LF441CN [TI]
LF441 Low Power JFET Input Operational Amplifier;
| 型号： | LF441CN |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LF441 Low Power JFET Input Operational Amplifier 放大器 光电二极管 |
| 文件： | 总12页 (文件大小：484K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LF441
LF441 Low Power JFET Input Operational Amplifier
Literature Number: SNOSC14A
February 1995
LF441 Low Power JFET
Input Operational Amplifier
General Description
The LF441 low power operational amplifier provides many
of the same AC characteristics as the industry standard
LM741 while greatly improving the DC characteristics of the
LM741. The amplifier has the same bandwidth, slew rate,
and gain (10 kX load) as the LM741 and only draws one
tenth the supply current of the LM741. In addition, the well
matched high voltage JFET input devices of the LF441 re-
duce the input bias and offset currents by a factor of 10,000
over the LM741. A combination of careful layout design and
internal trimming guarantees very low input offset voltage
and voltage drift. The LF441 also has a very low equivalent
input noise voltage for a low power amplifier.
dissipation and good electrical characteristics are the major
considerations.
Features
Y
1/10 supply current of a LM741
Low input bias current
Low input offset voltage
Low input offset voltage drift
High gain bandwidth
200 mA (max)
50 pA (max)
05 mV (max)
Y
Y
Y
Y
Y
Y
Y
Y
Y
max)
1 MHz
High slew rate
1 Vs
Low noise voltage for low w
Low input noise current
High input impedance
35 nV/
z
1 pASHz
10
The LF441 is pin compatible with the LM741, allowing an
immediate 10 times reduction in power drain in many appli-
cations. The LF441 should be used where low power
12
X
e
e
10k
g
High gain V
10
50k (min)
O
Typical Connection
Ordeing Intion
LF441XYZ
X
Y
indicates ctrical
indicates temature range
ilitary,
mercial
kage type
/9297–1
Connection Drams
kage
Dual-In-Line Package
TL/H/9297–2
Top View
TL/H/9297–4
Note: Pin 4 connected to case.
Order Number LF441MH/883
See NS Package Number H08A
Top View
Order Number LF441ACN,
LF441CM or LF441CN
See NS Package Number M08A or N08E
BI-FETTM is a trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/H/9297
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
LF441A
LF441
Input Voltage Range
(Note 1)
g
g
19V
15V
Output Short Circuit
Duration
LF441A
LF441
Continuous
Continuous
g
g
g
g
Supply Voltage
22V
38V
18V
30V
Differential Input Voltage
H Package
N Package
M Package
Power Dissipation
(Notes 2 and 9)
670 mW
670 mW
T
150 C
§
115 C
§
130 C/W
j max
i
(Typical)
jA
185 C/W
§
§
Board Mount in still air
Board Mount in 400 LF/
min air flow
165 C/W
§
65 C/W
§
i
25 C/W
§
(Note 3)
jC
Operating Temp. Range
Storage Temp. Range
(Note 3)
s
s
s
s
T 150 C
A
b
b
65 C
§
T
A
150 C
§
65 C
§
§
Lead Temperature
(Soldering, 10 seconds)
300 C
§
260 C
§
See AN-450 ‘‘Surface Mounting ods and ir Eft
on Product Reliability’’ for other methof soldering sur-
face mount devices.
LF441A
LF441
Soldering Information
Dual-In-Line Package
Soldering (10 sec.)
