FMS6364AMTC14X datasheet(10/13 Pages) ONSEMI

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FMS6364A • Rev. 3.0.5

The same method can be used for biased signals. The

Pb and Pr channels are biased to set the DC level to

500 mV.

The same circuits can be used with AC-coupled outputs

if desired.

Figure 17. AC-Coupled Inputs and Outputs

Figure 18. Biased SCART with AC-Coupled Outputs

Note:

The video tilt or line time distortion is dominated by

the AC-coupling capacitor. The value may need to

be increased beyond 220

μF to obtain satisfactory

operation in some applications.

Power Dissipation

The FMS6364A output drive configuration must be

considered when calculating overall power dissipation.

Care must be taken not to exceed the maximum die

junction temperature. The following equations can be

used to calculate the power dissipation and internal

temperature rise.

TJ = TA + PD • ϴJA

(1)

where:

PD = PCH1 + PCH2 + PCH3 and

(2)

PCHx = VCC • ICH - (VO

2/R

(3)

where:

VO = 2 VIN + 0.280 V

(4)

ICH = (ICC/3) + (VO/RL)

(5)

VIN = RMS value of input signal

ICC = 50 mA

VCC = 3.3 V

RL = channel load resistance.

Board layout can also affect thermal characteristics.

Refer to the Layout Considerations section for details.

The FMS6364A is specified to operate with output

currents typically less than 50 mA, more than sufficient

for a dual (75

Ω) video load. Internal amplifiers are

current limited to a maximum of 100 mA and should

withstand brief-duration short-circuit conditions. This

capability is not guaranteed.

DVD or

STB

SoC

DAC

Output

LCVF

Clamp

Active

0.1μ

0V - 1.4V

75Ω

220μ

LCVF

Clamp

Active

0.1μ

External video

source must

be AC coupled

0V - 1.4V

220μ

75Ω

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