MAX9273GTL+ Maxim Integrated, MAX9273GTL+ Datasheet - Page 32

• Manufacturer Part Number: MAX9273GTL+
• Description: Serializers & Deserializers - Serdes 1.5Gbps 22-bit Coax/STP serializer
• Manufacturer: Maxim Integrated
• Type: Serializerr

Specifications of MAX9273GTL+

• Rohs: yes
• Data Rate: 1.5 Gbit/s
• Input Type: CMOS/LVCMOS
• Output Type: CML
• Number Of Inputs: 22
• Number Of Outputs: 1
• Operating Supply Voltage: 1.7 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: TQFN-40 EP
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

Table 6. Serial Output Spread
Table 7. Spread Limitations
cancels benefits. The deserializer tracks the serializer’s
spread and passes the spread to the deserializer output.
The programmable spread-spectrum amplitudes are
Q0.5%, Q1%, Q1.5%, Q2%, Q3%, and Q4%
Some spread-spectrum amplitudes can only be used at
lower PCLKIN frequencies
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.
Maxim Integrated
BWS = 0 MODE, PCLKIN
FREQUENCY (MHz)
66.6 to 100
(DBL = 1)
33.3 to 50
(DBL = 0)
(DBL = 1)
(DBL=0)
< 33.3
< 66.6
000
001
010
011
100
101
110
111
SS
(Table
7). There is no PCLKIN
No spread spectrum. Power-up default.
±0.5% spread spectrum.
±1.5% spread spectrum.
±2% spread spectrum.
No spread spectrum.
±1% spread spectrum.
±3% spread spectrum.
±4% spread spectrum.
22-Bit GMSL Serializer with Coax or
BWS = 1 MODE PCLKIN
FREQUENCY (MHz)
25 to 37.5
(DBL = 0)
(DBL = 1)
(DBL = 0)
(DBL = 1)
50 to 75
< 25
< 50
(Table
6).
The modulation rate relates to the PCLKIN frequency as
follows:
where:
f
DRS = DRS value (0 or 1)
f
MOD = Modulation coefficient given in
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
maximum value.
M
PCLKIN
= Modulation frequency
SERIAL LINK BIT RATE
= PCLKIN frequency
SPREAD (%)
(Mbps)
< 1000
R 1000
f
M
=
STP Cable Drive
(1 DRS)
Manual Programming of the
+
Spread-Spectrum Divider
MOD x SDIV
f
PCLKIN
Table
MAX9273
All rates available
1.5%, 1.0%, 0.5%
SPREAD RATES
AVAILABLE
8, set SDIV to the
Table 8
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