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LM4931ITL/NOPB Datasheet(PDF) 6 Page - Texas Instruments |
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LM4931ITL/NOPB Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 50 page  LM4931 SNAS251E – APRIL 2004 – REVISED MAY 2013 www.ti.com Electrical Characteristics DVDD = 3V, AVDD = 3V, RLHP = 32Ω, RLHF = 8Ω (1)(2) (continued) The following specifications apply for the circuit shown in Figure 62, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4931 Units (Limits) Typical(3 Limits(4) ) Signal = VO at 0dBFS, f = 1kHz and 1% THD+N, Noise = digital zero, A-weighted, Signal-to-Noise Ratio of Voice SNR (Voice) 0dB gain setting(7) Channel (Headphone Amplifier) fMCLK = 12.288MHz, PLL disabled 75 dB fMCLK = 12MHz, PLL active 73 dB Signal = VO at 0dBFS, f = 1kHz and 1% THD+N, Noise = digital zero, A-weighted, Signal-to-Noise Ratio of Music SNR (Music) 0dB gain setting(7) Channel (Headphone Amplifier) fMCLK = 12.288MHz, PLL disabled 86 dB fMCLK = 12MHz, PLL active 82 dB XTALK Stereo Channel-to-Channel Crosstalk fS = 48kHz, 62 dB fIN = 1kHz sinewave at –3dBFS ΔACH-CH Stereo Channel-to-Channel Gain 0.3 dB Mismatch A-weighted filter, Vin = digital zero(7) eN (Music) Output Noise fMCLK = 12.288MHz, PLL disabled 45 μV fMCLK = 12MHz, PLL active 65 μV Minimum Gain –46.5 dB Volume Control Range (Headphone VCR Amplifier) Maximum Gain 0 dB SS Volume Control Stepsize (Headphone 1.5 dB Amplifier) Microphone Amplifier VBIAS Mic Bias Voltage 2 V Minimum Gain 6 dB Gain Control Range (Microphone GCR Amplifier) Maximum Gain 36 dB SS Gain Control Stepsize (Microphone 2 dB Amplifier) Voice Codec (Typical numbers are with 1.024MHz voice clock and 8kHz sampling frequency) RVDAC Voice DAC Ripple 300Hz-3.3kHz through headphone output. +/- 0.15 dB RVADC Voice ADC Ripple 300Hz-3.3kHz through headphone output. +/- 0.25 dB PBVDAC Voice DAC Passband –3dB Point 3.46 kHz SBAVDAC Voice DAC Stopband Attenuation Above 4kHz 72 dB UPBVDAC Upper Passband Cutoff Frequency Upper – 3dB Point 3.47 kHz LPBVDAC Lower Passband Cutoff Frequency Lower – 3dB Point 0.230 kHz SBAVADC Voice ADC Stopband Attenuation Above 4kHz 65 dB SBANOTCH Voice ADC Notch Attenuation Centered on 55Hz, figure gives worst case 58 dB attenuation for 50Hz & 60Hz Signal = VO at 0dBFS, f = 1kHz and 1% THD+N, MIC_P, MIC_N Terminated to ground, Signal-to-Noice Ratio of Voice SNR (Voice) A-weighted, 36dB MIC Preamp gain setting(8) Channel (Voice ADC path) fMCLK = 12.288MHz, PLL disabled 81 dB fMCLK = 12MHz, PLL active 80 dB Minimum Gain –30 dB STR Side Tone Range Maximum Gain 0 dB (8) Disabling or bypassing the PLL will result in an improvement in noise measurements. 6 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LM4931 |
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