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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8940CGEFL/V 데이터시트(PDF) 9 Page - Wolfson Microelectronics plc |
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WM8940CGEFL/V 데이터시트(HTML) 9 Page - Wolfson Microelectronics plc |
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9 / 91 page  Production Data WM8940 w PD, Rev 4.3, November 2011 9 Test Conditions DCVDD = 1.8V, AVDD = DBVDD = 3.3V, 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 Digital to Analogue Converter (DAC) to MONO Output with 10k / 50pF load and DACVOL 0dB Full-scale output 1 DACVOL = 0dB AVDD/3.3 Vrms Signal to Noise Ratio 3 SNR A-weighted AVDD=SPKVDD=3.3V 93 98 dB Total Harmonic Distortion 4 THD 0dBFS input AVDD=SPKVDD=3.3V -80 -75 dBFS Total Harmonic Distortion + Noise 5 THD+N 0dBFS input AVDD=SPKVDD=3.3V -78 -74 dBFS Channel Separation 6 1kHz signal 100 dB MICP and MICN input PGA to input boost stage into 10k / 50pF load on SPKOUTP and SPKOUTP INPPGAVOL, PGABOOST = 0dB Full-scale output voltage, 0dB gain SPKVDD/3.3 Vrms Signal to Noise Ratio 3 SNR A-weighted AVDD=SPKVDD=3.3V 94 99 dB Total Harmonic Distortion 4 THD full-scale signal AVDD=SPKVDD=3.3V -90 -85 dBFS Total Harmonic Distortion + Noise 5 THD+N full-scale signal AVDD=SPKVDD=3.3V -87 -82 dBFS Channel Separation 6 100 dB DAC to Speaker Output (SPKOUTP, SPKOUTN with 8 bridge tied load) Bypass mode Output Power Po Output power is closely correlated with THD see below Total Harmonic Distortion 4 THD Po=350mW, RL = 8Ω SPKVDD=3.3V 0.03 -70 -60 % dB Signal to Noise Ratio 3 SNR A-weighted SPKVDD=3.3V 93.5 98 dB Power Supply Rejection Ratio (50Hz-22kHz) PSRR RL = 8 BTL 50 dB AUX In to Headphone Output (SPKOUTP, SPKOUTN with 16R resistive load to GND) Bypass mode Signal to Noise Ratio 3 SNR A-weighted SPKVDD=3.3V 95 99 dB Total Harmonic Distortion 4 THD Po=20mW, RL = 16Ω SPKVDD=3.3V 0.02 -74 -67 % dB Microphone Bias Bias Voltage MBVSEL=0 0.9*AVDD V MBVSEL=1 0.65*AVDD 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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