gs9076 Gennum Corporation, gs9076 Datasheet - Page 16

• Manufacturer Part Number: gs9076
• Description: Sd-sdi Automatic Reclocker With Dual Differential Outputs
• Manufacturer: Gennum Corporation

4. Detailed Description
4.1 Slew Rate Phase Lock Loop (S-PLL)
The GS9076 is a SD-SDI Serial Digital Reclocker designed to automatically
recover the embedded clock from a digital video signal and re-time the incoming
video data.
The GS9076 will recover the embedded clock signal and re-time the data from a
SMPTE 259M-C compliant digital video signal.
Using the functional block diagram
Loop (S-PLL) on page 16
the GS9076 in detail.
The term “slew” refers to the output phase of the PLL in response to a step change
at the input. Linear PLLs have an output phase response characterized by an
exponential response whereas an S-PLL’s output is a ramp response (see
Figure
signal analysis is not possible with an S-PLL.
Figure 4-1: PLL Characteristics
44617 - 1
0.2
0.1
0.0
0.2
0.1
0.0
4-1). Because of this non-linear response characteristic, traditional small
LINEAR (CONVENTIONAL) PLL RESPONSE
January 2008
SLEW PLL RESPONSE
INPUT
INPUT
OUTPUT
OUTPUT
to
Lock and LOS on page 20
(page
2) as a guide,
GS9076 Data Sheet
describes each aspect of
Slew Rate Phase Lock
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