AD1939 CODEC sample rate

Hello DKF638.

Notice that for each setting there are three sample rates shown.

32/44.1/48kHz

64/88.2/96kHz

128/176.4/192kHz

Note that this register setting only adjusts a divider to divide the master clock.

So here is the list again but with the divider added that divides down from the master clock.

32/44.1/48kHz, MCLK divided by 256

64/88.2/96kHz, MCLK divided by 128

128/176.4/192kHz, MCLK divided by 64

So which of the three sampling rates you get depends on the master clock rate. 

If you use a 12.288MHz master clock then the three register settings will give you 48, 96, or 192kHz fs.

So you will need to change the master clock to be 128 x 64 = 8.192MHz. 

This is still within the range of the PLL so all you need to do is change the crystal to an 8.192MHz crystal ( or change the master clock source ) and you will be running at 32, 64 or 128kHz sampling rates. 

Dave T

thanks very much

thanks very much