GS7025_09 Datasheet, PDF (1/23 Pages) Gennum Corporation – PRO-LINX Serial Digital Receiver

GS7025 PRO-LINX™ Serial Digital Receiver
Key Features
• SMPTE 259M-C compliant (270Mb/s)
• Automatic cable equalization (typically greater than
350m of high-quality cable)
• Serial data outputs muted and serial clock remains
active when input data is lost
• Operation independent of SAV/EAV sync signals
• Signal strength indicator output
• Carrier detect with programmable threshold level
• Power savings mode (output serial clock disable)
• Large IJT, typically 0.56UI beyond loop bandwidth
• Robust lock detect
Applications
Cable equalization plus clock and data recovery for all high
speed serial digital interface applications involving SMPTE
259M-C.
Description
The GS7025 provides automatic cable equalization and
high-performance clock and data recovery for serial digital
signals. The GS7025 receives either single-ended or
differential serial digital data and outputs differential clock
and retimed data signals at PECL levels (800mV). The
onboard cable equalizer provides up to 35dB of gain at
135MHz, which typically results in equalization of greater
than 350m of high-quality cable at 270Mb/s.
The GS7025 requires only one external resistor to set the
VCO centre frequency and provides adjustment free
operation.
The GS7025 has dedicated pins to indicate signal strength,
carrier detect, and LOCK. Optional external resistors allow
the carrier detect threshold level to be customized to the
user's requirement. In addition, the GS7025 provides an
'Output Eye Monitor Test' (OEM_TEST) for diagnostic
testing of signal integrity after equalization, prior to
re-slicing. The serial clock outputs can be disabled to
reduce power. The GS7025 operates from a single +5V or
-5V supply.
A/D
DDI
ANALOG
DDI
DIGITAL
MUX
C_OSC
CARRIER DETECT
PHASELOCK
HARMONIC
LOGIC _MUTE
SDI
SDI
OEM_TEST
+
VARIABLE
GAIN EQ
-^-
STAGE
EYE
MONITOR
FREQUENCY
ACQUISITION
PHASE
DETECTOR
AUTO EQ
CONTROL
+
-
AGC CAP CD_ADJ
SSI/CD
CHARGE
PUMP
LF+ LFS LF-
VCO
CBG R_VCO
GS7025 Functional Block Diagram
GS7025 PRO-LINX™ Serial Digital Receiver
Data Sheet
13813 - 7
October 2009
www.gennum.com
LOCK
SDO
SDO
CLK_EN
SCO
SCO
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