ASAHI KASEI
[AK4644]
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)
min
typ
max
Units
Parameter
MIC Amplifier: LIN1/RIN1/LIN2/RIN2 pins & LIN3/RIN3 pins (AIN3 bit = “1”);
MDIF1=MDIF2 bits = “0” (Single-ended inputs)
Input
Resistance
MGAIN1-0 bits = “00”
MGAIN1-0 bits = “01”, “10”or “11”
MGAIN1-0 bits = “00”
MGAIN1-0 bits = “01”
MGAIN1-0 bits = “10”
MGAIN1-0 bits = “11”
40
20
-
-
-
60
30
0
+20
+26
+32
80
40
-
-
-
kΩ
kΩ
dB
dB
dB
dB
Gain
-
-
MIC Amplifier: IN1+/IN1−/IN2+/IN2− pins; MDIF1 = MDIF2 bits = “1” (Full-differential input)
Maximum Input Voltage (Note 8)
MGAIN1-0 bits = “01”
MGAIN1-0 bits = “10”
MGAIN1-0 bits = “11”
MIC Power Supply: MPWR pin
Output Voltage (Note 9)
Load Resistance
-
-
-
-
-
-
0.228
0.114
0.057
Vpp
Vpp
Vpp
2.22
0.5
-
2.47
-
-
2.72
-
30
V
kΩ
pF
Load Capacitance
ADC Analog Input Characteristics: LIN1/RIN1/LIN2/RIN2 pins & LIN3/RIN3 pins (AIN3 bit = “1”)
→ ADC → IVOL, IVOL=0dB, ALC=OFF
Resolution
-
-
0.198
1.98
83
83
88
72
86
95
86
95
90
100
0.1
0.1
16
0.228
2.28
-
-
-
-
-
-
-
-
-
-
0.8
0.8
Bits
Vpp
Vpp
dBFS
dBFS
dBFS
dBFS
dB
dB
dB
dB
dB
(Note 11)
(Note 12)
(Note 11, LIN1/RIN1/LIN2/RIN2)
(Note 11, LIN3/RIN3)
(Note 12, LIN1/RIN1/LIN2/RIN2)
(Note 12, LIN3/RIN3)
0.168
1.68
71
-
-
-
76
-
76
-
75
-
Input Voltage (Note 10)
S/(N+D)
(−1dBFS)
(Note 11)
D-Range (−60dBFS, A-weighted)
S/N (A-weighted)
(Note 12)
(Note 11)
(Note 12)
(Note 11)
(Note 12)
(Note 11)
(Note 12)
Interchannel Isolation
dB
dB
dB
-
-
Interchannel Gain Mismatch
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)
MS0477-E-01
2006/10
- 7 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
