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WIDE BANDWIDTH
QUAD J-FET OPERATIONAL AMPLIFIERS
.
LOW POWER CONSUMPTION
.
WIDE COMMON-MODE (UP TO V
CC
+
) AND
DIFFERENTIAL VOLTAGE RANGE
.
LOW INPUT BIAS AND OFFSET CURRENT
.
OUTPUT SHORT-CIRCUIT PROTECTION
.
HIGH INPUT IMPEDANCE J-FET INPUT
STAGE
.
INTERNAL FREQUENCY COMPENSATION
.
LATCH UP FREE OPERATION
.
HIGH SLEW RATE : 16V/
m
s (typ)
N
DIP14
(Plastic Package)
Inverting Input 2
Non-inverting Input 2
Non-inverting Input 1
CC
V
-
CC
V
1
2
3
4
8
5
6
7
9
10
11
12
13
14
+
Output 3
Output 4
Non-inverting Input 4
Inverting Input 4
Non-inverting Input 3
Inverting Input 3
-
+
-
+
-
+
-
+
Output 1
Inverting Input 1
Output 2
PIN CONNECTIONS
(top view)
DESCRIPTION
These circuits are high speed J-FET input quad opera-
tional amplifiers incorporating well matched, high
voltage J-FET and bipolar transistors in a monolithic
integrated circuit.
The devices feature high slew rates, low input bias and
offset currents, and low offset voltage temperature
coefficient.
D
SO14
(Plastic Micropackage)
LF147 - LF247
LF347
February 1996
ORDER CODES
Part
Number
Temperature
Package
N D
LF347 0
o
C, +70
o
C
w w
LF247 -40
o
C, +105
o
C
w w
LF147 -55
o
C, +125
o
C
w w
1/10
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
Supply Voltage - (note 1)
+
18 V
V
i
Input Voltage - (note 3)
+
15 V
V
id
Differential Input Voltage - (note 2)
+
30 V
P
tot
Power Dissipation 680 mW
Output Short-circuit Duration - (note 4) Infinite
T
oper
Operating Free Air Temperature Range LF347
LF247
LF147
0 to 70
-40 to 105
-55 to 125
o
C
T
stg
Storage Temperature Range -65 to 150
o
C
Notes : 1. All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the
zero reference level is the midpoint between V
CC
+
and V
CC
-
.
2. Differential voltages are at the non-inverting input terminal with respect to the inverting input terminal.
3. The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
4. The output may be shorted to ground or to either supply. Temperature and /or supply voltages must be limited to ensure that the
dissipation rating is not exceeded.
Output
Non-inverting
input
Inverting
input
V
CC
V
CC
200
W
W
10 0
W
10 0
1.3k
30k
35k
35k
W 10 0
1.3k
8.2k
SCHEMATIC DIAGRAM
(each amplifier)
LF147 - LF247 - LF347
2/10
ELECTRICAL CHARACTERISTICS
V
CC
=
+
15V, T
amb
= 25
o
C
(unless otherwise specified)
Symbol Parameter
LF147 - LF247
LF347
Unit
Min. Typ. Max.
V
io
Input Offset Voltage (R
S
= 10k
W
)
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
3 10
13
mV
DV
io
Input Offset Voltage Drift 10
m
V/
o
C
I
io
Input Offset Current *
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
5 100
4
pA
nA
I
ib
Input Bias Current *
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
20 200
20
pA
nA
A
vd
Large Signal Voltage Gain (R
L
= 2k
W
, V
O
=
+
10V)
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
50
25
200
V/mV
SVR Supply Voltage Rejection Ratio (R
S
= 10k
W
)
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
80
80
86
dB
I
CC
Supply Current, per Amp, no Load
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
1.4 2.7
2.7
mA
V
icm
Input Common Mode Voltage Range
+
11 +15
-12
V
CMR Common Mode Rejection Ratio (R
S
= 10k
W
)
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
70
70
86
dB
Ios Output Short-circuit Current
T
amb
= 25
o
C
T
min.
3
T
amb
3
T
max.
10
10
40 60
60
mA
+
V
OPP
Output Voltage Swing
T
amb
= 25
o
C R
L
= 2k
W
R
L
= 10k
W
T
min.
3
T
amb
3
T
max.
