ASAHI KASEI
[AK4645]
アナログ特性
(Ta=25°C; AVDD, DVDD, TVDD, HVDD=3.3V; AVSS=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/LIN4/RIN4 pins & LIN3/RIN3 pins (AIN3 bit = “1”);
MDIF1=MDIF2 bits = “0” (Single-ended inputs)
Input
MGAIN1-0 bits = “00”
40
60
80
kΩ
Resistance MGAIN1-0 bits = “01”, “10”or “11”
20
30
40
kΩ
MGAIN1-0 bits = “00”
-
0
-
dB
MGAIN1-0 bits = “01”
-
+20
-
dB
Gain
MGAIN1-0 bits = “10”
-
+26
-
dB
MGAIN1-0 bits = “11”
-
+32
-
dB
MIC Amplifier:
IN1+/IN1−/IN2+/IN2− pins; MDIF1 = MDIF2 bits = “1” (Full-differential input)
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
-
-
kΩ
Load Capacitance
-
-
30
pF
ADC Analog Input Characteristics:
LIN1/RIN1/LIN2/RIN2/LIN4/RIN4 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
S/(N+D)
(Note 11, LIN3/RIN3/LIN4/RIN4)
-
83
-
dBFS
(−1dBFS)
(Note 12, except for LIN3/RIN3)
-
88
-
dBFS
(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.
プラス入力ピンとマイナス入力ピンの差分です。ACカップリングコンデンサを各入力ピンにシリー
ズに接続して下さい。
MGAIN1-0 bits = “00”のとき差動入力は½用禁止です。
IN1+, IN1−, IN2+, IN2− pin
の最大入力電圧はそれぞれAVDDに比例します。Vin
= |(IN+)
−
(IN−)| = 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”.
この電圧を越える信号が入力された場合、ADCの動½は保証できません。
Note 9.
出力電圧はAVDDに比例します。Vout
= 0.75 x AVDD (typ)。
Note 10.
入力電圧はAVDDに比例します。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)
MS0543-J-00
-7-
2006/09
AKM [ ASAHI KASEI MICROSYSTEMS ]
