November 1997

PROGRAMMABLE

QUAD BIPOLAR OPERATIONAL AMPLIFIERS

.

PROGRAMMABLE ELECTRICAL CHARAC-

TERISTICS

.

BATTERY POWERED OPERATION

.

LOW SUPPLY CURRENT (250

µA/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 CROSS-

OVER DISTORTION

.

OVERLOAD PROTECTION FOR INPUTS AND

OUTPUTS

DESCRIPTION

The LM346 consists of four independent, high gain,

internally compensated, low power programmable

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 simi-

lar 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 :

µA)

µA)

Slew rate = 0.5V/

Input bias current

(see schematic diagram)

=

CC

4

5

6

7

9

10

11

12

13

15

1

2

3

8

16

14

Output 1

Inverting input 1

Non-invertinginput 1

Non-invertinginput 2

Inverting input 2

Output 2

Set

Output 4

Inverting input 4

Non-invertinginput 4

VCC

Non-invertinginput 3

Inverting input 3

Output 3

Set

V

CC

+

PIN CONNECTIONS (top view)

ORDER CODES

Part

Number

Temperature

Range

Package

ND

LM146

–55

••

LM246

–40

••

LM346

0

••

Example : LM246N

N

DIP16

(Plastic Package)

D

SO16

(Plastic Micropackage)

LM146

LM246 - LM346

1/9