R
L
= 2k
W
R
L
= 10k
W
10
12
10
12
12
13.5
V
SR Slew Rate
(V
i
= 10V, R
L
= 2k
W,
C
L
= 100pF, T
amb
= 25
o
C, unity gain) 12 16
V/
m
s
t
r
Rise Time
(V
i
= 20mV, R
L
= 2k
W
, C
L
= 100pF, T
amb
= 25
o
C, unity gain) 0.1
m
s
K
OV
Overshoot
(V
i
= 20mV, R
L
= 2k
W
, C
L
= 100pF, T
amb
= 25
o
C, unity gain) 10
%
GBP Gain Bandwidth Product
(f = 100kHz, T
amb
= 25
o
C, V
in
= 10mV, R
L
= 2k
W
, C
L
=
100pF) 2.5 4
MHz
R
i
Input Resistance 10
12
W
THD Total Harmonic Distortion (f = 1kHz, A
V
= 20dB, R
L
= 2k
W
,
C
L
= 100pF, T
amb
= 25
o
C, V
O
= 2V
PP
) 0.01
%
e
n
Equivalent Input Noise Voltage (f = 1kHz, R
s
= 100
W
) 15
nV
/ ```
Hz
j
m Phase Margin 45 Degrees
V
O1
/V
O2
Channel Separation (A
v
= 100, T
amb
= 25
o
C) 120 dB
* The input bias currents are junction leakage currents which approximately double for every 10
o
C increase in the junction temperature.
LF147 - LF247 - LF347
3/10
30
20
25
15
10
5
0
MAXIMUM
PEAK-TO-PEAK
OUTPUT
VOLTAGE
(V)
100
1K 10K 100K 10M 1M
FREQUENCY (Hz)
See Figure 2
= 2k W
R
L
= +255C
T
a m b
=
15V V
CC
=
5V V
CC
=
10V V
CC
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREQUENCY
30
20
25
15
10
5
0
MAXIMUM
PEAK-TO-PEAK
OUTPUT
VOLTAGE
(V)
100
1K 10K 100K 10M 1M
FREQUENCY (Hz)
See Figure 2
= +25 C
T
amb
= 10k
W
R
L
V
CC
=
10V
V
CC
=
15V
V
CC
=
5V
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREQUENCY
30
25
20
15
10
5
0
MAXIMUM
PEAK-TO-PEAK
OUTPUT
VOLTAGE
(V)
FREQUENCY (Hz)
10k 40k 100k 400k 1M 4M 10M
T
amb
= +25 C
T
amb
= -55 C
T
amb
= +125 C
R
L
= 2k
W
See Figure 2
V
CC
= 15V
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREQUENCY
3 0
2 5
2 0
1 0
5
1 5
0
-75 -25 2 5 7 5 125 -50 0 5 0 -50
MAXIMUM
PEAK-TO-PEAK
OUTPUT
VOLTAGE
(V)
TEMPERATURE (5C)
V
C C
= 15V
See Figure 2
R
L
= 10k W
R
L
= 2k W
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREE AIR TEMP.
30
25
20
15
10
5
0
MAXIMUM
PEAK-TO-PEAK
OUTPUT
VOLTAGE
(V)
0.1 0.2 0.4 0.7 1 2 4 7 10
LOAD RESISTANCE ( k
W
)
T
amb
= +255C
V
CC
=
15V
See Figure 2
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS LOAD RESISTANCE
30
25
20
15
10
5
0 2 4 6 8 10 12 14 16
MAXIMUM
PEAK-TO-PEAK
OUTPUT
VOLTAGE
(V)
SUPPLY VOLTAGE (V)
R
L
= 10 k W
T
amb
= +255C
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS SUPPLY VOLTAGE
LF147 - LF247 - LF347
4/10
100
10
1
0.1
0.01
INPUT
BIAS
CURRENT
(nA)
-50 -25 0 25 50 75 100 125
TEMPERATURE (5C)
V
CC
=
15V
INPUT BIAS CURRENT VERSUS
FREE AIR TEMPERATURE
1000
400
200
100
20
40
10
4
2
1
DIFFERENTIAL
VOLTAGE
AMPLIFICATION
(V/V)
-75 -50 -25 0
25 50 75
100
125
TEMPERATURE (5C)
R
L
= 2k W
V
O
= 10V
V
CC
= 15V
LARGE SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION VERSUS
FREE AIR TEMPERATURE
FREQUENCY (Hz)
DIFFERENTIAL
VOLTAGE
AMPLIFICATION
(V/V)
100
10
100
1K 10K 100K 10M 1M
1
DIFFERENTIAL
VOLTAGE
AMPLIFICATION
(left scale)
180
90
0
R = 2k
W
C = 100pF
V = 15V
T = +125 C
L
L
CC
amb
PHASE SHIFT
(right scale)
LARGE SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE
SHIFT VERSUS FREQUENCY
250
225
200
175
150
125
100
75
50
25
0
TOTAL
POWER
DISSIPATION
(mW)
-75 -50 -25 0
25
50 75 100 125
TEMPERATURE (5C)
V
CC
=
15V
No signal
No load
TOTAL POWER DISSIPATION VERSUS
FREE AIR TEMPERATURE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
SUPPLY
CURRENT
(mA)
-75 -50 -25 0
25
50 75 100 125
TEMPERATURE (5C)
V
CC
=
15V
No signal
No load
