TI1 LF444CM/NOPB Lf444 quad low power jfet input operational ampli Datasheet

LF444
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SNOSC04D – MAY 1998 – REVISED MARCH 2013
LF444 Quad Low Power JFET Input Operational Amplifier
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FEATURES
DESCRIPTION
1
•
23
•
•
•
•
•
•
•
¼ Supply Current of a LM148: 200 μA/Amplifier
(max)
Low Input Bias Current: 50 pA (max)
High Gain Bandwidth: 1 MHz
High Slew Rate: 1 V/μs
Low Noise Voltage for Low Power 35 nV/√Hz
Low Input Noise Current 0.01 pA/√Hz
High Input Impedance: 1012Ω
High Gain: 50k (min)
The LF444 quad low power operational amplifier
provides many of the same AC characteristics as the
industry standard LM148 while greatly improving the
DC characteristics of the LM148. The amplifier has
the same bandwidth, slew rate, and gain (10 kΩ load)
as the LM148 and only draws one fourth the supply
current of the LM148. In addition the well matched
high voltage JFET input devices of the LF444 reduce
the input bias and offset currents by a factor of
10,000 over the LM148. The LF444 also has a very
low equivalent input noise voltage for a low power
amplifier.
The LF444 is pin compatible with the LM148 allowing
an immediate 4 times reduction in power drain in
many applications. The LF444 should be used
wherever low power dissipation and good electrical
characteristics are the major considerations.
Simplified Schematic
Figure 1. 1/4 Quad
Connection Diagram
Figure 2. PDIP/SOIC Package
Top View
See Package Number NAK0014D, D0014A or
NFF0014A
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
1
2
3
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
BI-FET is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1998–2013, Texas Instruments Incorporated
LF444
SNOSC04D – MAY 1998 – REVISED MARCH 2013
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Absolute Maximum Ratings (1) (2) (3)
LF444A
LF444
Supply Voltage
±22V
±18V
Differential Input Voltage
±38V
±30V
Input Voltage Range (4)
±19V
±15V
Output Short CircuitDuration
(5)
Power Dissipation (6) (7)
Tj max
θjA (Typical)
Continuous
Continuous
NAK Package
D, NFF
Packages
900 mW
670 mW
150°C
115°C
100°C/W
85°C/W
LF444A/LF444
See (8)
Operating Temperature Range
ESD Tolerance
(9)
Rating to be determined
−65°C ≤ TA ≤ 150°C
Storage Temperature Range
Soldering Information
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Dual-In-Line Packages (Soldering, 10 sec.)
260°C
Small Outline Package
Vapor Phase (60 sec.)
215°C
Infrared (15 sec.)
220°C
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 ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication
of device performance.
If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
Refer to RETS444X for LF444MD military specifications.
Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
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.
For operating at elevated temperature, these devices must be derated based on a thermal resistance of θjA.
Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the
part to operate outside ensured limits.
The LF444A is available in both the commercial temperature range 0°C ≤ TA ≤ 70°C and the military temperature range −55°C ≤ TA ≤
125°C. The LF444 is available in the commercial temperature range only. The temperature range is designated by the position just
before the package type in the device number. A “C” indicates the commercial temperature range and an “M” indicates the military
temperature range. The military temperature range is available in “NAK” package only.
Human body model, 1.5 kΩ in series with 100 pF.
DC Electrical Characteristics
Symbol
(1)
Parameter
Conditions
LF444A
Min
VOS
Input Offset Voltage
RS = 10k, TA = 25°C
Max
2
5
0°C ≤ TA ≤ +70°C
Average TC of Input Offset
Voltage
RS = 10 kΩ
IOS
Input Offset Current
VS = ±15V (1)
IB
(1)
(2)
2
Input Bias Current
VS = ±15V
(1) (2)
Tj = 25°C
Max
3
10
mV
12
mV
5
25
1.5
Tj = 125°C
10
10
mV
μV/°C
10
Tj = 70°C
Tj = 25°C
Units
Typ
8
10
(2)
Min
6.5
−55°C ≤ TA ≤ +125°C
ΔVOS/ΔT
LF444
Typ
50
Tj = 70°C
3
Tj = 125°C
20
5
50
pA
1.5
nA
nA
10
100
pA
3
nA
nA
Unless otherwise specified the specifications apply over the full temperature range and for VS = ±20V for the LF444A and for VS = ±15V
for the LF444. VOS, IB, and IOS are measured at VCM = 0.
