Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp J-FET SOIC 14 N

LF444

www.ti.com

SNOSC04D –MAY 1998–REVISED MARCH 2013

LF444 Quad Low Power JFET Input Operational Amplifier

Check for Samples: LF444

FEATURES

DESCRIPTION

The LF444 quad low power operational amplifier

• ¼ Supply Current of a LM148: 200 μA/Amplifier

provides many of the same AC characteristics as the

(max)

industry standard LM148 while greatly improving the

• Low Input Bias Current: 50 pA (max)

DC characteristics of the LM148. The amplifier has

• High Gain Bandwidth: 1 MHz

the same bandwidth, slew rate, and gain (10 kΩ load)

as the LM148 and only draws one fourth the supply

• High Slew Rate: 1 V/μs

current of the LM148. In addition the well matched

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

high voltage JFET input devices of the LF444 reduce

• Low Input Noise Current 0.01 pA/√Hz

the input bias and offset currents by a factor of

10,000 over the LM148. The LF444 also has a very

• High Input Impedance: 10

low equivalent input noise voltage for a low power

• High Gain: 50k (min)

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 Connection Diagram

Figure 1. 1/4 Quad 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.

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.

2BI-FET is a trademark of Texas Instruments.

3All 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.

Summary of content (18 pages)

PAGE 1
LF444 www.ti.com SNOSC04D – MAY 1998 – REVISED MARCH 2013 LF444 Quad Low Power JFET Input Operational Amplifier Check for Samples: LF444 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.
PAGE 2
LF444 SNOSC04D – MAY 1998 – REVISED MARCH 2013 www.ti.
PAGE 3
LF444 www.ti.
PAGE 4
LF444 SNOSC04D – MAY 1998 – REVISED MARCH 2013 www.ti.com 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.
PAGE 5
LF444 www.ti.com SNOSC04D – MAY 1998 – REVISED MARCH 2013 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.
PAGE 6
LF444 SNOSC04D – MAY 1998 – REVISED MARCH 2013 www.ti.com 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.
PAGE 7
LF444 www.ti.com SNOSC04D – MAY 1998 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Open Loop Voltage Gain Output Impedance Figure 21. Figure 22. Inverter Settling Time Figure 23.
PAGE 8
LF444 SNOSC04D – MAY 1998 – REVISED MARCH 2013 www.ti.com 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.
PAGE 9
LF444 www.ti.com 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.
PAGE 10
LF444 SNOSC04D – MAY 1998 – REVISED MARCH 2013 www.ti.com 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.
PAGE 11
LF444 www.ti.com 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 ..........................................................................................................
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
PAGE 13
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.
PAGE 14
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.
PAGE 15
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.
PAGE 16
MECHANICAL DATA NFF0014A N0014A N14A (Rev G) www.ti.
PAGE 17
PAGE 18
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.