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KA248/KA348
Quad Operational Amplifier
www.fairchildsemi.com
Features
• KA741 OP Amp operating characteristics
• Low supply current drain
• Class AB output stage no crossover distortion
• Pin compatible with the KA324 & KA3403
• Low input offset voltage : 1mV Typ.
• Low input offset current : 4nA Typ.
• Low input bias current : 30nA Typ.
• Gain bandwidth (unity gain): 1.0MHz Typ.
• High degree of isolation bet ween amplifiers: 120dB
• Overload protection for inputs and outputs
Description
The KA248/KA348 is a true quad KA741. 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
KA741 operational amplifier. In addition the total supply
current for all four amplifiers is comparable to the supply
current of a single KA741 type OP Amp. Other features
include input offset currents and input bias current which are
much less than those of a standard KA741. Also, excellent
isolation between amplifiers has been achieved by
independently biasing each amplifier and using layout
techniques which minimize thermal coupling.
14-DIP
1
14-SOP
Internal Block Diagram
©2001 Fairchild Semiconductor Corporation
1
Rev. 1.0.1
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KA248/KA348
Schematic Diagram
(One Section Only)
Absolute Maximum Ratings
Parameter Symbol Value Unit
Supply Voltage V
Differential Input Voltage V
Input Voltage V
Output Short Circuit Duration - Continuous Operating Temperature
KA248
KA348
Storage Temperature T
CC
I(DIFF)
I
T
OPR
STG
±18 V
36 V
±18 V
- 25 ~ +85
0~ +70
- 65~ +150 °C
°C
°C
2
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Electrical Characteristics
(VCC =15V, VEE= -15V, TA=25
°C, unless otherwise specified)
KA248/KA348
Parameter Symbol Conditions
Input Offset Voltage V
Input Offset Current I
Input Bias Current I
BIAS
Input Resistance R
Supply Current (all Amplifiers) I
Large Signal Voltage Gain G
IO
IO
CC
R
≤10KΩ -16.0-16.0
S
NOTE 1 - - 7.5 - - 7.5
NOTE 1 - - 125 - - 100
NOTE 1 - - 500 - - 400
I
- 0.8 2.5 - 0.8 2.5 - MΩ
- - 2.4 4.5 - 2.4 4.5 mA
R
≥2KΩ 25 160 - 25 160 -
V
L
NOTE 1 15 - - 15 - -
KA248 KA348
Min. Typ. Max. Min. Typ. Max.
- 4 50 - 4 50
- 30 200 - 30 200
Unit
mV
nA
nA
V/mV
Channel Separation CS f = 1KHz to 20KHz - 120 - - 120 - dB
Common Mode Input
Voltage Range
V
I(R)
Small Signal Bandwidth BW G
Phase Margin (Note2) MPH G
Slew Rate (Note2) SR G
Output Short Circuit Current I
Output Volt ag e Swin g V
SC
O(P-P)
Common Mode Rejection Ratio CMRR R
Power Supply Rejection Ratio PSRR R
NOTE 1 ±12 - - ±12 - - V
= 1 - 1.0 - - 1.0 - MHz
V
= 1 - 60 - - 60 - Degree
V
= 1 - 0.5 - - 0.5 - V/µs
V
- - 25 - - 25 - mA
R
≥10KΩ NOTE 1 ±12 ±13 - ±12 ±13 -
L
≥2KΩ±10 ±12 - ±10 ±12 -
R
L
≥10KΩ NOTE 1 70 90 - 70 90 - dB
S
≥10KΩ NOTE 1 77 96 - 77 96 - dB
S
V
Note :
1. KA348: 0 ≤ T
2. Guaranteed by design.
≤ +70
A
°C , KA248: -25 ≤ T
≤ +85
A
°C
3
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KA248/KA348
Typical Performance Characteristics
Supply Voltage (V) Supply Voltage (V)
Figure 1. Supply Current vs Supply voltage Figure 2. Output Voltage Swing vs Supply voltage
Source Current (mA)
Figure 3. Output voltage swing vs Source Current (mA)
Frequency (Hz) Frequency (Hz)
Figure 5. Output Impedance vs Freque ncy Figure 6. Common-mode Rejection R atio vs Frequency
Figure 4. Output voltage swing vs Sink Current (mA)
Sink Current (mA)
4
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Typical Performance Characteristics (continued)
Figure 7. Open Loop Frequency Response Figure 8. Bode Plot
KA248/KA348
Figure 9. Large Signal Pulse Response Figure 10. Small Signal Pulse Response
Figure 11. Undistort ed Output Voltag e Sw ing vs Frequency Figure 12. Inverti ng Large Signal Pulse Response
5
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KA248/KA348
Typical Performance Characteristics (continued)
Figure 13. Input Noise Voltage And Noise Current vs Fre-
quency
Figure 15. Negative Common.mode Input Voltage Limit vs
Negative Supply Voltage
Figure 14. Positive Commo n Mode Input Voltage Limit
vs Positiue Supply Voltage
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Mechanical Dimensions
Package
6.40
±0.20
0.252
±0.008
14-DIP
2.08
0.082
()
KA248/KA348
#1
#7
7.62
0.300
#14
#8
MAX
19.80
0.780
5.08
0.200
±0.20
19.40
3.25
0.128
±0.008
0.764
±0.20
±0.008
MAX
0.20
0.008
3.30
0.130
±0.10
0.46
2.54
MIN
±0.30
±0.012
±0.004
0.018
0.100
±0.10
1.50
±0.004
0.059
0~15°
0.25
0.010
+0.10
–0.05
+0.004
–0.002
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KA248/KA348
Mechanical Dimensions
Package
#1
(Continued)
14-SOP
#14
1.55
0.061
MAX
8.70
0.343
±0.10
±0.004
±0.20
8.56
±0.008
0.337
MIN
0.05
0.002
0.47
()
0.10
0.004
-0.05
+
+
0.406
0.016
0.019
-0.002
0.10
+
-0.05
0.20
0.60
0.024
0.004
+
-0.002
0.008
±0.20
±0.008
#7
6.00
0.236
3.95
0.156
5.72
0.225
±0.30
±0.012
±0.20
±0.008
#8
0~8°
1.80
0.071
MAX
MAX0.10
MAX0.004
1.27
0.050
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Ordering Information
Product Number Package Operating Temperature
KA348 14 DIP
KA348D 14 SOP
KA248 14 DIP
KA248D 14 SOP
0 ~ + 70
-25 ~ +85
o
C
o
C
KA248/KA348
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KA248/KA348
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.
LIFE SUPPORT POL I CY
FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein :
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
2. A critical component in any component of a life support
device or sy stem whose fai lure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
www.fairchildsemi.com
6/1/01 0.0m 001
2001 Fairchild Semiconductor Corporation
Stock#DSxxxxxxxx
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