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CS8415A-CS Datasheet

  • CS8415A-CS

  • Cirrus Logic [96 kHz DIGITAL AUDIO INTERFACE RECEIVER]

  • 733.62KB

  • CIRRUS

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CS8415A
16.2
External Filter Components
they can be mounted close to the FILT pin to
minimize trace inductance. For C
RIP
, a C0G or
NPO dielectric is recommended, and for C
FILT
, an
X7R dielectric is preferred. Avoid capacitors with
large temperature co-efficients, or capacitors with
high dielectric constants, that are sensitive to
shock and vibration. These include the Z5U and
Y5V dielectrics.
16.2.1 General
The PLL behavior is affected by the external filter
component values. Figure 5 shows the recom-
mended configuration of the two capacitors and
one resistor that comprise the PLL filter. In Table
4, the component values shown for the 32 to
96kHz range have the highest corner frequency jit-
ter attenuation curve, takes the shortest time to
lock, and offers the best output jitter performance.
The component values shown for the 8 to 96kHz
range allows the lowest input sample rate to be 8
kHz, and increases the lock time of the PLL. Lock
times are worst case for an Fsi transition of 96 kHz.
16.2.3 Circuit Board Layout
Board layout and capacitor choice affect each
other and determine the performance of the PLL.
Figure 18 contains a suggested layout for the PLL
filter components and for bypassing the analog
supply voltage. The 0.1 碌F bypass capacitor is in a
1206 form factor. R
FILT
and the other three
capacitors 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.
16.2.2 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
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
AGND
1000
pF
Crip
Rfilt
.1碌F
Cfilt
Figure 18. Recommended Layout Example
FILT
VA+
41

CS8415A-CS PDF文件相關(guān)型號

CS8415A-CZ,CS8415A-IZ

CS8415A-CS 產(chǎn)品屬性

  • Cirrus Logic

  • 音頻 DSP

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