User Manual

Jennic
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Jennic
82 JN-DS-JN5139 v1.5 © Jennic 2008
B.3.15 Internal Regulator Smoothing Capacitors
A ceramic 100-nF capacitor should be connected to each of the following pins. Place these capacitors close to the
device and make the tracks as thick as possible to improve RF bypass/decoupling. Some pins require an additional
47-pF capacitor. Details are given below.
Pin Name 47-pF Capacitor Required
VB_DIG1
VB_SYN

VB_VCO
VB_RF

VB_A
VB_DIG2
VB_MEM
B.3.16 VREF
A ceramic 100-nF capacitor should be placed as close as possible to the VREF pin.
B.3.17 IBIAS
A 43-kΩ resistor should be connected as close as possible to the IBIAS pin.
B.3.18 EMC
For good EMC performance, it is necessary to minimise any ground loops when laying out the PCB.