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WM8978GEFL/V Datasheet(PDF) 7 Page - Wolfson Microelectronics plc |
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WM8978GEFL/V Datasheet(HTML) 7 Page - Wolfson Microelectronics plc |
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7 / 78 page  Product Preview WM8978 w PP Rev 1.7 January 2005 7 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 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 ALCMODE=0 (ALC), MCLK=12.288MHz (Note 3) 3.3, 6.6, 13.1, … , 3360 (time doubles with each step) Gain Ramp-Up (Decay) Time (Note 4,5) tDCY ALCMODE=1 (limiter), MCLK=12.288MHz (Note 3) 0.73, 1.45, 2.91, … , 744 (time doubles with each step) ms ALCMODE=0 (ALC), MCLK=12.288MHz (Note 3) 0.83, 1.66, 3.33, … , 852 (time doubles with each step) Gain Ramp-Down (Attack) Time (Note 4,5) tATK ALCMODE=1 (limiter), MCLK=12.288MHz (Note 3) 0.18, 0.36, 0.73, … , 186 (time doubles with each step) ms Mute Attenuation TBD dB Analogue to Digital Converter (ADC) Signal to Noise Ratio (Note 6,7) A-weighted, 0dB gain 90 dB Total Harmonic Distortion (Note 8) full-scale, 0dB gain -80 dB Channel Separation (Note 9) 1kHz input signal 100 dB Digital to Analogue Converter (DAC) to Line-Out (LOUT1, ROUT1 with 10k Ω Ω Ω Ω / 50pF load) PGA gains set to 0dB, OUT34BOOST=0 AVDD/3.3 Full-scale output PGA gains set to 0dB, OUT34BOOST=1 1.5x (AVDD/3.3) Vrms Signal to Noise Ratio (Note 6,7) SNR A-weighted TBD 98 dB Total Harmonic Distortion (Note 8) THD RL = 10k Ω full-scale signal -84 dB Channel Separation (Note 9) 1kHz signal 80 100 dB Output Mixers (LMX1, RMX1) PGA gain range into mixer -15 0 +6 dB PGA gain step into mixer 3 dB Analogue Outputs (LOUT1, ROUT1, LOUT2, ROUT2) Programmable Gain range -57 0 +6 dB Programmable Gain step size Monotonic 1 dB Mute attenuation 1kHz, full scale signal 85 dB Headphone Output (LOUT1, ROUT1 with 32 Ω Ω Ω Ω load) 0dB full scale output voltage AVDD/3.3 Vrms Signal to Noise Ratio SNR A-weighted TBD 93 dB RL = 16 Ω, Po=20mW AVDD=3.3V 0.008 -81 % dB Total Harmonic Distortion THD RL = 32 Ω, Po=20mW AVDD=3.3V 0.007 - 83 % dB |
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