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PDF LM248J Data sheet ( Hoja de datos )
| Número de pieza | LM248J | |
| Descripción | Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5) | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM248J (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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May 1999
LM148/LM248/LM348
Quad 741 Op Amps
LM149
Wide Band Decompensated (AV (MIN) = 5)
General Description
The LM148 series is a true quad 741. It consists of four inde-
pendent, high gain, internally compensated, low power op-
erational 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 LM149 series has the same features as
the LM148 plus a gain bandwidth product of 4 MHz at a gain
of 5 or greater.
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.
Features
n 741 op amp operating characteristics
n Low supply current drain: 0.6 mA/Amplifier
n Class AB output stage — no crossover distortion
n Pin compatible with the LM124
n Low input offset voltage: 1 mV
n Low input offset current: 4 nA
n Low input bias current: 30 nA
n Gain bandwidth product
LM148 (unity gain): 1.0 MHz
LM149 (AV ≥ 5): 4 MHz
n High degree of isolation between amplifiers: 120 dB
n Overload protection for inputs and outputs
Schematic Diagram
* 1 pF in the LM149
© 1999 National Semiconductor Corporation DS007786
DS007786-1
www.national.com
1 page  
Typical Performance Characteristics (Continued)
Common-Mode Rejection
Ratio
Open Loop Frequency
Response
Bode Plot LM148
Bode Plot LM149
DS007786-29
Large Signal Pulse
Response (LM148)
DS007786-30
Large Signal Pulse
Response (LM149)
DS007786-31
Small Signal Pulse
Response (LM148)
DS007786-32
Small Signal Pulse
Response (LM149)
DS007786-33
Undistorted Output
Voltage Swing
DS007786-34
DS007786-35
DS007786-36
DS007786-37
5 www.national.com
5 Page 
Typical Applications — LM148 (Continued)
A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros)
R1C1 = R2C2 = t
R'1C'1 = R'2C'2 = t'
fC = 1 kHz, fS = 2 kHz, fp = 0.543, fZ = 2.14, Q = 0.841, f' P = 0.987, f' Z = 4.92, Q' = 4.403, normalized to ripple BW
DS007786-14
Use the BP outputs to tune Q, Q', tune the 2 sections separately
R1 = R2 = 92.6k, R3 = R4 = R5 = 100k, R6 = 10k, R0 = 107.8k, RL = 100k, RH = 155.1k,
R'1 = R'2 = 50.9k, R'4 = R'5 = 100k, R'6 = 10k, R'0 = 5.78k, R'L = 100k, R'H = 248.12k, R'f = 100k. All capacitors are 0.001 µF.
Lowpass Response
DS007786-15
11
www.national.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LM248J.PDF ] | |
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