CS8416-DZZR Cirrus Logic Inc, CS8416-DZZR Datasheet - Page 54

• Manufacturer Part Number: CS8416-DZZR
• Description: IC,Digital Audio Receiver,CMOS,TSSOP,28PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

54
18.2.2 Capacitor Selection
18.2.3 Circuit Board Layout
18.2.4 Component Value 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 as their leads and the required longer circuit board traces add
undesirable inductance to the circuit. Surface mount ceramic capacitors are a good choice because their
own inductance is low, and they can be mounted close to the FILT pin to minimize trace inductance. For
C
pacitors with large temperature co-coefficient, or capacitors with high dielectric constants, that are sensi-
tive to shock and vibration. These include the Z5U and Y5V dielectrics.
Board layout and capacitor choice affect each other and determine the performance of the PLL.
contains a suggested layout for the PLL filter components and for bypassing the analog supply voltage.
The 0.1 µF bypass capacitor is in a 1206 form factor. R
pacitor are in an 0805 form factor. The traces are on the top surface of the board with the IC so that there
is no via inductance. The traces themselves are short to minimize the inductance in the filter path. The
VA and AGND traces extend back to their origin and are shown only in truncated form in the drawing.
The external PLL component values are listed in
RIP
Range (kHz)
, a C0G or NPO dielectric is recommended, and for C
32 - 192
Figure 24. Recommended Layout Example
Table 6. External PLL Component Values
R
3 k Ω
FLT
.1µF
1000
pF
22 nF
C
FLT
C
C
Table
FLT
RIP
6.
FLT
, C
FLT
FLT
, an X7R dielectric is preferred. Avoid ca-
C
1 nF
, C
RIP
RIP
, and the 1000 pF decoupling ca-
Settling Time
4 ms
CS8416
Figure 24
DS578F3