[AK4646]
Units
ANALOG CHARACTERISTICS
(Ta=25°C; AVDD=DVDD=SVDD=3.3V; AVSS=DVSS=SVSS=0V; fs=44.1kHz, BICK=64fs;
Signal Frequency=1kHz; 16bit Data; Measurement frequency=20Hz ∼ 20kHz; unless otherwise specified)
min
typ
max
Parameter
MIC Amplifier: LIN1, RIN1, LIN2, RIN2 pins; MDIF1 = MDIF2 bits = “0” (Single-ended inputs)
Input Resistance
MGAIN2-0 bits = “000”
20
-
-
-
-
-
-
-
-
30
0
40
-
-
-
-
-
-
-
-
kΩ
dB
dB
dB
dB
dB
dB
dB
dB
MGAIN2-0 bits = “001”
MGAIN2-0 bits = “010”
MGAIN2-0 bits = “011”
MGAIN2-0 bits = “100”
MGAIN2-0 bits = “101”
MGAIN2-0 bits = “110”
MGAIN2-0 bits = “111”
+20
+26
+32
+10
+17
+23
+29
Gain
MIC Amplifier: IN1+, IN1−, IN2+, IN2− pins; MDIF1 = MDIF2 bits = “1” (Full-differential input)
Input Voltage (Note 12)
MGAIN2-0 bits = “001”
MGAIN2-0 bits = “010”
MGAIN2-0 bits = “011”
MGAIN2-0 bits = “100”
MGAIN2-0 bits = “101”
MGAIN2-0 bits = “110”
MGAIN2-0 bits = “111”
MIC Power Supply: MPWR pin
Output Voltage (Note 13)
Load Resistance
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0.242
0.121
0.061
0.765
0.342
0.171
0.086
Vpp
Vpp
Vpp
Vpp
Vpp
Vpp
Vpp
2.38
0.5
-
2.64
-
-
2.90
-
30
V
kΩ
pF
Load Capacitance
ADC Analog Input Characteristics: LIN1/RIN1/LIN2/RIN2 pins → ADC → IVOL, IVOL=0dB, ALC=OFF
Resolution
-
-
0.210
2.10
83
88
86
95
86
95
90
16
0.242
2.42
-
-
-
-
-
-
-
-
0.8
0.8
Bits
Vpp
Vpp
dBFS
dBFS
dB
dB
dB
dB
dB
(Note 15)
(Note 16)
(Note 15)
(Note 16)
(Note 15)
(Note 16)
(Note 15)
(Note 16)
(Note 15)
(Note 16)
(Note 15)
(Note 16)
0.178
Input Voltage (Note 14)
1.78
73
-
76
-
76
-
75
-
S/(N+D)
D-Range
S/N
(−1dBFS)
(−60dBFS, A-weighted)
(A-weighted)
Interchannel Isolation
100
0.1
0.1
dB
dB
dB
-
-
Interchannel Gain Mismatch
Note 12. 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 MGAIN2-0 bits = “000”. Maximum input voltage of
IN1+, IN1−, IN2+ and IN2− pins is proportional to AVDD voltage, respectively.
Vin = |(IN1/2+) − (IN1/2−)| = 0.073 x AVDD (max)@MGAIN2-0 bits = “001”, 0.037 x AVDD
(max)@MGAIN2-0 bits = “010”, 0.018 x AVDD (max)@MGAIN2-0 bits = “011”, 0.232 x AVDD
(max)@MGAIN2-0 bits = “100”, 0.104 x AVDD (max)@MGAIN2-0 bits = “101”, 0.052 x AVDD
(max)@MGAIN2-0 bits = “110”, 0.026 x AVDD (max)@MGAIN2-0 bits = “111”
Note 13. Output voltage is proportional to AVDD voltage. Vout = 0.8 x AVDD (typ)
Note 14. Input voltage is proportional to AVDD voltage Vin = 0.0636 x AVDD (typ)@MGAIN2-0 bits = “001” (+20dB),
Vin = 0.636 x AVDD (typ)@MGAIN2-0 bits = “000” (0dB)
Note 15. MGAIN2-0 bits = “001” (+20dB)
Note 16. MGAIN2-0 bits = “000” (0dB)
MS0557-E-05
2011/01
- 8 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
