ASAHI KASEI
[AK4641]
ANALOG CHARACTERISTICS
(Ta=25°C; AVDD=DVDD=BVDD=3.3V; AVSS=DVSS=BVSS=0V; Signal Frequency=1kHz; 16bit Data;
Stereo CODEC: fs=44.1kHz, BICK=64fs; Measurement frequency=20Hz
∼
20kHz;
Mono CODEC: Bfs=8kHz; BBICK=32Bfs; Measurement frequency=20Hz
∼
3.4kHz; unless otherwise specified)
Min
typ
max
Units
Parameter
MIC Amplifier
Input Resistance
20
30
40
kΩ
MGAIN bit = “0”
-
0
-
dB
Gain
MGAIN bit = “1”
-
+20
-
dB
MIC Power Supply
Output Voltage
(Note 4)
2.22
2.47
2.72
V
Load Resistance
2
-
-
kΩ
Load Capacitance
-
-
30
pF
MIC Detection
Comparator Voltage Level
(Note 5)
0.165
-
0.257
V
Internal pull down Resistance
250
500
750
kΩ
Input PGA Characteristics:
Input Resistance
(Note 6)
5
10
15
kΩ
Step Size
0.1
0.5
0.9
dB
Max (IPGA6-0 bits = “47H”)
-
+27.5
-
dB
Gain Control Range
Min (IPGA6-0 bits = “00H”)
-
-
dB
−8
ADC Analog Input Characteristics of Stereo CODEC:
MIC Gain=+20dB, IPGA=0dB, ALC1=OFF, MIC
→
IPGA
→
ADC of Stereo CODEC
Resolution
-
-
16
Bits
Input Voltage (MIC Gain=+20dB, Note 7)
0.168
0.198
0.228
Vpp
S/(N+D)
71
81
-
dB
(−1dBFS)
D-Range
78
86
-
dB
(−60dBFS, A-weighted)
MIC Gain=+20dB, A-weighted
78
86
-
dB
S/N
MIC Gain=0dB, A-weighted
-
92
-
dB
DAC Characteristics of Stereo CODEC:
Resolution
-
-
16
Bits
Stereo Line Output Characteristics:
R
L
=10kΩ, DAC of Stereo CODEC
→
LOUT/ROUT pins
Output Voltage
(Note 8)
1.78
1.98
2.18
Vpp
S/(N+D)
(0dBFS)
76
86
-
dBFS
S/N
(A-weighted)
82
90
-
dB
Interchannel Isolation
-
100
-
dB
Interchannel Gain Mismatch
-
0.1
0.5
dB
Load Resistance
10
-
-
kΩ
Load Capacitance
-
-
30
pF
Note 4. Output voltage is proportional to AVDD voltage. Vout = 0.75 x AVDD (typ).
Note 5. Comparator Voltage Level is proportional to AVDD voltage. Vout = 0.05 x AVDD (min), 0.078 x AVDD (max).
Note 6. When IPGA Gain is changed, this typical value changes between 8kΩ and 11kΩ.
Note 7. Input voltage is proportional to AVDD voltage. Vin = 0.06 x AVDD (typ).
Note 8. Output voltage is proportional to AVDD voltage. Vout = 0.6 x AVDD (typ).
MS0301-E-00
-6-
2004/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
