LT1720 datasheet(7/28 Pages) LINER

Part #	LT1720

Description	UltraFast:4.5ns at 20mV Overdrive 7ns at 5mV Overdrive

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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7 / 28 page

LT1720/LT1721

7

17201fc

TEST CIRCUITS

+

–

+

DUT

1/2 LT1720 OR

1/4 LT1721

15VP-P

BANDWIDTH-LIMITED

TRIANGLE WAVE

~1kHz

LTC203

1/2 LT1112

50Ω

100k

2.4k

10nF

1μF

0.15μF

1/2 LT1638

100k

200k

10k

1000

VHYST

1000

VTRIP

+

1000

VTRIP

–

1000

VOS

0.1μF

50Ω

50k

VCM

VCC

+

–

1/2 LT1112

17201 TC01

10nF

1μF

NOTES: LT1638, LT1112, LTC203s ARE POWERED FROM 15V.

200kW PULL-DOWN PROTECTS LTC203 LOGIC INPUTS

WHEN DUT IS NOT POWERED

15

3

2

14

16

9

1

8

10

6

7

11

LTC203

2

14

15

3

1

8

16

9

7

11

10

6

±VTRIP Test Circuit

Response Time Test Circuit

–

+

–3V

–100mV

–5V

PULSE

IN

0V

50Ω

1N5711

400Ω

130Ω

25Ω

50Ω

+VCC – VCM

–VCM

50k

DUT

1/2 LT1720 OR

1/4 LT1721

25Ω

0.1μF

17201 TC02

10

SCOPE PROBE

(CIN ≈ 10pF)

0.01μF

750Ω

2N3866

V1*

*V1 = –1000 • (OVERDRIVE

VTRIP

+)

NOTE: RISING EDGE TEST SHOWN.

FOR FALLING EDGE, REVERSE LT1720 INPUTS

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LT1720 Datasheet(PDF) 7 Page - Linear Technology

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