參數(shù)資料
型號： MAX9249GCM/V+T
廠商： Maxim Integrated Products
文件頁數(shù)： 17/36頁
文件大?。?/td> 0K
描述： IC SERIALIZER GMSL LVDS 48TQFP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 2,000
功能： 串行器
數(shù)據(jù)速率： 2.5Gbs
輸入類型： LVDS
輸出類型： 串行
電源電壓： 3 V ~ 3.6 V
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 48-TQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 帶卷 (TR)
24 _____________________________________________________________________________________
MAX9249
Gigabit Multimedia Serial Link
Serializer with LVDS System Interface
Both devices include a sawtooth divider to control the
spread-modulation rate. Autodetection or manual pro-
gramming of the RXCLKIN_ operation range guarantees
a spread-spectrum modulation 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 RXCLKIN_
frequency. Always keep the modulation frequency
between 20kHz to 40kHz to ensure proper operation.
Manual Programming of the
Spread-Spectrum Divider
The modulation rate for the MAX9249 relates to the
RXCLKIN_ frequency as follows:
(
) RXCLKIN_
M
f
1 DRS
MOD SDIV
=
+
×
where:
fM = Modulation frequency
DRS = DRS pin input value (0 or 1)
fRXCLKIN_ = LVDS clock frequency
MOD = Modulation coefficient given in Table 7
SDIV = 6-bit SDIV setting, manually programmed
by the FC
To program the SDIV setting, first look up the modulation
coefficient according to the part number and desired
bus-width and spread-spectrum settings. Solve the above
equation for SDIV using the desired pixel clock and modu-
lation frequencies. If the calculated SDIV value is larger
than the maximum allowed SDIV value in Table 7, set SDIV
to the maximum value.
Sleep Mode
The MAX9249/GMSL deserializer include low-power
sleep mode to reduce power consumption on the device
not attached to the FC (the GMSL deserializer in LCD
applications and the MAX9249 in camera applications).
Set the corresponding remote IC’s SLEEP bit to 1 to initi-
ate sleep mode. The MAX9249 sleeps immediately after
Table 6. Spread-Spectrum Rate Limitations
Table 7. Modulation Coefficients and Maximum SDIV Settings
3-CHANNEL MODE
RXCLKIN_ FREQUENCY
(MHz)
4-CHANNEL MODE
RXCLKIN_ FREQUENCY
(MHz)
SERIAL LINK BIT RATE
(Mbps)
AVAILABLE SPREAD
RATES
< 33.3
< 25
< 1000
All rates available
33.3 to < 66.7
20 to < 50
1000 to < 2000
1.5%, 1.0%, 0.5%
≥ 66.7
≥ 50
≥ 2000
0.5%
BUS-WIDTH MODE
SPREAD-SPECTRUM
SETTING (%)
MODULATION COEFFICIENT
(DECIMAL)
SDIV UPPER LIMIT
(DECIMAL)
4-Channel
0.5
104
63
1
104
40
1.5
152
54
2
204
30
3
152
27
4
204
15
3-Channel
0.5
80
63
1
80
52
1.5
112
63
2
152
42
3
112
37
4
152
21
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