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If the video does not contain any AC components during the

autozero level (e.g. RGB video), then the above networks

are not needed and the CFA output can be connected

directly to the S/H input.

Power Dissipation

The EL4093 current feedback amplifier has an absolute

maximum of ±30mA output current drive. This is slightly

more than the current required to drive ±2V into 75

Ω. To see

how much the junction temperature is raised in this worst

case, we refer to the equations below:

where:

amplifier in the Package

calculated as follows:

where:

For the EL4093, the maximum supply current is 11.5mA on

swings ±2V into 75

Ω. Since the S/H has a current output, we

assume that it is at maximum current swing (±5.5mA) but at

a mid-rail output voltage (0V). With the above assumptions,

resistance of a narrow SO package (120°C/W), this yields a

temperature increase of 27°C. Since the maximum ambient

temperature is 85°C, the resulting junction temperature of

112°C is still below the maximum.

Please note that this in addition to metal migration problems.

FIGURE 8. LOWPASS FILTER DELAYS INPUT TO SAMPLE AND HOLD

EL4093