Ac_Sdout/Ac_Sync/Ac_Bitclk/Ac_Rst# Topology#1; Bitclk/Ac_Rst# Topology #1; Ac_Sdout/Ac_Sync/Ac_Bitclk/Ac_Rst# Topology#2 - Advantech SOM-5780 Design Manual

Carrier board
SOM-Express
L1
Figure 5-17 Azalia – AC_SDOUT/AC_SYNC/AC_BITCLK/AC_RST# Topology#1
Table 5.12 Azalia – AC_SDOUT/AC_SYNC/AC_ BITCLK/AC_RST# Topology #1
Trace Azalia Requirements
Impedance
55 Ω 4 on 7 (stripline)
+/- 15%
5 on 7 (microstrip)
Carrier board
L2
SOM-Express
L1
Figure 5-18 Azalia – AC_SDOUT/AC_SYNC/AC_BITCLK/AC_RST# Topology#2
Advantech SOM-Express Design Guide
R1
L2
L2
R2
L2
L2
R3
L3
R1
L2 L8 L2
R4 R2
L2
L4
R3
Chapter 5 Carrier Board Design Guidelines
L3 Audio Codec
(down)
L3 L4
MDC
L5 L6
Dock
Trace Series
length Termination
Resistance
L1= 1" – 11" R1= 33 Ω+/- 5%
L2= 0.5" R2= 39 Ω+/- 5%
L3= 1" – 15" R3= 39 Ω+/- 5%
L4= 1.5"
L5≤0.5"
L6= 5"
Audio Codec
(down)
L4 L5
MDC
L6 L7
Dock
Modem
Codec
Audio
Codec
Signal
Length
Matching
N/A
Modem
Codec
Audio
Codec
55