Ω

Ω

Ω

Ω)

APPLICATION NOTES CON'T

0

100

80

80

0

35

35

50

1.6

7.8

6.5

5.6

0

6.1

4.9

10

1.6

13.9

11.4

15.6

The video input can be electrically disconnected from the

amplifier by applying a TTL high input to the blank pin. When

when it is in blank mode.

When the TTL compatible blank input is not used, the pin

must be connected to ground to enable the amplifier. The blank

input will float high when left unconnected which will disable

the video.

BLANK INPUT

The MSK 1900 has an on board buffered DC zener reference

temperature test limits of 5.2V to 5.8V DC. This output is

provided for gain and offset adjustment and can source up to

4mA of current.

TOTAL

Watts

Watts

The MSK 1900 package is electrically isolated from the inter-

nal circuitry, allowing direct connection to a heat sink.

The power dissipation of the amplifier depends mainly on

the load requirements, bandwidth, pixel size, black level and the

value of the external Rp. Refer to the following table for typical

power levels for selected video conditions:

THERMAL MANAGEMENT

4

Rev. B 9/99

The voltage developed across the external load resistor with a

0V video input to the MSK 1900 is the black level. This voltage

may be changed by adjusting the load resistor or by varying the

trol voltage if the video input has a DC component. AC coupling

of the video input will prevent this phenomenon from occurring.

BLACK LEVEL

output quiescent current and consequently the DC output volt-

age (black level). Output quiescent current adjustment range is

from several µA to 100mA nominal (80 to 130 mA actual).

GND to this input, but any 0 - 5.5V external DC source may be

used. A 0.1µF capacitor should be connected from this pin to

signal ground to improve the amplifier's stability.

POWER DISSIPATION TABLE

Duty

Cycle %