AD818AN データシートの表示（PDF） - Analog Devices

部品番号

コンポーネント説明

メーカー

AD818AN

Low Cost, Low Power Video Op Amp

Analog Devices 

AD818

ERROR

SIGNAL

OUTPUT

ERROR AMPLIFIER

VERROR OUTPUT ؋ 10

2؋

HP2835

AD829

2؋

HP2835

100⍀

0.47␮F

1M⍀

15pF

SHORT, DIRECT CONNECTION

TO TEKTRONIX TYPE 11402

OSCILLOSCOPE PREAMP

INPUT SECTION

0 TO ؎10V

POWER

SUPPLY

TTL LEVEL

SIGNAL

GENERATOR

50Hz

OUTPUT

DIGITAL

GROUND

ANALOG

GROUND

EI&S

DL1A05GM

MERCURY

RELAY

7, 8

1, 14

50⍀

COAX

CABLE

NULL

ADJUST

FALSE

SUMMING

NODE 1k⍀

1k⍀ 100⍀

500⍀

500⍀

50⍀

5pF–18pF

AD818

2.2␮F 0.01␮F

2.2␮F

–VS

+VS

0.01␮F

0.47␮F

1.9k⍀

–VS

+VS

0.01␮F

100⍀

NOTE

USE CIRCUIT BOARD

WITH GROUND PLANE

DEVICE

UNDER

TEST

0.01␮F

10pF

SCOPE PROBE

CAPACITANCE

TEKTRONIX P6201

FET PROBE TO

TEKTRONIX TYPE 11402

OSCILLOSCOPE

PREAMP INPUT SECTION

Figure 7. Settling Time Test Circuit

AD818 SETTLING TIME

Settling time primarily comprises two regions. The first is the slew

time in which the amplifier is overdriven, where the output voltage

rate of change is at its maximum. The second is the linear time

period required for the amplifier to settle to within a specified

percentage of the final value.

Measuring the rapid settling time of the AD818 (45 ns to 0.1%

and 80 ns to 0.01%—10 V step) requires applying an input pulse

with a very fast edge and an extremely flat top. With the AD818

configured in a gain of –1, a clamped false summing junction

responds when the output error is within the sum of two diode

voltages (approximately 1 V). The signal is then amplified 20 times

by a clamped amplifier whose output is connected directly to a

sampling oscilloscope.

A High Performance Video Line Driver

The buffer circuit shown in Figure 8 will drive a back-terminated

75 W video line to standard video levels (1 V p-p) with 0.1 dB

gain flatness to 55 MHz with only 0.05∞ and 0.01% differential

phase and gain at the 3.58 MHz NTSC subcarrier frequency.

This level of performance, which meets the requirements for

high definition video displays and test equipment, is achieved

using only 7 mA quiescent current.

VIN

RT

75⍀

+15V

0.01␮F

AD818

1k⍀

0.01␮F

–15V

1k⍀

2.2␮F

RBT

75⍀

75⍀

2.2␮F

RT

75⍀

Figure 8. Video Line Driver

–12–

REV. C

Share Link: