User's Manual

LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information Design-In
Page 83 of 116
 The high-power audio outputs lines on the application board must be wide enough to minimize series
resistance.
 Ensure proper grounding.
 Consider “No-routing” areas for the Data Module footprint.
 Optimize placement for minimum length of RF line and closer path from DC source for VCC.
 Design USB_D+ / USB_D- connection as 90  differential pair.
 Keep routing short and minimize parasitic capacitance on the SPI lines to preserve signal integrity.
2.1.3 Antenna checklist
 Antenna should have 50  impedance, V.S.W.R less then 3:1, recommended 2:1 on operating bands in
deployment geographical area.
 Follow the recommendations of the antenna producer for correct antenna installation and deployment
(PCB layout and matching circuitry).
 Antenna should have built in DC resistor to ground to get proper Antenna detection functionality.