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1/4 Structure Product name Type Applications Functions Silicon Monolithic integrated circuit USB host MP3 Decoder LSI BU9457KV Audio products, etc. BU9457KV is MP3 decoder IC which contains USB host and SD card I/F, audio DAC, system controller, regulator for internal CORE power supply.
USB2.0 Full Speed host I/F function contained. SD card I/F function contained. 2 I C I/F function contained. FAT analysis function contained. MP3 decode function contained. (available for MPEG1, 2 and 2.5, Layer 1, 2 and 3) Sample Rate Converter contained. System Controller contained. LED Controller contained. KEY matrix Controller contained. Stand Alone mode contained. External processor can control. Audio DAC contained. Sound Effect function contained. 2 Digital Audio Out(I S, S/PDIF) function contained. File Name, Folder Name Sorting. ID3TAG Analysis. Regulator for internal CORE power supply contained. VQFP64pin(0.5mm pitch)
Absolute maximum ratings (Ta = 25C) Parameter Symbol Supply voltage(Analog, I/O) VDD1MAX Input voltage Storage temperature range Operating temperature range Power dissipation *1 VIN TSTG TOPR PD
Limits -0.34.5 -0.3 VDD1 + 0.3 -55125 -4085 750
Unit
Comment DVDDIO, VDD_PLL, DAVDD, AVDDC
*1In the case of use at Ta=25 or more, 7.5mW should be reduced per 1. Radiation resistance design is not arranged.
Operating conditions
(Ta = 25) Symbol VDD1 Limits 3.03.6 Unit Comment DVDDIO,VDD_PLL, DAVDD, AVDDC
Parameter Supply voltage(Analog, I/O)
MPEG Layer-3 audio coding technology licensed from Fraunhofer IIS and Thomson. The fee related to above license and its administration costs are included in the sales price of this product.
REV. B
2/4 Electrical characteristics Unless specified, Ta=25VDD1=3.3V, DVSS=AVSSC=VSS_PLL=DAVSS=0V, XIN_PLL=16.9344MHz Limits Parameter Symbol Unit Condition MIN. TYP. MAX.
Circuit current (VDD1 USB1) Circuit current (VDD1 SD1) H-Level input voltage L-Level input voltage H-Level output voltage1 L-Level output voltage1 H-Level output voltage2 L-Level output voltage2 H-Level output voltage3 L-Level output voltage3 H-Level output voltage4 L-Level output voltage4 H-Level input voltage L-Level input voltage Output impedance(H) Output impedance(L) H-Level output voltage L-Level output voltage Rise/Fall time Voltage of crossing point Range of differential input Differential input sensitivity Pull-down resistance

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