Texas Instruments TLV320AIC12KEVMB-K appendix Control Register 2 Tab Control Register 3 Tab

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Figure 8. Control Register 2 Tab

6.8.3Control Register 3 Tab

The Control Register 3 Tab (Figure 9) allows the user to set the DAC Oversampling Rate (OSR), set the Asynchronous Sampling Rate Factor and power down the ADC or DAC with the Power Down Controls. The indicator below each power down switch will light when on only if the register data sent by pressing the Program Device button is acknowledged. The USB-MODEVM Audio Interface Configuration currently allows a fixed sampling rate and a single codec. For an OSR=256 the value of M, set in register 4, must be a multiple of 2. Similarly, for an OSR=512 the value of M must be a multiple of 4.

Figure 9. Control Register 3 Tab

6.8.4Control Register 4 Tab

The Control Register 4 Tab (Figure 10) provides controls for P, N and M. Furthermore, an FS calculator is provided for convenience. The calculator derives FS from the MCLK frequency entered by the user or loaded by a preset by using the equation: FS=MCLK÷(16×P×M×N). The PLL Method switch illustrates that for coarse sampling, P must be equal to 8. Please note that the FS calculator and the PLL Method

SLAU229B–October 2007–Revised August 2008 TLV320AIC12KEVMB-K and TLV320AIC14KEVMB-K User's Guide 17

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