ETC LD505 High gain class a amplifier Datasheet

GENNUM
C
O
R
P
O
R
A
T
I
O
High Gain Class A Amplifier
N
LC505/LD505 DATA SHEET
FEATURES
DESCRIPTION
• 71 dB of gain with 1.3 V supply
The LC/LD505 are low voltage, linear monolithic integrated
amplifiers with a typical electrical gain of 71 dB. The circuits
are comprised of a compensated, unconditionally stable,
operational amplifier and a low distortion Class A single
transistor output stage with negative feedback for stability
over a wide temperature range.
D
E
D
S
N
E GN
M SI
M
E
O
D
C
E
R EW
T
N
O
N OR
F
• 0.2 to 2.0 mA of transducer current adjustment
• 43 dB of volume control range
• 1.0 to 1.6 V supply operating range
• 2.2 kΩ internal decoupling resistor for microphone
bias (LD505 only)
• output limiting capabilities (LD505 only)
STANDARD PACKAGING
Current trimming in the output stage for inductive or resistive
loads can be accomplished by connecting an emitter resistor
from RE to ground. The LC/LD505 can operate over a supply
voltage range of 1.0 to 1.6 DC.
The LD505 which is an eight pin device, has an internal 2.2 kΩ
decoupling resistor for microphone bias providing increased
supply line rejection. The base of the output transistor is also
accessible allowing connection of diodes in a feedback
configuration for peak limiting.
• MINIpac P6 (LC505)
• MINIpac P8 (LD505)
VB
8
3
OUT
+
3
OUT
+
6
-
-
33k
VC
1
2.2k
IN
5
LIMITER
4
2
IN
VB
MICBIAS
33k
100
4
VC
6
200
GND
All resistors in ohms, all capacitors in
microfarads unless otherwise stated
LC505 BLOCK DIAGRAM
1
100
5
7
RE
2
200
RE
GND
All resistors in ohms, all capacitors in
microfarads unless otherwise stated
LD505 BLOCK DIAGRAM
Revision Date: January 1996
1
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3
Japan Branch: A-302, M i yamae Vi l l age, 2–10–42 M i yamae, Sugi nami–ku, Tokyo 168, Japan
Document No. 500 - 15 - 09
500 - 15 - 09
tel. (905) 632-2996 fax: (905) 632-5946
tel. (03) 3334-7700
fax (03) 3247-8839
PIN CONNECTION
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE & UNITS
Supply Voltage
VB
4
3
VC
3V
Power dissipation
IN
OUT
-10 to +40 °C
Operating Temperature
1
RE
25 mW
6
GND
LC505
CAUTION
CLASS 1 ESD SENSITIVITY
V
B
5
4
OUT
IN
R
E
LIMITER
VC
GND
1
8
MIC
BIAS
LD505
ELECTRICAL CHARACTERISTICS
All switches remain as shown in test circuit unless stated in condition column
Conditions: Temperature 25 o C, V = 1.55 V
cc
PARAMETER
SYMBOL
MIN
TYP
MAX
68
72
76
dB
66
71
76
dB
-
0.07
-
-
0.21
0.28
mA
-
0.16
0.23
mA
-
-0.002
-
1.3
1.5
1.9
mA
1.0
1.3
1.7
mA
-
2
5
%
Vcc = 1.3 V
-
-
6
%
Input Referred Noise
Bandwidth at 12 dB/OCT - 0.2 to 10 kHz
-
1.2
2.0
Battery Resistance Stability
RVC = 100k (S1-open)
22
-
-
Ω
Gain
AV
Temperature Coefficient of Gain
ηA
Amplifier Current
IA
Temperature Coefficient of Current
ηΙ
Transducer Current
I
L
CONDITIONS
VCC = 1.3 V
Vcc = 1.3 V
Vcc = 1.3 V
UNITS
dB/oC
mA/ oC
Total Harmonic Distortion
Input Impedance
Frequency Response (-3 dB)
Volume Control Range
µVRMS
