LT1251 데이터 시트보기 (PDF) - Linear Technology

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LT1251

40MHz Video Fader and DC Gain Controlled Amplifier

Linear Technology 

TYPICAL APPLICATIONS

AM Modulator with DC Output Nulling Circuit

LT1251/LT1256

1MHz

CARRIER

2.5VDC

INPUT

220k

AUDIO

MODULATION

0.1µF

50Ω

0.1µF

220k

1

2

3

4

5

NULL 6

V– 7

LT1256

+

1

2

–

CONTROL

+

C

IC IFS

FS

–

5k

5k

V+

0.1µF

14

13

12

11

10

9 V+

8

RF2 RF1

1.5k 1.5k

220k

VOUT

LT1077

1251/56 TA03

V–

Single Supply Inverting AC Amplifier

C1

10µF RG1

RF1

+ 1.5k

1.5k

V1

R1

20k

V+

R2 +

20k

2

1

CO

10µF 14

13

LT1251/LT1256

–

1

+

8

+

V+ 9 5V

2

–

V– 7

VOUT

VC RC RFS VFS

3 5 10 12

C2

10µF

RG2

V2

+ 1.5k

CONTROL

2.5VDC

VOLTAGE RF2 INPUT

1.5k

1251/56 TA05

Single Supply Noninverting AC Amplifier

with Digital Gain Control

10µF

RG1

RF1

+ 1.5k

1.5k

10µF

V1

+

10µF

V2

+

10k

20k

5V

20k

LT1251/LT1256

2

–

1

1

+

8

14 +

13 2

10k

–

V+ 9 5V

V– 7

+

10µF

VC RC RFS VFS

3 5 10 12

10µF

+

RG2

RF2

1.5k

1.5k

VOUT

VREF

DIN

VOUT LTC1257 CLK

LOAD

GND VCC

5V

µP

1251/56 TA06

15

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