CDB42528 Cirrus Logic Inc, CDB42528 Datasheet - Page 28

• Manufacturer Part Number: CDB42528
• Description: BOARD EVAL FOR CS42528/CS49300
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42528

• Main Purpose: Audio, Audio Processing
• Embedded: Yes, DSP
• Utilized Ic / Part: CS49300, CS42528
• Primary Attributes: 8 Single-Ended Analog Inputs and Outputs, 4 S/PDIF Inputs and 2 S/PDIF Outputs
• Secondary Attributes: Parallel, RS422, RS232, UDSP Interfaces
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1503

Due to the internal, multiplexed design of the pins,
certain signals may or may not require termination
depending on the mode being used. If a parallel
host communication mode is not being used,
GPIO[11:0] must be terminated or driven as these
pins will come up as high impedance inputs and
will be prone to oscillation if they are left floating.
The specific termination requirements may vary
since the state of some of the GPIO pins will
determine the communication mode at the rising
edge of reset (please see
page 36
termination requirements of each communication
mode please see the typical connection diagrams.
Generally a 4.7k Ohm resistor is recommended for
open drain pins. The communication mode setting
pins (please see
for more information) should also be terminated
with a 4.7k resistor. A 10k Ohm resistor is sufficient
for the GPIO pins and unused inputs.
28
for more information). For the explicit
Section 6, “Control” on page 36
Section 6, “Control” on
3.3. Phase Locked Loop Filter
The internal phase locked loop (PLL) of the
CS493XX requires an external filter for successful
operation. The topology of this filter is shown in the
typical connection diagrams. The component
values are shown below. Care should be taken
when laying out the filter circuitry to minimize trace
lengths and to avoid any close routing of high
frequency signals. Any noise coupled on to the
filter circuit will be directly coupled into the PLL,
which could affect performance.
C1
C2
C3
R1
Reference Designator
Table 1. PLL Filter Component Values
CS49300 Family DSP
200k Ohm
220pF
Value
2.2uF
10nF
DS339F7