1/10
s
LOW POWER CONSUMPTION
s
WIDE COMMON-MODE (UP TO V
CC
+
) AND
DIFFERENTIAL VOLTAGE RANGE
s
LOW INPUT BIAS AND OFFSET CURRENT
s
OUTPUT SHORT-CIRCUIT PROTECTION
s
HIGH INPUT IMPEDANCE JFET INPUT
STAGE
s
INTERNAL FREQUENCY COMPENSATION
s
LATCH UP FREE OPERATION
s
HIGH SLEW RATE : 16V/
s (typ)
DESCRIPTION
These circuits are high speed JFET input quad
operational amplifiers incorporating well matched,
high voltage JFET and bipolar transistors in a
monolithic integrated circuit.
The devices feature high slew rates, low input bias
and offset currents, and low offset voltage tem-
perature coefficient.
ORDER CODE
N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part Number
Temperature Range
Package
N
D
LF147
-55C, +125C
LF247
-40C, +105C
LF347
0C, +70C
Example : LF347IN
N
DIP14
(Plastic Package)
D
SO14
(Plastic Micropackage)
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
LF147 - LF247
LF347
WIDE BANDWIDTH
QUAD J-FET OPERATIONAL AMPLIFIERS
March 2001
LF147 - LF247 - LF347
2/10
SCHEMATIC DIAGRAM (each amplifier)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
LF147
LF247
LF347
Unit
V
CC
Supply voltage - note
1)
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
-
.
18
V
V
i
Input Voltage - note
2)
2.
The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
15
V
V
id
Differential Input Voltage - note
3)
3.
Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.
30
V
P
tot
Power Dissipation
680
mW
Output Short-circuit Duration - note
4)
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
Infinite
T
oper
Operating Free-air Temperature Range
-55 to +125
-40 to +105
0 to +70
C
T
stg
Storage Temperature Range
-65 to +150
C
Output
Non-inverting input
Inverting input
V
CC
V
CC
200
W
W
100
W
100
1.3k
30k
35k
35k
W
100
1.3k
8.2k
LF147 - LF247 - LF347
3/10
ELECTRICAL CHARACTERISTICS
V
CC
= 15V, T
amb
= +25C (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
io
Input Offset Voltage (R
s
=
10k
)
T
amb
= 25C
T
min
T
amb
T
max
3
10
13
mV
DV
io
Input Offset Voltage Drift
10
V/C
I
io
Input Offset Current - note
1)
T
amb
= 25C
T
min
T
amb
T
max
1.
The input bias currents are junction leakage currents which approximately double for every 10C increase in the junction temperature.
5
100
4
pA
nA
I
ib
Input Bias Current - note 1
T
amb
= 25C
T
min
T
amb
T
max
20
200
20
pA
nA
A
vd
Large Signal Voltage Gain (R
L
= 2k
, V
o
= 10V)
,
T
amb
= 25C
T
min
T
amb
T
max
50
25
200
V/mV
SVR
Supply Voltage Rejection Ratio (R
S
=
10k
)
T
amb
= 25C
T
min
T
amb
T
max
80
80
86
dB
I
CC
Supply Current, Per Amp, no Load
T
amb
= 25C
T
min
T
amb
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
)
T
amb
= 25C
T
min
T
amb
T
max
70
70
86
dB
I
OS
Output Short-Circuit Current
T
amb
= 25C
T
min
T
amb
T
max
10
10
40
60
60
mA
V
opp
Output Voltage Swing
T
amb
= 25C
R
L
= 2k
R
L
= 10k
T
min
T
amb
T
max
R
L
= 2k
R
L
= 10k
10
12
10
12
12
13.5
V
SR
Slew Rate
V
i
= 10V, R
L
= 2k
, C
L
= 100pF, T
amb
= 25C, unity gain
12
16
V/
s
t
r
Rise Time
V
i
= 20mV, R
L
= 2k
,C
L
= 100pF, T
amb
= 25C, unity gain
0.1
s
K
ov
Overshoot
V
i
= 20mV, R
L
= 2k
, C
L
= 100pF, T
amb
= 25C, unity gain
10
%
GBP
Gain Bandwidth Product
f =100kHz, T
amb
= 25C, V
in
= 10mV, R
L
=2k
, C
L
= 100pF
2.5
4
MHz
R
i
Input Resistance
10
12
THD
Total Harmonic Distortion
f =1kHz, A
v
= 20dB, R
L
= 2k
, C
L
= 100pF
T
amb
= 25C, V
O
= 2Vpp
0.01
%
e
n
Equivalent Input Noise Voltage (R
S
=
100
,
f = 1KHz)
15
m
Phase Margin
45
Degrees
V
o1
/V
o2
Channel Separation ( A
v
= 100)
120
dB
nV
Hz
------------
LF147 - LF247 - LF347
4/10
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus LOAD RESISTANCE
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREE AIR TEMP.
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus SUPPLY VOLTAGE
30
25
20
15
10
5
0
2
4
6
8
10
12
14
16
M
A
XI
M
U
M
PE
A
K
-
T
O
-
PEA
K
O
U
T
P
U
T
VO
L
T
AG
E
(
V
)
R
L
= 10 k
T
amb
= +25C
SUPPLY VOLTAGE (
V)
LF147 - LF247 - LF347
5/10
INPUT BIAS CURRENT versus FREE AIR
TEMPERATURE
LARGE SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE SHIFT versus
FREQUENCY
SUPPLY CURRENT PER AMPLIFIER versus
FREE AIR TEMPERATURE
LARGE SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE SHIFT versus
FREQUENCY
TOTAL POWER DISSIPATION versus FREE AIR
TEMPERATURE
COMMON MODE REJECTION RATIO versus
FREE AIR TEMPERATURE
100
10
1
0.1
0.01
IN
P
U
T
B
I
A
S
CURR
E
N
T
(
n
A
)
-50
-25
0
25
50
75
100
125
TEMPERATURE (C)
V
CC
=
15V
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 = +125C
L
L
CC
amb
PHASE SHIFT
(right scale)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
S
U
P
P
L
Y
C
U
RRE
NT
(
m
A
)
-75
-50
-25
0
25
50
75
100
125
TEMPERATURE (C)
V
CC
= 15V
No signal
No load
1000
400
200
100
20
40
10
4
2
1
DIF
F
E
RE
NT
IA
L
V
O
L
T
A
G
E
A
M
P
L
IF
IC
A
T
IO
N (
V
/
V
)
-75
-50
-25
0
25
50
75
100
125
TEMPERATURE (C)
R
L
= 2k
V
O
= 10V
V
CC
= 15V
250
225
200
175
150
125
100
75
50
25
0
T
O
T
A
L
PO
W
E
R
D
I
SSI
PAT
I
O
N
(
m
W
)
-75
-50
-25
0
25
50
75
100
125
TEMPERATURE (C)
V
CC
= 15V
No signal
No load
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)
T
amb
= +25C
No signal
No load
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