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MAX9259 Datasheet, PDF (34/51 Pages) Maxim Integrated Products – Gigabit Multimedia Serial Link with Spread Spectrum and Full-Duplex Control Channel
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Gigabit Multimedia Serial Link with Spread
Spectrum and Full-Duplex Control Channel
Table 10. MAX9260 Parallel Output Spread
SS
SPREAD (%)
00
No spread spectrum. Power-up default when SSEN = low.
01
Q2% spread spectrum. Power-up default when SSEN = high.
10
No spread spectrum
11
Q4% spread spectrum
Table 11. MAX9259 Modulation Coefficients and Maximum SDIV Settings
BIT-WIDTH MODE
32-Bit
24-Bit
SPREAD-SPECTRUM
SETTING (%)
1
0.5
3
1.5
4
2
1
0.5
3
1.5
4
2
MODULATION
COEFFICIENT (decimal)
104
104
152
152
204
204
80
80
112
112
152
152
SDIV UPPER LIMIT (deci-
mal)
40
63
27
54
15
30
52
63
37
63
21
42
Table 12. MAX9260 Modulation Coefficients and Maximum SDIV Settings
SPREAD-SPECTRUM SETTING (%)
4
2
MODULATION COEFFICIENT (deci-
mal)
208
208
SDIV UPPER LIMIT (decimal)
15
30
or off, the serial link automatically restarts and remains
unavailable while the MAX9260 relocks to the serial data.
Turning on spread spectrum on either the MAX9259 or
MAX9260 side does not affect the audio data stream.
Changes in the MAX9259 spread settings only affect
MCLK output if it is derived from PCLK_ (MCLKSRC = 0).
Both devices include a sawtooth divider to control the
spread-modulation rate. Autodetection or manual pro-
gramming of the PCLK_ operation range guarantees a
spread-spectrum modulation frequency within 20kHz to
40kHz. Additionally, manual configuration of the saw-
tooth divider (SDIV, 0x03 D[5:0]) allows the user to set a
specific modulation frequency for a specific PCLK_ rate.
Always keep the modulation frequency between 20kHz
to 40kHz to ensure proper operation.
Manual Programming of the Spread-
Spectrum Divider
The modulation rates for the MAX9259 or the MAX9260
relate to the PCLK_ frequency as follows:
where:
fM
=
(1+
DRS) fPCLK_
MOD × SDIV
fM = Modulation frequency
DRS = DRS pin input value (0 or 1)
fPCLK_ = Parallel clock frequency (12.5MHz to 104MHz)
MOD = Modulation coefficient given in Table 11 for the
MAX9259 and Table 12 for the MAX9260
SDIV = 6-bit (MAX9259) or 5-bit (MAX9260) SDIV setting,
manually programmed by the FC
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