Document
DifferentialĂInput OperationalĂAmplifiers
The LM348 series is a true quad MC1741. Integrated on a single monolithic chip are four independent, low power operational amplifiers which have been designed to provide operating characteristics identical to those of the industry standard MC1741, and can be applied with no change in circuit performance. In addition, the total supply current for all four amplifiers is comparable to the supply current of a single MC1741. Other features include input offset currents and input bias currents which are much less than the MC1741 industry standard.
The LM348 can be used in applications where amplifier matching or high packing density is important. Other applications include high impedance buffer amplifiers and active filter amplifiers.
• Each Amplifier is Functionally Equivalent to the MC1741 • Low Input Offset and Input Bias Currents • Class AB Output Stage Eliminates Crossover Distortion • Pin Compatible with MC3403 and LM324 • True Differential Inputs • Internally Frequency Compensated • Short Circuit Protection • Low Power Supply Current (0.6 mA/Amplifier)
Order this document by LM348/D
LM348 LM248
DIFFERENTIAL INPUT OPERATIONAL AMPLIFIERS
SEMICONDUCTOR TECHNICAL DATA
14 1
N SUFFIX PLASTIC PACKAGE
CASE 646
14 1
D SUFFIX PLASTIC PACKAGE
CASE 751A (SO–14)
Representative Schematic Diagram (1/4 of Circuit Shown)
Noninverting Input
Inverting Input
4.5 k 39 k 30 pF
7.5 k
10 k 50 k 1.0 k 5.0 k
50 k 50
MOTOROLA ANALOG IC DEVICE DATA
PIN CONNECTIONS
VCC
25 Output 50
VEE
Out 1 1
Inputs 1
2 *)1
3
VCC 4
Inputs 2
5 6
)*2
Out 2 7
14 Out 4
13
*)4 12
Inputs 4
11 VEE
10
)*3 9
Inputs 3
8 Out 3
(Top View)
ORDERING INFORMATION
Device
Operating Temperature Range
Package
LM248N
LM348D LM348N
TA = –25° to +85°C TA = 0° to +70°C
Plastic DIP
SO–14 Plastic DIP
© Motorola, Inc. 1995
1
LM348 LM248
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Symbol
Value
Power Supply Voltage
VCC VEE
+18 –18
Input Differential Voltage Input Common Mode Voltage Output Short Circuit Duration Operating Ambient Temperature Range Storage Temperature Range Junction Temperature
VID VICM tSC
TA Tstg TJ
±36 ±18 Continuous –25 to +85 0 to +70 –55 to +125 150
Unit Vdc
V V
°C °C °C
ELECTRICAL CHARACTERISTICS (VCC = +15 V, VEE = –15 V, TA = 25°C, unless otherwise noted.)
Characteristic
Symbol Min Typ
Input Offset Voltage (RS ≤ 10 k)
VIO – 1.0
Input Offset Current Input Bias Current Input Resistance
Common Mode Input Voltage Range Large Signal Voltage Gain (RL ≥ 2.0 k, VO = ±10 V)
IIO IIB ri
VICR
AVOL
– 4.0 – 30 0.8 2.5
±12 – 25 160
Channel Separation (f = 1.0 Hz to 20 kHz)
– – –120
Common Mode Rejection (RS ≤ 10 k) Supply Voltage Rejection (RS ≤ 10 k)
Output Voltage Swing (RL ≥ 10 k) (RL ≥ 2 k)
Output Short Circuit Current
Supply Current (All Amplifiers)
CMR PSR VO
ISC ID
70 90 77 96
±12 ±13 ±10 ±12
– 25 – 2.4
Small Signal Bandwidth (AV = 1) Phase Margin (AV = 1) Slew Rate (AV = 1)
BW – 1.0 φm – 60 SR – 0.5
Max Unit 6.0 mV 50 nA 200 – MΩ –V – V/mV – dB – dB –
V – – – mA 4.5 mA – MHz – Degrees – V/µs
ELECTRICAL CHARACTERISTICS (VCC = +15 V, VEE = –15 V, TA = *Thigh to Tlow, unless otherwise noted.)
Characteristic
Symbol Min Typ
Max
Unit
Input Offset Voltage (RS ≤ 10 kΩ)
VIO – – 7.5 mV
Input Offset Current LM248 LM348
Input Bias Current LM248 LM348
IIO nA – – 125
– – 100
IIB – – 500
– – 400
Common Mode Input Voltage Range
VICR ±12 –
–V
Large Signal Voltage Gain (RL ≥ 2 k, VO = ±10 V)
AVOL
15
–
– V/mV
Common Mode Rejection (RS ≤ 10 k) Supply Voltage Rejection (RS ≤ 10 k)
CMR PSR
70 90 77 96
– dB –
Output Voltage Swing
(RL ≥ 10 k) (RL ≥ 2 k)
VO V
±12 ±13
–
±10 ±12
–
* Thigh = 85°C for LM248, and 70°C for LM348. Tlow = –25°C for LM248, and 0°C for LM348.
NOTE: Any of the amplifier outputs can be shorted to ground indefinitely; however, more than one should not be simultaneously shorted or the maximum junction temperature will be exceeded.
2 MOTOROLA ANALOG IC DEVICE DATA
VO, OUTPUT VOLTAGE (Vpp) A vol, VOLTAGE GAIN (dB)
LM348 LM248
Figure 1. Power Bandwidth (Large Signal Swing versus Frequency)
28
24
20 16 12 8.0 4.0
0 10
Voltage Follower THD < 5%
100 1.0 k 10 k f, FREQUENCY (Hz)
100 k
Figure 2. Open Loop Frequency Response 120 100
80
60
40
20 0
–20 1.0
10 100 1.0 k 10 k 100 k 1.0 M 10 M f, FREQUENCY (Hz)
Figure 3. Positive Output Voltage Swing versus Load Resistance
15 14 13 12 11 10 9.0 8.0 7.0 6.0
5.0 4.0 3.0 2.0 1.0 100
200
±15 V Supplies ±12 V ± 9.0 V ± 6.0 V
500 700 1.0 k 2.0 k 5.0 k 7.0 k 10 k
RL, LOAD RESISTANCE (Ω)
VO, OUTPUT VOLTAGE (Vpp)
Figure 4. Negative Output Voltage Swing versus Load Resistance
–15 –14
–13 –12
–11 –10 –9.0
–8.0
–7.0
–6.0 –5.0
–4.0
–3.0 –2.0 –1.0
100
200
500 700 1.0 k
±15 V Supplies ±12 V ± 9.0 V ± 6.0 V
2.0 k 5.0 k 7.0 k 10 k
RL, LOAD RESISTANCE (Ω)
VO, OUTPUT VOLTAGE (Vpp)
SUPPLY
VO, OUTPUT VOLTAGE SWING (Vpp)
Figure 5. Output Voltage Swing versus Load Resistance .