ST LM146, LM246, LM346 Operation Manual
I
set
Vcc+Vcc
-– 0.6V–
R
set
-----------------------------------------------------=
LM146
LM246
LM346
PROGRAMMABLE
QUAD BIPOLAR OPERATIONAL AMPLIFIER
■ PROGR AMMAB L E ELECTRICAL CHARA C-
TERISTICS
■ LOW SUPPLY CURRENT (250µA/amplifier)
■ GAIN-BANDWITH PRODUCT : 1MHz
■ LARGE DC VOLT AGE GAIN : 120dB
■ LOW NOISE VOLTAGE : 28nV/√Hz
■ WIDE POWER SUPPLY RANGE / ±1.5V to
±22V
■ CLASSE AB OUTPUT STAGE. NO
CROSS-OVER DISTORTION
■ OVERLOAD PROT ECTION FOR INPUTS
AND OUTPUTS
DESCRIPTION
The LM346 consists of four independent, high
gain, internally compensated, low power programmable amplifiers. Two external resistors (R
low the user to program the gain-bandwith product, 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 s ource resistance. In a similar way other amplifier characteristics 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.
set
) al-
N
DIP16
(Plastic Package)
PIN CONNECTIONS (top view)
PROGRAMMING EQUATIONS :
Total supply current = 1mA (I
Gain bandwith product = 1MHz (I
Slew rate = 0.5V/µs (I
= 10µΑ)
set
Input bias current ≈30nA (I
I
= current into pi n 8 and pi n 9 (see schematic
set
set
= 10µΑ)
set
= 10µA)
= 10µA)
set
diagram)
ORDER CODE
Part
Number
Temperature
Range
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
Package
N
•
•
•
Output 1
Inverting Input 1
Non-inverting input 1
V
CC
Non-inverting Input 2
Inverting Input 2
Output 2
Set
Output 4
-
+
16
Inverting Input 4
15
Non-inverting input 4
14
-
13
V
CC
No n-inv erting in pu t 3
12
Inverting input 3
11
Output 3
10
Set
9
1
2
-
+
3
+
4
5
6
7
8
1/4
LM146-LM246-LM346
SCHEMATIC DIAGRAM (1/4 LM146)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
V
i
V
id
P
tot
T
oper
T
stg
1. For supply voltage less than ±15V, the absolute maximum input voltage is equal to the supply voltage.
2. 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.
Supply voltage ±22 V
l Input Voltage
1)
±15 V
Differential Input Voltage ±30 V
Output Short-circu it Duration
2)
Power Dissipation 500
Infinite
mW
Opearting Free-air Temperature Range
LM146
LM246
LM346
-55 to +125
40 to +105
0 to +70-
°C
Storage Temperature Range -65 to +150 °C
2/4
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