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PDF GS3490 Data sheet ( Hoja de datos )
| Número de pieza | GS3490 | |
| Descripción | Configurable Adaptive Cable Equalizer/Cable Driver | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Gennum Products
GS3490
Configurable Adaptive Cable
Equalizer/Cable Driver
Key Features
• Connection to a single BNC connector as an adaptive
cable equalizer or cable driver
• Performance and cable reach optimized for
SMPTE ST 424, SMPTE ST 292, and SMPTE ST 259 data
rates
• Multi-rate operation from 125Mb/s to 2.97Gb/s in
Equalizer Mode and 270Mb/s to 2.97Gb/s in
Cable Driver Mode
• Supports DVB-ASI at 270Mb/s
• Integrated 100Ω, differential digital data input/output
termination
• Low power operation from a single 3.3V supply:
206mW typical power consumption in EQ mode
190mW typical power consumption in CD mode
• Temperature range: -40°C to +85°C
• 32-pin 5mm x 5mm QFN package
Description
The GS3490 features integrated adaptive cable equalizer
and cable driver functionality. The GS3490 can be
field-configured as a SMPTE compliant cable equalizer or a
SMPTE compliant cable driver.
The GS3490 is optimized for applications with limited I/O
space. With its configurable EQ and cable driver
functionality, the GS3490 can be utilized as a single-device
solution in applications where the interface connector can
be configured as either an input or output.
The GS3490's cable equalizer is optimized for operation at
2.97Gb/s, 1.485Gb/s and 270Mb/s while providing typical
cable reach of 140m at 2.97Gb/s, 260m at 1.485Gb/s and
500m at 270Mb/s.
In cable driver mode, the dual slew rate capability provides
compatibility to SMPTE ST 424, SMPTE ST 292 and
SMPTE ST 259 interfaces.
Cable Equalizer Features
• Integrated cable equalizer:
140m - 3G
260m - HD
500m - SD
• Carrier detect with adjustable squelch threshold
• Optional automatic power-down on loss of input
signal
SDI/SDO
DDI
CD
DDI
DDO
EQ DDO
CD
Cable Driver Features
• Selectable output slew rate cable driver for compliance
with SMPTE ST 424, SMPTE ST 292, and SMPTE ST 259
standards
Applications
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
interfaces requiring switching between cable
equalizing or cable driving functionality
GS3490 Block Diagram
GS3490
Final Data Sheet
GENDOC-058568
Rev. 1
April 2014
www.semtech.com
1 of 22
Proprietary & Confidential
1 page  
Table 1-1: GS3490 Pin Descriptions (Continued)
Pin Number
Name
Type
29
CD_ENABLE
Input
30 CD Output
—
Center Pad
Power
Description
Cable Driver Mode Enable Control.
Please refer to the input logic parameter in Table 2-2 for
logic level threshold and compatibility.
For details on operation, refer to Section 4.2.1.
When left unconnected, the default state of this pin is logic
LOW.
Equalizer Carrier Detect Status Output.
Please refer to the output logic parameter in Table 2-2 for
logic level threshold and compatibility.
For details on operation, refer to Section 4.1.4.
Internally bonded to VEE.
For more details, refer to Section 6.3.
GS3490
Final Data Sheet
GENDOC-058568
Rev. 1
April 2014
www.semtech.com
5 of 22
Proprietary & Confidential
5 Page 
VCC
EQ_DISABLE,
EQ_BYPASS,
EQ_GAIN_SEL
100kΩ
Figure 3-4: EQ_DISABLE, EQ_BYPASS,
EQ_GAIN_SEL Circuits
Internal
2.5V
CD
Figure 3-5: CD Circuit
VCC VCC
VCC
EQ_OP_CTL
1MΩ
Internal Circuitry
Internal Reference
Internal Reference
DDI
EQ RC*
DDI
VCC
50Ω
5kΩ
50Ω
700pF
10kΩ
*RC Network
for Trace Equalization
Figure 3-6: EQ_OP_CTL Circuit
Figure 3-7: Cable Driver Differential Digital Data Input
Circuit
GS3490
Final Data Sheet
GENDOC-058568
Rev. 1
April 2014
www.semtech.com
11 of 22
Proprietary & Confidential
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet GS3490.PDF ] | |
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