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DisplayPort transmitter
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The STDP4028 is a DisplayPort transmitter IC for the secure transmission of high-bandwidth, uncompressed digital audio-video signals targeted for applications such as DTV, LCD monitor, docking station, and other types of display systems. STDP4028 is a VESA DP 1.1a and eDP compliant device, implementing a single link DisplayPort output port comprising four main lanes, auxiliary channel and HPD. In addition to the standard HBR (2.7 Gbps) and RBR (1.62 Gbps) speeds, this device supports “turbo” speed of 3.24 Gbps per lane with a total link bandwidth of 12.96 Gbps. The higher bandwidth provides unique benefits to users over other commercial DP transmitters for embedded applications by offering additional margin to support higher color depth, resolution, and refresh rate. For example, STDP4028 supports FHD non-reduced blanking video (1080p 30-bit color per pixel) at 120 Hz, plus 7.1 Ch audio in two-box TV applications. The high-speed auxiliary channel in STDP4028 acts as a bidirectional communication link, supporting application-specific protocols such as MCCS, DDC, UART, IR, as well as, the dedicated DisplayPort link training and device management functions.

The STDP4028 supports RGB and YCC video color formats with color depth of 12 (YCC 4:2:2 only), 10, and 8 bits. This device offers LVDS and LVTTL input interface configurable to map a wide range of display controller products. The Quad LVDS interface supports video signals up to 400 MHz pixel rate with flexible channel and lane swapping options. The 60-bit LVTTL input ports on STDP4028 can be mapped to transfer video data either in two pixels per clock or single pixel per clock of a chosen color depth. The STDP4028 also supports both compressed and uncompressed audio formats. This device comprises four I2S audio inputs, supporting up to 8 channels LPCM audio and a single wire SPDIF input for encoded audio. The STDP4028 features HDCP 1.3 content protection scheme with an embedded key option for secure transmission of digital audio-video content. In addition, it supports the HDCP repeater function and, thus acts as a downstream transmitter suitable for two-box TV and HDMI/DVI to DP converter applications.

The STDP4028 can be configured by an external host through the I2C host interface. This IC also includes general purpose inputs/outputs that can be used for controlling system components. The STDP4028 features a color space converter (RGB to YCC and YCC to RGB) for flexible interface with external video processing devices.

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Data Brief

Key Features

  • Enhanced DisplayPort® (DP) transmitter
  • DP 1.1a compliant
  • Embedded DisplayPort (eDP) compliant
  • 1, 2, or 4 lanes
  • Higher bandwidth “Turbo mode” (3.24 Gbps) per lane, supports:
  • 1920 x 1080 (FHD) 120 Hz/10-bit color video standard timings and 7.1 Ch audio
  • 2560 x 1600 (WQXGA), 2560 x 2048 (QSXGA) 60 Hz/10-bit color graphics and 7.1 Ch audio
  • Interface compatibility with wide range of display controller ICs
  • LVTTL (60 wide) and LVDS (quad bus) video interface
  • 8-Ch I2S and SPDIF audio interface
  • Robust AUX channel
  • Link service, maintenance
  • I2C-over-AUX (MCCS, DDC)
  • IR, full duplex UART protocol
  • Configurable through I2C host interface
  • Supports HDCP 1.3 with on-chip keys
  • HDCP repeater capability
  • Acts as downstream transmitter
  • Spread spectrum on DisplayPort, LVDS, and TTL interfaces for EMI reduction
  • Supports deep color and color format conversion
  • RGB/YCC (4:4:4) – 10-bit color
  • YCC (4:2:2/4:2:0) – 12-bit color
  • RGB (4:4:4) to YCC (4:4:4) conversion and vice-versa
  • Low power operation; 20 mW standby
  • I2C to AUX bridge for EDID, MCCS pass through
  • Supports HBR/“Turbo” speed over HBR/RBR-rated long cables (15 m and more)
  • Package
  • 164 LFBGA (12 x 12 mm / 0.8 mm)
  • Power supply voltages
  • 3.3 V I/O; 1.2 V core

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB0845: DisplayPort transmitter
1.1 103 KB

Presentations & Training Material


Description Version Size
DisplayPort: Next-generation digital A/V interface
1.0 253 KB

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