Small Outline Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
ESD Tolerance (Note 10
ating to etermined
260 C
§
260 C
§
215 C
§
215 C
§
220 C
§
220 C
§
DC Electrical Characteristics (Note 4)
A
LF441
Units
Symbol
Parameter
Conditions
Max
Min
Typ
Max
e
e
25 C
V
OS
Input Offset Voltage
R
10 kX, T
A
0.5
1
5
mV
mV
§
S
Over Temperature
7.5
e
DV /DT
OS
Average TC of Input
Offset Voltage
R
10 kX (Note
S
7
5
10
10
5
mV/ C
§
e
(Ns
e
e
e
e
g
I
Input Offset Current
Input Bias
Input Resist
T
j
T
j
T
j
25
25
1.5
10
50
3
50
pA
nA
nA
pA
nA
nA
X
OS
70 C
§
1.5
125 C
§
g
4 and 6)
I
15V
25 C
§
10
10
100
3
B
70 C
§
125 C
§
20
12
10
12
R
IN
5 C
§
10
e
e
e
e
g
g
25 C
A
Large Signal Volt
Gain
15V, V
10V,
VOL
S
O
50
25
100
25
15
100
V/mV
R
10 kX, T
§
L
A
Over Temperature
V/mV
V
e
s
e
10 kX
g
g
g
g
g
g
g
13
V
V
Output Voltage Swing
V
S
15V, R
L
12
16
13
12
11
O
Input Common-Mode
Voltage Range
CM
a
b
18, 17
a
b
14, 12
V
CMRR
Common-Mode
Rejection Ratio
R
10 kX
S
80
100
70
95
dB
2
DC Electrical Characteristics (Note 4) (Continued)
LF441A
Typ
LF441
Typ
Symbol
Parameter
Conditions
Units
Min
Max
Min
Max
PSRR
Supply Voltage
Rejection Ratio
(Note 7)
80
100
150
70
90
dB
I
Supply Current
200
150
250
mA
S
AC Electrical Characteristics (Note 4)
LF441A
LF441
Symbol
Parameter
Conditions
Units
Min
Typ
1
Max
Min
0.6
0.6
Typ
1
Max
e
e
e
e
g
g
SR
Slew Rate
V
V
T
15V, T
15V, T
25 C
§
25 C
§
0.8
0.8
V/ms
S
A
e
GBW
Gain-Bandwidth Product
1
1
MHz
S
A
e
S
e
n
Equivalent Input Noise Voltage
25 C, R
100X,
e
1 kHz
§
A
35
35
nV/ Hz
0
e
f
1 kHz
e
i
n
Equivalent Input Noise Current
T
A
25 C, f
§
0.01
0.01
pA/ Hz
0
Note 1: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
Note 2: For operating at elevated temperature, these devices must be derated based on a thermal resistance of i
.
jA
Note 3: The temperature range is designated by the position just before the package type in the device number. A ‘‘C’’ indicates thmperaure range
and an ‘‘M’’ indicates the military temperature range. The military temperature range is available in ‘‘H’’ package nly.
e
e
g
g
Note 4: Unless otherwise specified the specifications apply over the full temperature range and for V
20V for tFA and
15V foe LF441.
S
e
are measured at V
CM
V
OS
, I , and I
B
0.
OS
Note 5: The LF441A is 100% tested to this specification.
Note 6: The input bias currents are junction leakage currents which approximately double for every 10 C increase in the juntemperature, T . Due to limited
§
production test time, the input bias currents measured are correlated to junction temperature. In normal operanction temture ises above the ambient
j
e
recommended if input bias current is to be kept to a minimum.
a
i
temperature as a result of internal power dissipation, P . T
D
T
P where i is the thermal renction to nt. Use of a heat sink is
D jA
j
A
jA
Note 7: Supply voltage rejection ratio is measured for both supply magnitudes increasindecreasing sly in acdance with common practice. From
g
g
g
15V to 5V for the LF441 and from 20V to 5V for the LF441A.
g
Note 8: Refer to RETS441X for LF441MH military specifications.
Note 9: Max. Power Dissipation is defined by the package characteristics. Operating the part nthe Max. ssipation may cause the part to operate
outside guaranteed limits.
Note 10: Human body model, 1.5 kX in series with 100 pF.
