sta33013tr STMicroelectronics, sta33013tr Datasheet - Page 20

• Manufacturer Part Number: sta33013tr
• Description: 2.0 Digital Audio Processor With Ffx Digital Modulator And Analog And Digital Inputs
• Manufacturer: STMicroelectronics

PLL
20/55
In the following examples floor means rounded towards zero and round means rounded to
nearest integer.
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
f
LDF = floor(45.1584 / (13 / IDF)) = 10
FRACT = round([(45.1584 / (13 / IDF)) - floor(45.1584 / (13 / IDF))] * 2
F
f
LDF = floor(49.152 / (19.2 / IDF)) = 10
FRACT = round([(49.152 / (19.2 / IDF)) - floor(49.152 / (19.2 / IDF))] * 2
S
S
XTI
XTI
= 44.1 kHz
= 48 kHz
= 13 MHz
= 19.2 MHz
16
16
) = 27602
) = 15728
STA330