5

FN2924.8

Application Information

Layout Considerations

The wide bandwidth of the HA-5033 necessitates that high

frequency circuit layout procedures be followed. Failure to

follow these guidelines can result in marginal performance.

Probably the most crucial of the RF/video layout rules is the

use of a ground plane. A ground plane provides isolation and

minimizes distributed circuit capacitance and inductance

which will degrade high frequency performance. IC sockets

contribute inter-lead capacitance which limits device

bandwidth and should be avoided.

Pin 6 can be tied to either supply, grounded, or simply not used.

But to optimize device performance and improve isolation, it is

recommended that this pin be grounded.

Other considerations are proper power supply bypassing

and keeping the input and output connections as short as

possible which minimizes distributed capacitance and

reduces board space.

Power Supply Decoupling

For optimum device performance, it is recommended that

the positive and negative power supplies be bypassed with

capacitors to ground. Ceramic capacitors ranging in value

from 0.01

µF to 0.1µF will minimize high frequency variations

in supply voltage. Solid tantalum capacitors 1

µF or larger will

optimize low frequency performance.

It is also recommended that the bypass capacitors be

connected close to the HA-5033 (preferably directly to the

supply pins).

Figure 5 is based on:

P

DMAX

T

JMAX

T

A

–

θ

JA

-------------------------------

=

0.6

0.4

0.2

0

25

45

65

85

105

125

TEMPERATURE (°C)

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

FIGURE 5. MAXIMUM POWER DISSIPATION vs

TEMPERATURE

CAN

PDIP

FIGURE 6. VIDEO COAXIAL LINE DRIVER 50

Ω SYSTEM

FIGURE 7. VIDEO GAIN BLOCK

RG -58

50

Ω

-12V

+12V

5

12

10

0.1

µF

0.1

µF

11

50

Ω

75

Ω

VIDEO

75

Ω

OUTPUT

HA-5033

900

Ω

V-

V+

HA-2539

V-

V+

100

Ω

15

Ω

60

Ω

VIDEO

SIGNAL

INPUT

+

-

HA-5033