LF347, LF347B
JFET-INPUT
QUAD OPERATIONAL AMPLIFIERS
SLOS013B MARCH 1987 REVISED AUGUST 1994
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Low Input Bias Current . . . 50 pA Typ
D
Low Input Noise Current
0.01 pA/
Hz Typ
D
Low Total Harmonic Distortion
D
Low Supply Current . . . 8 mA Typ
D
Gain Bandwidth . . . 3 MHz Typ
D
High Slew Rate . . . 13 V/
s Typ
D
Pin Compatible With the LM348
description
These devices are low-cost, high-speed, JFET-input operational amplifiers. They require low supply current yet
maintain a large gain-bandwidth product and a fast slew rate. In addition, their matched high-voltage JFET
inputs provide very low input bias and offset current.
The LF347 and LF347B can be used in applications such as high-speed integrators, digital-to-analog
converters, sample-and-hold circuits, and many other circuits.
The LF347 and LF347B are characterized for operation from 0
C to 70
C.
symbol (each amplifier)
+
IN
IN +
OUT
AVAILABLE OPTIONS
VIOmax
PACKAGE
TA
VIOmax
AT 25
C
SMALL OUTLINE
(D)
PLASTIC DIP
(N)
0
C to 70
C
10 mV
LF347D
LF347N
0
C to 70
C
5 mV
LF347BD
LF347BN
The D packages are available taped and reeled. Add R suffix to the device
type (e.g., LF347DR).
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC +
18 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage
,
V
CC
18 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage, V
ID
30 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
(see Note 1)
15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duration of output short circuit
unlimited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating temperature range
0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE 1: Unless otherwise specified, the absolute maximum negative input voltage is equal to the negative power supply voltage.
Copyright
1994, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1OUT
1IN
1IN +
V
CC +
2IN +
2IN
2OUT
4OUT
4IN
4IN +
V
CC
3IN +
3IN
3OUT
D OR N PACKAGE
(TOP VIEW)
LF347, LF347B
JFET-INPUT
QUAD OPERATIONAL AMPLIFIERS
SLOS013B MARCH 1987 REVISED AUGUST 1994
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DISSIPATION RATING TABLE
PACKAGE
TA
25
C
POWER RATING
DERATING
FACTOR
DERATE
ABOVE TA
TA = 70
C
POWER RATING
D
N
608 mW
680 mW
7.6 mW/
C
N/A
61
C
N/A
608 mW
680 mW
recommended operating conditions
MIN
MAX
UNIT
Supply voltage, VCC +
3.5
18
V
Supply voltage, VCC
3.5
18
V
electrical characteristics over operating free-air temperature range, V
CC
=
15 V (unless
otherwise specified)
PARAMETER
TEST
T
LF347
LF347B
UNIT
PARAMETER
CONDITIONS
TA
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIO
Input offset voltage
VIC = 0,
25
C
5
10
3
5
mV
VIO
Input offset voltage
IC
,
RS = 10 k
Full range
13
7
mV
VIO
Average temperature coefficient of
input offset voltage
VIC = 0,
RS = 10 k
18
18
V/
C
IIO
Inp t offset c rrent
VIC = 0
25
C
25
100
25
100
pA
IIO
Input offset current
VIC = 0
70
C
4
4
nA
IIB
Inp t bias c rrent
VIC = 0
25
C
50
200
50
200
pA
IIB
Input bias current
VIC = 0
70
C
8
8
nA
VICR
Common-mode input voltage range
11
12
to
15
11
12
to
15
V
VOM
Maximum peak output voltage swing
RL = 10 k
12
13.5
12
13.5
V
AVD
Large signal differential voltage
VO =
10 V,
25
C
25
100
50
100
V/mV
AVD
Large-signal differential voltage
O
,
RL = 2 k
Full range
15
25
V/mV
ri
Input resistance
TA = 25
C
1012
1012
CMRR
Common-mode rejection ratio
RS
2 k
70
100
80
100
dB
kSVR
Supply-voltage rejection ratio
See Note 2
70
100
80
100
dB
ICC
Supply current
8
11
8
11
mA
Full range is 0
C to 70
C.
Input bias currents of a FET-input operational amplifier are normal junction reverse currents, which are temperature sensitive. Pulse techniques
must be used that will maintain the junction temperatures as close to the ambient temperature as possible.
NOTE 2: Supply-voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously.
operating characteristics, V
CC
=
15 V
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VO1/VO2
Crosstalk attentuation
f = 1 kHz
120
dB
SR
Slew rate
8
13
V/
s
B1
Unity-gain bandwidth
3
MHz
Vn
Equivalent input noise voltage
f = 1 kHz,
RS = 20
18
nV/
Hz
In
Equivalent input noise current
f = 1 kHz
0.01
pA/
Hz
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pertaining to warranty, patent infringement, and limitation of liability.
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accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright
1998, Texas Instruments Incorporated
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