STA538B datasheet(22/59 Pages) STMICROELECTRONICS

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STA538B 数据表(PDF) 22 Page - STMicroelectronics

部件名	STA538B

功能描述	2 x 1.3 W class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX

PDF	59 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

22 / 59 page

PLL

STA538

22/59

Example 1:

FXTI = 13 MHz

Fs = 44.1 kHz

IDF should be equal to 3 otherwise LDF become less than 8 (FRAC_CTRL must be 1):

LDF = floor(45.1584/(13/IDF)) = 10

FRACT = round([(45.1584/(13/ IDF))-floor(45.1584/(13/ IDF))]*216) = 27602

(where:

floor: rounded towards zero

round: rounded real number to nearest integer)

Using the above configuration, the system clock is 45.15841675 MHz, the approximate

static error is 16 Hz (that is, 0.5 ppm).

Example 2:

FXTI = 19.2 MHz

Fs = 48 kHz

IDF should be equal to 4 otherwise LDF become less than 8 (FRAC_CTRL must be 1):

LDF = floor(49.152/(19.2/IDF)) = 10

FRACT = round([(49.152/(19.2/IDF))-floor(49.152/(19.2/IDF))]*216) = 15728

Using the above configuration, the system clock is 49.151953125 MHz, the approximate

static error is 47 Hz (that is, 1 ppm).

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