LM349N National Semiconductor, LM349N Datasheet - Page 3

• Manufacturer Part Number: LM349N
• Description: IC OP AMP QUAD 741 HS 14DIP
• Manufacturer: National Semiconductor

Specifications of LM349N

• Amplifier Type: General Purpose
• Number Of Circuits: 4
• Slew Rate: 2 V/µs
• Gain Bandwidth Product: 4MHz
• Current - Input Bias: 30nA
• Voltage - Input Offset: 1000µV
• Current - Supply: 2.4mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 10 V ~ 36 V, ±5 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 14-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -
• Other names: *LM349N; LM349

Large Signal Voltage Gain V
Output Voltage Swing
Input Voltage Range
Common-Mode Rejection
Ratio
Supply Voltage Rejection
Electrical Characteristics
Note 1 Any of the amplifier outputs can be shorted to ground indefinitely however more than one should not be simultaneously shorted as the maximum junction
temperature will be exceeded
Note 2 The maximum power dissipation for these devices must be derated at elevated temperatures and is dicated by T
T
Note 3 These specifications apply for V
Note 4 Refer to RETS 148X for LM148 military specifications and refer to RETS 149X for LM149 military specifications
Note 5 Human body model 1 5 k
Cross Talk Test Circuit
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 In those applications where 741 op
amps have been employed the LM148 series op amps can
be employed directly with no change in circuit performance
The LM149 series has the same characteristics as the
LM148 except it has been decompensated to provide a
wider bandwidth As a result the part requires a minimum
gain of 5
The package pin-outs are such that the inverting input of
each amplifier is adjacent to its output In addition the am-
plifier outputs are located in the corners of the package
which simplifies PC board layout and minimizes package
related capacitive coupling between amplifiers
The input characteristics of these amplifiers allow differen-
tial input voltages which can exceed the supply voltages In
addition if either of the input voltages is within the operating
common-mode range the phase of the output remains cor-
rect If the negative limit of the operating common-mode
range is exceeded at both inputs the output voltage will be
positive For input voltages which greatly exceed the maxi-
mum supply voltages either differentially or common-mode
resistors should be placed in series with the inputs to limit
the current
Like the LM741 these amplifiers can easily drive a 100 pF
capacitive load throughout the entire dynamic output volt-
age and current range However if very large capacitive
loads must be driven by a non-inverting unity gain amplifier
A
The maximum available power dissipation at any temperature is P
Parameter
R
V
V
R
R
S
L l
S
S
S s
S s
in series with 100 pF
e
e
e
2 k
S
10 k
10 k
g
g
g
e
15V V
15V R
15V
g
Conditions
15V and over the absolute maximum operating temperature range (T
g
R
OUT
L
L
5V
(Note 3) (Continued)
e
e
s
e
10 k
2 k
V
g
S s g
TL H 7786 – 6
10V
d
15V
e
(T
jMAX
g
g
g
Min
25
70
77
3
LM148 LM149
12
10
12
b
T
Crosstalk
V
a resistor should be placed between the output (and feed-
back connection) and the capacitance to reduce the phase
shift resulting from the capacitive loading
The output current of each amplifier in the package is limit-
ed Short circuits from an output to either ground or the
power supplies will not destroy the unit However if multiple
output shorts occur simultaneously the time duration should
be short to prevent the unit from being destroyed as a result
of excessive power dissipation in the IC chip
As with most amplifiers care should be taken lead dress
component placement and supply decoupling in order to
ensure stability For example resistors from the output to an
input should be placed with the body close to the input to
minimize ‘‘pickup’’ and maximize the frequency of the feed-
back pole which capacitance from the input to ground cre-
ates
A feedback pole is created when the feedback around any
amplifier is resistive The parallel resistance and capaci-
tance from the input of the device (usually the inverting in-
put) to AC ground set the frequency of the pole In many
instances the frequency of this pole is much greater than
the expected 3 dB frequency of the closed loop gain and
consequently there is negligible effect on stability margin
However if the feedback pole is less than approximately six
times the expected 3 dB frequency a lead capacitor should
be placed from the output to the input of the op amp The
value of the added capacitor should be such that the RC
time constant of this capacitor and the resistance it parallels
is greater than or equal to the original feedback pole time
constant
A
S
g
g
Typ
)
90
96
e
13
12
jA
g
or the 25 C P
15V
e b
Max
20 log
g
g
g
Min
15
70
77
12
10
12
dMAX
101
e
LM248
c
OUT
g
g
Typ
whichever is less
90
96
e
13
12
OUT
L s
(dB)
jMAX
Max
T
A s
T
jA
H
g
g
g
Min
) unless otherwise noted
and the ambient temperature
15
70
77
LM348 LM349
12
10
12
g
g
Typ
90
96
13
12
Max
TL H 7786– 7
V mV
Units
dB
dB
V
V
V