LM146
LM246
LM346
PROGRAMMABLE
QUAD BIPOLAR OPERATIONAL AMPLIFIER
s
PROGRAMMABLE ELECTRICAL CHARAC-
TERISTICS
LOW SUPPLY CURRENT (250µA/amplifier)
GAIN-BANDWITH PRODUCT : 1MHz
LARGE DC VOLTAGE GAIN : 120dB
LOW NOISE VOLTAGE : 28nV/√Hz
WIDE POWER SUPPLY RANGE / ±1.5V to
±22V
s
CLASSE AB OUTPUT STAGE. NO
CROSS-OVER DISTORTION
s
OVERLOAD PROTECTION FOR INPUTS
AND OUTPUTS
s
s
s
s
s
DESCRIPTION
The LM346 consists of four independent, high
gain, internally compensated, low power program-
mable amplifiers. Two external resistors (R
set
) al-
low the user to program the gain-bandwith prod-
uct, slew rate, supply current, input bias current,
input offset current and input noise. For example
the user can trade-off supply current for bandwith
or optimize noise figure for a given source resis-
tance. In a similar way other amplifier characteris-
tics can be tailored to the application.
Except for the two programming pins at the end of
the package the LM346 pin out is the same as the
LM324 and LM348.
PROGRAMMING EQUATIONS :
Total supply current = 1mA (I
set
= 10µA)
Gain bandwith product = 1MHz (I
set
= 10µA)
Slew rate = 0.5V/µs (I
set
= 10µΑ)
Input bias current
≈30nA
(I
set
= 10µΑ)
I
set
= current into pin 8 and pin 9 (see schematic
diagram)
Vcc+
–
Vcc
-
–
0.6 V
Ise t = ----------------------------------------------------
-
R
set
N
DIP16
(Plastic Package)
PIN CONNECTIONS
(top view)
O u tp u t 1
In v e rtin g In p u t 1
N o n -in v e rtin g in p u t 1
V CC+
N o n -in v e rtin g In p u t 2
In v e rtin g In p u t 2
1
2
3
4
5
6
7
8
-
+
-
+
16
15
14
13
12
11
10
9
O u tp u t 4
In v e rtin g In p u t 4
N o n -in v e rtin g in p u t 4
V CC -
N o n -in v e rtin g in p u t 3
In v e rtin g in p u t 3
O u tp u t 3
Set
ORDER CODE
Part
Number
Temperature
Range
Package
N
•
•
•
O u tp u t 2
Set
LM146
-55°C, +125°C
LM246
-40°C, +105°C
LM346
0°C, +70°C
Example :
LM246N
N =
Dual in Line Package (DIP))
April 2003
1/4
LM146-LM246-LM346
SCHEMATIC DIAGRAM
(1/4 LM146)
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
i
V
id
Supply voltage
l Input Voltage
1)
Differential Input Voltage
Output Short-circuit Duration
2)
P
tot
Power Dissipation
Opearting Free-air Temperature Range
LM146
LM246
LM346
Storage Temperature Range
Parameter
Value
±22
±15
±30
Infinite
500
-55 to +125
40 to +105
0 to +70-
-65 to +150
mW
Unit
V
V
V
T
oper
T
stg
1.
2.
°C
°C
For supply voltage less than ±15V, the absolute maximum input voltage is equal to the supply voltage.
Any of the amplifier outputs can be shorted to ground indefinitly; however more than one should not be simultaneously shorted as the maximum
junction will be exceeded.
2/4
LM146-LM246-LM346
ELECTRICAL CHARACTERISTICS
V
CC
+
= ±15V, I
set
= 10µA, T
amb
= +25°C (unless otherwise specified)
LM146
Symbol
Parameter
Min.
V
io
Input Offset Voltage (R
s
≤
10kΩ)
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Input Offset Current
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Input Bias Current
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Large Signal Voltage Gain
(V
o
= ±10V, R
L
= 10kΩ)
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Supply Voltage Rejection Ratio (R
s
≤
10kΩ)
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Supply Current, all Amp, no load
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Input Common Mode Voltage Range
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Common Mode Rejection Ratio (R
s
≤
10kΩ)
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Output Short-circuit Current
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Output Voltage Swing (R
L
≤
10kΩ)
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Slew Rate (V
I
= ±10V, R
L
= 10kΩ, C
L
= 100pF,
unity Gain)
Input Resistance
Input Capacitance
±13.5
±13.5
80
70
10
4
12
12
0.3
110
Typ.
0.5
Max.
3
5
20
25
100
100
Min.
Typ.
0.5
Max.
mV
5
6
nA
2
2
100
100
nA
30
30
250
250
V/mV
100
50
80
80
1000
50
25
80
80
2
2
±13.5
±13.5
dB
80
70
30
35
10
4
12
12
0.3
110
mA
20
20
30
35
V
14
14
V/µs
0.5
1
2
120
0.5
1
2
120
MΩ
pF
dB
MHz
0.8
1
0.5
1
%
0.015
28
0.015
28
nV
-----------
-
Hz
1000
dB
110
110
mA
1
1
2
2
LM246 - LM346
Unit
I
io
I
ib
A
vd
SVR
I
cc
V
icm
CMR
I
os
±V
opp
SR
R
I
C
I
V
o1
/V
o2
Channel Separation (R
L
= 10kΩ, Vo = 12V
pp
)
GBP
Gain Bandwith Product
(V
I
= 10 mV, R
L
= 10kΩ, C
L
= 100pF
f =100kHz)
Total Harmonic Distortion
(f = 1kHz, A
v
= 20dB, R
L
= 10kΩ
C
L
= 100pF, V
o
= 2V
pp
)
Equivalent Input Noise Voltage
(f = 1kHz, R
s
= 100Ω
THD
e
n
3/4
LM146-LM246-LM346
PACKAGE MECHANICAL DATA
16 PINS - PLASTIC PACKAGE
Millimeters
Dim.
Min.
a1
B
b
b1
D
E
e
e3
F
i
L
Z
0.51
0.77
0.5
0.25
20
8.5
2.54
17.78
7.1
5.1
3.3
1.27
Typ.
Max.
1.65
Min.
0.020
0.030
Inches
Typ.
Max.
0.065
0.020
0.010
0.787
0.335
0.100
0.700
0.280
0.201
0.130
0.050
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2003 STMicroelectronics - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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4/4
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