Two-Lane Displayport to VGA Adapter IC

Overview

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. 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, 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.

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Features

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

Analog video output

VSIS 1.2 compliance 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

General features

Supports ‘Flash-over-AUX’ field upgradability
Monitor presence detection. Connection/disconnection reported via HPD IRQ and DPCD update
All display resolutions from VGA to WUXGA are supported1, including e.g.:
- WUXGA: 6 bits, 1920 × 1200, 60 Hz, 193 MHz pixel clock rate
- WUXGA: 1920 × 1200, 60 Hz, reduced blanking, 154 MHz pixel clock rate
- UXGA: 1600 × 1200, 60 Hz, 162 MHz pixel clock rate
- SXGA: 1280 × 1024, 60 Hz, 108 MHz pixel clock rate
- XGA: 1024 × 768, 60 Hz, 65 MHz pixel clock rate
- SVGA: 800 × 600, 60 Hz, 40 MHz pixel clock rate
- VGA: 640 × 480, 60 Hz, 25 MHz pixel clock rate
- Any resolution and refresh rates are supported up to 8 bit color
Bits per color (bpc) supported
- 6, 8 bits supported
- 10, 12, 16 bits supported by truncation to 8 MSBs
All VGA colorimetry formats (RGB) supported
Power modes
- Active-mode power consumption:
  - ~600 mW at UXGA / 162 MHz pixel clock
  - ~500 mW at SXGA / 108 MHz pixel clock
- ~40 mW at Low-power mode or before link training started
On-board crystal oscillator for use with external 27 MHz crystal
ESD protection
- 7 kV ESD HBM JEDEC
- 8 kV ESD HBM IEC 61000-4-2
3.3 V ± 10 % power supply
Commercial temperature range: 0 ℃ to 85 ℃
48-pin HVQFN, 7 mm × 7 mm × 0.85 mm (nominal); 0.5 mm pitch; lead-free package

Target 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