General description
The PTN3392 is a DisplayPort to VGA adapter IC designed to connect a DisplayPort source to a VGA sink. The PTN3392 integrates a DisplayPort receiver and a high-speed triple video digital-to-analog converter that supports display resolutions from VGA to WUXGA (see Table 5). The PTN3392 supports either one or two DisplayPort v1.1a lanes operating at either 2.7 Gbit/s or 1.62 Gbit/s per lane. The PTN3392 has ‘Flash-over-AUX’ capability enabling simple firmware upgradability in the field.
The PTN3392 supports I2C-bus over AUX per DisplayPort v1.1a specification (Ref. 1), and bridges the VESA DDC channel to the DisplayPort Interface.
The PTN3392 is designed for single supply and minimizes application costs. It can be powered directly from the DisplayPort source side 3.3 V supply without a need for additional core voltage regulator. The VGA output is powered down when there is no valid DisplayPort source data being transmitted. The PTN3392 also aids in monitor detection by performing load sensing and reporting sink connection status to the source.

FEATUREs and benefits
VESA-compliant DisplayPort v1.1a converter
■ Main Link: 1-lane and 2-lane modes supported
   ◆ HBR (High Bit Rate) at 2.7 Gbit/s per lane
   ◆ RBR (Reduced Bit Rate) at 1.62 Gbit/s per lane
   ◆ BER (Bit Error Rate) better than 10-9
   ◆ Down-spreading SSC (Spread Spectrum Clocking) supported
■ 1 MHz AUX channel
   ◆ Supports native AUX CH syntax
   ◆ Supports I2C-bus over AUX CH syntax
■ Hot Plug Detect (HPD) signal to the source
■ Cost-effective design optimized for VGA application

DDC channel output
■ Supports 100 kbit/s I2C-bus speed, declared in DPCD register
   ◆ Support of I2C-bus speed control by DisplayPort source via DPCD registers,
      facilitating use of longer VGA cables
■ I2C Over Aux feature facilitates full support of MCCS, DDC-CI, and DDC protocols
   (see Ref. 2)

Analog video output
■ VSIS 1.2 compliance (Ref. 3) for all supported video output modes
■ Analog RGB current-source outputs
■ VSYNC and HSYNC outputs
■ Pixel clock up to 240 MHz
■ Triple 8-bit Digital-to-Analog Converter (DAC)
■ Direct drive of double terminated 75 Ω load with standard 700 mV (peak-to-peak)
   signals (Continue ...)

APPLICATIONs
■ Dongle PC accessory
   ◆ Dongle connected to PC DisplayPort output and connected to RGB monitor via
      VGA cable
   ◆ PTN3392 is powered by the DP_PWR pin on the DisplayPort connector
■ Desktop and notebook computers
■ Notebook docking stations