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WM8978CGEFL/V Datasheet(PDF) 9 Page - Wolfson Microelectronics plc |
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WM8978CGEFL/V Datasheet(HTML) 9 Page - Wolfson Microelectronics plc |
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9 / 118 page  Production Data WM8978 w PD, Rev 4.5, October 2011 9 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 Speaker Output (LOUT2, ROUT2 with 8 bridge tied load, INVROUT2=1) Full scale output voltage, 0dB gain. (Note 9) SPKBOOST=0 SPKVDD/3.3 Vrms SPKBOOST=1 (SPKVDD/3.3)*1.5 Output Power PO Output power is very closely correlated with THD; see below Total Harmonic Distortion THD PO =200mW, RL = 8, SPKVDD=3.3V 0.04 -68 % dB PO =320mW, RL = 8, SPKVDD=3.3V 1.0 -40 % dB PO =500mW, RL = 8, SPKVDD=5V 0.02 -74 % dB PO =860mW, RL = 8, SPKVDD=5V 1.0 -40 % dB Signal to Noise Ratio SNR SPKVDD=3.3V, RL = 8 90 dB SPKVDD=5V, RL = 8 90 dB Power Supply Rejection Ratio (50Hz-22kHz) PSRR RL = 8 BTL 80 dB RL = 8 BTL SPKVDD=5V (boost) 69 dB OUT3/OUT4 Outputs (with 10k / 50pF load) Full-scale output voltage, 0dB gain (Note 10) OUT3BOOST=0/ OUT4BOOST=0 SPKVDD/3.3 Vrms OUT3BOOST=1 OUT4BOOST=1 (SPKVDD/3.3)*1.5 Vrms Signal to Noise Ratio (Note 6) SNR A-weighted 98 dB Total Harmonic Distortion (Note 7) THD RL = 10 k full-scale signal -84 dB Channel Separation (Note 8) 1kHz signal 100 dB Power Supply Rejection Ratio (50Hz-22kHz) PSRR RL = 10k 52 dB RL = 10k SPKVDD=5V (boost) 56 dB Microphone Bias Bias Voltage VMICBIAS MBVSEL=0 0.9*AVDD V MBVSEL=1 0.65*AVDD V Bias Current Source IMICBIAS 3 mA Output Noise Voltage Vn 1K to 20kHz 15 nV/ Hz Digital Input / Output Input HIGH Level VIH 0.7 DBVDD V Input LOW Level VIL 0.3 DBVDD V Output HIGH Level VOH IOL=1mA 0.9 DBVDD V Output LOW Level VOL IOH-1mA 0.1xDBVDD V Input capacitance 10 pF Input leakage 50 pA |
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