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M21528-13 Datasheet(PDF) 21 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) 21 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
21
Dual 3G/HD/SD-SDI Multi-rate Video Cable Driver
Rev V4
4.5.3
Powerdown Mode Control
The M21528 has integrated output cable detection and input LOS detection circuitry. Depending on the setting of
the PD_MODE pin, the device can automatically power down each channel when output cables are disconnected
or there is no signal present at the input.
The functionality of the PD_MODE pin is summarized in the table below.
Table 4-5.
Operation of PD_MODE
Pin
Level
Function
PD_MODE
L
Cable detection disabled
Power down on LOS disabled
F
Cable detection enabled
Power down on LOS enabled
H
Cable detection enabled
Power down on LOS disabled
4.6
Cable Detection
The M21528 features an integrated near-end cable detector. This circuit can detect whether a cable has been
disconnected from an output and whether or not it is reconnected without requiring any additional external
components.
Utilizing the cable detection feature has several system level advantages such as:
Reduced power consumption when no cable is connected to both outputs of a single channel
Reduced EMI
Eliminate the requirement for external termination
Depending on the state of the PD_MODE pin, when both output A and B of either channel are disconnected, the
device can automatically power down the channel resulting in a 75% power reduction for that channel.
Furthermore, if output B is manually powered down (PD = L), then disconnecting output A will result in completely
powering down the channel (both outputs).
Due to the detection mechanism, the signal at each output within a channel will experience a phase step of
approximately 15 ps when the other output’s state is changed: powered down, powered up, disconnected, or re-
connected.
If one output is disconnected but the other remains connected, and both outputs are toggling, the signal at the
connected output may experience up to 10% overshoot for a period of approximately 500 ns. The overshoot is
caused by the reflections coupled from the unconnected output to the connected one. 500 ns is the duration
required by the circuit to detect the disconnection. If cable detection is disabled and the output is not properly
terminated, the overshoot will persist. Therefore, it is strongly recommended to enable cable detection, or
terminate both outputs properly; when both outputs of one channel are turned on.
The cable detection function may be disabled by setting PD_MODE=L.


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