ST LM146 LM246 LM346 Programmable Quad Bipolar Operational Amplifier Data Manual User Guide
Summary
This programmable quad bipolar operational amplifier offers highly adaptable amplification performance, perfect for precision circuit design. The manual details how to tailor critical electrical characteristics—such as gain-bandwidth product, slew rate, supply current, and noise figure—using external resistors. Ideal for engineers requiring a versatile, low-power solution with adjustable parameters and reliable high gain, making it suitable for diverse analog signal processing applications.
Page 1 Text Content
LM146 LM246 LM346
PROGRAMMABLE
QUAD BIPOLAR OPERATIONAL AMPLIFIER
PROGRAMMABLE ELECTRICAL CHARAC- TERISTICS LOW SUPPLY CURRENT (250µA/amplifier) GAIN-BANDWITH PRODUCT : 1MHz LARGE DC VOLTAGE GAIN : 120d B LOW NOISE VOLTAGE : 28n V/√Hz WIDE POWER SUPPLY RANGE / ±1.5V to ±22V CLASSE AB OUTPUT STAGE. NO CROSS-OVER DISTORTION OVERLOAD PROTECTION FOR INPUTS AND OUTPUTS DESCRIPTION The LM346 consists of four independent, high gain, internally compensated, low power program- mable amplifiers. Two external resistors (Rset) al- low the user to program the gain-bandwith prod- DIP16
uct, slew rate, supply current, input bias current, (Plastic Package)
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
PIN CONNECTIONS (top view)
the package the LM346 pin out is the same as the LM324 and LM348. PROGRAMMING EQUATIONS : Total supply current = 1m A (Iset = 10µA) Gain bandwith product = 1MHz (Iset = 10µA) Slew rate = 0.5V/µs (Iset = 10µΑ)
utput utput
Input bias current ≈30n A (Iset = 10µΑ)
Iset = current into pin 8 and pin 9 (see schematic Inverting Input Inverting Inpu
diagram) on-inverting inpu on-inverting inpu
Vcc+ Vcc-– 0.6V– Iset
on-inverting Inpu on-inverting input
Inverting Inpu Inverting inpu
ORDER CODE utput utpu
Set Set
Package
Part Temperature Number 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 1/4
Page Summary Contents For ST LM146 LM246 LM346 Programmable Quad Bipolar Operational Amplifier Data Manual User Guide
Manual Details
| Brand | QUAD |
|---|---|
| Pages | 4 |
| File Size | 145.91 KB |
| Published | June 04, 2026 |
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Frequently Asked Questions
How can I adjust characteristics like the supply current or gain-bandwidth product?
You can use two external resistors (R) to program parameters such as slew rate, supply current, and input bias current.
What is the equivalent input noise voltage of this amplifier?
The nominal output noise voltage is 28 nV/√Hz (measured at f = 1kHz, R = 100Ω).
What is the required minimum temperature range for use in industrial applications?
The LM246 variant operates between -40°C and +105°C, making it suitable for wider temperature ranges.
What is the maximum current I can safely pass through an output short circuit?
For a short circuit at room temperature, the output can handle up to 30 mA of short-circuit current.