LMH0056_15 Datasheet, PDF (9/20 Pages) Texas Instruments – HD/SD SDI Reclocker with 4:1 Input Multiplexer

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SDI[3:0]
V_CC
20 k:
LMH0056
SNLS236C – AUGUST 2006 – REVISED APRIL 2013
V_CC
1 pF
2 k:
80 k:
2 k:
V_CC
SDI[3:0]
Figure 2. Equivalent SDI Input Circuit (SDI[3:0], SDI[3:0])
SDO, SCO/SDO2
V_CC
V_CC
50: 50:
V_CC
SDO, SCO/SDO2
Figure 3. Equivalent SDO Output Circuit (SDO, SDO, SCO/SDO2, SCO/SDO2)
OPERATING SERIAL DATA RATES
This device operates at serial data rates of 143 Mbps, 270 Mbps, 1483 Mbps and 1485 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: 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 serial data output or a low jitter differential clock output appropriate 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 data-rate 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 (serial data output 2
enabled). SCO/SDO2 is muted when the 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.
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