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GS2965 датащи(PDF) 21 Page - Semtech Corporation

номер детали GS2965
подробное описание детали  Multi-Rate SDI Reclocker with Equalization & De-emphasis
PDF  41 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS2965 датащи(HTML) 21 Page - Semtech Corporation

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GS2965 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52462 - 4
July 2012
21 of 41
Proprietary & Confidential
NOTE: Changing the de-emphasis setting will vary both V1 & V2 (see Figure 4-2).
The DEn_EN pins are multiplexed with the serial host interface pins. The DEn_EN
functionality is enabled when pin HIF is tied HIGH, as shown in Table 4-7:
Figure 4-2: De-emphasis Waveform
4.10 Automatic and Manual Data Rate Selection
The GS2965 can be configured to manually lock to a specific data rate or automatically
search for and lock to the incoming data rate. The default configuration is AUTO mode.
This can be changed via the host interface.
In AUTO mode, the SS[1:0] registers become read only, and the bit pattern indicates the
data rate at which the PLL is currently locked to (or previously locked to). The search
algorithm cycles through the data rates and starts over if that data rate is not found (see
Figure 4-3).
A “search algorithm” cycles through the supported data rates until lock is achieved, as
shown in Figure 4-3 below.
Table 4-7: DEn_EN Pins Multiplexed
Pin
Function
SDO/DE0_EN
Active-high logic input to enable de-emphasis for high-speed input
channel 0.
SCK/DE1_EN
Active-high logic input to enable de-emphasis for high-speed input
channel 1.
V1
V2
-V1
-V2
Tx signal after de-emphasis
11110000 pattern
268
269
270
271
272
273
274
275
UI
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
De-emphasis (dB)
=20 log (V1/V2)



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