參數(shù)資料
型號(hào)： MAX9273GTL/V+
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 26/49頁(yè)
文件大小： 0K
描述： IC SERIALIZER 22BIT GMSL 40TQFN
標(biāo)準(zhǔn)包裝： 50
系列： *
MAX9273
22-Bit GMSL Serializer with Coax or
STP Cable Drive
32
Maxim Integrated
cancels benefits. The deserializer tracks the serializer’s
spread and passes the spread to the deserializer output.
The programmable spread-spectrum amplitudes are
Q
0.5%, Q1%, Q1.5%, Q2%, Q3%, and Q4% (Table 6).
Some spread-spectrum amplitudes can only be used at
lower PCLKIN frequencies (Table 7). There is no PCLKIN
frequency limit for the Q0.5% spread rate.
When the spread spectrum is turned on or off, the serial
link stops for several microseconds and then restarts in
order for the deserializer to lose and relock to the new
serial-data stream.
The serializer includes a sawtooth divider to control the
spread-modulation rate. Autodetection of the PCLKIN
operation range guarantees a spread-spectrum modu-
lation frequency within 20kHz to 40kHz. Additionally,
manual configuration of the sawtooth divider (SDIV: 0x03,
D[5:0]) allows the user to set a modulation frequency
according to the PCLKIN frequency. When ranges are
manually selected, program the SDIV value for a fixed
modulation frequency around 20kHz.
Manual Programming of the
Spread-Spectrum Divider
The modulation rate relates to the PCLKIN frequency as
follows:
PCLKIN
M
f
(1 DRS)
MOD x SDIV
= +
where:
fM = Modulation frequency
DRS = DRS value (0 or 1)
fPCLKIN = PCLKIN frequency
MOD = Modulation coefficient given in Table 8
SDIV = 6-bit SDIV setting, manually programmed by the FC
To program the SDIV setting, first look up the modula-
tion coefficient according to the desired bus-width and
spread-spectrum settings. Solve the above equation for
SDIV using the desired pixel clock and modulation fre-
quencies. If the calculated SDIV value is larger than the
maximum allowed SDIV value in Table 8, set SDIV to the
maximum value.
Table 6. Serial Output Spread
Table 7. Spread Limitations
SS
SPREAD (%)
000
No spread spectrum. Power-up default.
001
±0.5% spread spectrum.
010
±1.5% spread spectrum.
011
±2% spread spectrum.
100
No spread spectrum.
101
±1% spread spectrum.
110
±3% spread spectrum.
111
±4% spread spectrum.
BWS = 0 MODE, PCLKIN
FREQUENCY (MHz)
BWS = 1 MODE PCLKIN
FREQUENCY (MHz)
SERIAL LINK BIT RATE
(Mbps)
AVAILABLE
SPREAD RATES
< 33.3
(DBL=0)
< 25
(DBL = 0)
< 1000
All rates available
< 66.6
(DBL = 1)
< 50
(DBL = 1)
33.3 to 50
(DBL = 0)
25 to 37.5
(DBL = 0)
R
1000
1.5%, 1.0%, 0.5%
66.6 to 100
(DBL = 1)
50 to 75
(DBL = 1)
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