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LM246N

STMicroelectronics
Part Number LM246N
Manufacturer STMicroelectronics
Description PROGRAMMABLE QUAD BIPOLAR OPERATIONAL AMPLIFIERS
Published Mar 22, 2005
Detailed Description LM146 LM246 - LM346 PROGRAMMABLE QUAD BIPOLAR OPERATIONAL AMPLIFIERS . . . . . . . . . PROGRAMMABLE ELECTRICAL CHARACT...
Datasheet PDF File LM246N PDF File

LM246N
LM246N

Overview
LM146 LM246 - LM346 PROGRAMMABLE QUAD BIPOLAR OPERATIONAL AMPLIFIERS .
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PROGRAMMABLE ELECTRICAL CHARACTERISTICS BATTERY POWERED OPERATION LOW SUPPLY CURRENT (250µA/amplifier) GAIN-BANDWIDTH PRODUCT : 1MHz LARGE DC VOLTAGE GAIN : 120dB LOW NOISE VOLTAGE : 28nV/VHz WIDE POWER SUPPLY RANGE : ±1.
5V to ±22V CLASSE AB OUTPUT STAGE.
NO CROSSOVER DISTORTION OVERLOAD PROTECTION FOR INPUTS AND OUTPUTS N DIP16 (Plastic Package) D SO16 (Plastic Micropackage) ORDER CODES Part Number LM146 LM246 Temperature Range –55oC, +125oC –40 C, +105 C 0 C, +70 C o o o o Package N • • • D • • • DESCRIPTION The LM346 consists of four independent, high gain, internally compensated, low power programmable amplifiers.
Two external resistors (Rset) allow 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 bandwidth or optimize noise figure for a given source 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.
PROGRAMMING EQUATIONS : Total supply current = 1mA (Iset = 10µA) Gain-bandwidthproduct = 1MHz (Iset = 10µA) Slew rate = 0.
5V/µs (Iset = 10µA) Input bias current ≈30 nA (Iset = 10µA) Iset = current into pin 8 and pin 9 (see schematic diagram) Iset = VCC + − VCC − − 0.
6V Rset LM346 Example : LM246N PIN CONNECTIONS (top view) Output1 Inverting input 1 Non-invertinginput 1 V + CC Non-invertinginput 2 Inverting input 2 Output2 Set 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Output4 Inverting input 4 Non-invertinginput 4 VCC Non-invertinginput 3 Inverting input 3 Output 3 Set November 1997 1/9 LM146 - LM246 - LM346 SCHEMATIC DIAGRAM (1/4 LM146) Q15 Q16 V CC Q10 Inverting input Noninverting input R1 30Ω Q12 Q14 Q11 Q13 V CC V CC Q9 R set I set SET Q20 Q8 Q3 Q4 Q21 Q7 R2 1kΩ Q18 ...


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