TAS2553_15 datasheet(36/58 Pages) TI

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0.5 PLL _ CLKI

PLL _ C K

N J.

TAS2553

SLAS978B – SEPTEMBER 2013 – REVISED FEBRUARY 2014

www.ti.com

7.5.10 Register 0x08: PLL Control Register 1

The equation for the PLL frequency is:

(2)

J = 4, 5, 6, … 96

D = 0, 1, 2, ... 9999

P = 0,1

Registers 0x08 – 0x0A will only update when the PLL is disabled. To update the J, D, and P coefficients, set

PLL_EN = 0 (Register 0x02, Bit 3) to disable the PLL, update Registers 0x08 – 0x0A, then set PLL_EN = 1 to

activate the PLL.

BIT

NAME

READ / WRITE

DEFAULT

DESCRIPTION

PLL_PRESCALE_SEL

R/W

PLL P Pre-Scale Select

1: P = 1

0: P = 0

6-0

PLL_J

R/W

001 0000

PLL J Characteristic Multiplier Value

000 0000 … 000 0011: Do not use

000 0100: J=4

…

001 0000: J=16

…

101 1111: J=95

110 0000: J=96

110 0001 ... 111 1111: Do not use

7.5.11 Register 0x09: PLL Control Register 2

READ /

BIT

NAME

DEFAULT

DESCRIPTION

WRITE

PLL_BYPASS

R/W

1: Bypasses PLL by setting PLL_CLK = PLL_CLKIN

0: Sets PLL_CLK according to Equation 2

Reserved

5-0

PLL_D[13:8]

R/W

00 0000

PLL D Mantissa Multiplier Value (LSB)

The complete PLL D value comprises PLL_D[13:8] (MSB) concatenated

with PLLD[7:0] (LSB)

00 0000 0000 0000: D=0000

00 0000 0000 0001: D=0001

…

10 0111 0000 1110: D=9998

10 0111 0000 1111: D=9999

10 0111 0001 0000 ... 11 1111 1111 1111: Do not use

7.5.12 Register 0x0A: PLL Control Register 3

READ /

BIT

NAME

DEFAULT

DESCRIPTION

WRITE

7-0

PLL_D[7:0]

R/W

0000 0000

PLL D Mantissa Multiplier Value (LSB)

The complete PLL D value comprises PLL_D[13:8] (MSB) concatenated

with PLLD[7:0] (LSB)

00 0000 0000 0000: D=0000

00 0000 0000 0001: D=0001

…

10 0111 0000 1110: D=9998

10 0111 0000 1111: D=9999

10 0111 0001 0000 ... 11 1111 1111 1111: Do not use

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