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AK4644EN Datasheet(PDF) 7 Page - Asahi Kasei Microsystems |
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AK4644EN Datasheet(HTML) 7 Page - Asahi Kasei Microsystems |
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7 / 96 page  ASAHI KASEI [AK4644] MS0477-E-01 2006/10 - 7 - ANALOG CHARACTERISTICS (Ta=25 °C; AVDD, DVDD, HVDD=3.3V; AVSS=DVSS=HVSS=0V; fs=44.1kHz, BICK=64fs; Signal Frequency=1kHz; 16bit Data; Measurement frequency=20Hz ∼ 20kHz; unless otherwise specified) Parameter min typ max Units MIC Amplifier: LIN1/RIN1/LIN2/RIN2 pins & LIN3/RIN3 pins (AIN3 bit = “1”); MDIF1=MDIF2 bits = “0” (Single-ended inputs) MGAIN1-0 bits = “00” 40 60 80 k Ω Input Resistance MGAIN1-0 bits = “01”, “10”or “11” 20 30 40 k Ω MGAIN1-0 bits = “00” - 0 - dB MGAIN1-0 bits = “01” - +20 - dB MGAIN1-0 bits = “10” - +26 - dB Gain MGAIN1-0 bits = “11” - +32 - dB MIC Amplifier: IN1+/IN1 −/IN2+/IN2− pins; MDIF1 = MDIF2 bits = “1” (Full-differential input) Maximum Input Voltage (Note 8) MGAIN1-0 bits = “01” - - 0.228 Vpp MGAIN1-0 bits = “10” - - 0.114 Vpp MGAIN1-0 bits = “11” - - 0.057 Vpp MIC Power Supply: MPWR pin Output Voltage (Note 9) 2.22 2.47 2.72 V Load Resistance 0.5 - - k Ω Load Capacitance - - 30 pF ADC Analog Input Characteristics: LIN1/RIN1/LIN2/RIN2 pins & LIN3/RIN3 pins (AIN3 bit = “1”) → ADC → IVOL, IVOL=0dB, ALC=OFF Resolution - - 16 Bits (Note 11) 0.168 0.198 0.228 Vpp Input Voltage (Note 10) (Note 12) 1.68 1.98 2.28 Vpp (Note 11, LIN1/RIN1/LIN2/RIN2) 71 83 - dBFS (Note 11, LIN3/RIN3) - 83 - dBFS (Note 12, LIN1/RIN1/LIN2/RIN2) - 88 - dBFS S/(N+D) ( −1dBFS) (Note 12, LIN3/RIN3) - 72 - dBFS (Note 11) 76 86 - dB D-Range ( −60dBFS, A-weighted) (Note 12) - 95 - dB (Note 11) 76 86 - dB S/N (A-weighted) (Note 12) - 95 - dB (Note 11) 75 90 - dB Interchannel Isolation (Note 12) - 100 - dB (Note 11) - 0.1 0.8 dB Interchannel Gain Mismatch (Note 12) - 0.1 0.8 dB Note 8. The voltage difference between IN1/2+ and IN1/2 − pins. AC coupling capacitor should be inserted in series at each input pin. Full-differential mic input is not available at MGAIN1-0 bits = “00”. Maximum input voltage of IN1+, IN1 −, IN2+ and IN2− pins is proportional to AVDD voltage, respectively. Vin = 0.069 x AVDD (max)@MGAIN1-0 bits = “01”, 0.035 x AVDD (max)@MGAIN1-0 bits = “10”, 0.017 x AVDD (max)@MGAIN1-0 bits = “11”. When the signal larger than above value is input to IN1+, IN1 −, IN2+ or IN2− pin, ADC does not operate normally. Note 9. Output voltage is proportional to AVDD voltage. Vout = 0.75 x AVDD (typ) Note 10. Input voltage is proportional to AVDD voltage. Vin = 0.06 x AVDD (typ)@MGAIN1-0 bits = “01” (+20dB), Vin = 0.6 x AVDD(typ)@MGAIN1-0 bits = “00” (0dB) Note 11. MGAIN1-0 bits = “01” (+20dB) Note 12. MGAIN1-0 bits = “00” (0dB) |
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