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M21528-13 Datasheet(PDF) 18 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) 18 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
18
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.4
Power Supply Description
The device features two internal regulators to supply the power for the output drivers for each channel. AVDDO0
and AVDDO1 supply the voltage to each channel’s respective regulator. These pins may be connected to DC
voltages ranging from 1.8V to 3.3V. Each regulator requires an external 1µF bypass capacitor to ground, which
must be connected to AVDDReg0 and AVDDReg1. It is recommended to add a secondary 10 nF bypass capacitor
on each regulator output as close to the pin as possible.
In addition to supplying the output stage for channel1, AVDDO1 is also used to power the core circuitry for both
channels.
A completely separate supply domain, AVDDI, provides the supply for the high-speed serial input pins. The input
termination and ESD protection for the SDI pins and the digital control input pins are referenced to this supply. The
isolated domain allows DC coupling to an upstream device that is running from a different supply voltage. For
example, if, in order to save power, AVDDO0/1 are connected to 1.8V, but the cable driver must interface to a
reclocker that uses a 3.3V supply, then DC coupling can be achieved by simply connecting AVDDI to the 3.3V rail.
Figure 4-3 to 4-5 show three examples of how the cable driver can be configured. Note that even when only one
channel is enabled, both output regulators must be supplied with the correct voltage.
Figure 4-3.
Supply configuration, both channels and both A and B outputs used
1.2V to 3.3V
1.8V to 3.3V
0.1uF
AVDDReg0
AVDDO0
AVDDO1
AVDDReg1
PD1
PD0
AVDDI
1μF
1μF
10 nF
10 nF


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