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LM4947 Arkusz danych(PDF) 5 Page - National Semiconductor (TI) |
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LM4947 Arkusz danych(HTML) 5 Page - National Semiconductor (TI) |
5 / 32 page Electrical Characteristics 3.3V (Notes 2, 7) (Continued) The following specifications apply for V DD = 3.3V, 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 79 dB BTL, Output Mode 3 78 dB BTL, Output Mode 5 79 dB BTL, Output Mode 7 80 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 78 dB SE, Output Mode 4 71 dB SE, Output Mode 6 71 dB OCL, Output Mode 2 83 dB OCL, Output Mode 4 74 dB OCL, Output Mode 6 74 dB η Class D Efficiency Output Mode 1, 3, 5 86 % CMRR Common-Mode-Rejection Ratio f = 217Hz, V CM = 1Vpp, Mode 1, BTL, R L =8 Ω –49 dB XTALK Crosstalk Headphone, P O = 12mW, f = 1kHz, OCL, Mode 4, R L =32 Ω –58 dB Headphone, P O = 12mW, f = 1kHz, SE, Mode 4, R L =32 Ω –73 T WU Wake-Up Time from Shutdown C B = 2.2µF, OCL, RL =32 Ω 90 ms C B = 2.2µF, SE, RL =32 Ω 115 Volume Control Step Size Error ±0.2 dB Digital Volume Range Input referred maximum attenuation -59.5 –60.25 –58.75 dB (min) dB (max) Input referred maximum gain +18 17.25 18.75 dB (min) dB (max) Mute Attenuation Output Mode 1, 3, 5 87 dB MONO_IN Input Impedance R IN and LIN Input Impedance Maximum gain setting 12 8 14 k Ω (min) k Ω (max) Maximum attenuation setting 100 75 125 k Ω (min) k Ω (max) www.national.com 5 |
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