Japan Branch: A-302, M i yamae Vi l l age, 2–10–42 M i yamae, Suginami–ku Tokyo 168, Japan
tel. (905) 632-2996 fax: (905) 632-5946
tel. (03) 3334-7700
fax (03) 3247-8839
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power dissipation
Operating Temperature
Storage Temperature
VALUE & UNITS
3V
25 mW
-10 to +40
°C
-20 to +70
°C
PIN CONNECTION
V
B
O/P
R
E
MPO
4
5
R
VC
I/P
GND
1
8
V
MIC
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25
o
C, Supply Voltage V
B
= 1.55 VDC
PARAMETER
Gain
Temperature Coefficient of Gain
Amplifier Current
Temperature Coefficient of Current
Transducer Current
Total Harmonic Distortion
Input Referred Noise
Battery Resistance Stability
Volume Control Range
Input Impedance (Pin 6)
Frequency Response (-3 dB)
SYMBOL
A
CL
η
A
I
AMP
η
Ι
I
TRANS
THD
IRN
CONDITION
V
O
= 0.707 V
RMS
MIN
68
-
180
-
1.3
TYP
72
0.07
210
-0.002
1.5
2
1.2
-
43
27
100
5K
0.19
0.16
42.5
MAX
76
-
280
-
1.9
5
2.0
22
-
-
-
-
0.275
-
-
UNITS
dB
dB/
o
C
µA
mA/
o
C
mA
%
µV
RMS
Ω
dB
kΩ
Hz
Hz
V
RMS
dB/Ω
mV
V
O
= 0.707 V
RMS
NFB 0.2 to 10 kHz at 12 dB/oct
R
B
= 22Ω
R
VC
= 100 to 100.1 kΩ S1 open
-
-
-
36
-
R
IN
Low
High
-
-
0.125
-
Maximum Output
Gain Dependence of RB
Emitter Bias Voltage (Pin 2)
V
RE
S2 closed
-
All switches and parameters remain as shown in test circuit unless stated in condition column
500 - 20 - 11
2
R
B
= 4.7
V
B
= 1.5 VDC
10
+
+
V
O
10
S2
1k
8
R
S
3.9k
0.033
+
6
-
S1
100
100k
+
10
100
5
2.2k
4
1
3
I
L
33k
200
7
2
R
E
33
All resistors in ohms, all capacitors in
µF
unless otherwise stated
Fig. 1 Test Circuit
VB
4
2.2k
MPO
V
MIC
8
30k
27k
OUTPUT
INPUT
6
100
33k
2
RE
3
1
VOLUME
CONTROL
200
5
GND
7
All resistors in ohms, all capacitors in farads unless otherwise stated
U.S. Patent No. 4,034,306 - Patented in other countries
Fig. 2 Functional Schematic
3
500 - 20 - 11
C
MPO
+
10
1.0
8
2.2k
6
0.033
100
R
VC
100k
5
-
33k
200
4
1
R
MPO
10k
V =1.35VDC
B
1k
3
+
LS505
LS505
+
10
7
2
R
E
56
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 3 Typical Hearing Aid Applications
47
46
7
6
5
4
VOLUME CONTROL RANGE (dB)
45
44
43
42
41
40
10
gm (
50
100
500
1k
5k
10k
)
Ω
3
2
1
0
10
50
100
500
1k
5k
10k
EXTERNAL RESISTANCE (Ω)
R
E
Ω
Fig. 5 GM
vs R
E
Ω
Ω
Fig. 4 Volume Control Range vs R
E
3.5
3.0
130
DIODES
DISCONNECTED
120
LOAD CURRENT
I
(mA)
2.5
OUTPUT (dBSPL)
50
100
500
1k
5kk
10k
L
2.0
1.5
1.0
0.5
0
10
110
100
90
80
30
40
50
60
70
80
90
100
110
EXTERNAL RESISTANCE R
E
(Ω)
INPUT (dBSPL)
Fig. 6 Load Current vs External Resistance
Fig. 7 I/O Characteristics
500 - 20 - 11
4
0
6
RELATIVE VOLTAGE GAIN (dB)
-10
RELATIVE VOLTAGE GAIN (dB)
10
100
1k
10k
5
-20
4
-30
3
-40
2
-50
1
1
10
100
R
VC
(Ω)
BATTERY RESISTANCE R (Ω)
B
Fig. 8 Relative Voltage Gain vs
Volume Control Resistance
Fig. 9 Relative Voltage Gain vs
Battery Resistance
250
2.5
AMPLIFIER CURRENT (µA)
150
LOAD CURRENT
I
(mA)
200
2.0
L
1.5
1.0
0.5
0
100
50
0
0.8
1.0
1.2
1.4
1.6
1.8
0.8
1.0
1.2
1.4
1.6
1.8
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Fig. 10 Amplifier Current vs Supply Voltage
Fig. 11 Load Current vs Supply Voltage
74
72
GAIN (dB)
70
68
66
64
0.8
1.0
1.2
1.4
1.6
1.8
SUPPLY VOLTAGE (V)
Fig. 12 Gain vs Supply Voltage
REVISION NOTES
Au bump removed
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
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