Typical Performance Characteristics
Input Bias Current
Input B
Supply Current
TL/H/9297–5
3
Typical Performance Characteristics (Continued)
Negative Current Limit
Output Voltage Swing
Output Voltage Swing
TL/H/9297–6
4
Typical Performance Characteristics (Continued)
Open Loop Voltage Gain
Output Impedance
Inverter Settling Time
TL/H/9297–7
Simplified Schematic
TL/H/9297–3
e
0 pF
Pulse Response
10 k
Small Signal Inverting
TL/H/9297–8
5
e
e
10 kX, C
L
Pulse Response R
10 pF (Continued)
Small Signal Non-Inverting
L
TLH/9297–9
Large Signal Inverting
TL/H/9297–10
nal Non-Inverting
TL/H/9297–11
6
Application Hints
This device is
g
a
low power op amp with an internally
The amplifier will drive a 10 kX load resistance to 10V
over the full temperature range.
trimmed input offset voltage and JFET input devices
(BI-FET II). These JFETs have large reverse breakdown
voltages from gate to source and drain, eliminating the need
for clamps across the inputs. Therefore, large differential
input voltages can easily be accommodated without a large
increase in input current. The maximum differential input
voltage is independent of the supply voltages. However, nei-
ther of the input voltages should be allowed to exceed the
negative supply as this will cause large currents to flow
which can result in a destroyed unit.
Precautions should be taken to ensure that the power sup-
ply for the integrated circuit never becomes reversed in po-
larity or that the unit is not inadvertently installed backwards
in a socket, as an unlimited current surge through the result-
ing forward diode within the IC could cause fusing of the
internal conductors and result in a destroyed unit.
As with most amplifiers, care should be taken with lead
dress, component placement and supply decoupling in or-
der to ensure stability. For example, resistors from the out-
put to an input should be placed with the body close to the
input to minimize ‘‘pick-up’’ and maximize the frequency of
the feedback pole by minimizing the capacitance from the
input to ground.
Exceeding the negative common-mode limit on either input
will force the output to a high state, potentially causing a
reversal of phase to the output. Exceeding the negative
common-mode limit on both inputs will force the amplifier
output to a high state. In neither case does a latch occur
since raising the input back within the common-mode range
again puts the input stage and thus the amplifier in a normal
operating mode.
A feedback pole is created when the feedback around any
amplifier is resistive. The parallel resise and capaci-
tance from the input of the device (uerting input
to AC ground) set the frequency In many in-
stances the frequency of this pole reatean the
expected 3 dB frequenof he cloop gain nd con-
sequently there is negligieffect on bility min. How-
ever, if the feedback pole is ls than appately 6 times
the expected 3 dB frequency, lead capacitor should be
placed from the othe input thop amp. The value
of the added ould be sch that the RC time
constant of thr and the resistance it parallels is
grer than oo the onal feedback pole time con-
stant
Exceeding the positive common-mode limit on a single input
will not change the phase of the output; however, if both
inputs exceed the limit, the output of the amplifier will be
forced to a high state.
The amplifier will operate with a common-mode input volt-
age equal to the positive supply; however, the gain band-
width and slew rate may be decreased in this condition.
When the negative common-mode voltage swings to within
3V of the negative supply, an increase in input offset voltage
may occur.
The amplifier is biased to allow normal circuit operation with
g
power supplies of 3V. Supply voltages less than these
may degrade the common-mode rejection and restrict the
output voltage swing.
Detailed Schematic
TL/H/9297–13
7
8
Physical Dimensions inches (millimeters)
Metal Can Pa
Order Number L
NS Package Num
Dual-In-Line Package(M)
Order Number LF441CM
NS Package Number M08A
9
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package )
Order Number LF441ACN or LF441
NS Package Number N08E
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相关型号：
LF441MH/883
IC OP-AMP, 5000 uV OFFSET-MAX, 1 MHz BAND WIDTH, MBCY8, METAL CAN, BCY-8, Operational Amplifier
NSC
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