Follow these instructions to improve the
performance and noise immunity of the LOG305:
- Design
Log_In trace with guard traces to improve immunity
against noise pickup. Use shielding when possible to
improve radiated noise immunity.
- Place
small capacitors on the Log_En pin to allow
high-frequency noise to be grounded before entering
into the device.
- Keep
minimal capacitance at the Log_Out and FB pin either
by placing the load circuit close to the pin or by
removing the analog ground plane under the output
trace or both. The Log_Out supports up to 100pF
capacitance.
- Dedicate
one layer of the PCB for a solid analog ground pour
to terminate all the capacitors used across the pins
using sufficient vias.