Cirrus-logic CS42518 User Manual download pdf (Page 80)

80 DS584F2

CS42518

10.1.3 Capacitor Selection

The type of capacitors used for the PLL filter can have a significant effect on receiver performance. Large

or exotic film capacitors are not necessary because their leads, and the required longer circuit board trac-

es, add undesirable inductance to the circuit. Surface-mount ceramic capacitors are a good choice be-

cause their own inductance is low, and they can be mounted close to the LPFLT pin to minimize trace

inductance. For CRIP, a C0G or NPO dielectric is recommended; and for CFILT, an X7R dielectric is pre-

ferred. Avoid capacitors with large temperature co-coefficient, or capacitors with high dielectric constants,

that are sensitive to shock and vibration. These include the Z5U and Y5V dielectrics.

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Cirrus-logic CS42518 User Manual Page 80