SNLA371B December   2020  – February 2024 DP83TG720R-Q1 , DP83TG720S-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Hardware Configuration
    1. 2.1 Schematic
  6. 3 Software Configuration
  7. 4 Testing PMA
    1. 4.1 PMA Testing Procedure
  8. 5 Testing IOP: Link-up and Link-down
    1. 5.1 IOP Testing Procedure
  9. 6 Testing SQI
    1. 6.1 SQI Testing Procedure
    2. 6.2 Mapping SQI with Link Quality
  10. 7 Testing TDR
    1. 7.1 TDR Testing Procedure
  11. 8 Testing EMC/EMI
  12. 10Revision History

2.1 Schematic

Schematics and right components for MDI, reference clock, and power network are very critical for the performance of 1000BT1 PHY. This section captures the recommended schematics and component values used during OA TC12 testing.

GUID-B85A6067-9235-43AA-9A40-8F2838079AE8-low.gif Figure 2-1 Power Supply Network: For applications with sleep mode requirement
GUID-E868E084-0A85-4899-AB08-F70B0D26700F-low.gif Figure 2-2 Power Supply Network: For applications without sleep mode requirement
GUID-01F3E37F-325F-41C0-9D20-69432A6C1BB0-low.gif Figure 2-3 MDI and Crystal Schematic
Table 2-1 Parameters, Components, and Values
Parameter/Component Value
VDDIO 1.8 V, 2.5 V, or 3.3 V
De-Coupling Capacitors VDDIO (pin 34) 10 nF, 100 nF
De-Coupling Capacitors VDDIO (pin 22) 10 nF, 100 nF, 2.2uF
Combined Ferrite Bead for VDDIO BLM18HE102SN1
VDDA 3.3 V
De-Coupling Capacitors VDDA (pin 11) 10 nF, 100 nF, 2.2uF
Ferrite Bead for VDDA BLM18KG601SH1
VDD1p0 1 V or 1.05 V (to take care of IR drop)
De-Coupling Capacitors VDD1P0 (pin 9) 10 nF, 100 nF, 2.2uF
De-Coupling Capacitors VDDA (pin 21) 10 nF, 100 nF, 2.2uF
Combined Ferrite Bead for VDD1P0 BLM18KG601SH1
Vsleep 3.3 V
DC Blocking Capacitors (1% accurate, 100V) 0.1 μF
Common-Mode Choke

Murata: DLW32MH101XT2
Common Mode Termination Resistors (1% accurate,0.75 W, Size: 2010) 1 kΩ
MDI Coupling Capacitor 4.7 nF
ESD Shunt (5% accurate, 0.125 W, Size: 0805 100 kΩ
Isolation Resistor 1 (0.25 W, Size: 1206) 0 Ω
Isolation Resistor 2 (0.25 W, Size: 1206) 0 Ω
Isolation Capacitor Not populated
R_XI 100 Ω
R_XO Minimum required for crystal wattage spec