Nvidia Jetson TX2 Manual page 60

DMIC Design Guidelines
Table 63. DMIC Interface Signal Routing Requirements
Parameter
Clock Frequency/Period
Data Bit-rate/Period (DDR24)
Configuration / Device Organization
Topology
Reference plane
Trace Impedance
Via proximity (Signal via to GND return via)
Trace spacing
Max Trace Delay
Max Trace Delay Skew between CLK & DAT
Notes: Up to 4 signal Vias can share a single GND return Via
Table 64. DMIC Signal Connections
Function Name Type
AO_DMIC_IN_CLK O
AO_DMIC_IN_DAT I
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
Requirement
12/83.33
24/41.66
1
Point to Point
GND
45-50
< 3.8 (24)
Microstrip / Stripline 2x / 2x
1280
150
Termination Description
Digital Microphone Clock: Connect to clock pin of DMIC device
Digital Microphone Data: Connect to data pin of DMIC device
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
Units Notes
MHz/ns
Mbps/ns
load
Ω ±20%
mm (ps) See Note
dielectric
ps
ps
60