ISL59420

9

FN7459.2

July 3, 2012

AC Test Circuits

FIGURE 25A. TEST CIRCUIT FOR MEASURING WITH A 50

Ω OR 75Ω

INPUT TERMINATED EQUIPMENT

FIGURE 25B. BACKLOADED TEST CIRCUIT FOR VIDEO CABLE

LESS THAN 500

Ω WILL BE DEGRADED.

NOTE: Figure 25A illustrates the optimum output load when connecting to input terminated equipment. Figure 26B illustrates backloaded test circuit for

video cable applications.

ISL59420

TEST

50

Ω

or

75

Ω

50

Ω

or

75

Ω

50

Ω

or

75

Ω

475

Ω

or

462.5

Ω

EQUIPMENT

ISL59420

50

Ω or 75Ω

TEST

50

Ω

or

75

Ω

50

Ω

or

75

Ω

EQUIPMENT

Application Circuits

FIGURE 26A. GAIN OF 1 APPLICATION CIRCUIT

FIGURE 26B. GAIN OF 2 APPLICATION CIRCUIT

50

Ω

200

Ω

-

+

0.6pF

PC BOARD

CAPACITANCE

3.9pF

1.6pF

50

Ω

453

Ω

-

+

453

Ω

0.6pF

PC BOARD

CAPACITANCE

3.9pF

1.6pF