Class A
Compression Amplifier
LD511 DATA SHEET
FEATURES
•
64 dB typical electrical gain
•
0.94 V
DC
voltage regulator
•
7 ms attack time, 40 ms release time
•
15 dB threshold adjustment
•
low noise and distortion
•
compression ratio
∞
: 1
•
0.3 kHz - 6 kHz frequency response
DESCRIPTION
The LD511 is a Class A compression amplifier which can
operate over a range of
DC
battery voltages from 1.1 V
to 2.4 V. A voltage regulator, which is independent of supply
voltage variations, is on-chip to supply a stable 0.94 V
DC
bias
to the amplifier circuitry and to the microphone.
The LD511, in compression, has approximately 15 dB of
threshold adjustment by varying
R
TH
(see application circuit)
and a compression function ratio of
∞
: 1.
Minimum attack and release times are fixed at 7 ms and 40 ms
respectively and they can be adjusted simultaneously by
changing the filter capacitor on pin 8, although the ratio of
attack to release time is kept constant.
The output stage bias can be set to accommodate different
receiver impedances by changing the value of
R
E
. The
voltage across
R
E
(pin 2 to ground) is a constant 27 mV so the
bias current is 27 mV divided by the total value of
R
E
in parallel
with 500
Ω.
STANDARD PACKAGING
• 10 pin MICROpac
• 10 pin MINIpac
• 10 pin PLID
®
• 10 pin SLT
• Chip (59 x 59 mils)
Au Bump
A OUT
10
B IN
1
VB
6
VOLTAGE
REGULATOR
V
REG
7
20K
9
3
A IN
R
IN
-A
10K
35K
-B
B OUT
R
E
5
RECTIFIER
8
4
2
AGC
C
AGC
All resistors in ohms, all capacitors
in farads unless otherwise stated
GND
R
E
BLOCK DIAGRAM
Revision Date: January 2001
500 - 32 - 11
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996
Web Site: www.gennum.com E-mail: hipinfo@gennum.com
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
VALUE/UNITS
2.4 V DC
25 mW
-10°C to 40° C
-20°C to 70° C
AGC
GND
B OUT
R
E
B IN
PIN CONNECTION
5
6
V
B
V
REG
C
AGC
A IN
1
10
A OUT
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
PARAMETER
Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage V
B
= 1.3 VDC
SYMBOL
CONDITIONS
COMPRESSION INACTIVE (S1 OPEN)
MIN
TYP
MAX
UNITS
Gain
Input Referred Noise
Total Harmonic Distortion
Amplifier Current
Transducer Current
Input Impedance
Regulated Voltage
On Chip Emitter Resistance
Emitter Bias Voltage (pin 2)
A
V
IRN
THD
I
AMP
I
TRANS
R
IN
V
REG
R
E
V
RE
COMPRESSION ACTIVE (S1 CLOSED)
NFB 0.2 - 10kHz at 12 dB/oct
60
-
-
-
1.35
-
0.90
-
-
64
2.0
1
0.4
1.6
15
0.96
500
27
68
4.0
3
0.6
2.0
-
1.0
-
-
dB
µV
%
mA
mA
kΩ
VDC
Ω
mV
Compression Range
Total Harmonic Distortion
Attack Time
Release Time
Compression Output
Compression Output Change
THD
COMP
T
ATT
T
REL
V
COMPOUT
∆V
COMPOUT
V
2
= 1 mV
V
2
= 120 mV; Note 1
V
2
= 1 mV
V
2
switched from 112µV to 2 mV
-
-
-
-
-
-
∞
4.0
7
40
0.10
13
-
7.0
-
-
0.18
20
dB
%
ms
ms
V
RMS
mV
RMS
All parameters and switches remain as shown in Test Circuit unless otherwise stated in CONDITIONS column
Notes:
1.
∆V
COMPOUT
= V
OUT
[V
2
=120mV] - V
COMPOUT
0.033
I
AMP
R
B
4.7
10
1
6
V
B
=1.3 VDC
I
TRANS
0.068
R
L
600
3
VOLTAGE
REGULATOR
V2
7
V
OUT
20K
56K
3.9K
C
S
0.047
R
S
50
RECTIFIER
56
27K
0.0047
8
4
2
9
-A
10K
35K
-B
Hammond
99966
R
E
5
S1
10
2.2
15
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 1 Test Circuit
500 - 32 - 11
2
7
10
6
80
10K
20K
15K
3
9
32K
2
3.2K
500
4
8
5
1
All resistors in ohms, all capacitors
in farads unless otherwise stated
Fig. 2 Functional Schematic
VB=1.3 VDC
RVC
10K
10
VOLTAGE
REGULATOR
7
10
9
0.1
20K
0.1
1
6
ED1913
-A
10K
35K
3
-B
RTH
100K
5
4
2
47
4.7n
0.068
RE
RECTIFIER
8
2.2
All resistors in ohms, all capacitors
in farads unless otherwise stated
Fig. 3 LD511 Stand Alone Application Circuit
VB=1.3 VDC
RVC
10K
10
VOLTAGE
REGULATOR
7
10
9
0.1
20K
MPO
50K
3
10K
35K
0.1
1
6
1.0
EP3075
0.1
-A
-B
RE
RTH
100K
5
4
0.0047
2
All resistors in ohms, all capacitors
in farads unless otherwise stated
RECTIFIER
8
2.2
Fig. 4 LD511/Class D Application Circuit
3
500 - 32 - 11
0
63
REGULATOR VOLTAGE GAIN(dB)
-0.1
62
-0.2
VOLTAGE GAIN (dB)
0
10
20
30
40
50
60
70
80
90
100
61
-0.3
60
-0.4
59
-0.5
58
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
BATTERY RESISTANCE (Ω)
BATTERY VOLTAGE (V)
Fig. 5 Voltage Gain vs Battery Resistance
2.5
0.95
Fig. 6 Voltage Gain vs Battery Voltage
2.0
REGULATOR VOLTAGE (VDC)
TOTAL CURRENT (mA)
0.93
1.5
0.91
1.0
0.89
0.5
0.87
0
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0.85
0.9
1.1
1.3
1.5
1.7
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
Fig. 7 Total Current vs Battery Voltage
1000
500
4
Fig. 8 Regulator Voltage vs Battery Voltage
R
TH
=
∞
R
TH
= 200k
R
TH
= 100k
R
TH
= 0k
2
0
C
S
= 47nF
OUTPUT VOLTAGE (mV)
200
100
50
20
10
5
2
0.01
0.1
1.0
-2
RELATIVE OUTPUT (dB)
-4
-6
-8
-10
-12
-14
-16
-18
-20
C
S
= 22nF
C
S
= 10nF
C
S
= 6.8nF
10
100
20
20k
INPUT VOLTAGE (mV)
FREQUENCY (Hz)
Fig. 9 Threshold Adjustment
Fig. 10 Frequency Response at Various
C
S
Values
GENNUM CORPORATION
MAILING ADDRESS:
P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814
SHIPPING ADDRESS:
970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5
DOCUMENT IDENTIFICATION:
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:
Changes to standard packaging information
GENNUM JAPAN CORPORATION
C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081,
Japan
Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839
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 November 1980 Gennum Corporation.
All rights reserved.
Printed in Canada.
500 - 32 - 11
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