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WM8940CGEFL/V Datasheet(PDF) 8 Page - Wolfson Microelectronics plc |
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WM8940CGEFL/V Datasheet(HTML) 8 Page - Wolfson Microelectronics plc |
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8 / 91 page  WM8940 Production Data w PD, Rev 4.3, November 2011 8 ELECTRICAL CHARACTERISTICS 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 Microphone Input PGA Inputs (MICN, MICP) INPPGAVOL and PGABOOST = 0dB Full-scale Input Signal Level – Single- ended input via LIN/RIN 1 AVDD/3.3 Vrms Full-scale Input Signal Level – Pseudo-differential input 1,2 AVDD*0.7/ 3.3 Vrms Input PGA equivalent input noise INPPGAVOL = +35.25dB No input signal 0 to 20kHz 76.5 dB MICN input resistance INPPGAVOL = +35.25dB 2 k MICN input resistance INPPGAVOL = 0dB 58.5 k MICN input resistance INPPGAVOL = -12dB 97.5 k MICP input resistance All gain settings 124.5 k Input Capacitance All analogue input pins 10 pF Maximum Input PGA Programmable Gain Gain adjusted by INPPGAVOL +33.25 +35.25 +37.25 dB Minimum Input PGA Programmable Gain Gain adjusted by INPPGAVOL -14 -12 -10 dB Programmable Gain Step Size Guaranteed monotonic 0.75 dB Input PGA Mute Attenuation INPPGAMUTE 92 dB Input Gain Boost PGABOOST= 0 0 dB Input Gain Boost PGABOOST = 1 +20 dB Auxiliary Analogue Inputs (AUX) Full-scale Input Signal Level 2 AVDD/3.3 Vrms Input Resistance Input boost and mixer enabled, at 0dB gain 20 k Input Capacitance All analogue Inputs 10 pF Maximum Gain from AUX input PGA mixers Gain adjusted by AUX2BOOSTVOL +4.0 +6 +7.5 dB Minimum Gain from AUX input PGA mixers Gain adjusted by AUX2BOOSTVOL -14 -12 -9 dB AUX2BOOSTVOL step size Guaranteed monotonic 3 dB Analogue to Digital Converter (ADC) - Input from MICN and MICP in differential configuration to input PGA INPPGAVO, PGABOOST and ADCVOL = 0dB Signal to Noise Ratio 3 SNR A-weighted AVDD=3.3V 88 91 dB Total Harmonic Distortion 4 THD -1dBV Input AVDD=3.3V -80 -75 dB Total Harmonic Distortion + Noise 5 THD+N -1dBV Input AVDD=3.3V -75 -68 dB Channel Separation 6 1kHz full scale input signal 100 dBFS |
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