GS7025 PRO-LINX™ Serial Digital Receiver
Key Features
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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
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.
Applications
Cable equalization plus clock and data recovery for all high
speed serial digital interface applications involving SMPTE
259M-C.
A/D
DDI
DDI
ANALOG
DIGITAL
MUX
CARRIER DETECT
PHASELOCK
HARMONIC
C
OSC
LOCK
LOGIC
MUTE
SDO
SDI
SDI
+
-
-
VARIABLE
GAIN EQ
STAGE
FREQUENCY
ACQUISITION
PHASE
DETECTOR
SDO
CLK_EN
SCO
SCO
OEM_TEST
EYE
MONITOR
AUTO EQ
CONTROL
CHARGE
PUMP
LF+ LFS LF-
+
-
AGC CAP CD_ADJ
SSI/CD
VCO
CBG
R
VCO
GS7025 Functional Block Diagram
GS7025 PRO-LINX™ Serial Digital Receiver
Data Sheet
13813 - 7
October 2009
1 of 23
GENNUM [ GENNUM CORPORATION ]
