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M21528-13 Datasheet(PDF) 20 Page - M/A-COM Technology Solutions, Inc.

Part No. M21528-13
Description  Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
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Maker  MA-COM [M/A-COM Technology Solutions, Inc.]
Homepage  http://www.macomtech.com
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M21528-13 Datasheet(HTML) 20 Page - M/A-COM Technology Solutions, Inc.

 
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M21528-13
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
http://www.macom.com/support
20
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.5
Logic Control Signals
The digital logic control signals are ESD protected and referenced to the AVDDI. This allows the device to interface
to many different logic levels from different supply domains.
Some pins have a state called “F”; this stands for “floating”. To assert this state leave the pin unconnected.
4.5.1
Slew Rate Control
Pins SD/xHD0 and SD/xHD1 control the slew rate of the associated channel outputs. To comply with the SMPTE
SD specification the slew rate is slowed down to approximately 600 ps when in SD mode. Note that there is no pull-
up on the SD/xHD pins, so it should not be left floating.
Table 4-3.
Operation of SD/xHD0 and SD/xHD1 Pins
Pin
Level
Function
SD/xHD0
L
Set SDO0A/B Slew rate to 3G/HD Levels
H
Set SDO0A/B Slew rate to SD Levels
SD/xHD1
L
Set SDO1A/B Slew rate to 3G/HD Levels
H
Set SDO1A/B Slew rate to SD Levels
4.5.2
Crosspoint Control
The XPT_CTRL pin controls the 2 x 2 crosspoint at the input. It can be used to redirect the input signal to the other
output or from channel 0 to make broadcast mode, so the input on channel 0 appears on both channel 0 and 1
outputs. This last mode is useful in distribution amplifiers where one input can drive fours positive outputs.
The crossover feature can be used in routers to select a second input bank. The functionality of the XPT_CTRL pin
is summarized in the table below.
Table 4-4.
Operation of XPT_CTRL Pin
Pin
Level
Function
XPT_CTRL
L
Crossover mode:
SDI0 routed to SDO1
SDI1 routed to SDO0
F
Default mode:
SDI0 routed to SDO0
SDI1 routed to SDO1
H
Broadcast mode:
SDI0 routed to SDO0 and SDO1


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