Cirrus-logic CRD44800-ST-FB Manuel d'utilisateur

1Copyright Cirrus Logic, Inc. 2004(All Rights Reserved)Cirrus Logic, Inc.www.cirrus.comCRD44800-ST-FB60 W Full-Bridge Reference Design for the CS448

CRD44800-ST-FB102.3 Electromagnetic Interference (EMI)The EMI challenges that face a maker of Class-D amplifiers are largely the same challengesthat h

CRD44800-ST-FB11It is extremely critical that the layout of the power amplifier section of the Cirrus LogicCS44800 Reference Design be copied as exact

CRD44800-ST-FB123. SCHEMATICS Figure 4. Power and Connectors

CRD44800-ST-FB13Figure 5. CS44800

CRD44800-ST-FB14 Figure 6. Left/Right Back Surround Channels

CRD44800-ST-FB15Figure 7. Left/Right Surround Channels

CRD44800-ST-FB16 Figure 8. LFE/Center Channels

CRD44800-ST-FB17 Figure 9. Left/Right Channels

CRD44800-ST-FB18Figure 10. PSR Feedback

CRD44800-ST-FB194. LAYOUTFigure 11. Silk Screen Top

CRD44800-ST-FB2TABLE OF CONTENTS1. SCHEMATIC DESCRIPTIONS ...

CRD44800-ST-FB20Figure 12. Topside Layer

CRD44800-ST-FB21Figure 13. Bottomside Layer

CRD44800-ST-FB225. BILL OF MATERIALS Line ItemCirrus P/N Rev Description Qty U/M Reference Designator MFG MFG. P/N1 001-01790-01 A CAP 1000pF ±10

CRD44800-ST-FB23Line ItemCirrus P/N Rev Description Qty U/M Reference Designator MFG MFG. P/N32 021-00358-01 A RES 6.2 OHM 1/8W ±5% 0805 FILM

CRD44800-ST-FB246. TYPICAL PERFORMANCE PLOTS -5+1-4.5-4-3.5-3-2.5-2-1.5-1-0.5-0+0.5dBr A20 20k50 100 200 500 1k 2k 5k 10kHzFigure 16. Fre

CRD44800-ST-FB250.00110.0020.0050.010.020.050.10.20.5%20 20k50 100 200 500 1k 2k 5k 10kHz20 W10 W1 WFigure 17. THD+N vs. Frequency at 1 W, 10 W, and

CRD44800-ST-FB260.01100.020.050.10.20.5125%100m 80200m 500m 1 2 5 10 20 50WFigure 18. THD+N vs. Power at 1 kHz

CRD44800-ST-FB27-140+0-130-120-110-100-90-80-70-60-50-40-30-20-10dBr A20 20k50 100 200 500 1k 2k 5k 10kHzFigure 19. FFT at -60 dBFS and 1 kHz

CRD44800-ST-FB287. REVISION HISTORY Release Date ChangesRD1 December 2004 1st ReleaseTable 1. Revision HistoryContacting Cirrus Logic SupportFor

CRD44800-ST-FB31. SCHEMATIC DESCRIPTIONS 1.1 CRD44800-ST-FB PWM AmplifierThe CS44800 shown in Figure 2 employs a built-in Sample Rate Converter (SRC)

CRD44800-ST-FB42. OPERATION INFORMATIONSwitches and Indicators (Located on the Driver Board):RESET Pushbutton (S1) - forces a complete system reset.MU

CRD44800-ST-FB56) Connect loudspeakers to the speaker output terminals. The Red terminal is speaker positive,and the Black terminal is speaker negati

CRD44800-ST-FB64) Connect the DB-9 RS-232 port (J14) on the CRD44800-ST-FB Driver board to a PC serialport.5) Copy the CRD44800-ST-FB directory from t

CRD44800-ST-FB7 The Advanced Register Debug tab provides low level control over the CS44800 and CS8416 in-dividual register settings. Each device i

CRD44800-ST-FB8Figure 3. Advanced Register Debug Tab - CS44800

CRD44800-ST-FB9System Issues2.1 Power Supply RatingsThe required power supply current rating can be estimated as follows. 45 W is used as thereference