CRD44800-ST-FB Datasheet | Cirrus Logic

Features Eight full-bridge channels, 60 W each Programmable load pensation Power Supply Rejection (PSR) feedback allowing amplifier to operate from low cost linear unregulated power supplies Peak signal limiting Thermal and over-current protection > 85% amplifier efficiency Works with GUI to configure the board or in a standalone mode for easy operation. Demonstrates remended layout and grounding arrangements 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 digital audio inputs in I²S format and converts them to PWM outputs. This 64-pin LQFP IC provides an integrated sample rate converter for 32 k Hz-192 k Hz input sample rate support, volume up/down, speaker load pensation, peak limiting to prevent amplifier clipping, power supply ripple pensation, and AM frequency interference elimination. This reference design uses the the ST Micro STA500, an integrated power stage back end for digital amplifiers (four STA500 parts configured as full-bridges are used for this eight-channel design). Current limiting and thermal protection are provided by the STA500. The inductor/capacitor 2nd order low pass filter (LPF) removes high frequency ponents from the output signal effectively converting it from digital to analog. ORDERING INFORMATION CRD44800-ST-FB Reference Design Description The CRD44800-ST-FB PWM Amplifier demonstrates the CS44800, Cirrus’ eight-channel pure digital PMW controller. This reference design implements an eightchannel amplifier which delivers 60 W per full-bridge channel into 8 Ω loads using a single +30 V supply (at +30V PSR Circuitry 155W Switched Mode Power Supply +30V/+5V CS4461 ADC +30V PWM Outputs LPF ST Micro STA500A LPF 8Ω 8Ω I2S Clocks & Data Audio Driver Board I2C Host Control CS44800 (PWM Controller) To channels 3/4 To channels 5/6 To channels 7/8 Channels 1 and 2 (of 8) Cirrus Logic, Inc. .cirrus. Copyright © Cirrus Logic, Inc. 2004 (All...