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WM8978CGEFL/V Datasheet(PDF) 8 Page - Wolfson Microelectronics plc |
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WM8978CGEFL/V Datasheet(HTML) 8 Page - Wolfson Microelectronics plc |
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8 / 118 page  WM8978 Production Data w PD, Rev 4.5, October 2011 8 Test Conditions DCVDD=1.8V, AVDD=DBVDD=SPKVDD= 3.3V, TA = +25 oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Automatic Level Control (ALC) Target Record Level -22.5 -1.5 dB Programmable gain -12 35.25 Gain Hold Time (Note 3,5) tHOLD MCLK = 12.288MHz (Note 3) 0, 2.67, 5.33, 10.67, … , 43691 (time doubles with each step) ms Gain Ramp-Up (Decay) Time (Note 4,5) tDCY ALCMODE=0 (ALC), MCLK=12.288MHz (Note 3) 3.3, 6.6, 13.1, … , 3360 (time doubles with each step) ms ALCMODE=1 (limiter), MCLK=12.288MHz (Note 3) 0.73, 1.45, 2.91, … , 744 (time doubles with each step) Gain Ramp-Down (Attack) Time (Note 4,5) tATK ALCMODE=0 (ALC), MCLK=12.288MHz (Note 3) 0.83, 1.66, 3.33, … , 852 (time doubles with each step) ms ALCMODE=1 (limiter), MCLK=12.288MHz (Note 3) 0.18, 0.36, 0.73, … , 186 (time doubles with each step) Mute Attenuation 120 dB Analogue to Digital Converter (ADC) Signal to Noise Ratio (Note 6) SNR A-weighted, 0dB gain 85 95 dB Total Harmonic Distortion (Note 7) THD -3dBFS input -84 -74 dB Channel Separation (Note 9) 1kHz input signal 110 dB Digital to Analogue Converter (DAC) to Line-Out (LOUT1, ROUT1 with 10k / 50pF load) Full-scale output PGA gains set to 0dB, OUT34BOOST=0 AVDD/3.3 Vrms PGA gains set to 0dB, OUT34BOOST=1 1.5x (AVDD/3.3) Signal to Noise Ratio (Note 6) SNR A-weighted 90 98 dB Total Harmonic Distortion (Note 7) THD RL = 10k full-scale signal -84 -76 dB Channel Separation (Note 8) 1kHz signal 110 dB Output Mixers (LMX1, RMX1) Maximum PGA gain into mixer +6 dB Minimum PGA gain into mixer -15 dB PGA gain step into mixer Guaranteed monotonic 3 dB Analogue Outputs (LOUT1, ROUT1, LOUT2, ROUT2) Maximum Programmable Gain +6 dB Minimum Programmable Gain -57 dB Programmable Gain step size Guaranteed monotonic 1 dB Mute attenuation 1kHz, full scale signal 85 dB Headphone Output (LOUT1, ROUT1 with 32 load) 0dB full scale output voltage AVDD/3.3 Vrms Signal to Noise Ratio SNR A-weighted 102 dB Total Harmonic Distortion THD RL = 16, Po=20mW AVDD=3.3V 0.003 -92 % dB RL = 32 , Po=20mW AVDD=3.3V 0.008 - 82 % dB |
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