ADAU1361BCPZ-R7 datasheet(25/78 Pages) AD

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Data Sheet

ADAU1361

CLOCKING AND SAMPLING RATES

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Rev. E | 25 of 78

For example, if MCLK = 12 MHz and fS = 48 kHz, then

PLL required output = 1024 × 48 kHz = 49.152 MHz

R + (N/M) = 49.152 MHz/12 MHz = 4 + (12/125)

Common fractional PLL parameter settings for 44.1 kHz and 48 kHz

sampling rates can be found in Table 16 and Table 17.

The PLL outputs a clock in the range of 41 MHz to 54 MHz, which

should be taken into account when calculating PLL values and

MCLK frequencies.

Table 15. PLL Control Register (Register R1, Address 0x4002)

Bits

Bit Name

Description

[47:32]

M[15:0]

Denominator of the fractional PLL: 16-bit binary number

0x00FD: M = 253 (default)

[31:16]

N[15:0]

Numerator of the fractional PLL: 16-bit binary number

0x000C: N = 12 (default)

[14:11]

R[3:0]

Integer part of PLL: four bits, only values 2 to 8 are valid

0010: R = 2 (default)

0011: R = 3

0100: R = 4

0101: R = 5

0110: R = 6

0111: R = 71000: R = 8

[10:9]

X[1:0]

PLL input clock divider

00: X = 1 (default)

01: X = 2

10: X = 3

11: X = 4

Type

PLL operation mode

0: Integer (default)

1: Fractional

Lock

PLL lock (read-only bit)

0: PLL unlocked (default)

1: PLL locked

PLLEN

PLL enable

0: PLL disabled (default)

1: PLL enabled

Table 16. Fractional PLL Parameter Settings for fS = 44.1 kHz (PLL Output = 45.1584 MHz = 1024 × fS)

MCLK Input (MHz)

Input Divider (X)

Integer (R)

Denominator (M)

Numerator (N)

R2: PLL Control Setting (Hex)

625

403

0x0271 0193 2901

625

477

0x0271 01DD 1901

8125

3849

0x1FBD 0F09 1901

14.4

125

0x007D 0022 3301

19.2

125

0x007D 0058 2301

19.68

1025

604

0x0401 025C 2301

19.8

1375

772

0x055F 0304 2301

625

477

0x0271 01DD 1B01

8125

3849

0x1FBD 0F09 1B01

1875

647

0x0753 0287 1B01

Table 17. Fractional PLL Parameter Settings for fS = 48 kHz (PLL Output = 49.152 MHz = 1024 × fS)

MCLK Input (MHz)

Input Divider (X)

Integer (R)

Denominator (M)

Numerator (N)

R2: PLL Control Setting (Hex)

125

0x007D 0012 3101

125

0x007D 000C 2101

1625

1269

0x0659 04F5 1901

14.4

0x004B 003E 3301

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