SGS Thomson Microelectronics LM346D, LM346, LM346N, LM246, LM146 Datasheet

November1997

PROGR AMMABL E

QUAD BIPOLAR OPERAT ION AL AMPL IFI ERS

.PROGRAMMABLE ELECTRICAL CHARAC-

TERISTICS

.BATTERYPOWEREDOPERATION

.LOW SUPPLY CURRENT (250µA/amplifier)

.GAIN-BANDWIDTH PRODUCT: 1MHz

.LARGEDC VOLTAGEGAIN : 120dB

.LOW NOISEVOLTAGE: 28nV/VHz

.WIDE POWERSUPPLYRANGE:

±1.5Vto

±22V

.CLASSE AB OUTPUT STAGE. NO CROSS-

OVERDISTORTION

.OVERLOADPROTECTION FOR INPUTS AND

OUTPUTS

DESC RIP TI ON

The LM346consistsof fourindependent,highgain,
internallycompensated,low power programmable
amplifiers. Two external resistors (R

set

) allow the
user to program the gain-bandwith product, slew
rate,supply current,inputbias current,input offset
currentand input noise. For example the user can
trade-off supply current for bandwidth or optimize
noisefigurefora givensource resistance.In a simi­lar wayother amplifiercharacteristicscanbe
tailoredto theapplication.

Exceptfor thetwo programming pins at the end of
the packagethe LM346pin out is the sameas the
LM324and LM348.

PROGRAMMINGEQUATIONS:
Totalsupplycurrent= 1mA(I

set

=10µA)

Gain-bandwidthproduct = 1MHz (I

set

=10µA)

Slewrate = 0.5V/µs(I

set

=10µA)

Inputbias current ≈30 nA (I

set

=10µA)

I

set

=currentinto pin8 and pin 9

(see schematicdiagram)

I

set

=

V

CC

+

− V

CC

−

− 0.6V

R

set

4

5

6

7

9

10

11

12

13

15

1

2

3

8

16

14

Output1

Invertinginput 1

Non-invertinginput1

Non-invertinginput 2

Invertinginput 2

Output2

Set

Output4

Invertinginput 4

Non-invertinginput 4

V

CC

Non-invertinginput 3

Invertinginput 3

Output3

Set

V

CC

+

PIN C O NNEC TIO NS (top view)

ORDER CODES

Part

Number

Temperature

Range

Package

ND

LM146 –55

o

C, +125oC ••

LM246 –40

o

C, +105oC ••

LM346 0

o

C, +70oC ••

Example : LM246N

N

DIP16

(PlasticPackage)

D

SO16

(PlasticMicropackage)

LM146

LM246 - LM346

1/9

Notes : 1. For supply volt ages less than ±15V, the absolute maxi mum i nput voltage is equal t o the s upply vol tage.

2. Any of the ampl ifier output s can be shorted t o g r ound indefi nitly ; howev e r m or e t han one should n ot be
simul t aneous l y shorted as the maximum junction temperat ur e wi ll be exceeded.

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter LM146 LM246 LM346 Unit

V

CC

Supply Voltage ±22 ±22 ±22

V

V

i

Input Voltage - (note 1) ±15 ±15 ±15 V

V

id

Differential Input Voltage ±30 ±30 ±30 V
Output Short-circuit Duration - (note 2) Infinite

P

tot

Power Dissipation

N/D Suffix 500

mW

T

oper

Operating Free-air Temperature Range –55 to +125 –40 to +105 0 to +70

o

C

T

stg

Storage Temperature Range –65 to +150 –65 to +150 –65 to +150

o

C

V

CC

V

CC

V

CC

or

Q18 Q19

Toother op amps

V

CCVCC

Output

R

set

R

set

I

set

I

set

SET

SET

R1

30Ω

Q12

Q10

Q11

Q9

Q16

Q15

Q14

Q13

8pF

C

C

Non-

inverting

input

Q20

Q6

Q8

Q5

R2

1kΩ

Q7Q21

Q4

Q3

Q17

V

CC

V

CC

Q1 Q2

Inverting

input

SCHE MATIC DIAGRAM ( 1/4 LM146)

LM146 - LM246 - LM346

2/9

ELECTRICAL CHARACTERISTICS

V

CC

= ±15V, I

set

=10µA, T

amb

= +25oC (unlessotherwise specified)

Symbol Parameter

LM146 LM246 - LM346

Unit

Min. Typ. Max. Min. Typ. Max.

V

io

Input Offset Voltage (RS≤ 10kΩ)

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

0.5 3
5

0.5 5
6

mV

I

io

Input Offset Current

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

220

25

2 100

100

nA

I

ib

Input Bias Current

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

30 100

100

30 250

250

nA

A

vd

Large Signal Voltage Gain
(V

o

= ±10V, RL= 10kΩ)

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

100501000 50251000

V/mV

SVR Supply Voltage Rejection Ratio (R

S

≤ 10kΩ)

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

8080110 8080110

dB

I

CC

Supply Current, all Amp, no Load

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

12

2

12

2

mA

V

icm

Input Common Mode Voltage Range

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

±13.5
±13.5

±13.5
±13.5

V

CMR Common Mode Rejection Ratio (R

S

≤ 10kΩ)

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

8070110 8070110

dB

I

OS

Output Short-circuit Current

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

10

4

20 30

35

10

4

20 30

35

mA

± V

opp

Output Voltage Swing (RL= 10kΩ)

T

amb

=25oC

T

min

. ≤ T

amb

≤ T

max.

12
12

14 12

12

14

V

SR Slew Rate (V

I

= ±10V, RL= 10kΩ,CL= 100pF,

unity Gain) 0.3 0.5 0.3 0.5

V/µs

R

I

Input Resistance 1 1 MΩ

C

I

Input Capacitance 2 2 pF

V

o1/Vo2

Channel Separation (RL= 10kΩ,Vo= 12Vpp) 120 120 dB

GBP Gain Bandwidth Product

(V

I

= 10 mV, RL= 10kΩ,CL= 100pF

f = 100kHz) 0.8 1 0.5 1

MHz

THD Total Harmonic Distortion

(f = 1kHz, A

v

= 20dB, RL= 10kΩ

C

L

= 100pF, vo=2Vpp) 0.015 0.015

%

e

n

Equivalent Input Noise Voltage
(f = 1kHz, R

s

= 100Ω)

28 28

nV

√Hz

LM146 - LM246 - LM346

3/9