PCM5121 datasheet(49/121 Pages) TI2

49 / 121 page

PCM5121, PCM5122

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SLAS763C – AUGUST 2012 – REVISED OCTOBER 2018

Product Folder Links: PCM5121 PCM5122

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Below are details of the register locations, as well as the nomenclature for the table of registers found at the end

of this document.

Table 35. PLL Registers

DIVIDER

FUNCTION

BITS

PLLE

PLL enable

Page 0, Register 4, D(0)

PPDV

PLL P

Page 0, Register 20, D(3:0)

PJDV

PLL J

Page 0, Register 21, D(5:0)

PDDV

PLL D

Page 0, Register 22, D(5:0)

Page 0, Register 23, D(7:0)

PRDV

PLL R

Page 0, Register 24, D(3:0)

Table 36. PLL Configuration Recommendations

COLUMN

DESCRIPTION

fS (kHz)

Sampling frequency

RSCK

Ratio between sampling frequency and SCK frequency (SCK frequency = RSCK × sampling frequency)

SCK (MHz)

System master clock frequency at SCK input (pin 20)

PLL VCO (MHz) PLL VCO frequency as PLLCK in Figure 63

One of the PLL coefficients in Equation 3

PLL REF (MHz)

Internal reference clock frequency which is produced by SCK / P

M = K * R

The final PLL multiplication factor computed from K and R as described in Equation 3

K = J.D

One of the PLL coefficients in Equation 3

PLL fS

Ratio between fS and PLL VCO frequency (PLL VCO / fS)

DSP fS

Ratio between audio processor operating clock rate and fS (PLL fS / NMAC)

NMAC

The audio processor clock divider value in Table 34

DSP CLK (MHz) The audio processor operating frequency as DSPCK in Figure 63

MOD fS

Ratio between DAC operating clock frequency and fS (PLL fS / NDAC)

MOD f (kHz)

DAC operating frequency as DACCK in Figure 63

NDAC

DAC clock divider value in Table 34

DOSR

OSR clock divider value in Table 34 for generating OSRCK in Figure 63. DOSR must be chosen so that MOD fS / DOSR

= 16 for correct operation.

NCP

NCP (negative charge pump) clock divider value in Table 34

CP f

Negative charge pump clock frequency (fS × MOD fS / NCP)

% Error

Percentage of error between PLL VCO / PLL fS and fS (mismatch error).

•

This number is typically zero but can be non-zero especially when K is not an integer (D is not zero).

•

This number may be non-zero only when the PCM512x acts as a master.

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