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The GS9025A provides automatic cable equalization and high performance clock and data recovery for serial digital signals. The GS9025A receives either single-ended or differential serial digital data and outputs differential clock and retimed data signals at PECL levels (800mV). The on-board cable equalizer provides up to 40dB of gain at 200MHz which typically results in equalization of greater than 350m of high quality cable at 270Mb/s.
The GS9025A operates in either auto or manual data rate selection mode. In both modes, the GS9025A requires only one external resistor to set the VCO centre frequency and provides adjustment free operation.
The GS9025A has dedicated pins to indicate signal strength/carrier detect, LOCK and data rate. Optional external resistors allow the carrier detect threshold level to be customized to the user's requirement. In addition, the GS9025A provides an 'Output Eye Monitor Test'(OEM_TEST) for diagnostic testing of signal integrity after equalization, prior to reslicing. The serial clock outputs can also be disabled to reduce power. The GS9025A operates from a single +5 or -5 volt supply.
GS9025A Maximum Ratings
PARAMETER
VALUE
Supply Voltage (VS)
5.5V
Input Voltage Range (any input)
VCC + 0.5 to VEE - 0.5V
Operating Temperature Range
0°C TA 70°C
Storage Temperature Range
-65°C T 150°C
Lead Temperature (soldering, 10 sec)
260°C
GS9025A Features
• SMPTE 259M compliant • operational to 540Mb/s • automatic cable equalization (typically greater than 350m of high quality cable at 270Mb/s) • adjustment-free operation • auto-rate selection (5 rates) with manual override • single external VCO resistor for operation with five input data rates • data rate indication output • 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)
GS9025A Typical Application
Cable equalization plus clock and data recovery for all high speed serial digital interface applications involving SMPTE 259M and other data standards.
GS9025A Connection Diagram
GS9028 General Description
The GS9028 is a second generation bipolar integrated circuit designed to drive two 75ohm co-axial cables.
The GS9028 features two complementary outputs whose amplitude is controlled within ± 7%. The output signal levels are also adjustable from as low as 50mV to as high as 1000mV with little change in other performance parameters. The output amplitude of the output stage is varied by adjusting the RSET resistor value.
The GS9028 consumes 45% less system power than the GS9008 and does not require external pulldown resistors resulting in a smaller PCB footprint. Operational with input amplitudes as low as 80mV, the GS9028 is a robust serial interface device.
The GS9028 is packaged in an 8 pin SOIC and operates from a single +5 or -5 volt supply.
GS9028 Maximum Ratings
PARAMETER
VALUE
Supply Voltage
5.5V
Input Voltage Range (any input)
-0.3 to (VCC +0.3)V
Operating Temperature Range
0 to 70°C
Storage Temperature Range
-65 to 150°C
Lead Temperature (soldering, 10 sec)
260°C
GS9028 Features
• SMPTE 259M compliant • two complementary outputs, adjustable from 50 to 1000mVp-p into 75Ω loads • operational from DC to 622Mb/s • nominal 470ps rise and fall times • < ±7% output amplitude control • 45% system power reduction over the GS9008 • no external pulldown resistors required • input hysteresis • operational down to 80mV input amplitude • operates from a single +5 or -5 volt supply • 8 pin SOIC
GS9028 Typical Application
4ƒsc, 4:2:2, and 4:4:4:4 serial digital video interfaces from 143Mb/s to 540Mb/s; general purpose high speed cable driver applications.