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參數(shù)資料
| 型號： | MAX9249GCM/V+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 16/36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(biāo)準(zhǔn)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) |
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______________________________________________________________________________________ 23
MAX9249
Gigabit Multimedia Serial Link
Serializer with LVDS System Interface
*Negative preemphasis levels denote deemphasis.
Preemphasis Driver
The serial line driver in the MAX9249 employs cur-
rent-mode logic (CML) signaling. The driver can be
programmed to generate a preemphasized waveform
according to the cable length and characteristics. There
are 13 preemphasis settings, as shown in Table 4.
Negative preemphasis levels are deemphasis levels in
which the swing is the same as normal, but the no-tran-
sition data is deemphasized. Program the preemphasis
levels through register 0x05 D[3:0] of the MAX9249. This
preemphasis function compensates the high-frequency
loss of the cable and enables reliable transmission over
longer link distances. Additionally, a lower power-drive
mode can be entered by programming CMLLVL bits
(0x05 D[5:4]) to reduce the driver strength down to
75% (CMLLVL = 10) or 50% (CMLLVL = 01) from 100%
(CMLLVL = 11, default).
Spread Spectrum
To reduce the EMI generated by the transitions on the
serial link and outputs of the GMSL deserializer, both
the MAX9249 and GMSL deserializer support spread
spectrum. Turning on spread spectrum on the MAX9249
spreads the serial data and the GMSL deserializer out-
puts. Do not enable spread for both the MAX9249 and
GMSL deserializer. The six selectable spread-spectrum
rates at the MAX9249 serial output are ±0.5%, ±1%,
±
1.5%, ±2%, ±3%, and ±4% (Table 5). Some spread-
spectrum rates can only be used at lower RXCLKIN_
frequencies (Table 6). There is no RXCLKIN_ frequency
limit for the 0.5% spread rate.
Set the MAX9249 SSEN input high to select 0.5% spread
at power-up and SSEN input low to select no spread at
power-up. The state of SSEN is latched upon power-up
or when resuming from power-down mode. Whenever
the MAX9249 spread spectrum is turned on or off, the
serial link automatically restarts and remains unavailable
while the GMSL deserializer relocks to the serial data.
Turning on spread spectrum on the MAX9249 or GMSL
deserializer does not affect the audio data stream.
Changes in the MAX9249 spread settings only affect
the GMSL deserializer MCLK output if it is derived from
RXCLKIN_ (MCLKSRC = 0).
Table 4. CML Driver Strength (Default Level, CMLLVL = 11)
Table 5. Serial Output Spread
PREEMPHASIS LEVEL
(dB)*
PREEMPHASIS
SETTING
(0x05, D[3:0])
ICML
(mA)
IPRE
(mA)
SINGLE-ENDED VOLTAGE SWING
MAX
(mV)
MIN
(mV)
-6.0
0100
12
4
400
200
-4.1
0011
13
3
400
250
-2.5
0010
14
2
400
300
-1.2
0001
15
1
400
350
0
0000
16
0
400
1.1
1000
16
1
425
375
2.2
1001
16
2
450
350
3.3
1010
16
3
475
325
4.4
1011
16
4
500
300
6.0
1100
15
5
500
250
8.0
1101
14
6
500
200
10.5
1110
13
7
500
150
14.0
1111
12
8
500
100
SS
SPREAD (%)
000
No spread spectrum.
Power-up default when SSEN = low.
001
Q
0.5% spread spectrum.
Power-up default when SSEN = high.
010
Q
1.5% spread spectrum
011
Q
2% spread spectrum
100
No spread spectrum
101
Q
1% spread spectrum
110
Q
3% spread spectrum
111
Q
4% spread spectrum
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