company blog about Chrontel CH7517A Low-Power DisplayPort To VGA Converter

Chrontel CH7517A Low-Power DisplayPort To VGA Converter

Product Description Of CH7517A
CH7517A is a low-cost, low-power semiconductor device that translates the DisplayPort signal to the VGA. This innovative DisplayPort receiver with an integrated VGA encoder is specially designed to target the notebook/ultrabook, tablet device and PC market segments. Through the CH7517A's advanced decoding/encoding algorithm, the input DisplayPort high-speed serialized multimedia data can be seamlessly converted to analog RGB video output.

CH7517A is compliant with the DisplayPort specification version 1.2 and the Embedded DisplayPort Specification version 1.3. In the device's receiver block, which supports two DisplayPort Main Link Lanes input with data rate running at either 1.62Gb/s or 2.7Gb/s, can accept RGB digital formats in either 18-bit 6:6:6 or 24-bit 8:8:8, and converted the input signal to VGA output up to 1920x1200@60Hz or 2048x1152@60Hz with reduced blanking. Leveraging the DisplayPort's unique source/sink “Link Training” routine, the CH7517A is capable of instantly bring up the video display to the VGA monitor when the initialization process is completed between CH7517A and the graphic chip.

The DACs are based on current source architecture. And the VGA output meet VESA VSIS v1r2 clock jitter target. With sophisticated MCU and the on-chip Flash, CH7517A support auto-boot and EDID buffer. After the configuration by firmware, which is auto loaded from the Flash embedded, CH7517A supports DisplayPort input detection, DAC connection detection and determine to enter into Power saving mode automatically.

Features Of CH7517A
Compliant with DisplayPort specification version 1.2 and Embedded DisplayPort (eDP) specification version 1.3.
Support 2 Main Link Lanes at either 1.62Gb/s or 2.7Gb/s link rate
VGA output is compliant with VESA VSIS v1r2 specification
Embedded MCU to handle the control logic
Support device boot up by automatically loading firmware from on-chip flash Boot ROM
Integrated EDID Buffer, and MCCS bypass supported
Supports Enhanced Framing Mode
Fast and full Link Training for embedded DisplayPort system
Support eDP Authentication: Alternative Scramble Seed Reset and Alternative Framing
2 work modes: connect 27MHz crystal, inject 27MHz clock
DAC connection detection supported
DP input detection supported
Support Auto Power Saving mode and low stand-by current
Support Spread Spectrum Clocking (de-spreading) for EMI reduction
DP AUX channel and IIC slave interface are available for firmware update and debug
Low power architecture
3.3V/1.05V power supply supported for motherboard solution design
RoHS compliant and Halogen free package
Offered in 40-Pin QFN package (5 x 5 mm)

Applications Of CH7517A
Notebook/Ultrabook
Tablet Device
Handheld/Portable Device
PC

CH7517A Functional Block Diagram