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LM4930 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM4930 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 33 page Electrical Characteristics DV DD = 3.3V, AVDD = 5V, RLHP =32Ω,RLHF =8Ω (Notes 1, 2, 8) (Continued) The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T A= 25˚C. Symbol Parameter Conditions LM4930 Units (Limits) Typical (Note 6) Limits (Notes 7, 15) V MIC_BIAS Mic Bias Voltage 2.0 V THD+N Headphone Amplifier Total Harmonic Motion Distortion + Noise f IN = 1 kHz, POUT = 7.5mW; 32 Ω Stereo Load 0.07 % P OHP Headphone Amplifier Output Power THD+N = 0.5%, f OUT = 1kHz 27 20 mW (min) P OLS Mono Speaker Amplifier Output Power THD+N = 3%, f OUT = 1kHz 1 W PSRR Power Supply Rejection Ratio C BYPASS = 1.0µF C DAC_REF = 1.0µF V RIPPLE = 200mVP-P @ 217Hz, MIC_P, MIC_N terminated with 10 Ω to ground 55 45 dB (min) SNR (Voice) Signal-to-Noise Ratio (Voice Audio Path) Signal = Vo at f = 1kHz @1% THD+N, 32 Ω Stereo Load; Noise = digital zero, A-weighted, 0dB gain setting 72 dB SNR (Music) Signal-to-Noise Ratio (Music Audio Path) Signal = Vo at f = 1kHz @1% THD+N, 32 Ω Stereo Load; Noise = digital zero, A-weighted; 0dB gain setting 86 dB DR (Voice) Dynamic Range (Voice Audio Path) Signal = Vo at f = 1kHz @1% THD+N, 32 Ω Stereo Load; Noise for -60dBFS digital input; A-weighted; 0dB gain setting 72 dB DR (Music) Dynamic Range (Music Audio Path) Signal = Vo at f=1kHz @1% THD+N, 32 Ω Stereo Load; Noise for -60dBFS digital input; A-weighted, 0dB gain setting 86 dB SNR ADC Signal-to-Noise Ratio (Voice ADC Path) Reference signal = 0dBFS MIC_P, MIC_N terminated with 10 Ω to ground; A-weighted; 47dB MIC preamp gain setting 75 dB DR ADC Dynamic Range (Voice ADC Path) Reference signal = 0dBFS Noise for -60dBFS digital input; A-weighted; 47dB MIC preamp gain setting 75 dB X TALK Stereo Channel-to-Channel Crosstalk f S = 48kHz, fIN = 1kHz sinewave at -3dB FS 75 dB V MIC-IN Maximum Differential MIC Input Voltage 17dB MIC Preamp gain setting 570 mV P-P R VDAC Voice DAC Ripple 300Hz - 3.3kHz through head-phone output. +/-0.15 +/-0.2 dB (max) R VADC Voice ADC Ripple 300Hz - 3.3kHz through head-phone output. +/-0.25 +/-0.3 dB (max) PB VDAC Voice DAC Passband -3dB Point 3.46 kHz SBA VDAC Voice DAC Stopband Attenuation Above 4kHz 72 dB UPB VADC Voice ADC Upper Passband Cutoff Frequency. Upper -3dB Point 3.47 kHz www.national.com 10 |
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