Linear Technology LT1490CN8 Linear IC DIP8 Dual R-to-R I/O OA LT1490CN8 Data Sheet

12

LT1490/LT1491

14901fb LT/LCG 0600 2K REV B • PRINTED IN USA

 

LINEAR TECHNOLOGY CORPORATION 1996

LT1078/LT1079

Dual/Quad 55

µ

A Max, Single Supply, Precision Op Amps

Input/Output Common Mode Includes Ground, 70

µ

V V

OS(MAX)

and 2.5

µ

V/

°

C Drift (Max), 200kHz GBW, 0.07V/

µ

s Slew Rate

LTC1152

Rail-to-Rail Input, Rail-to-Rail Output, Zero-Drift Amplifier

High DC Accuracy, 10

µ

V V

OS(MAX)

, 100nV/

°

C, 1MHz GBW,

1V/

µ

s Slew Rate, Supply Current 2.2mA (Max), Single Supply,

Can Be Configured for C-Load

TM

 Operation

LT1178/LT1179

Dual/Quad 17

µ

A Max, Single Supply, Precison Op Amps

Input/Output Common Mode Includes Ground, 70

µ

V V

OS(MAX)

and 4

µ

V/

°

C Drift (Max), 85kHz GBW, 0.04V/

µ

s Slew Rate

LT1366/LT1367

Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps

475

µ

V V

OS(MAX)

, 500V/mV A

VOL(MIN)

, 400kHz GBW

LT1490A/LT1491A

Dual/Quad Micropower Rail-to-Rail Precision Op Amps

500

µ

V V

OS(MAX)

, Improved Version of the LT1490/LT1491

C-Load is a trademark of Linear Technology Corporation.

–

+

–

+

–

+

–

+

1490/1491 TA03

R6

10k

R2

47k

R7

16k

R8

620k

R4

1.6M

R1
33k

R3
10k

R5
100k

R10
620k

C4

0.068

µ

F

9

10

6

7

8

1

5

C3
0.047

µ

F

C5

0.01

µ

F

R13

130k

R12

10k

R15
47k

R14
10k

R24

420

C7

47

µ

F

LOAD

UP TO
TEN
PHONES

R23
4.7k

R26
2k

Q5
2N3904

Q4
2N3906

Q2

IRF9620

–180V

POWER AMPLIFIER

SMOOTHING FILTER

20Hz OSCILLATOR

CADENCE OSCILLATOR

*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
  SEE DESIGN NOTE DN134 FOR AN EXPLANATION OF THE CIRCUIT 

R18

100

Ω

R17

620

Ω

R16

100k

Z1

15V

100k

R25
4.7k

C6
0.033

µ

F

R21
150

Ω

R19
620

Ω

Z2

15V

R9

300k

R11

10k

D1

1N4148

C2

0.47

µ

F

C1
1

µ

F

2

3

1/4 LT1491

1/4 LT1491

12

4

11

13

Q1

IRF628

Q3

2N3904

60V

14

1/4 LT1491

1/4 LT1491

OPTO1*

R20

100k

Linear Technology  Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417 

●

 (408) 432-1900

FAX: (408) 434-0507 

● 

TELEX: 499-3977 

●  

www.linear-tech.com