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LM4931 Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LM4931 Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 47 page  Electrical Characteristics DV DD = 3V, AVDD = 3V, RLHP =32Ω,RLHF =8Ω (Notes 1, 2) (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 LM4931 Units (Limits) Typical (Note 6) Limits (Note 7) VCR Volume Control Range (Headphone Amplifier) Minimum Gain –46.5 dB Maximum Gain 0 dB SS Volume Control Stepsize (Headphone Amplifier) 1.5 dB Microphone Amplifier V BIAS Mic Bias Voltage 2 V GCR Gain Control Range (Microphone Amplifier) Minimum Gain 6 dB Maximum Gain 36 dB SS Gain Control Stepsize (Microphone Amplifier) 2dB Voice Codec (Typical numbers are with 1.024MHz voice clock and 8kHz sampling frequency) R VDAC Voice DAC Ripple 300Hz-3.3kHz through headphone output. +/- 0.15 dB R VADC Voice ADC Ripple 300Hz-3.3kHz through headphone output. +/- 0.25 dB PB VDAC Voice DAC Passband –3dB Point 3.46 kHz SBA VDAC Voice DAC Stopband Attenuation Above 4kHz 72 dB UPB VDAC Upper Passband Cutoff Frequency Upper – 3dB Point 3.47 kHz LPB VDAC Lower Passband Cutoff Frequency Lower – 3dB Point 0.230 kHz SBA VADC Voice ADC Stopband Attenuation Above 4kHz 65 dB SBA NOTCH Voice ADC Notch Attenuation Centered on 55Hz, figure gives worst case attenuation for 50Hz & 60Hz 58 dB SNR (Voice) Signal-to-Noice Ratio of Voice Channel (Voice ADC path) Signal = V O at 0dBFS, f = 1kHz and 1% THD+N, MIC_P, MIC_N Terminated to ground, A-weighted, 36dB MIC Preamp gain setting (Note 10) f MCLK = 12.288MHz, PLL disabled 81 dB f MCLK = 12MHz, PLL active 80 dB STR Side Tone Range Minimum Gain –30 dB Maximum Gain 0 dB SS Side Tone Step Size 3 dB Audio DAC (Typical numbers are with 6.144MHz audio clock and 48kHz sampling frequency) R DAC Audio DAC Ripple 20Hz–20kHz through headphone output +/-0.1 dB PB DAC Audio DAC Passband width –3dB point 22.7 kHz SBA DAC Audio DAC Stop band Attenuation Above 24kHz 76 dB DR DAC Audio DAC Dynamic Range DC – 20kHz 97 dB SNR DAC Audio DAC SNR Digital Filter Section DC – 20kHz 97 dB PLL f IN Input Frequency on MCLK pin 12 10 25 MHz (min) MHz (max) SPI/I 2C f SPI Maximum SPI Frequency 400 4000 kHz (max) t SPISETD SPI Data Setup Time 100 ns (min) t SPISETENB SPI ENB Setup Time 100 ns (min) t SPIHOLDD SPI Data Hold Time 100 ns (min) www.national.com 7 |
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