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Gennum - SD Clock and Timing Generator

Numéro de référence GS4901B
Description SD Clock and Timing Generator
Fabricant Gennum 
Logo Gennum 





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GS4901B fiche technique
GS4901B/GS4900B SD Clock and Timing Generator with GENLOCK
Key Features
Video Clock Synthesis
• Pre-programmed for 4 video clock periods (14.32 MHz, 27
MHz, 36 MHz, and 54 MHz)
• Accuracy of free-running clock frequency limited only by
crystal reference
• One differential and two single-ended video clock outputs
• Each clock may be individually delayed for skew control
• Video output clock may be directly connected to Gennum’s
serializers for a SMPTE-compliant SDI output
Audio Clock Synthesis (GS4901B only)
• Three audio clock outputs
• Generates any audio clock up to 512*96kHz
• Pre-programmed for 7 audio clocks
Timing Generation
• Generates up to 8 timing signals at a time
• Choose from 9 pre-programmed timing signals: H and V sync
and blanking, F Sync, F Digital, AFS (GS4901B only), Display
Enable, 10FID, and up to 4 user-defined timing signals
• Pre-programmed to generate timing for 9 different video
formats
Genlock Capability
• Clocks may be free-running or genlocked to an input
reference with a variable offset step size of 100-200ps
(depending on exact clock frequency)
• Variable timing offset step size of 100-200ps up to one frame
• Output may be cross-locked to a different input reference
• Freeze operation on loss of reference
• Optional crash or drift lock on application of reference
• Automatic input format detection
General Features
• Reduces design complexity and saves board space - 9mm x
9mm package plus crystal reference replaces multiple
VCXOs, PLLs and timing generators
• Pb-free and RoHS Compliant
• Low power operation typically 300mW
• 1.8V core and 1.8V or 3.3V I/O power supplies
• 64-PIN QFN package
Applications
• Video cameras; Digital audio and/or video recording/play
back devices; Digital audio and/or video processing devices;
Computer/video displays; DVD/MPEG devices; Digital Set
top boxes; Video projectors; High definition video systems;
Multi-media PC applications
Description
The GS4901B is a highly flexible, digitally controlled clock
synthesis circuit and timing generator with genlock
capability. It can be used to generate video and audio
clocks and timing signals, and allows multiple devices to be
genlocked to an input reference.
The GS4900B includes all the features of the GS4901B, but
does not offer audio clocks or AFS pulse generation.
The GS4901B/GS4900B will recognize input reference
signals conforming to 36 different video standards, and will
genlock the output timing information to the incoming
reference. The GS4901B/GS4900B supports cross-locking,
allowing the output to be genlocked to an incoming
reference that is different from the output video standard
selected.
The user may select to output one of 4 different video
sample clock rates. The chosen clock frequency can be
further divided using internal dividers, and is available on
two video clock outputs and one LVDS video clock output
pair. The video clocks are frequency and phased-locked to
the horizontal timing reference, and can be individually
delayed with respect to the timing outputs for clock skew
control.
Eight user-selectable timing outputs are provided that can
automatically produce the following timing signals for 9
different video formats: HSync, Hblanking, VSync,
Vblanking, F sync, F digital, AFS (GS4901B only), DE, and
10FID. These timing outputs may be locked to the input
reference signal for genlock timing and may be phase
adjusted via internal registers.
In addition, the GS4901B provides three audio sample
clock outputs that can produce audio clocks up to 512fs
with fs ranging from 9.7kHz to 96kHz. Audio to video
phasing is accomplished by an external 10FID input
reference, a 10FID signal specified via internal registers, or
a user-programmed audio frame sequence.
The GS4901B/GS4900B is Pb-free, and the encapsulation
compound does not contain halogenated flame retardant
(RoHS Compliant).
GS4901B/GS4900B SD Clock and Timing Generator
with GENLOCK
Data Sheet
37703 - 4
December 2009
www.gennum.com
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