GX3290 Datasheet, PDF (18/47 Pages) Semtech Corporation – 290 x 290 3.5Gb/s Crosspoint Switch

VCC_25_A
VCC_25_A
ext_ref_clk
50Ω
50Ω
ext_ref_clk
Figure 3-3: External Clock Input Equivalent Circuit
If the internal temperature ADCs, pattern generators, and
checkers are used, these connections are required.
If the internal temperature ADCs, pattern generators, and
checkers are not used, only these connections are required.
VCC_VCO_DIGITAL
VCC_25_VCO0
VCC_25_VCO1
VCC_25_VCO2
VCC_25_A
267Ω
10nF 1µF 10µF
VCC_VCO_DIGITAL
VCC_25_A
267Ω
10nF 1µF
10µF
VCC_25_VCO0
VCC_25_VCO1
VCC_25_VCO2
LF0
LF1
47nF
LDO_DIGITAL
LDO0
LDO1
LDO2
LF_DIGITAL
LF2
220nF
47nF
0Ω
LF_DIGITAL
47nF
0Ω
LDO_DIGITAL
220nF
LF0
LF1
LF2
LDO0
LDO1
LDO2
220nF
Note 1: Each of the VCC_VCO_DIGITAL, VCC_VCO0, VCC_VCO1, and VCC_VCO2 pins require an independent RC network.
Note 2: The LF_DIGITAL and LF2 pins each require an independent RC network.
Note 3: The LF0 and LF1 pins each require an independent capacitor to ground.
Note 4: Each of the LDO_DIGITAL, LDO0, LDO1, and LDO2 pins require an independent capacitor to ground.
Note 5: VCC_VCO_DIGITAL, LF_DIGITAL and LDO_DIGITAL used for pattern generator TX0, digital communication (GSPI and APPI), and the internal
temperature ADC for JNCTN_TEMP_1. VCC_VCO_DIGITAL, LF_DIGITAL and LDO_DIGITAL must always be connected.
Note 6: VCC_25_VCO0, LF0, LDO0 used for pattern checker RX0 and the internal temperature ADC for JNCTN_TEMP_0.
If VCC_25_VCO0, LF0, and LDO0 are not connected, pattern checker RX0 and the internal temperature ADC for JNCTN_TEMP_0 will not operate.
Note 7: VCC_25_VCO1, LF1, LDO1 used for pattern checker RX1 and the internal temperature ADC for JNCTN_TEMP_2.
If VCC_25_VCO1, LF1, and LDO1 are not connected, pattern checker RX1 and the internal temperature ADC for JNCTN_TEMP_2 will not operate.
Note 8: VCC_25_VCO2, LF2, LDO2 used for pattern generator TX1 and the internal temperature ADC for JNCTN_TEMP_3.
If VCC_25_VCO2, LF2, and LDO2 are not connected, pattern generator TX1 and the internal temperature ADC for JNCTN_TEMP_3 will not operate.
Figure 3-4: Required connections for VCC_VCO_DIGITAL, VCC_25_VCO0, VCC_25_VCO1, VCC_25_VCO2,
LF_DIGITAL, LF0, LF1, LF2, LDO_DIGITAL, LDO0, LDO1 and LDO2
GX3290 290 x 290 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-053317 March 2013
www.semtech.com
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