OBSOLETE
LM748
www.ti.com
SNOS660C – NOVEMBER 1994 – REVISED APRIL 2013
LM748 Operational Amplifier
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FEATURES
DESCRIPTION
•
The LM48 is a general purpose operational amplifier
with external frequency compensation.
1
•
•
•
•
•
Frequency Compensation with a Single 30 pF
Capacitor
Operation from ±5V to ±20V
Continuous Short-Circuit Protection
Operation as a Comparator with Differential
Inputs as High as ±30V
No Latch-Up When Common Range is
Exceeded
Same Pin Configuration as the LM101
The unity-gain compensation specified makes the
circuit stable for all feedback configurations, even
with capacitive loads. It is possible to optimize
compensation for best high frequency performance at
any gain. As a comparator, the output can be
clamped at any desired level to make it compatible
with logic circuits.
The LM748C is specified for operation over the 0°C
to +70°C temperature range.
Connection Diagram
COMP
INVERTING INPUT
NON-INVERTING INPUT
V
-
1
8
2
7
3
4
+
COMP
+
V
6
5
OUTPUT
BALANCE
Figure 1. Dual-In-Line Package (Top View)
See Package Number P0008E
1
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.
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.
Copyright © 1994–2013, Texas Instruments Incorporated
OBSOLETE
LM748
SNOS660C – NOVEMBER 1994 – REVISED APRIL 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.
ABSOLUTE MAXIMUM RATINGS
(1) (2)
Supply Voltage
Power Dissipation
±22V
(3)
500 mW
Differential Input Voltage
Input Voltage
±30V
(4)
±15V
Output Short-Circuit Duration
See
Operating Temperature Range:
(5)
LM748C
0°C to +70°C
−65°C to +150°C
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
(1)
(2)
(3)
(4)
(5)
+300°C
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical characteristic specifications do not
apply when operating the device outside of its rated operating conditions.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
For operating at elevated temperatures, the device must be derated based on a maximum junction to case thermal resistance of 45°C
per watt, or 150°C per watt junction to ambient. (See Curves in the SPECIFIED PERFORMANCE CHARACTERISTICS section).
For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage.
Continuous short circuit is allowed for case temperatures to +125°C and ambient temperatures to +70°C.
ELECTRICAL CHARACTERISTICS
Parameter
(1)
Typ
Max
Units
Input Offset Voltage
TA = 25°C, RS ≤ 10 kΩ
1.0
5.0
mV
Input Offset Current
TA = 25°C
40
200
nA
Input Bias Current
TA = 25°C
120
500
Input Resistance
TA = 25°C
Supply Current
TA = 25°C, VS = ± 15V
Large Signal
Voltage Gain
TA = 25°C, VS = ± 15V
VOUT = ± 10V, RL ≥ 2 kΩ
Input Offset Voltage
RS ≤ 10 kΩ
Average Temperature
Coefficient of Input
Offset Voltage
RS ≤ 50Ω
3.0
µV/°C
RS ≤ 10 kΩ
6.0
µV/°C
Input Offset Current
TA = 0°C to +70°C
300
TA = −55°C to +125°C
500
nA
TA = 0°C to +70°C
0.8
µA
TA = −55°C to +125°C
1.5
µA
Input Bias Current
Supply Current
Conditions
Min
300
800
1.8
50
nA
kΩ
2.8
160
mA
V/mV
6.0
mV
nA
TA = +125°C, VS = ± 15V
1.2
2.25
mA
TA = −55°C to +125°C
1.9
3.3
mA
Large Signal
Voltage Gain
VS = ± 15V, VOUT = ± 10V
RL ≥ 2 kΩ
25
Output Voltage Swing
VS = ± 15V, RL = 10 kΩ
±12
±14
V
VS = ± 15V, RL = 2 kΩ
±10
±13
V
Input Voltage Range
VS = ± 15V
±12
Common-Mode
Rejection Ratio
RS ≤ 10 kΩ
70
90
dB
Supply Voltage
Rejection Mode
RS ≤ 10 kΩ
77
90
dB
(1)
2
V/mV
V
These specifications apply for ±5V ≤ VS ≤ +15V and 0°C ≤ TA ≤ +70°C, unless otherwise specified.
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OBSOLETE
LM748
www.ti.com
SNOS660C – NOVEMBER 1994 – REVISED APRIL 2013
TYPICAL APPLICATIONS
R1
R2
INPUT
2
-
6
LM748
REQ †
OUTPUT
3
+
1
8
R5
5
C1
30 pF
5.1 MW
R4
10 MW
-
V
R3
50 kW
†May be zero or equal to parallel combination of R1 and R2 for minimum offset.
