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AS3543 数据表(PDF) 19 Page - ams AG |
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AS3543 数据表(HTML) 19 Page - ams AG |
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19 / 92 page  www.austriamicrosystems.com Revision 1.11 18 - 91 AS3543 3v2 Data Sheet - D e t a i l e d D e s c r i p t i o n - A u d i o F u n c t i o n s 8.2.4 Remote Control Fast changes of the supply current of typically 500uA are detected as a remote button press, and an interrupt is gener- ated. Then the CPU can start the measurement of the microphone supply current with the internal 10-bit ADC to distin- guish which button was pressed. As the current measurement is done via an internal resistor, only two buttons generating a current of about 0.5mA and 1mA can be detected. With this, 1mA as microphone bias is still available. 8.2.5 Voice Activation Further a built-in voice activation comparator can actuate an interrupt if microphone input voltage of about 5mVRMS is detected. 8.2.6 Parameter AVDD17=1.7V, AVDD27=2.7V, TA= 25 o C unless otherwise mentioned Table 9. Microphone Input Parameter Symbol Parameter Condition Min Typ Max Unit VMICIN0 Input Signal Level AMICPRE = 30dB; AMIC = 0dB 20 mVP VMICIN1 AMICPRE = 36dB; AMIC = 0dB 10 mVP VMICIN2 AMICPRE = 42dB; AMIC = 0dB 5 mVP RMICIN Input Impedance MICP, MICN to AGND 7.5 k ∆MICIN Input Impedance Tolerance -7 +33 % CMICIN Input Capacitance 5 pF AMICPRE Microphone Preamplifier Gain Preamplifier has 3 selectable (fixed) gain settings 30 36 42 dB AMIC Programmable Gain -40.5 +6 dB Gain Steps discrete logarithmic gain steps 1.5 dB Gain Step Precision ±0.25 dB VATTACK Limiter Activation Level 0.57 VPEAK VDECAY Limiter Release Level 0.47 VPEAK AMICLIMIT Limiter Gain Overdrive 128 @ 0.375dB 30 36 42 dB tATTACK Limiter Attack Time 50 µs/6dB tDECAY Limiter Decay Time 120 ms/ 6dB AMICMUTE Mute Attenuation 100 dB VMICSUP Microphone Supply Voltage depending on V_MICS setting 2 1.55 1.26 1.06 V IMICMAX Max. Microphone Supply Current microphones nominally need a bias current of 0.5mA-1mA 6.5 mA VNOISE Microphone Supply Voltage Noise 5 µV IMICDET Microphone Detection Current 50 µA IREMDET Max. Remote Detection Current 500 µA |
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