GX3146 Datasheet, PDF (18/46 Pages) Semtech Corporation – Crosspoint Switch with Trace Equalization and Output De-emphasis

If the internal temperature ADCs, pattern generators, and
checkers are used, these connections are required.
VCC_VCO_DIGITAL
VCC_25_VCO0
VCC_25_VCO1
VCC_25_VCO2
VCC_25_A
267Ω
10nF 1µF 10µF
If the internal temperature ADCs, pattern generators, and
checkers are not used, only these connections are required.
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 3-3: 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
GX3146 146 x 146 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-056075 March 2013
www.semtech.com
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