GX4002 Datasheet, PDF (54/74 Pages) Gennum Corporation – Dynamic on-chip power management control

For improved isolation between the Ch0 and Ch1 paths, and to achieve the best Ch1
Sensitivity and Ch0 Jitter Generation, a supply filter such as the one shown in Figure 4-2
is recommended.
V3.3
L9
C21
L9: Ferrite Bead (0603)
1k, Rdc = 0.35Ω
1µF
Example: Murata
P/N BLM18HE102SN1
L10
L10: Ferrite Bead (0603) ^C23
1k, Rdc = 0.35Ω
1µF
Example: Murata
P/N BLM18HE102SN1
L11
L11: Ferrite Bead (0603) ^C25
1k, RDC = 0.35Ω
1µF
Example: Murata
P/N BLM18HE102SN1
Ch0SDOVCC
C22
100nF
Ch0VCC
C24
100nF
Ch1VCC
C26
100nF
Figure 4-2: Power Supply Filter Recommendations
4.2 Power Supply Domains
Figure 4-3 shows the power supply domains for the GX4002:
Power Domains
Supply
Sensor
Diagnostics
(ADC, Ch0Fault)
1.8V
Regulator
Digital I/Os
Host I/F
Trace Driver
O/P Stage
Pre-Driver
Reg
VCO
Ch0 CDR
Ch0EQ
Legend
Ch0SDOVCC
Ch0VCC
Ch1VCC
PRBS Generator
+ Checker
Ch1 LA
VCO
Reg
Ch1 CDR
Ch1VCOFILT
Figure 4-3: Power Supply Domains
Trace Driver
GX4002 2x2 14.025Gb/s Crosspoint Switch with Trace
Equalization and Output De-Emphasis
Data Sheet
55972 - 0
March 2012
54 of 74
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