ASAHI KASEI
AKM CONFIDENTIAL
[AK4561]
ANALOG CHARACTERISTICS
(Ta=25°C; VA=VD=MVDD=VT=2.8V, HVDD=4.5V; AGND=DGND=MVSS=0V; fs=48kHz;
Input Frequency =1kHz; Measurement width=20Hz
∼
20kHz; unless otherwise specified)
Parameter
min
typ
max
Units
Pre-Amp Characteristics:
Input Resistance: Positive Input Pin (Note 7)
100
kΩ
Negative Input Pin (Note 8)
1.5
kΩ
Maximum Output Voltage (Note 9)
-3.2
dBV
Output Voltage (Input Voltage = -26dBV, Gain = +16dB) (Note 10)
-10
dBV
Step (+12, +16, +20, +24dB)
+4
dB
Load Resistance
2
kΩ
Load Capacitance (Note 11)
20
pF
Inverter-Amp Characteristics:
(Gain:0dB)
Maximum Output Voltage (Note 9)
-3.2
dBV
Load Resistance
3
kΩ
Load Capacitance (Note 11)
20
pF
EQ-Amp Characteristics:
(Gain:0dB)
Maximum Output Voltage (Note 9)
-3.2
dBV
Load Resistance
3
kΩ
Load Capacitance (Note 11)
20
pF
HPF-Amp Characteristics:
(Gain: 0dB)
Maximum Output Voltage (Note 9)
-3.2
dBV
Load Resistance
3
kΩ
Load Capacitance (Note 11)
20
pF
MIC Block Characteristics:
Measured via HPF_O_L/HPF_O_R (Note 10)
S/(N+D) (-10dBV Output) (Note 12)
60
dB
(Note 10)
60
dB
Output Noise Voltage (No signal input, Rg = 1kΩ) (Note 12)
-94
dBV
(Note 10)
-99
dBV
Interchannel Gain Mismatch (Note 12)
0.5
dB
(Note 10)
0.5
dB
Interchannel Isolation (Note 12)
70
dB
(Note 10)
70
dB
MIC Power Supply Characteristics:
Output Voltage (5kΩ Load)
2.0
V
Output Current
3
mA
Note 7. INT_MIC_L, INT_MIC_R, EXT_MIC_L and EXT_MIC_R pins
Note 8. Gain of Pre-Amp is +16dB. Input resistance of Pre-Amp is changed by gain.
Gain=12dB: 2.4k
±
30%Ω, Gain=20dB: 950
±
30%Ω, Gain=24dB: 600
±
30%Ω
Note 9. Maximum output voltage is typically (MVDD x 0.7) V.
Note 10. Pre-Amp(Gain:+16dB)
→
HPF-Amp (Gain:0dB, HPF OFF)
Note 11. When output pin drives some capacitive load, some resistor should be added in series between output pin and
capacitive load.
Note 12. Pre-Amp (Gain: +16dB)
→
Inverter-Amp (Gain: +0dB)
→
EQ-Amp (Input/Feedback resistance: 5kΩ)
→
HPF-Amp (Gain: 0dB, HPF OFF)
Rev. 0.9
-7-
2000/09
AKM [ ASAHI KASEI MICROSYSTEMS ]
