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LM4947 データシート(PDF) 7 Page - National Semiconductor (TI) |
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LM4947 データシート(HTML) 7 Page - National Semiconductor (TI) |
7 / 32 page Electrical Characteristics 5V (Notes 2, 7) (Continued) The following specifications apply for V DD = 5V, TA = 25˚C and all gains are set for 0dB unless otherwise specified. Symbol Parameter Conditions LM4947 Units (Limits) Typical (Note 4) Limits (Note 5) PSRR Power Supply Rejection Ratio Loudspeaker out V RIPPLE = 200mVPP; f = 217Hz, R L =8 Ω,C B = 2.2µF, BTL All audio inputs terminated to GND; output referred BTL, Output Mode 1 70 dB BTL, Output Mode 3 61 dB BTL, Output Mode 5 64 dB BTL, Output Mode 7 61 dB Power Supply Rejection Ratio R OUT and LOUT V RIPPLE = 200mVPP; f = 217Hz, R L =32 Ω,C B = 2.2µF, BTL All audio inputs terminated to GND; output referred SE, Output Mode 2 72 dB SE, Output Mode 4 70 dB SE, Output Mode 6 65 dB OCL, Output Mode 2 76 dB OCL, Output Mode 4 72 dB OCL, Output Mode 6 70 dB η Class D Efficiency Output Mode 1, 3, 5 86 % CMRR Common-Mode Rejection Ratio f = 1kHz, V CM = 1Vpp, 0dB gain, Mode 1, BTL, R L =8 Ω –49 dB XTALK Crosstalk Headphone, P O = 30mW, f = 1kHz, OCL, Mode 4 –55 dB Headphone, P O = 30mW, f = 1kHz, SE, Mode 4 –72 T WU Wake-Up Time from Shutdown C B = 2.2µF, OCL, RL =32 Ω 116 ms C B = 2.2µF, SE, RL =32 Ω 150 Volume Control Step Size Error ±0.2 dB Digital Volume Range Input referred maximum attenuation -59.5 dB Input referred maximum gain +18 dB Mute Attenuation Output Mode 1, 3, 5 90 dB MONO_IN Input Impedance R IN and LIN Input Impedance Maximum gain setting 11 k Ω Maximum attenuation setting 100 k Ω www.national.com 7 |
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