MAX9217ECM Maxim Integrated, MAX9217ECM Datasheet - Page 10

• Manufacturer Part Number: MAX9217ECM
• Description: Serializers & Deserializers - Serdes 27-Bit DC-Balanced Serializer
• Manufacturer: Maxim Integrated
• Type: Serializerr

Specifications of MAX9217ECM

• Data Rate: 700 Mbit/s
• Input Type: LVCMOS/LVTTL
• Output Type: LVDS
• Number Of Inputs: 27
• Number Of Outputs: 1
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TQFP-48
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

27-Bit, 3MHz-to-35MHz
DC-Balanced LVDS Serializer
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 MAX9217
serializer can also be DC-coupled to the MAX9218
deserializer.
Figure 9. Transition Timing
10
CNTL_IN
PCLK_IN
RGB_IN
______________________________________________________________________________________
DE_IN
CONTROL
PHASE
= NOT SAMPLED BY PCLK_IN
Applications Information
AC-Coupling Benefits
TRANSITION
PHASE
Transition Timing
VIDEO PHASE
Figure 10 shows an AC-coupled serializer and deserial-
izer with two capacitors per link, and Figure 11 is the
AC-coupled serializer and deserializer with four capaci-
tors per link.
See Figure 12 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 MAX9217 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 MAX9217.
Selection of AC-Coupling Capacitors
Frequency-Range Setting RNG[1:0]
TRANSITION
PHASE
CONTROL
PHASE