CS8420-CSZ Cirrus Logic Inc, CS8420-CSZ Datasheet - Page 88

• Manufacturer Part Number: CS8420-CSZ
• Description: IC SAMPLE RATE CONVERTER 28SOIC
• Manufacturer: Cirrus Logic Inc
• Type: Sample Rate Converterr

Specifications of CS8420-CSZ

• Package / Case: 28-SOIC
• Applications: CD-R, DAT, DVD, MD, VTR
• Mounting Type: Surface Mount
• Operating Supply Voltage: 5 V
• Operating Temperature Range: - 10 C to + 70 C
• Mounting Style: SMD/SMT
• Resolution: 17 bit to 24 bit
• Control Interface: 3 Wire, Serial
• Supply Voltage Range: 4.75V To 5.25V
• Audio Ic Case Style: SOIC
• No. Of Pins: 28
• Bandwidth: 20kHz
• Rohs Compliant: Yes
• Audio Control Type: Volume
• Dc: 0841
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1782 - EVALUATION BOARD FOR CS8420
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1125-5

88
16.2.2 Capacitor Selection
16.2.3 Circuit Board Layout
16.3
16.3.1 Identifying the Part Revision
Component Value Selection
When transitioning from one revision of the part another, component values need to be changed. It is man-
datory for customers to change the external PLL component values when transitioning from revision D to
revision D1.
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 coefficients, or capacitors with high dielectric constants, that are sensitive
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. Figure
42 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
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 first line of the part marking on the package indicates the part number and package type
CS8420-xx.
which indicates what revision the part is.
Revision
RIP
D1
D
, a C0G or NPO dielectric is recommended, and for C
Table 17
shows a list of part revisions and their corresponding second line part marking,
Pre-October 2002 (10-Digit)
Figure 42. Recommended Layout Example
Table 17. Second Line Part Marking
Rxxxxxxxxx
Zxxxxxxxxx
.1µF
1000
pF
Crip
Cfilt
FILT
FILT
and the other three capacitors are in an 0805
, an X7R dielectric is preferred. Avoid ca-
ZFBADXxxxxxx
RFBAD1xxxxxx
New (12-Digit)
CS8420
DS245F4