The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature,
Tj. Due to limited 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, PD. Tj = TA + θjAPD where θjA is the
thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum.
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DC Electrical Characteristics (1) (continued)
Symbol
Parameter
Conditions
LF444A
Min
Typ
LF444
Max
Min
Typ
1012
RIN
Input Resistance
Tj = 25°C
AVOL
Large Signal Voltage Gain
VS = ±15V, VO = ±10V
50
100
25
Units
Max
1012
Ω
100
V/mV
RL = 10 kΩ, TA = 25°C
VO
Output Voltage Swing
VCM
Input Common-Mode
Over Temperature
25
VS = ±15V, RL = 10 kΩ
±12
±13
±12
±13
V
±16
+18
Common-Mode
V/mV
±11
+14
V
−17
Voltage Range
CMRR
15
−12
V
RS ≤ 10 kΩ
80
100
70
95
dB
See (3)
80
100
70
90
dB
Rejection Ratio
PSRR
Supply Voltage
Rejection Ratio
IS
(3)
Supply Current
0.6
0.8
0.6
1.0
mA
Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with
common practice from ±15V to ±5V for the LF444 and from ±20V to ±5V for the LF444A.
AC Electrical Characteristics
Symbol
(1)
Parameter
Conditions
LF444A
Min
Amplifier-to-Amplifier
Typ
LF444
Max
Min
Typ
−120
−120
Units
Max
dB
Coupling
SR
Slew Rate
VS = ±15V, TA = 25°C
1
1
V/μs
GBW
Gain-Bandwidth Product
VS = ±15V, TA = 25°C
1
1
MHz
en
Equivalent Input Noise Voltage
TA = 25°C, RS = 100Ω,
35
35
nV/√Hz
0.01
0.01
pA/√Hz
f = 1 kHz
in
(1)
Equivalent Input Noise Current
TA = 25°C, f = 1 kHz
Unless otherwise specified the specifications apply over the full temperature range and for VS = ±20V for the LF444A and for VS = ±15V
for the LF444. VOS, IB, and IOS are measured at VCM = 0.
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LF444
SNOSC04D – MAY 1998 – REVISED MARCH 2013
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Typical Performance Characteristics
4
Input Bias Current
Input Bias Current
Figure 3.
Figure 4.
Supply Current
Positive Common-Mode
Input Voltage Limit
Figure 5.
Figure 6.
Negative Common-Mode
Input Voltage Limit
Positive Current Limit
Figure 7.
Figure 8.
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Typical Performance Characteristics (continued)
Negative Current Limit
Output Voltage Swing
Figure 9.
Figure 10.
Output Voltage Swing
Gain Bandwidth
Figure 11.
Figure 12.
Bode Plot
Slew Rate
Figure 13.
Figure 14.
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Typical Performance Characteristics (continued)
6
Distortion
vs
Frequency
Undistorted Output
Voltage Swing
Figure 15.
Figure 16.
Open Loop
Frequency Response
Common-Mode
Rejection Ratio
Figure 17.
Figure 18.
Power Supply
Rejection Ratio
Equivalent Input
Noise Voltage
Figure 19.
Figure 20.
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Typical Performance Characteristics (continued)
Open Loop Voltage Gain
Output Impedance
Figure 21.
Figure 22.
Inverter Settling Time
Figure 23.
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LF444
SNOSC04D – MAY 1998 – REVISED MARCH 2013
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Pulse Response
RL = 10 kΩ, CL = 10 pF
8
Small Signal Inverting
Large Signal Inverting
Figure 24.
Figure 25.
Small Signal Non-Inverting
Large Signal Non-Inverting
Figure 26.
