good morning,

I am looking into PCM1860 for sampling. I've been reading through the datasheet and I want to make sure I am getting it right.

1. If I provide a Quartz Crystal 24.576MHz on pins XO and XI, I don't have to worry about SCKI pin, correct?

2. If I want to amplify an analog microphone signal, I can use pins MD6, MD5 and MD2 and set them to appropriate values (e.g. 000 to amplify mic signal on channel 1)

Kind regards,

Jan

over 7 years ago

0 Jan Polivka over 7 years ago

Prodigy 230 points

I should also add that I want to use PCM1860 in slave mode and have Arduino MKR1000 as the I2S master.

0 Diego Melendez over 7 years ago in reply to Jan Polivka

TI__Guru 57800 points

Hi, Jan,

1- The PCM1860 is capable of operating with an external crystal to generate the internal clocks of the device. As you mention, when using a crystal, the SCKI is not required. Please keep in mind that this configuration is possible when the device is set as the Master device of the I²S bus. If the device is configured as slave, and the I²S master does not have a valid SCKI clock on the bus, the PCM1860 can operate in Slave PLL mode, where the internal clocks are generated on-chip with the internal PLL using BCLK as source clock. This operating mode is automatic and will operate as long as the I²S clocks operates with standard audio rates.

2- Correct. MD6/5/2 are used to configure the gain for a given input channel.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Jan Polivka over 7 years ago in reply to Diego Melendez

Prodigy 230 points

Good morning,

thank you very much :)

Jan

Audio

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PCM1860: Sanity check on clock use and microphone gain