LM348 National Semiconductor, LM348 Datasheet

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LM348

Manufacturer Part Number
LM348
Description
Manufacturer
National Semiconductor
Datasheet

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© 2003 National Semiconductor Corporation
LM148/LM248/LM348
Quad 741 Op Amps
General Description
The LM148 series is a true quad 741. It consists of four
independent, high gain, internally compensated, low power
operational amplifiers which have been designed to provide
functional characteristics identical to those of the familiar
741 operational amplifier. In addition the total supply current
for all four amplifiers is comparable to the supply current of a
single 741 type op amp. Other features include input offset
currents and input bias current which are much less than
those of a standard 741. Also, excellent isolation between
amplifiers has been achieved by independently biasing each
amplifier and using layout techniques which minimize ther-
mal coupling.
The LM148 can be used anywhere multiple 741 or 1558 type
amplifiers are being used and in applications where amplifier
matching or high packing density is required. For lower
power refer to LF444.
Schematic Diagram
* 1 pF in the LM149
DS007786
Features
n 741 op amp operating characteristics
n Class AB output stage — no crossover distortion
n Pin compatible with the LM124
n Overload protection for inputs and outputs
n Low supply current drain:
n Low input offset voltage:
n Low input offset current:
n Low input bias current
n High degree of isolation between amplifiers:
n Gain bandwidth product
n
LM148 (unity gain):
00778601
0.6 mA/Amplifier
November 2003
www.national.com
1.0 MHz
120 dB
30 nA
1 mV
4 nA

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LM348 Summary of contents

Page 1

... LM148/LM248/LM348 Quad 741 Op Amps General Description The LM148 series is a true quad 741. It consists of four independent, high gain, internally compensated, low power operational amplifiers which have been designed to provide functional characteristics identical to those of the familiar 741 operational amplifier. In addition the total supply current for all four amplifiers is comparable to the supply current of a single 741 type op amp ...

Page 2

... T ≤ +70˚ −65˚C to +150˚C −65˚C to +150˚C 300˚C 300˚C 260˚C 260˚C 260˚C 215˚C 215˚C 220˚C 220˚C 500V 500V LM248 LM348 5.0 1.0 6.0 1.0 6 100 30 200 30 200 0.8 2.5 0.8 2 ...

Page 3

... − T )/θ or the 25˚ JMAX A JA 15V and over the absolute maximum operating temperature range (T ± 15V S 00778606 00778643 3 LM248 LM348 325 500 400 15 15 ± ± ± ± ± ± ± ± ± ...

Page 4

Typical Performance Characteristics Supply Current Voltage Swing Negative Current Limit www.national.com 00778623 Positive Current Limit 00778625 00778627 4 Input Bias Current 00778624 00778626 Output Impedance 00778628 ...

Page 5

Typical Performance Characteristics Common-Mode Rejection Ratio Bode Plot LM148 Small Signal Pulse Response (LM148) (Continued) Open Loop Frequency Response 00778629 Large Signal Pulse Response (LM148) 00778631 Undistorted Output Voltage Swing 00778635 5 00778630 00778633 00778637 www.national.com ...

Page 6

Typical Performance Characteristics Gain Bandwidth Inverting Large Signal Pulse Response (LM148) Positive Common-Mode Input Voltage Limit www.national.com (Continued) 00778638 Input Noise Voltage and Noise Current 00778641 Negative Common-Mode Input Voltage Limit 00778643 6 Slew Rate 00778639 00778642 00778605 ...

Page 7

Application Hints The LM148 series are quad low power 741 op amps. In the proliferation of quad op amps, these are the first to offer the convenience of familiar, easy to use operating characteris- tics of the 741 op amp. ...

Page 8

Typical Applications—LM148 ± 15V R2, trim R2 to boost CMRR Low Drift Peak Detector with Bias Current Compensation Adjust R for minimum drift D3 low leakage diode D1 added to improve speed ± ...

Page 9

Typical Applications—LM148 Tune Q through R0 ≤ For predictable results Use Band Pass output to tune for Q (Continued) Universal State-Variable Filter 9 00778611 www.national.com ...

Page 10

Typical Applications—LM148 Use general equations, and tune each section separately Q = 0.541 1.306 1stSECTION 2ndSECTION The response should have 0 dB peaking Ex kHz 270k ...

Page 11

Typical Applications—LM148 A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros) R1C1 = R2C2 = t R'1C'1 = R'2C kHz kHz 0.543 2.14 0.841, ...

Page 12

Typical Simulation LM148, LM741 Macromodel for Computer Simulation For more details, see IEEE Journal of Solid-State Circuits, Vol. SC-9, No. 6, December 1974 −16 Note 6: = 112I = Note 7: = 144* ...

Page 13

... Connection Diagram Order Number LM148J, LM148J/883, LM248J, LM348M, or LM348N See NS Package Number J14A, M14A or N14A Top View LM148J is available per JM38510/11001 13 00778602 www.national.com ...

Page 14

... Physical Dimensions unless otherwise noted www.national.com inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number LM148J, LM148J/883, LM248J NS Package Number J14A S.O. Package (M) Order Number LM348M or LM348MX NS Package Number M14A 14 ...

Page 15

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM348N NS Package Number N14A 2. A critical component is any component of a life ...

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