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PTN3355

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Product data sheet

Rev. 3.1 — 4 November 2016

16 of 37

NXP Semiconductors

PTN3355

Low power DP to VGA adapter with integrated 1 : 2 VGA switch

10.2 Power supply filter

Sufficient decoupling capacitance to ground should be connected from each VDD pin

directly to ground to filter supply noise.

10.3 DAC terminations

Typically, the VGA RGB outputs are (doubly) terminated. Figure 6 shows an example

VGA application. A 75

 termination is used to terminate inside the motherboard, and

another 75

 termination is typically used inside the RGB monitor. The load sensing

mechanism assumes this double termination. Figure 7 is another example of VGA

application with 50

 PCB trace impedance with 150  terminations.

In general, it is left to the system integrator to decide on their specific implementation.

Fig 6.

PTN3355 DAC termination example 1

Fig 7.

PTN3355 DAC termination example 2

002aah582

DAC

RED, GRN, BLU

GND

MOTHERBOARD

PCB

EMI

filter

75 Ω

cable

MONITOR

75 Ω

37.5 Ω

PCB traces

75 Ω

PCB traces

close to

VGA connector

aaa-010215

DAC

RED, GRN, BLU

GND

MOTHERBOARD

PCB

EMI

filter

150 Ω

75 Ω

cable

MONITOR

75 Ω

37.5 Ω

PCB traces

50 Ω

PCB traces

150 Ω

75 Ω

PCB traces

close to

PTN3355

close to

VGA connector

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