Frequently asked questions

• How does the PTN3700 achieve low electromagnetic emission?
• How small is the PTN3700 package?
• What is frame mixing? Where can frame mixing be useful?

Q

How does the PTN3700 achieve low electromagnetic emission?

A

The PTN3700 uses 1, 2, or 3 pairs of differential subLVDS high-speed serial lanes, along with a differential pair for clock. The low voltage differential swing of 150mV is meant to reduce electromagnetic emission. The combination of low voltage swing, differential signaling, and low intra-pair skew ensures that the already small electromagnetic emissions are effectively canceling themselves out. Furthermore, the slew rate-controlled parallel CMOS output circuitry of PTN3700 (when used in receiver mode) is yet another feature of PTN3700 to ensure low electromagnetic emission.

Q	How small is the PTN3700 package?
A	The PTN3700 is offered in a tiny VFBGA package of 4 x 4.5mm, with a maximum height of 1mm and ball pitch of 0.5mm. When used as a receiver, the PTN3700 is also offered as an even smaller gold-bumped bare die, which can be mounted on glass of the display unit.

Q

What is frame mixing? Where can frame mixing be useful?

A

The PTN3700 receiver implements frame mixing, which is a proprietary pixel-mapping algorithm that features the ability to render full 24-bit color resolution using a cheaper 18-bit display. Provided that the input serial data to the PTN3700 receiver contains 24-bit RGB data, the frame-mixing mode of PTN3700 converts 24-bit RGB input to 18-bit output to the display by modulating the LSB (Least Significant Bits) to give the viewer the visual effect of a 24-bit display. The frame-mixing algorithm is especially effective for still pictures with subtle color gradations. It is worthwhile to note that the algorithm does not degrade the viewer's perception of moving pictures.

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