MAX9249GCM/V+T Maxim Integrated Products, MAX9249GCM/V+T Datasheet - Page 24

• Manufacturer Part Number: MAX9249GCM/V+T
• Description: IC SERIALIZER GMSL LVDS 48TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX9249GCM/V+T

• Function: Serializer
• Data Rate: 2.5Gbs
• Input Type: LVDS
• Output Type: Serial
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Outputs: -
• Number Of Inputs: -

Gigabit Multimedia Serial Link
Serializer with LVDS System Interface
Table 6. Spread-Spectrum Rate Limitations
Table 7. Modulation Coefficients and Maximum SDIV Settings
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.
The modulation rate for the MAX9249 relates to the
RXCLKIN_ frequency as follows:
where:
24
BUS-WIDTH MODE
RXCLKIN_ FREQUENCY
_____________________________________________________________________________________
3-CHANNEL MODE
4-Channel
3-Channel
33.3 to < 66.7
< 33.3
≥ 66.7
(MHz)
f
M
=
(
1 DRS
Manual Programming of the
+
Spread-Spectrum Divider
)
SPREAD-SPECTRUM
MOD
f
RXCLKIN_
RXCLKIN_ FREQUENCY
SETTING (%)
×
4-CHANNEL MODE
SDIV
0.5
1.5
0.5
1.5
1
2
3
4
1
2
3
4
20 to < 50
(MHz)
< 25
≥ 50
MODULATION COEFFICIENT
f
DRS = DRS pin input value (0 or 1)
f
MOD = Modulation coefficient given in Table 7
SDIV = 6-bit SDIV setting, manually programmed
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.
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
M
RXCLKIN_
SERIAL LINK BIT RATE
= Modulation frequency
(DECIMAL)
1000 to < 2000
104
104
152
204
152
204
112
152
112
152
80
80
by the FC
(Mbps)
< 1000
≥ 2000
= LVDS clock frequency
SDIV UPPER LIMIT
AVAILABLE SPREAD
1.5%, 1.0%, 0.5%
All rates available
(DECIMAL)
RATES
63
40
54
30
27
15
63
52
63
42
37
21
0.5%
Sleep Mode