MAX9247ECM+ Maxim Integrated Products, MAX9247ECM+ Datasheet - Page 11

• Manufacturer Part Number: MAX9247ECM+
• Description: IC SERIALIZER LVDS 48-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX9247ECM+

• Function: Serializer
• Data Rate: 840Mbps
• Input Type: Serial
• Output Type: LVDS
• Number Of Inputs: 18
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The transition words require interconnect bandwidth
and displace control data. Therefore, control data is not
sampled (see Figure 9):
• Two clock cycles before DE_IN goes high
• During the video phase
• Two clock cycles after DE_IN goes low
The last sampled control data are latched at the deserial-
izer control data outputs during the transition and video
phases. Video data are latched at the deserializer RGB
data outputs during the transition and control phases.
AC-coupling increases the common-mode voltage to
the voltage rating of the capacitor. Two capacitors are
sufficient for isolation, but four capacitors—two at the
serializer output and two at the deserializer input—pro-
vide protection if either end of the cable is shorted to a
high voltage. AC-coupling blocks low-frequency
ground shifts and common-mode noise. The MAX9247
serializer can also be DC-coupled to the MAX9248/
MAX9250 deserializers.
Figures 10 and 12 show an AC-coupled serializer and
deserializer with two capacitors per link. Figures 11 and
Figure 9. Transition Timing
PCLK_IN
CNTL_IN
RGB_IN
DE_IN
CONTROL
Applications Information
PHASE
= NOT SAMPLED BY PCLK_IN
______________________________________________________________________________________
AC-Coupling Benefits
TRANSITION
Transition Timing
PHASE
DC-Balanced LVDS Serializer
27-Bit, 2.5MHz-to-42MHz
VIDEO PHASE
13 show the AC-coupled serializer and deserializer with
four capacitors per link.
See Figure 14 for calculating the capacitor values for
AC-coupling depending on the parallel clock frequen-
cy. The plot shows capacitor values for two- and four-
capacitor-per-link systems. For applications using less
than 18MHz clock frequency, use 0.1µF capacitors.
The RNG[1:0] inputs select the operating frequency
range of the MAX9247 serializer. An external clock with-
in this range is required for operation. Table 3 shows
the selectable frequency ranges and corresponding
data rates for the MAX9247.
Table 3. Parallel Clock Frequency Range
Select
RNG1
0
0
1
1
Selection of AC-Coupling Capacitors
RNG0
Frequency-Range Setting RNG[1:0]
0
1
0
1
CLOCK (MHz)
PARALLEL
10 to 20
20 to 42
2.5 to 5
TRANSITION
5 to10
PHASE
SERIAL-DATA RATE
CONTROL
PHASE
100 to 200
200 to 400
400 to 840
50 to 100
(Mbps)
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