LC505
-
8
-
kΩ
LD505
-
27
-
kΩ
Low
-
100
-
Hz
High
-
5000
-
Hz
R VC = 0 to 100kΩ
36
43
-
dB
(S1 - closed/open)
R VC = 0 to 100kΩ
34
42
-
dB
(S1 - closed/open) Vcc = 1.3 V
Gain Dependance of RB
500 - 15 - 09
LC505
-
-0.4
-
dB/Ω
LD505
-
+0.16
-
dB/Ω
2
RB = 4.7
IA
VB = 1.5 VDC
VO
3
1k
RS
3.9k
2
0.33 5
+
IL
S1
1kHz
33k
4
100
200
+ 100k
10
1
6
RE
33
All resistors in ohms, all capacitors in microfarads unless otherwise stated
Fig. 1 LC505 Test Circuit
RB = 4.7
IA
10
+
VB = 1.5 VDC
VO
8
4
1
1k
2.2k
RS
3.9
3
0.033 6
+
IL
S1
1kHz
33 k
5
+ 100k
10
100
200
100
2
7
RE
33
All resistors in ohms, all capacitors in microfarads unless otherwise stated
Fig. 2 LD505 Test Circuit
VB
2.2k
LIMITER
(LD ONLY)
MIC BIAS
(LD ONLY)
30k
27k
OUTPUT
INPUT
100
RE
33k
VOLUME
CONTROL
200
GND
All resistors in ohms, all capacitors in microfarads unless otherwise stated
Fig. 3 Equivalent Circuit
3
500 - 15 - 09
I (mA)
IL (µA)
L
3
200
2
100
1
0
10
100
1k
0.8
10k
1.0
1.2
1.4
1.6
1.8
VB (V)
RE (Ω)
Fig. 4 Load Current vs Emitter Resistor
Fig. 5 Amplifier Current vs Supply Voltage
AV (dB)
IL (mA)
74
2
72
70
1
68
66
0
0.8
1.0
1.2
V (V)
B
1.4
1.6
64
1.8
0.8
Fig. 6 Load Current vs Supply Voltage
1.0
1.2
1.4
V B (V)
1.6
1.8
Fig. 7 Absolute Voltage Gain vs Supply Voltage
AV (dB)
A (dB)
V
0
6
4.8
-20
3.6
2.4
-40
1.2
0
10
100
1k
10k
1
RVC (Ω)
5
10
R B (Ω)
20
Fig. 9 Relative Voltage Gain vs
Battery Resistance
Fig. 8 Relative Voltage Gain vs
Volume Control Resistance
500 - 15 - 09
2
4
50
100
g (mV)
VCR (dB)
m
46
6
44
4
42
2
40
10
100
1k
0
10k
10
R (Ω)
100
E
Fig. 11 Transductance vs Emitter Resistor
VB =1.35
Vcc
2.2 k
+
10
VB =1.35
Vcc
10
1k
1k
3
5
0.33
0.333
1
100 k
LD505
1
7
2
5
6
+
3
6
LC505
+
4
8
2
4
10k
E
Fig. 10 Volume Control Range vs Emitter Resistor
+
1k
R (Ω)
10
10k
MAXIMUM
OUTPUT
CONTROL
100k
33
33
+ 10
10
All resistors in ohms, all capacitors in microfarads unless otherwise stated
All resistors in ohms, all capacitors in microfarads unless otherwise stated
Fig. 13 LD505 Typical Hearing Aid Application
Fig. 12 LC505 Typical Hearing Aid Application
DOCUMENT
IDENTIFICATION
PRODUCT PROPOSAL
This data has been compiled for market investigation purposes
only, and does not constitute an offer for sale.
ADVANCE INFORMATION NOTE
This product is in development phase and specifications are
subject to change without notice. Gennum reserves the right to
remove the product at any time. Listing the product does not
constitute an offer for sale.
PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications are
subject to change without notice.
DATA SHEET
The product is in production. Gennum reserves the right to make
changes at any time to improve reliability, function or design, in
order to provide the best product possible.
REVISION NOTES:
Chip information 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.
© Copyright March 1976 Gennum Corporation. All rights reserved. Printed in Canada.
5
500 - 15 - 09
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