LT1251 데이터 시트보기 (PDF) - Linear Technology

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LT1251

40MHz Video Fader and DC Gain Controlled Amplifier

Linear Technology 

LT1251/LT1256

TYPICAL APPLICATIONS

State Variable Filter with Adjustable Frequency and Q

1k

VIN

1k

–

LT1252

+

500Ω

1k

HPOUT

1k

500pF

1.5k

2

LT1256

–

1

1

+

8

14 +

13 2

–

VC RC RFS VFS

1.5k 3 5 10 12

Vω

VFS

1k

500pF

1.5k

LT1256

2

11

8

14

2 13

VFS RFS RC VC

12 10 5 3

VFS

VQ

1.5k

BPOUT

500pF

1k

1.5k

LT1256

2–

1

1

+

8

14

+

13 2

–

VC RC RFS VFS

3 5 10 12

1.5k

1.5k Vω

VFS

LPOUT

500pF

1k

1251/56 TA15a

VFS = 2.5V

Center Frequency vs Control Voltage Vω

350

VFS = 2.5V

300

250

200

150

100

50

0

0

0.5

1.0

1.5

2.0

2.5

Vω (V)

1251/56 TA15b

Q vs Control Voltage VQ

6

VFS = 2.5V

5

4

3

2

1

0

0

0.5

1.0

1.5

2.0

2.5

VQ (V)

1251/56 TA15c

19

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