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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8940 데이터시트(PDF) 9 Page - Wolfson Microelectronics plc |
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WM8940 데이터시트(HTML) 9 Page - Wolfson Microelectronics plc |
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9 / 85 page  Pre-Production WM8940 w Pre-Production, Rev 3.0, February 2007 9 Digital to Analogue Converter (DAC) to MONO Output with 10k Ω / 50pF load and DACVOL 0dB Full-scale output 1 DACVOL = 0dB AVDD1/3.3 Vrms Signal to Noise Ratio 3 SNR A-weighted AVDD1=AVDD2=3.3V 98 dB Total Harmonic Distortion 4 THD 0dBFS input AVDD1=AVDD2=3.3V -80 dBFS Total Harmonic Distortion + Noise 5 THD+N 0dBFS input AVDD1=AVDD2=3.3V -78 dBFS Channel Separation 6 1kHz signal 100 dB MICP and MICN input PGA to input boost stage into 10k Ω / 50pF load on SPKOUTP and SPKOUTP INPPGAVOL, PGABOOST = 0dB Full-scale output voltage, 0dB gain AVDD2/3.3 Vrms Signal to Noise Ratio 3 SNR A-weighted AVDD1=AVDD2=3.3V 98 dB Total Harmonic Distortion 4 THD full-scale signal AVDD1=AVDD2=3.3V -80 dBFS Total Harmonic Distortion + Noise 5 THD+N full-scale signal AVDD1=AVDD2=3.3V -78 dBFS Channel Separation 6 100 dB Speaker Output (SPKOUTP, SPKOUTN with 8 Ω bridge tied load) Output Power Po Output power is closely correlated with THD see below Po=150mW, RL = 8Ω SPKVDD=3.3V 0.03 -68 % dB Total Harmonic Distortion 4 THD Po=350mW, RL = 8Ω SPKVDD=3.3V 2.944 -30.6 % dB Signal to Noise Ratio 3 SNR A-weighted SPKVDD=3.3V 98 dB Power Supply Rejection Ratio (50Hz-22kHz) PSRR RL = 8 Ω BTL 50 dB Headphone Output (SPKOUTP, SPKOUTN with resistive load to GND) Signal to Noise Ratio 3 SNR A-weighted SPKVDD=3.3V 98 dB Total Harmonic Distortion 4 THD Po=20mW, RL = 16Ω SPKVDD=3.3V 0.02 -72 % dB Microphone Bias MBVSEL=0 0.9*AVDD1 V Bias Voltage MBVSEL=1 0.65*AVDD1 V Bias Current Source for VMICBIAS within +/-3% 3 Ma Output Noise Voltage 1kHz 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 All digital pins 10 pF |
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