GENNUM LD511

Class A
Compression Amplifier
LD511 DATA SHEET
FEATURES
DESCRIPTION
• 64 dB typical electrical gain
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 VDC bias
to the amplifier circuitry and to the microphone.
• 0.94 VDC voltage regulator
• 7 ms attack time, 40 ms release time
• 15 dB threshold adjustment
• low noise and distortion
The LD511, in compression, has approximately 15 dB of
threshold adjustment by varying RTH (see application circuit)
and a compression function ratio of ∞ : 1.
• compression ratio ∞ : 1
• 0.3 kHz - 6 kHz frequency response
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.
STANDARD PACKAGING
• 10 pin MICROpac
• 10 pin MINIpac
The output stage bias can be set to accommodate different
receiver impedances by changing the value of RE . The
voltage across RE (pin 2 to ground) is a constant 27 mV so the
bias current is 27 mV divided by the total value of RE in parallel
with 500 Ω.
• 10 pin PLID ®
• 10 pin SLT
• Chip (59 x 59 mils)
Au Bump
A OUT
B IN
VB
1
10
6
VOLTAGE
REGULATOR
VREG
7
20K
3
9
A IN
RIN
-A
10K
35K
-B
B OUT
RE
5
RECTIFIER
AGC
8
4
CAGC
GND
2
RE
All resistors in ohms, all capacitors
in farads unless otherwise stated
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: [email protected]
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION
PARAMETER
VALUE/UNITS
Supply Voltage
2.4 V DC
AGC
25 mW
GND
VREG
Operating Temperature Range
-10°C to 40° C
B OUT
CAGC
Storage Temperature Range
-20°C to 70° C
RE
Power Dissipation
5
6
VB
A IN
1
B IN
10
A OUT
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage VB = 1.3 VDC
PARAMETER
SYMBOL
Gain
AV
Input Referred Noise
IRN
Total Harmonic Distortion
THD
Amplifier Current
IAMP
Transducer Current
ITRANS
Input Impedance
RIN
Regulated Voltage
VREG
CONDITIONS
MIN
TYP
MAX
UNITS
60
64
68
dB
-
2.0
4.0
µV
-
1
3
%
COMPRESSION INACTIVE (S1 OPEN)
NFB 0.2 - 10kHz at 12 dB/oct
-
0.4
0.6
mA
1.35
1.6
2.0
mA
-
15
-
kΩ
0.90
0.96
1.0
VDC
On Chip Emitter Resistance
RE
-
500
-
Ω
Emitter Bias Voltage (pin 2)
VRE
-
27
-
mV
-
∞
-
dB
COMPRESSION ACTIVE (S1 CLOSED)
Compression Range
Total Harmonic Distortion
THDCOMP
V2 = 1 mV
-
4.0
7.0
%
Attack Time
TATT
V2 switched from 112µV to 2 mV
-
7
-
ms
Release Time
TREL
-
40
-
ms
Compression Output
VCOMPOUT
V2 = 1 mV
-
0.10
0.18
VRMS
Compression Output Change
∆V COMPOUT
V2 = 120 mV; Note 1
-
13
20
mVRMS
All parameters and switches remain as shown in Test Circuit unless otherwise stated in CONDITIONS column
Notes:
1. ∆VCOMPOUT = VOUT[V2 =120mV] - VCOMPOUT
0.033
VB=1.3 VDC
IAMP
RB
4.7
10
6
1
ITRANS
VOLTAGE
REGULATOR
V2
VOUT
0.068
RL
600
7
20K
3.9K
56K
9
3
-A
Hammond
99966
-B
10K
CS
0.047
35K
RE
S1
RS
50
5
RECTIFIER
56
27K
0.0047
8
10
4
2.2
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 1 Test Circuit
500 - 32 - 11
2
2
15
7
10
6
80
10K
20K
15K
3
9
32K
2
3.2K
500
4
5
8
All resistors in ohms, all capacitors
in farads unless otherwise stated
1
Fig. 2 Functional Schematic
VB=1.3 VDC
RVC
10K
0.1
10
6
1
VOLTAGE
REGULATOR
ED1913
7
20K
10
9
3
-A
10K
0.1
35K
-B
RTH
100K
RE
5
RECTIFIER
8
4
4.7n
2
2.2
0.068
47
All resistors in ohms, all capacitors
in farads unless otherwise stated
Fig. 3 LD511 Stand Alone Application Circuit
VB=1.3 VDC
RVC
10K
0.1
10
1.0
6
1
EP3075
VOLTAGE
REGULATOR
7
MPO
50K
20K
10
9
3
-A
10K
0.1
0.1
-B
35K
RTH
100K
RE
5
RECTIFIER
8
4
2.2
0.0047
2
All resistors in ohms, all capacitors
in farads unless otherwise stated
Fig. 4 LD511/Class D Application Circuit
3
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63
-0.1
62
VOLTAGE GAIN (dB)
REGULATOR VOLTAGE GAIN(dB)
0
-0.2
-0.3
-0.4
-0.5
0
10
20
30
40
50
60
70
80
90
61
60
59
58
100
0.8
0.9
1.0
BATTERY RESISTANCE (Ω)
Fig. 5 Voltage Gain vs Battery Resistance
1.3
1.4
1.5
1.6
1.7
REGULATOR VOLTAGE (VDC)
0.95
2.0
TOTAL CURRENT (mA)
1.2
Fig. 6 Voltage Gain vs Battery Voltage
2.5
1.5
1.0
0.5
0
0.93
0.91
0.89
0.87
0.85
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0.9
1.1
BATTERY VOLTAGE (V)
1.3
1.5
1.7
BATTERY VOLTAGE (V)
Fig. 8 Regulator Voltage vs Battery Voltage
Fig. 7 Total Current vs Battery Voltage
4
1000
RTH = ∞
500
2
RTH = 200k
CS = 47nF
0
200
-2
RTH = 100k
RELATIVE OUTPUT (dB)
OUTPUT VOLTAGE (mV)
1.1
BATTERY VOLTAGE (V)
100
RTH = 0k
50
20
10
5
-4
-6
CS = 22nF
-8
-10
CS = 10nF
-12
-14
-16
CS = 6.8nF
-18
2
-20
0.01
0.1
1.0
10
100
20
20k
FREQUENCY (Hz)
INPUT VOLTAGE (mV)
Fig. 10 Frequency Response at Various
CS Values
Fig. 9 Threshold Adjustment
GENNUM CORPORATION
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.
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
REVISION NOTES:
GENNUM JAPAN CORPORATION
Changes to standard packaging information
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.
500 - 32 - 11
4
Printed in Canada.