LT1490ACMS8 datasheet(16/16 Pages) LINER

16 / 16 page

LT1490A/LT1491A

sn1490, 14901afbs

LT/TP 0105 REV B • PRINTED IN USA

©LINEAR TECHNOLOGY CORPORATION 2000

Ring-Tone Generator

RELATED PARTS

–

1490A TA03

10k

47k

16k

620k

1.6M

33k

10k

100k

R10

620k

0.068

µF

0.047

µF

0.01

µF

R13

130k

R12

10k

R15

47k

R14

10k

R24

420

µF

LOAD

UP TO

TEN

PHONES

R23

4.7k

R26

2N3904

2N3906

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 A DISCUSSION OF THE CIRCUIT

R18

100

Ω

R17

620

Ω

R16

100k

15V

100k

R25

4.7k

0.033

µF

R21

150

Ω

R19

620

Ω

15V

300k

R11

10k

1N4148

0.47

µF

1/4 LT1491A

IRF628

2N3904

60V

1/4 LT1491A

OPTO1*

R20

100k

1/4 LT1491A

PART NUMBER

DESCRIPTION

COMMENTS

LT1366/LT1367

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

475

µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW

LT1636

Single Over-The-Top Micropower Rail-to-Rail Input and Output

µA Supply Current, VCM Extends 44V above VEE,

Op Amp

Independent of VCC, MSOP Package, Shutdown Function

LT1638/LT1639

Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail

0.4V/

µs Slew Rate, 230µA Supply Current per Amplifier

Input and Output Op Amps

LT1782

Micropower, Over-The-Top, SOT-23, Rail-to-Rail

SOT-23, 800

µV VOS(MAX), IS =55µA (Max),

Input and Output Op Amp

Gain-Bandwidth = 200kHz, Shutdown Pin

LT1783

1.2MHz, Over-The-Top, Micropower, Rail-to-Rail

SOT-23, 800

µV VOS(MAX), IS =300µA (Max),

Input and Output Op Amp

Gain-Bandwidth = 1.2MHz, Shutdown Pin

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

TYPICAL APPLICATIO

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