MAX9814ETD-T データシートの表示（PDF） - Maxim Integrated
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MAX9814ETD-T Datasheet PDF : 14 Pages
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Microphone Amplifier with AGC and
Low-Noise Microphone Bias
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, SHDN = VDD, CCT = 470nF, CCG = 2µF, GAIN = VDD, TA = TMIN to TMAX, unless otherwise specified. Typical values are
at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
MICOUT High Output Voltage
MICOUT Low Output Voltage
MICOUT Bias
Output Impedance
Minimum Resistive Load
Maximum Capacitive Drive
Maximum Output Current
Output Short-Circuit Current
Power-Supply Rejection Ratio
MICROPHONE BIAS
VOH
IOUT sourcing 1mA
2.45
V
VOL
IOUT sinking 1mA
3
mV
MICOUT unconnected
1.14 1.23 1.32
V
ZOUT
50
Ω
RLOAD_MIN
5
kΩ
CLOAD_MAX
200
pF
IOUT_MAX 1% THD, RL = 500Ω
1
2
mA
ISC
3
8
mA
AGC mode; VDD = 2.7V to 5.5V (Note 4) 35
50
PSRR
f = 217Hz, VRIPPLE = 100mVP-P (Note 5)
55
dB
f = 1kHz, VRIPPLE = 100mVP-P (Note 5)
52.5
f = 10kHz, VRIPPLE = 100mVP-P (Note 5)
43
Microphone Bias Voltage
VMICBIAS
IMICBIAS = 0.5mA
1.84
2.0
2.18
V
Output Resistance
RMICBIAS
IMICBIAS = 1mA
1
Ω
Output Noise Voltage
VMICBIAS_NOISE IMICBIAS = 0.5mA, BW = 22Hz to 22kHz
5.5
µVRMS
DC, VDD = 2.7V to 5.5V
70
80
Power-Supply Rejection Ratio
PSRR
IMICBIAS = 0.5mA, VRIPPLE = 100mVP-P,
fIN = 1kHz
71
dB
TRILEVEL INPUTS (A/R, GAIN)
Tri-Level Input Leakage Current
A/R or GAIN = VDD
A/R or GAIN = GND
0.5VDD 0.5VDD 0.5VDD
/ 180kΩ / 100kΩ / 50kΩ
mA
0.5VDD 0.5VDD 0.5VDD
/ 180kΩ / 100kΩ / 50kΩ
Input High Voltage
VIH
Input Low Voltage
VIL
Shutdown Enable Time
tON
Shutdown Disable Time
tOFF
DIGITAL INPUT (SHDN)
SHDN Input Leakage Current
VDD x 0.7
V
VDD x 0.3 V
60
ms
40
ms
-1
+1
µA
Input High Voltage
VIH
Input Low Voltage
VIL
AGC THRESHOLD INPUT (TH)
1.3
V
0.5
V
TH Input Leakage Current
-1
+1
µA
Note 1: Devices are production tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 2: Dynamic range is calculated using the EIAJ method. The input is applied at -60dBFS (0.707µVRMS), fIN = 1kHz.
Note 3: Attack time measured as time from AGC trigger to gain reaching 90% of its final value.
Note 4: CG is connected to an external DC voltage source, and adjusted until VMICOUT = 1.23V.
Note 5: CG connected to GND with 2.2µF.
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