National Semiconductor LF147, LF347 Technical data
August 2000
LF147/LF347
Wide Bandwidth Quad JFET Input Operational Amplifiers
LF147/LF347 Wide Bandwidth Quad JFET Input Operational Amplifiers
General Description
The LF147 is a low cost, high speed quad JFET input
operational amplifier with an internally trimmed input offset
voltage (BI-FET II
supply current and yet maintains a large gain bandwidth
product and a fast slew rate. In addition, well matched high
voltage JFET input devices provide very low input bias and
offset currents. The LF147 is pin compatible with the standard LM148. This feature allows designers to immediately
upgrade the overall performance of existing LF148 and
LM124 designs.
The LF147 may be used in applications such as high speed
integrators, fast D/A converters, sample-and-hold circuits
and many other circuits requiring low input offset voltage,
low input bias current, high input impedance, high slew rate
and wide bandwidth. The device has low noise and offset
voltage drift.
™
technology). The device requires a low
Simplified Schematic
1
⁄4Quad
Features
n Internally trimmed offset voltage: 5 mV max
n Low input bias current: 50 pA
n Low input noise current: 0.01 pA/
n Wide gain bandwidth: 4 MHz
n High slew rate: 13 V/µs
n Low supply current: 7.2 mA
n High input impedance: 10
n Low total harmonic distortion: ≤0.02%
n Low 1/f noise corner: 50 Hz
n Fast settling time to 0.01%: 2 µs
√
Hz
12
Connection Diagram
Dual-In-Line Package
Ω
00564713
BI-FET II™is a trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS005647 www.national.com
Note 1: LF147 available as per JM38510/11906.
Top View
Order Number LF147J, LF147J-SMD, LF347M,
LF347BN, LF347N, LF147J/883,
or JL147 BCA (Note 1)
See NS Package Number J14A, M14A or N14A
00564701
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LF147/LF347
Supply Voltage
Differential Input Voltage
Input Voltage Range
(Note 3)
Output Short Circuit Continuous Continuous
Duration (Note 4)
Power Dissipation 900 mW 1000 mW
(Notes 5, 11)
T
max 150˚C 150˚C
j
θ
jA
Ceramic DIP (J) Package 70˚C/W
Plastic DIP (N) Package 75˚C/W
LF147 LF347B/LF347
±
22V
±
38V
±
19V
±
±
±
18V
30V
15V
Operating Temperature (Note 6) (Note 6)
Range
Storage Temperature
Range −65˚C≤T
Lead Temperature
(Soldering, 10 sec.) 260˚C 260˚C
Soldering Information
Dual-In-Line Package
Soldering (10 seconds) 260˚C
Small Outline Package
Vapor Phase (60 seconds) 215˚C
Infrared (15 seconds) 220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
ESD Tolerance (Note 12) 900V
LF147 LF347B/LF347
≤150˚C
A
Surface Mount Narrow (M) 100˚C/W
Surface Mount Wide (WM) 85˚C/W
DC Electrical Characteristics (Note 7)
Symbol Parameter Conditions LF147 LF347B LF347 Units
Min Typ Max Min Typ Max Min Typ Max
V
OS
∆V
I
OS
I
B
R
IN
A
VOL
V
O
V
CM
CMRR Common-Mode Rejection Ratio R
PSRR Supply Voltage Rejection Ratio (Note 9) 80 100 80 100 70 100 dB
I
S
Input Offset Voltage RS=10 kΩ,TA=25˚C 1 5 3 5 5 10 mV
Over Temperature 8 7 13 mV
/∆T Average TC of Input Offset RS=10 kΩ 10 10 10 µV/˚C
OS
Voltage
Input Offset Current Tj=25˚C, (Notes 7, 8) 25 100 25 100 25 100 pA
Over Temperature 25 4 4 nA
Input Bias Current Tj=25˚C, (Notes 7, 8) 50 200 50 200 50 200 pA
Over Temperature 50 8 8 nA
Input Resistance Tj=25˚C 10
12
10
12
10
12
Large Signal Voltage Gain VS=±15V, TA=25˚C 50 100 50 100 25 100 V/mV
V
=±10V, RL=2 kΩ
O
Over Temperature 25 25 15 V/mV
Output Voltage Swing VS=±15V, RL=10 kΩ
Input Common-Mode Voltage VS=±15V
±12±
±
11 +15
13.5
±12±
±
11 +15
13.5
±12±
13.5 V
±
11 +15 V
Range −12 −12 −12 V
≤10 kΩ 80 100 80 100 70 100 dB
S
Supply Current 7.2 11 7.2 11 7.2 11 mA
Ω
www.national.com 2
AC Electrical Characteristics (Note 7)
Symbol Parameter Conditions LF147 LF347B LF347 Units
Min Typ Max Min Typ Max Min Typ Max
Amplifier to Amplifier Coupling T
SR Slew Rate V
GBW Gain-Bandwidth Product V
e
n
i
n
Equivalent Input Noise Voltage TA=25˚C, RS=100Ω,202020
Equivalent Input Noise Current Tj=25˚C, f=1000 Hz 0.01 0.01 0.01
=25˚C, −120 −120 −120 dB
A
f=1 Hz−20 kHz
(Input Referred)
=±15V, TA=25˚C 8 13 8 13 8 13 V/µs
S
=±15V, TA=25˚C 2.2 4 2.2 4 2.2 4 MHz
S
f=1000 Hz
LF147/LF347
THD Total Harmonic Distortion AV=+10, RL=10k,
=20 Vp-p,
V
O
<
0.02
<
0.02
<
0.02 %
BW=20 Hz−20 kHz
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 3: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
Note 4: Any of the amplifier outputs can be shorted to ground indefinitely, however, more than one should not be simultaneously shorted as the maximum junction
temperature will be exceeded.
Note 5: For operating at elevated temperature, these devices must be derated based on a thermal resistance of θ
Note 6: The LF147 is available in the military temperature range −55˚C≤T
range 0˚C≤T
Note 7: Unless otherwise specified the specifications apply over the full temperature range and for V
V
OS,IB
Note 8: The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, T
production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient
temperature as a result of internal power dissipation, P
recommended if input bias current is to be kept to a minimum.
Note 9: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice from
V
=±5V to±15V for the LF347 and LF347B and from VS=±20V to±5V for the LF147.
S
Note 10: Refer to RETS147X for LF147D and LF147J military specifications.
Note 11: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate
outside guaranteed limits.
Note 12: Human body model, 1.5 kΩ in series with 100 pF.
≤70˚C. Junction temperature can rise to Tjmax = 150˚C.
A
, and IOSare measured at VCM=0.
D.Tj=TA+θjAPD
≤125˚C, while the LF347B and the LF347 are available in the commercial temperature
A
=±20V for the LF147 and for VS=±15V for the LF347B/LF347.
S
where θjAis the thermal resistance from junction to ambient. Use of a heat sink is
.
jA
. Due to limited
j
www.national.com3
Typical Performance Characteristics
Input Bias Current Input Bias Current
LF147/LF347
00564714
Positive Common-Mode
Supply Current
00564716
Input Voltage Limit
Negative Common-Mode
Input Voltage Limit Positive Current Limit
00564715
00564717
00564718
www.national.com 4
00564719
Typical Performance Characteristics (Continued)
Negative Current Limit Output Voltage Swing
LF147/LF347
00564720
Output Voltage Swing Gain Bandwidth
00564722
Bode Plot Slew Rate
00564721
00564723
00564724
00564725
www.national.com5
Loading...