CRD-4525-D1 Cirrus Logic Inc, CRD-4525-D1 Datasheet - Page 31

• Manufacturer Part Number: CRD-4525-D1
• Description: Audio Modules & Development Tools Eval Bd PWM Contrlr+ PwrStg_4Lyr 1oz Cu
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-4525-D1

• Description/function: Audio Amplifiers
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS804RD4
10.2
10.3
70.0
60.0
50.0
40.0
30.0
20.0
10.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
System Configuration
The source signal for EMC testing was a 1 kHz test tone generated by a battery-operated portable CD play-
er. The CS4525 was driven at 1/8th of its rated power into two 8 Ω resistive loads connected to the
CRD4525-Q1's output connectors through 3 meters of standard speaker wire. The CRD4525-Q1 was pow-
ered by a Mean Well U65S107-P2J 18 V power supply.
CRD4525-Q1 Test Results
Upon quasi-peak analysis of the peak scan data for all modes of operation, it has been confirmed that the
CRD4525-Q1 complies with both the FCC Class B Part 15 and CISPR 22 EMC standards for radiated emis-
sions. The peak scans for the "Optical S/PDIF In" mode of operation can be seen in
Figure
to J7. It should be noted that an open frame PCB, such as the CRD4525-Q1, represents the worst case
scenario for EMC testing. Systems which include a shielded chassis and an earth ground will produce lower
levels of EMI, given the same schematic and layout configuration as that of the CRD4525-Q1. A full com-
pliance report is available upon request.
0
10.0M
0
10.0M
23. In this mode of operation, the 1 kHz test tone is supplied through an optical S/PDIF signal applied
Figure 23. Horizontal Peak Scan Data for the CRD4525-Q1
Figure 22. Vertical Peak Scan Data for the CRD4525-Q1
Frequency (Hz)
Frequency (Hz)
100.0M
100.0M
CRD4525-Q1
Vertical Data
Limit B
1.0G
Horizontal Data
Limit B
1.0G
Figure 22
and
31