LD511 DATA SHEET
Class A
Compression Amplifier
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
.
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
STANDARD PACKAGING
10 pin MICROpac
10 pin MINIpac
10 pin PLID
10 pin SLT
Chip (59 x 59 mils)
Au Bump
BLOCK DIAGRAM
VOLTAGE
REGULATOR
10K
35K
RECTIFIER
B OUT
AGC
GND
C
AGC
A IN
V
REG
A OUT
B IN
VB
9
7
10
1
6
3
5
2
4
8
20K
R
E
- B
- A
R
IN
R
E
500 - 32 - 11
All resistors in ohms, all capacitors
in farads unless otherwise stated
Revision Date: January 2001
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
2
500 - 32 - 11
V
B
V
REG
C
AGC
A IN
A OUT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE/UNITS
Supply Voltage
2.4 V DC
Power Dissipation
25 mW
Operating Temperature Range
-10
C to 40
C
Storage Temperature Range
-20
C to 70
C
PIN CONNECTION
AGC
GND
B OUT
R
E
B IN
5
10
1
6
Fig. 1 Test Circuit
56
27K
3.9K
56K
V2
R
S
50
10
2.2
C
S
0.047
15
0.0047
S1
Hammond
99966
R
L
600
V
OUT
V
B
=1.3 VDC
R
B
4.7
I
TRANS
0.033
VOLTAGE
REGULATOR
RECTIFIER
- B
10K
35K
7
9
8
4
2
5
3
6
1
10
I
AMP
- A
R
E
20K
0.068
CAUTION
CLASS 1 ESD SENSITIVITY
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
COMPRESSION INACTIVE (S1 OPEN)
Gain
A
V
60
64
68
dB
Input Referred Noise
IRN
NFB 0.2 - 10kHz at 12 dB/oct
-
2.0
4.0
V
Total Harmonic Distortion
THD
-
1
3
%
Amplifier Current
I
AMP
-
0.4
0.6
mA
Transducer Current
I
TRANS
1.35
1.6
2.0
mA
Input Impedance
R
IN
-
15
-
k
Regulated Voltage
V
REG
0.90
0.96
1.0
VDC
On Chip Emitter Resistance
R
E
-
500
-
Emitter Bias Voltage (pin 2)
V
RE
-
27
-
mV
COMPRESSION ACTIVE (S1 CLOSED)
Compression Range
-
-
dB
Total Harmonic Distortion
THD
COMP
V
2
= 1 mV
-
4.0
7.0
%
Attack Time
T
ATT
V
2
switched from 112
V to 2 mV
-
7
-
ms
Release Time
T
REL
-
40
-
ms
Compression Output
V
COMPOUT
V
2
= 1 mV
-
0.10
0.18
V
RMS
Compression Output Change
V
COMPOUT
V
2
= 120 mV; Note 1
-
13
20
mV
RMS
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25
C, Supply Voltage V
B
= 1.3 VDC
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
All resistors in ohms, all capacitors in farads unless otherwise stated
3
500 - 32 - 11
2.2
0.0047
VB=1.3 VDC
VOLTAGE
REGULATOR
RECTIFIER
7
9
8
4
2
5
3
6
1
10
0.1
10
RVC
10K
0.1
1.0
EP3075
0.1
MPO
50K
RTH
100K
20K
- A
- B
RE
10K
35K
80
15K
10K
32K
3.2K
500
20K
4
2
3
6
10
7
9
8
5
1
2.2
4.7n
VB=1.3 VDC
- A
RECTIFIER
- B
7
9
8
4
2
5
3
6
1
10
0.1
10
RVC
10K
0.1
ED1913
0.068
RTH
100K
20K
RE
47
VOLTAGE
REGULATOR
10K
35K
Fig. 2 Functional Schematic
Fig. 3 LD511 Stand Alone Application Circuit
Fig. 4 LD511/Class D Application Circuit
All resistors in ohms, all capacitors
in farads unless otherwise stated
All resistors in ohms, all capacitors
in farads unless otherwise stated
All resistors in ohms, all capacitors
in farads unless otherwise stated
4
500 - 32 - 11
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
Fig. 8 Regulator Voltage vs Battery Voltage
R
TH
=
BATTERY RESISTANCE (
)
Fig. 5 Voltage Gain vs Battery Resistance
BATTERY VOLTAGE (V)
Fig. 7 Total Current vs Battery Voltage
OUTPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
BATTERY VOLTAGE (V)
Fig. 6 Voltage Gain vs Battery Voltage
R
TH
= 200k
R
TH
= 100k
R
TH
= 0k
0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
0 10 20 30 40 50 60 70 80 90 100
0
-0.1
-0.2
-0.3
-0.4
-0.5
2.5
2.0
1.5
1.0
0.5
0
TOTAL CURRENT (mA)
0.01 0.1 1.0 10 100
1000
500
200
100
50
20
10
5
2
Fig. 9 Threshold Adjustment
FREQUENCY (Hz)
0.9 1.1 1.3 1.5 1.7
BATTERY VOLTAGE (V)
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7
63
62
61
60
59
58
0.95
0.93
0.91
0.89
0.87
0.85
20
20k
C
S
= 47nF
C
S
= 10nF
C
S
= 6.8nF
C
S
= 22nF
RELATIVE OUTPUT (dB)
Fig. 10 Frequency Response at Various
C
S
Values
REGULATOR VOLTAGE GAIN(dB
)
VOLTAGE GAIN (dB)
REGULATOR VOLTAGE (VDC
)
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.
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.
REVISION NOTES:
Changes to standard packaging information
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
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
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