©2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0
Features
• Low input bias current
• Hi gh input impedance
• Wide gain bandwidth : 4 MHz Typ.
• High slew rate: 13 V/µs Typ.
Description
The LF347 is a high speed quad JFET input operational
amplifier. This feature high input impedance, wide
bandwidth, high slew rate, and low input offset voltage and
bias current. LF347 may be used in circuits requiring high
input impedance. High slew rate and wide bandwidth, low
input bias current.
14-DIP
1
14-SOP
1
Internal Block Diagram
LF347
Quad Operational Amplifier (JFET)
LF347
2
Schematic Diagram
(One Section Only)
Absolute Maximum Ratings
Parameter Symbol Value Unit
Supply Voltage VCC ±18 V
Differential Input Voltage VI(DIFF) 30 V
Input Voltage Range VI±15 V
Output Short Circuit Duration - Continuous -
Power Dissipation PD570 mW
Operating Temperature Range TOPR 0 ~ + 70 °C
Storage Temperature Range TSTG -65 ~ + 150 °C
LF347
3
Electrical Characteristics
(VCC= +15V, VEE= -15V, TA=25 °C, unless otherwise specified)
Note :
1. LF347 : 0≤TA≤+70 °C
2. Guaranteed by design
Parameter Symbol Conditions LF347 Unit
Min. Typ. Max.
Input Offset Voltage VIO RS = 10KΩ-510 mV
Note 1 - - 13
Input Offset Voltage Drift(Note2) ∆VIO/∆TR
S = 10KΩ-10- µV/ °C
Input Offset Current IIO - 25 100 pA
Note 1 - - 4 nA
Input Bias Current IBIAS - 50 200 pA
Note 1 - - 8 nA
Large Signal Voltage Gain GVRL = 2KΩ25 100 - V/mV
VO(P-P)= ±10V Note 1 15 - -
Output Voltage Swing VO(PP) RL = 10KΩ±12 ±13.5 - V
Input Voltage Range VI(R) -±11 +15
-12 -V
Common-Mode Rejection Ratio CMRR RS ≤ 10KΩ80 100 - dB
Power Supply Rejection Ratio PSRR RS ≤ 10KΩ80 100 - dB
Input Resistance RI--10
12 -Ω
Supply Current ICC --7.211 mA
Slew Rate SR --13- V/µS
Gain Bandwidth Product(Note2) GBW --4- MHz
Channel Seperation CS f = 1Hz ~ 20Khz
(input referenced) - 120 - dB
Equivalent Input Noise
Voltage eNRS = 100Ω
f = 1KHz -20- nV/
Equivalent Input Noise
Current INf = 1KHz - 0.01 - pA/
Hz
Hz
LF347
4
Mechanical Dimensions
Package Dimensions in millimeters
6.40 ±0.20
7.62
0.300
2.54
0.100
#1
#7 #8
#14
0.252 ±0.008
0~15°
0.25
+0.10
–0.05
0.010
+0.004
–0.002
3.30 ±0.30
0.130 ±0.012
3.25 ±0.20
0.128 ±0.008
19.40 ±0.20
0.764 ±0.008
19.80
0.780 MAX
5.08
0.200
0.20
0.008
MAX
MIN
2.08
0.082
()
0.46 ±0.10
0.018 ±0.004
0.059 ±0.004
1.50 ±0.10
14-DIP
LF347
5
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
8.56
±0.20
0.337
±0.008
1.27
0.050
5.72
0.225
1.55
±0.10
0.061
±0.004
0.05
0.002
6.00
±0.30
0.236
±0.012
3.95
±0.20
0.156
±0.008
0.60
±0.20
0.024
±0.008
8.70
0.343 MAX
#1
#7 #8
0~8°
#14
0.47
0.019
()
1.80
0.071
MAX0.10
MAX0.004
MAX
MIN
+
0.10
-0.05
0.20+
0.004
-0.002
0.008
+
0.10
-0.05
0.406+
0.004
-0.002
0.016
14-SOP
LF347
6/1/01 0.0m 001
Stock#DSxxxxxxxx
2001 Fairchild Semicond uctor Corporation
LIFE SU PP ORT POL ICY
FAIRCHILD’S PRODUCTS AR E NOT AUTHORIZED FOR USE AS C RITICAL COMPONENTS I N LIFE S UPPORT DEVICE S
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORA TION. As used he rein :
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or syst em who se failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effec tiv ene ss.
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DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRO DUCTS HEREIN TO IMPROVE RELIABILITY, FUN C TION OR DESIGN . FAIRCHILD DO ES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIG HTS, NOR THE RIGHTS OF OTHERS.
Ordering Information
Product Number Package Operating Temperature
LF347N 14-DIP 0 ~ + 70°C
LF347M 14-SOP
