sta538 STMicroelectronics, sta538 Datasheet - Page 22
sta538
Manufacturer Part Number
sta538
Description
2 X 1.3 W Class-d Amplifier With Analog Or Digital Input 2.0 Multichannel Digital Audio Processor With Ffx
Manufacturer
STMicroelectronics
Datasheet
1.STA538.pdf
(59 pages)
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PLL
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Example 1:
IDF should be equal to 3 otherwise LDF become less than 8 (FRAC_CTRL must be 1):
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:
IDF should be equal to 4 otherwise LDF become less than 8 (FRAC_CTRL must be 1):
Using the above configuration, the system clock is 49.151953125 MHz, the approximate
static error is 47 Hz (that is, 1 ppm).
F
Fs = 44.1 kHz
LDF = floor(45.1584/(13/IDF)) = 10
FRACT = round([(45.1584/(13/ IDF))-floor(45.1584/(13/ IDF))]*2
(where:
floor: rounded towards zero
round: rounded real number to nearest integer)
F
Fs = 48 kHz
LDF = floor(49.152/(19.2/IDF)) = 10
FRACT = round([(49.152/(19.2/IDF))-floor(49.152/(19.2/IDF))]*2
XTI
XTI
= 13 MHz
= 19.2 MHz
16
16
) = 27602
) = 15728
STA538
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