Figure 27.
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SNOSC04D – MAY 1998 – REVISED MARCH 2013
APPLICATION HINTS
This device is a quad low power op amp with JFET input devices ( BI-FET™). 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, neither 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.
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.
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 amplifiers will operate with a common-mode input voltage equal to the positive supply; however, the gain
bandwidth 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.
Each amplifier is individually biased to allow normal circuit operation with power supplies of ±3.0V. Supply
voltages less than these may degrade the common-mode rejection and restrict the output voltage swing.
The amplifiers will drive a 10 kΩ load resistance to ±10V over the full temperature range. If the amplifier is forced
to drive heavier load currents, however, an increase in input offset voltage may occur on the negative voltage
swing and finally reach an active current limit on both positive and negative swings.
Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in
polarity or that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through
the resulting 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
order to ensure stability. For example, resistors from the output 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.
A feedback pole is created when the feedback around any amplifier is resistive. The parallel resistance and
capacitance from the input of the device (usually the inverting input) to AC ground set the frequency of the pole.
In many instances the frequency of this pole is much greater than the expected 3 dB frequency of the closed
loop gain and consequently there is negligible effect on stability margin. However, if the feedback pole is less
than approximately 6 times the expected 3 dB frequency a lead capacitor should be placed from the output to the
input of the op amp. The value of the added capacitor should be such that the RC time constant of this capacitor
and the resistance it parallels is greater than or equal to the original feedback pole time constant.
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LF444
SNOSC04D – MAY 1998 – REVISED MARCH 2013
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Typical Application
Figure 28. pH Probe Amplifier/Temperature Compensator
***For R2 = 50k, R4 = 330k ±1%
For R2 = 100k, R4 = 75k ±1%
For R2 = 200k, R4 = 56k ±1%
**Polystyrene
*Film resistor type RN60C
To calibrate, insert probe in pH =7 solution. Set the “TEMPERATURE ADJUST” pot, R2, to correspond to the solution
temperature: full clockwise for 0°C, and proportionately for intermediate temperatures, using a turns-counting dial.
Then set “CALIBRATE” pot so output reads 7V.
Typical probe = Ingold Electrodes #465-35
Detailed Schematic
Figure 29. 1/4 Quad
10
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SNOSC04D – MAY 1998 – REVISED MARCH 2013
REVISION HISTORY
Changes from Revision C (March 2013) to Revision D
•
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 10
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11
PACKAGE OPTION ADDENDUM
www.ti.com
1-Nov-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LF444ACN
NRND
PDIP
NFF
14
25
TBD
Call TI
Call TI
0 to 70
LF444ACN
LF444ACN/NOPB
ACTIVE
PDIP
NFF
14
25
Green (RoHS
& no Sb/Br)
CU SN
Level-1-NA-UNLIM
0 to 70
LF444ACN
LF444CM
NRND
SOIC
D
14
55
TBD
Call TI
Call TI
0 to 70
LF444CM
LF444CM/NOPB
ACTIVE
SOIC
D
14
55
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
LF444CM
LF444CMX/NOPB
ACTIVE
SOIC
D
14
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
0 to 70
LF444CM
LF444CN
NRND
PDIP
NFF
14
25
TBD
Call TI
Call TI
0 to 70
LF444CN
LF444CN/NOPB
ACTIVE
PDIP
NFF
14
25
Green (RoHS
& no Sb/Br)
CU SN | Call TI
Level-1-NA-UNLIM
0 to 70
LF444CN
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
1-Nov-2013
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
LF444CMX/NOPB
Package Package Pins
Type Drawing
SOIC
D
14
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
2500
330.0
16.4
Pack Materials-Page 1
6.5
B0
(mm)
K0
(mm)
P1
(mm)
9.35
2.3
8.0
W
Pin1
(mm) Quadrant
16.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
LF444CMX/NOPB
SOIC
D
14
2500
367.0
367.0
35.0
Pack Materials-Page 2
MECHANICAL DATA
NFF0014A
N0014A
N14A (Rev G)
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