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GS2988 데이터시트(PDF) 9 Page - Gennum Corporation

부품명 GS2988
상세설명  Dual-Slew-Rate, Cable Driver with 3Gb/s Capability
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제조업체  GENNUM [Gennum Corporation]
홈페이지  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS2988 데이터시트(HTML) 9 Page - Gennum Corporation

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GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s
Capability
Data Sheet
52131 - 4
December 2010
9 of 17
4. Detailed Description
4.1 Serial Data Input
The GS2988 features a differential input buffer with on-chip 100Ω differential
termination.
The serial data input signal is connected to the DDI and DDI input pins of the device.
Input signals can be single-ended or differential, DC or AC-coupled.
The serial data input buffer is capable of operation with any binary coded signal that
meets the input signal level requirements, in the range of 270Mb/s to at least 2.97Gb/s.
The input circuit is self-biasing to allow for simple AC or DC-coupling of input signals to
the device.
4.2 Input Trace-equalization
The GS2988 features fixed trace-equalization to compensate for PCB trace dielectric
losses.
NOTE:
This feature is not available in SD mode, and therefore trace-equalization must
be disabled when operating in this mode.
The trace-equalization has two settings, OFF and ON. ON invokes a typical 3dB gain
value at 1.5GHz. This value is optimized for compensating the high-frequency losses
associated with approximately 10 inches of 5-mil stripline in FR4 material.
4.3 Serial Data Output
The GS2988 features a current-mode differential output driver capable of driving up to
1800mVpp single-ended into a 1m length of 75Ω cable terminated at both ends.
The output signal amplitude or swing is user configurable using an external RSET
resistor.
The SDO/SDO pin of the device provide the serial data outputs.
4.3.1 Slew Rate Selection (Rise/Fall Time Requirement)
The GS2988 supports two user-selectable output slew rates.
Control of the slew rate is determined by the setting of the SD/HD input pin.
Table 4-1: Input Trace-Equalization
EQ_EN
Function
0
Typical 3dB Trace Equalization
1Trace Equalization OFF
Floating
Trace Equalization OFF


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