LMH0356SQE-40/NOPB National Semiconductor, LMH0356SQE-40/NOPB Datasheet - Page 10

• Manufacturer Part Number: LMH0356SQE-40/NOPB
• Description: IC RECLOCKER SDI HD/SD 40-LLP
• Manufacturer: National Semiconductor
• Type: Reclockerr

Specifications of LMH0356SQE-40/NOPB

• Applications: SDTV/HDTV
• Mounting Type: Surface Mount
• Package / Case: 40-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMH0356SQE-40TR

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OPERATING SERIAL DATA RATES
This device operates at serial data rates of 270 Mbps, 1483
Mbps, 1485 Mbps, 2967 Mbps, and 2970 Mbps. The device
does not lock to harmonics of these rates. The device does
not lock and automatically enters the reclocker bypass mode
for the following data rates: 143 Mbps, 177 Mbps, 360 Mbps,
and 540 Mbps.
SERIAL DATA CLOCK/SERIAL DATA 2 OUTPUT
The Serial Data Clock/Serial Data 2 Output is controlled by
the SCO_EN input and provides either a second retimed se-
rial data output or a low jitter differential clock output appro-
priate to the serial data rate being processed. When operating
as a serial clock output, the rising edge of the clock will be
positioned within the corresponding serial data bit interval
within 10% of the center of the data interval.
Differential output SCO/SDO2 functions as the second serial
data output when the SCO_EN input is a logic-low level. This
output functions as the serial clock output when the SCO_EN
input is a logic-high level. The SCO_EN input has an internal
pull-down device and the default state of SCO_EN is low (se-
rial data output 2 enabled). SCO/SDO2 is muted when the
OUTPUT MUTE input is a logic low level. When the Bypass
mode is activated and this output is functioning as a serial
clock output, the output will also be muted. If an unsupported
data rate is used while in Auto Bypass mode with this output
functioning as a serial clock output, the output is invalid.
FIGURE 2. Equivalent SDO Output Circuit (SDO, SDO, SCO/SDO2, SCO/SDO2)
10
Control Inputs and Indicator
Outputs
SERIAL DATA RATE SELECTOR
The Serial Data Rate Selector (RATE [1:0]) permits the user
to fix the operating serial data rate. The pins have internal pull-
downs which maintain a logic-low input condition unless ex-
ternally driven to a logic-high condition. This input also serves
to place the device in a test mode. The codes shown in
1
then enters either the Auto-Rate Detect mode or a single op-
erating rate. Selecting the 270 Mbps rate mode may also be
used when reclocking DVB-ASI data. DVB-ASI data is
MPEG2 coded data that is transmitted in 8B10B coding. The
device will reclock this data without harmonic locking.
RATE [1:0]
select the desired operating serial data rate. The LMH0356
Code
00
01
10
TABLE 1. Data Rate Select Input Codes
Auto-Rate
Detect
mode
270 Mbps
1483/1485
Mbps,
2967/2970
Mbps
Data Rate
or Mode
May be used to support DVB-
ASI operation
30016709
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