CRD44800-ST-FB Cirrus Logic Inc, CRD44800-ST-FB Datasheet
CRD44800-ST-FB
Specifications of CRD44800-ST-FB
Related parts for CRD44800-ST-FB
CRD44800-ST-FB Summary of contents
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... C Host Control Cirrus Logic, Inc. www.cirrus.com 10% THD+N). A 155 W Switched Mode Power Supply (SMPS) is used to power the CRD44800-ST-FB. As shown below, the CS44800 IC takes four stereo dig- ital audio inputs in I²S format and converts them to PWM outputs. This 64-pin LQFP IC provides an integrated ...
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... TABLE OF CONTENTS 1. SCHEMATIC DESCRIPTIONS ................................................................................................. 3 1.1 CRD44800-ST-FB PWM Amplifier ..................................................................................... 3 1.2 CRD44800-ST-FB Driver Board ........................................................................................ 3 1.3 Switched Mode Power Supply ........................................................................................... 3 2. OPERATION INFORMATION ................................................................................................... 4 2.1 Power Supply Ratings ........................................................................................................ 9 2.2 Power Supply Decoupling .................................................................................................. 9 2.3 Electromagnetic Interference (EMI) ................................................................................. 10 2.3.1 Suppression of EMI at the Source ...................................................................... 10 3. SCHEMATICS.......................................................................................................................... 12 4. LAYOUT................................................................................................................................... 19 5 ...
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... All aspects of the CS44800 may then be evaluated using the supplied software. 1.3 Switched Mode Power Supply The SMPS used for the CRD44800-ST- 155 W OEM supply. The supply provides +30 V for the STA500 PWM back ends, and + power all the signal level circuitry. The SMPS is fully over-current and over-temperature protected. ...
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... OPERATION INFORMATION Switches and Indicators (Located on the Driver Board): RESET Pushbutton (S1) - forces a complete system reset. MUTE Pushbutton (S2) - mutes the audio output of the CRD44800-ST-FB, but the PWM output stage will continue switching. RAMP UP/DN Pushbutton (S3) - enables/disables the PWM output stage from switching. ...
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... The Fault and Mute LEDs will both light briefly as the system is initialized. Note that if either the Coax or the Optical input is selected, a valid digital signal must be provided to the selected input so that the CRD44800-ST-FB can complete initialization valid signal is not present at the selected input, both the Fault and Mute LEDs will remain lit. ...
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... Selected Input Coaxial S/PDIF 4) Connect the DB-9 RS-232 port (J14) on the CRD44800-ST-FB Driver board serial port. 5) Copy the CRD44800-ST-FB directory from the included CD-ROM to the users local hard drive. Note that FlexGUI is only compatible with systems running Windows 98 or better (i.e. ...
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... Each device is displayed on a separate tab. Register values can be modified bitwise or bytewise. For bitwise, click the appropriate pushbutton for the desired bit. For bytewise, the desired hex value can be typed directly in the register address box in the register map. Figure 2. CS44800 Dialog Tab CRD44800-ST-FB 7 ...
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... Figure 3. Advanced Register Debug Tab - CS44800 8 CRD44800-ST-FB ...
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... While the PSR functionality of the CS44800 helps reduce power supply noise feedthrough to the output, careful decoupling of the power stage supply rails is essential. Referring to Figure 11, the top side of the CRD44800-ST-FB PWM amplifier board, good decoupling practice is shown. Notice that the 0.1 as physically possible to the power pins of the STA500 ...
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... RF decoupled to the chassis just before they exit the chassis from the speaker connector. Again, refer to Figure 11 for the preferred component lay- out. • Make use of source termination resistors on all digital signals whose traces are longer than about 25 mm. 10 CRD44800-ST-FB ...
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... It is extremely critical that the layout of the power amplifier section of the Cirrus Logic CS44800 Reference Design be copied as exactly as possible to assure best RF/EMI per- formance. CRD44800-ST-FB 11 ...
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... SCHEMATICS 12 CRD44800-ST-FB ...
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... LAYOUT CRD44800-ST-FB 19 ...
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... BILL OF MATERIALS 22 CRD44800-ST-FB ...
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... TYPICAL PERFORMANCE PLOTS 24 CRD44800-ST-FB ...
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... LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. 28 Changes 1st Release Table 1. Revision History CRD44800-ST-FB ...