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GS2984 Datasheet, PDF (7/20 Pages) Gennum Corporation – GS2984 Adaptive Cable Equalizer | |||
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2.3 AC Electrical Characteristics
Table 2-2: AC Electrical Characteristics
VCC = 3.3V ±5%, TA = -20°C to +85°C, unless otherwise shown
Parameter
Symbol Conditions
Min
Typ
Max
Units Notes
Serial input data rate
DRSDO
â
143
â
2970
Mb/s
â
Input Voltage Swing
ÎVSDI
TA =25°C, differential,
720
800
950
mVp-p
1
270Mb/s and 1.485Gb/s
TA =25°C, differential,
2.97Gb/s
720
800
880
mVp-p
1
Output Voltage Swing
ÎVSDO
100Ω load, TA =25°C,
differential
680
800
900
mVp-p
â
Output Jitter of Various
Cable Lengths and Data
Rates
â
2.97Gb/s
â
Belden 1694A: 0-120m
â
2.97Gb/s
â
Belden 1694A: 120-140m
â
0.25
UI
2, 5
0.3
â
UI
3, 5
â
1.485Gb/s
â
Belden 1694A: 0-160m
â
0.25
UI
2, 5
â
1.485Gb/s
â
0.2
â
UI
3, 5
Belden 1694A: 160-200m
â
270Mb/s
â
Belden 1694A: 0-400m
â
0.2
UI
2, 5
Output Rise/Fall time
â
2.97Gb/s & 1.485Gb/s
20% - 80%
35
65
90
ps
â
â
270Mb/s (see Section 4.8)
Mismatch in rise/fall time
â
â
â
â
30
ps
â
Duty cycle distortion
â
â
â
â
30
ps
â
Overshoot
â
â
â
â
10
%
â
Input Return Loss
â
â
15
21
â
dB
4
Input Resistance
â
single ended
â
1.9
â
kΩ
â
Input Capacitance
â
single ended
â
1.3
â
pF
â
Output Resistance
â
single ended
â
50
â
Ω
â
NOTES:
1. 0m cable length.
2. All parts are production tested. In order to guarantee jitter over the full range of specification (VCC = 3.3V ±5%, TA = -20°C to +85°C, and
720-880mV launch swing from the SDI cable driver) the recommended applications circuit must be used.
3. Based on characterization data using the recommended applications circuit, at VCC = 3.3V, TA = 25°C and 800mV launch swing from the SDI
cable driver.
4. Tested on a 2984 board from 5MHz to 3GHz.
5. CM_SET = 0, GAIN_SEL = 0
GS2984 Adaptive Cable Equalizer
Data Sheet
50985 - 3
March 2010
7 of 20
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