5 4 3 2 1
- A
V
B
- C
6 7 8 9 10
- B
- D
GND
C
IN
C
OUT
D
IN
D
OUT
B
IN
B
OUT
A
IN
A
OUT
Low Current Quad
Inverting Amplifiers
LX509 - DATA SHEET
Document No. 510 - 30 - 06
FEATURES
210
A typical current drain
4 inverting opamps; B with 6 dB greater drive current
minimum 46 dB open loop gain
ideal for - active filtering
- dual channel hearing aids
- mixers
- microphone / telecoil preamps
BLOCK DIAGRAM
DESCRIPTION
The LX509 consists of 4 independent low noise, low current
inverting operational amplifiers utilizing Gennum's low voltage
bipolar JFET technology. Each amplifier has a minimum open
loop gain of 46 dB with the closed loop gain set by the ratio of
a feedback (R
F
) resistor to the source impedance (R
S
) . For
a well controlled gain tolerance from amplifier to amplifier, it is
recommended that the closed loop gain is at least 20 dB below
the open loop gain.
Three of the preamplifiers, A, C and D are capable of delivering
typically 30
A of peak current drive while the fourth pre-
amplifier B has 6 dB more current drive capability, allowing a
6 dB greater output into the same load impedance, or the same
output level into one half the load impedance.
Revision Date: January 2001
STANDARD PACKAGING
10 pin PLID
10 pin SLT
Chip (61 x 55 mils)
Au Bump
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
510 - 30 - 06
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Total Current
I
TOT
115
210
305
A
Input Bias Voltage
V
BIAS
500
570
620
mVDC
Input Bias Current
I
BIAS
R
F
= 1 M
-50
0
50
nA
Output Voltage Swing - Hi
V
OH
V
IN
= 0.4 VDC
'
R
F
=
200
580
-
mVDC
I
L
= -10
A, (Note 1)
Output Voltage Swing - Lo
V
OL
I
IN
= +1
A
'
R
F
=
200
280
-
mVDC
I
L
= +10
A, (Note 2)
Open Loop Voltage Gain
A
VOL
46
56
-
dB
Input Referred Noise
IRN
NFB 0.2 to 10kHz at 12dB/Oct
-
1
-
V
RMS
Harmonic Distortion
THD
-
1
-
%
Current Drive
A, C, D,
-
30
-
A
Capability
B
-
60
-
A
All Parameters and Switches remain as shown in Test Circuit unless otherwise stated in "Conditions" Column
Notes:
1
V
OH
= V
OUT
- V
OUT
(
I
L
= -10
A for Blocks A, C, D,
I
L
= -20
A for Block B)
2
V
OL
= V
OUT
- V
OUT
(
I
L
= +10
A for Blocks A, C, D,
I
L
= +20
A for Block B)
5
10
1
6
PIN CONNECTION
B IN
B OUT
A IN
A OUT
GND
C IN
C OUT
V
B
D IN
D OUT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE / UNITS
Supply Voltage
5V DC
Operating Temperature
-10
o
to +40
o
C
Storage Temperature
-20
o
to +70
o
C
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
V
OUT
Pin voltage measured with conditions as shown in Test Circuit
Positive Current corresponds to current INTO the pin
Negative Current corresponds to current OUT of the pin
Conditions: Frequency = 1 kHz, Temperature = 25
o
C, Supply Voltage V
B
= 1.3 VDC
V
OUT
V
IN
3.92k
180
V
RMS
at 1kHz
1.0
I
L
= 0
C
S
R
S
R
F
= 0
S1
a
b
-A to -D
Fig. 1 LX509 Test Circuit
All resistors in ohms, all capacitors in
F unless otherwise stated
3
510 - 30 - 06
R10
C1
R12
R11
C11
C10
- B
V1
- A
High Pass
R2
V
O
C1
- D
R9
C4
R5
C2
C9
V2
- C
Band Pass
R4
C3
R8
C7
C5
R1
C8
V3
Low Pass
C6
R7
R3
R6
- C
4.7k
C1
V2
T
- A
R2
V
O
C2
R
IN
1
4.7k
- B
V1
R3
R
IN
2
R
F
2
R
F
1
10
9
2
8
4
7
1
6
5
BASE
CURRENT
COMPENSATION
3
Fig. 3a Summing Amplifier
V3
V2
- A
V
O
R1
V1
R3
R2
R
F
Fig. 3b Mixing Circuit
- C
R1
C1
TELE
COIL
- B
T
- A
R2
V
O
C2
R
F
C4
M
C3
MIC
R3
Fig. 3c Mic / Telecoil Preamplifier
Fig. 3 LX509 Application Circuits
Fig. 3d Multi-Band Filtering
(for Filter Design refer to Note 600-9, Active Filtering for Hearing Aids)
All resistors in ohms, all capacitors in
F unless otherwise stated
Fig. 2 Functional Schematic
4
510 - 30 - 06
C
S
= 0.1
4
0
-4
-8
-12
-16
-20
Fig. 5 Closed Loop Frequency Response
for Various C
S
Values
C
S
= 0.22
RELATIVE OUTPUT (dB)
C
S
= 0.033
C
S
= 0.047
60
55
50
45
40
35
30
25
20
10 100 1k 10k 100k
FREQUENCY (Hz)
Fig. 7 Preamplifier Open Loop Frequency
Response
GAIN (dB)
20 200 2k 20k
FREQUENCY (Hz)
0
-20
-40
-60
-80
-100
-120
-20 -10 0 10 20 30 40 50
TEMPERATURE (
o
C)
-130
-110
-90
-70
-50
-30 -10
INPUT (dBV)
OUTPUT (dBV)
Fig. 4 I/O Characteristics for
Various R
F
Values
R
F
= 10k
R
F
= 3.3k
R
F
= 22k
R
F
= 47k
R
F
= 100k
RELATIVE GAIN (dB)
RELATIVE TOTAL CURRENT (
A)
0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
SUPPLY VOLTAGE (V)
Fig.8 Total Current vs Temperature
Fig. 6 Gain vs Supply Voltage
4
0
-4
-8
-12
-16
-20
40
20
0
-20
-40
-60
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 July 1988 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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