SUPPLY CURRENT PER AMPLIFIER
VERSUS FREE AIR TEMPERATURE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
SUPPLY
CURRENT
(mA)
0 2 4 6
8
10 12 14 16
SUPPLY VOLTAGE (V)
No signal
No load
= +255C
T
a m b
SUPPLY CURRENT PER AMPLIFIER
VERSUS SUPPLY VOLTAGE
LF147 - LF247 - LF347
5/10
89
88
87
86
85
84
-50 -25 0 25 50 75 100 125
COMMON
MODE
MODE
REJECTION
RATIO
(dB)
TEMPERATURE (5C)
83
-75
R
L
= 10 k W
= 15V
V
C C
COMMON MODE REJECTION RATIO
VERSUS FREE AIR TEMPERATURE
6
4
2
0
-2
-4
0 0.5 1 1.5 2 2.5 3 3.5
INPUT
AND
OUTPUT
VOLTAGES
(V)
TIME (
m
s)
-6
= 15V
V
CC
R
L
= 2 k
W
= 100pF C
L
T
amb
= +25 C
OUTPUT
INPUT
VOLTAGE FOLLOWER LARGE SIGNAL
PULSE RESPONSE
t
r
28
24
20
16
12
8
4
0
-4
OUTPUT
VOLTAGE
(mV)
0 0.1 0.2
0.3
0.4
0.5
0.6
0.7
TIME (
m
s)
10%
90%
OVERSHOOT
R
L
= 2k W
T
amb
= +255C
V
CC
= 15V
OUTPUT VOLTAGE VERSUS
ELAPSED TIME
70
60
50
40
30
20
10
0
EQUIVALENT
INPUT
NOISE
VOLTAGE
(nV/VHz)
10 40 100 400 1k 4k 10k 40k 100k
FREQUENCY (Hz)
A
V
= 10
R
S
= 100 W
T
amb
= +255C
V
CC
= 15V
EQUIVALENT INPUT NOISE VOLTAGE
VERSUS FREQUENCY
1
0.4
0.1
0.04
0.01
0.004
0.001
TOTAL
HARMONIC
DISTORTION
(%)
100 400 1k 4k 10k 40k 100k
FREQUENCY (Hz)
A
V
= 1
T
amb
= +255C
V
CC
= 15V
= 6V
V
O
(rms)
A
V
= 1
T
amb
= +255C
= 6V
V
O
(rms)
V
CC
= 15V
TOTAL HARMONIC DISTORTION VERSUS
FREQUENCY
LF147 - LF247 - LF347
6/10
-
e
I
LF347
1/4
e
o
C
L
= 100pF
R = 2k
W
L
Figure 1 :
Voltage Follower
PARAMETER MEASUREMENT INFORMATION
-
e
I
LF347
R
L
1/4
C
L
= 100pF
1k W
10k W
e
o
Figure 2 :
Gain-of-10 Inverting Amplifier
-
L F 3 4 7
1/4
-
-
-
L F 3 4 7
1/4
LF3 4 7
1/4
L F 3 4 7
1/4
1 M
W
1 m F
Output A
Outp ut B
Outp ut C
I np ut
1 0 0 k W 1 0 0 k W
1 0 0 k
W
1 0 0 k W
1 O O m F
V
C C
+
f = 100kHz
O
TYPICAL APPLICATIONS
AUDIO DISTRIBUTION AMPLIFIER
LF147 - LF247 - LF347
7/10
-
-
LF347
1/4
220pF
43k W
Input
1.5k W
43k W
220pF
43k W
16k W
LF347
1/4
30k
W
Output A
-
LF347
1/4
1.5k W
220pF
43k W
220pF
43k W
-
LF347
1/4
43k W
16k W
30k W
Output B
Ground
TYPICAL APPLICATIONS
(continued)
POSITIVE FEEDBACK BANDPASS FILTER
CASCADED BANDPASS FILTER
fo = 100kHz ; Q = 69 ; Gain = 16
OUTPUT B
SECOND ORDER BANDPASS FILTER
fo = 100kHz ; Q = 30 ; Gain = 4
OUTPUT A
LF147 - LF247 - LF347
8/10
PACKAGE MECHANICAL DATA
14 PINS - PLASTIC DIP
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
a1 0.51 0.020
B 1.39 1.65 0.055 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 15.24 0.600
F 7.1 0.280
i 5.1 0.201
L 3.3 0.130
Z 1.27 2.54 0.050 0.100
LF147 - LF247 - LF347
9/10
PACKAGE MECHANICAL DATA
14 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.75 0.069
a1 0.1 0.2 0.004 0.008
a2 1.6 0.063
b 0.35 0.46 0.014 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.020
c1 45
o
(typ.)
D 8.55 8.75 0.336 0.334
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 7.62 0.300
F 3.8 4.0 0.150 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.020 0.050
M 0.68 0.027
S 8
o
(max.)
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsi-
bility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which
may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON
Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes
and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical
components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
{ 1996 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
LF147 - LF247 - LF347
10/10