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LF442

www.ti.com

SNOSC03E –APRIL 1999–REVISED OCTOBER 2013

LF442 Dual Low Power JFET Input Operational Amplifier

Check for Samples: LF442

FEATURES

DESCRIPTION

The LF442 dual low power operational amplifiers

• 1/10 Supply Current of a LM1458: 400 μA (max)

provide many of the same AC characteristics as the

• Low Input Bias Current: 50 pA (max)

industry standard LM1458 while greatly improving the

• Low Input Offset Voltage: 1 mV (max)

DC characteristics of the LM1458. The amplifiers

have the same bandwidth, slew rate, and gain (10 kΩ

• Low Input Offset Voltage Drift: 10 μV/°C (max)

load) as the LM1458 and only draw one tenth the

• High Gain Bandwidth: 1 MHz

supply current of the LM1458. In addition the well

• High Slew Rate: 1 V/μs

matched high voltage JFET input devices of the

LF442 reduce the input bias and offset currents by a

• Low Noise Voltage for Low Power: 35 nV/√Hz

factor of 10,000 over the LM1458. A combination of

• Low Input Noise Current: 0.01 pA/√Hz

careful layout design and internal trimming ensures

• High Input Impedance: 10

very low input offset voltage and voltage drift. The

LF442 also has a very low equivalent input noise

• High Gain V

= ±10V, R

= 10k: 50k (min)

voltage for a low power amplifier.

The LF442 is pin compatible with the LM1458

allowing an immediate 10 times reduction in power

drain in many applications. The LF442 should be

used where low power dissipation and good electrical

characteristics are the major considerations.

Typical Connection

Connection Diagrams

Pin 4 connected to case

PDIP Package Top View

Package Number P0008E

TO Package Top View

Package Number LMC0008C

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.

2All 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.

Summary of content (20 pages)

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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 LF442 Dual Low Power JFET Input Operational Amplifier Check for Samples: LF442 FEATURES 1 • • • • • • • • • • 2 1/10 Supply Current of a LM1458: 400 μA (max) Low Input Bias Current: 50 pA (max) Low Input Offset Voltage: 1 mV (max) Low Input Offset Voltage Drift: 10 μV/°C (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.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.com 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.
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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 DC Electrical Characteristics (1) (2) Symbol VOS Parameter Input Offset Voltage Conditions LF442A Min RS = 10 kΩ, TA = 25°C LF442 Typ Max 0.5 1.0 Min Max 1.0 5.0 mV 7.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.com AC Electrical Characteristics (1) (2) Symbol Parameter Conditions LF442A Min Typ LF442 Max Min Typ Max Units Amplifier to Amplifier Coupling TA = 25°C, f = 1 Hz-20 kHz (Input Referred) SR Slew Rate VS = ±15V, TA = 25°C 0.8 1 0.6 1 V/μs GBW Gain-Bandwidth Product VS = ±15V, TA = 25°C 0.8 1 0.
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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 Typical Performance Characteristics Input Bias Current Input Bias Current Figure 1. Figure 2. Supply Current Positive Common-Mode Input Voltage Limit Figure 3. Figure 4. Negative Common-Mode Input Voltage Limit Positive Current Limit Figure 5. Figure 6.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics (continued) 6 Negative Current Limit Output Voltage Swing Figure 7. Figure 8. Output Voltage Swing Gain Bandwidth Figure 9. Figure 10. Bode Plot Slew Rate Figure 11. Figure 12.
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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Distortion vs Frequency Undistorted Output Voltage Swing Figure 13. Figure 14. Open Loop Frequency Response Common-Mode Rejection Ratio Figure 15. Figure 16. Power Supply Rejection Ratio Equivalent Input Noise Voltage Figure 17. Figure 18.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics (continued) Open Loop Voltage Gain Output Impedance Figure 19. Figure 20. Inverter Settling Time Figure 21.
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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Pulse Response RL = 10 kΩ, CL = 10 pF Small Signal Inverting Small Signal Non-Inverting Figure 22. Figure 23. Large Signal Inverting Large Signal Non-Inverting Figure 24. Figure 25.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.com APPLICATION HINTS This device is a dual low power op amp with internally trimmed input offset voltages and JFET input devices (BIFET 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.
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LF442 www.ti.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.
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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 Unconventional Log Amplifier Q1, Q2, Q3 are included on LM389 amplifier chip which is temperature-stabilized by the LM389 and Q2-Q3, which act as a heater-sensor pair. Q1, the logging transistor, is thus immune to ambient temperature variation and requires no temperature compensation at all.
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LF442 SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 www.ti.
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LF442 www.ti.com SNOSC03E – APRIL 1999 – REVISED OCTOBER 2013 REVISION HISTORY Changes from Revision C (March 2013) to Revision D • Page Changed layout of National Data Sheet to TI format .......................................................................................................... 14 Changes from Revision D (March 2013) to Revision E • Page Changed Input Noise Voltage units ...................................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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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.
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