Figure 2. Inverting Amplifier with Balancing Circuit
2
INPUTS
LM748
3
6
OUTPUT
+
8
D1
LM103
3.6
Figure 3. Voltage Comparable for Driving
DTL or TTL Integrated Circuits
OUTPUT
2
INPUTS
LM748
3
+
6
R1
60
Q1
2N2222
8
D1
FD777
D2
FD777
Figure 4. Voltage Comparable for Driving
RTL Logic or High Current Driver
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OBSOLETE
LM748
SNOS660C – NOVEMBER 1994 – REVISED APRIL 2013
www.ti.com
SPECIFIED PERFORMANCE CHARACTERISTICS
These specifications apply for ±5V ≤ VS ≤ +15V and 0°C ≤ TA ≤ +70°C, unless otherwise specified.
Input Voltage Range
Output Swing
20
16
OUTPUT SWING (rV)
INPUT VOLTAGE RANGE (rV)
20
12
UM
IM
IN
8
M
15
10
MU
NI
MI
5
5
10
15
0
20
5
M
RL
k
=2
20
Supply Current
2.5
SUPPLY CURRENT (mA)
94
88
82
MIN
M
IMU
76
5
10
15
o
TA = -55 C
2.0
o
TA = 25 C
1.5
o
TA = 125 C
1.0
0.5
70
5
20
10
15
20
SUPPLY VOLTAGE (rV)
SUPPLY VOLTAGE (rV)
Figure 7.
Figure 8.
Voltage Gain
Input Bias Current
120
o
TA = -55
C
o
C
T A = 25
INPUT BIAS CURRENT (nA)
400
110
100
o
T A = 125
C
90
80
15
Figure 6.
Voltage Gain
100
10
SUPPLY VOLTAGE (rV)
Figure 5.
VOLTAGE GAIN (dB)
0k
MU
NI
MI
SUPPLY VOLTAGE (rV)
VOLTAGE GAIN (dB)
=1
4
0
5
10
15
20
SUPPLY VOLTAGE (rV)
300
TA = -55oC
200
TA = 25oC
100
TA = 125oC
0
5
10
15
20
SUPPLY VOLTAGE (rV)
Figure 9.
4
M
RL
Figure 10.
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Product Folder Links: LM748
OBSOLETE
LM748
www.ti.com
SNOS660C – NOVEMBER 1994 – REVISED APRIL 2013
SPECIFIED PERFORMANCE CHARACTERISTICS (continued)
These specifications apply for ±5V ≤ VS ≤ +15V and 0°C ≤ TA ≤ +70°C, unless otherwise specified.
Current Limiting
Input Current
15.0
400
VS = r15V
INPUT CURRENT (nA)
OUTPUT SWING (rV)
VS = r15V
10.0
TA = 25oC
TA = 125oC
5.0
300
200
BIAS
100
OFFSET
0
0
5
10
15
20
25
0
-75
30
-50 -25
50
75 100 125
TEMPERATURE ( C)
Figure 11.
Figure 12.
Maximum Power Dissipation
Open Loop Frequency Response
120
600
TA = 25oC
100
500
400
VOLTAGE GAIN (dB)
POWER DISSIPATION (mW)
25
o
OUTPUT CURRENT (rmA)
LM748
300
200
VS = r15V
80
60
C1 = 3 pF
40
20
C1 = 30 pF
100
0
0
25
-20
45
65
85
105
1
125
10
AMBIENT TEMPERATURE (oC)
16
100
1k
10k 100k
10M
Figure 14.
Large Signal Frequency Response
Voltage Follower Pulse Response
10
o
TA = 25 C
8
VS = r15V
6
VOLTAGE SWING (V)
12
C1 = 3 pF
8
4
4
2
INPUT
0
OUTPUT
-2
-4
-6
C1 = 30 pF
0
1k
1M
FREQUENCY (Hz)
Figure 13.
OUTPUT SWING (rV)
0
10k
TA = 25oC
-8
100k
1M
10M
FREQUENCY (Hz)
VS = r15V
-10
0
10 20 30 40 50 60 70 80
TIME (Ps)
Figure 15.
Figure 16.
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OBSOLETE
LM748
SNOS660C – NOVEMBER 1994 – REVISED APRIL 2013
www.ti.com
REVISION HISTORY
Changes from Revision B (April 2013) to Revision C
•
6
Page
Changed layout of National Data Sheet to TI format ............................................................................................................ 5
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