CH7034

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Features

  • Supports multiple output display formats – including Component YPrPb(HDTV), LVDS and analog RGB (VGA)

  • Three 10-bit high speed DACs

  • HDTV output support up to 1080p

  • Analog RGB (VGA) support up to 1920x1080 resolution

  • Single channel LVDS 18-bit transmitter supports input resolution up to 1366x768

  • Support scaled and bypassed video streams output from VGA/HDTV and LVDS interfaces simultaneously

  • Supports panel protection, power sequencing and backlight on/off. PWM is available for controlling LCD brightness

  • TV/Monitor connection detect capability. DACs can be switched off through programming internal registers

  • On-chip SDRAM frame buffer to support frame rate conversion.

  • Programmable adaptive de-flickering filter

  • Supports 8/12/16/18/24-bit parallel interface inputs for either RGB format or YCbCr format (ITU-R 656 or ITU-R 601). 80/86 MPU interfaceand DE only mode are also supported.

  • Wide range of input resolutions support for up to 1366x768 (i. e. 640x480 720x480, 720x576, 800x600, 1024x600, 1024x768, 1280x800, and etc.)

  • Image display rotation support at 90/180/270 degree or flipped in horizontal/vertical position

  • Pixel-level color enhancement for brightness, contrast, hue and saturation adjustment for HDTV

  • Horizontal/vertical position adjusted through serial port programming

  • Pixel clock input frequency support for up to 165 MHz

  • Flexible crystal or oscillator clock input frequency (2.3MHz – 64MHz)

  • IO Supply Voltages from 1.2V to 3.3V and SPC/SPD Supply Voltages from 1.8V to 3.3V.

  • Programmable power management

  • Device fully programmable through serial port or can automatically load firmware from Chrontel Boot ROM (CH9904)

  • Offered in a 88-pin QFN package

Describe

Chrontel CH7034B is specifically designed for a portable system that requires connections to LCD display, High Definition Television (HDTV) or RGB (VGA) monitor. With its advanced video encoder, flexible scaling engine and easy-to-configure video interface, the CH7034B satisfies manufactures’ product display requirements and reduce their costs of development and time-to-market.

The CH7034B provides analog RGB and YPrPb outputs that allow a system to display high definition media content to HDTV/RGB monitors. The device is compliant with EIA770-3 and SMPTE 274M/293M/296M standards and supports HDTV resolution up to 1080p. The 3 high-performance, 10-bit DACs can be used for either HDTV display or VGA output. The CH7034B has the ability to generate composite syncs if required by the RGB monitor.

To support portable computer with LCD display, the CH7034B has incorporated an one-channel, 18-bit output LVDS transmitter. On-chip dithering function is available to convert 24-bit color to 18-bit color LCD panels. Two popular LVDS standards, the OpenLDI and the VESA SPWG are supported by the CH7034B LVDS driver. The preferred standard and its display timing can be configured through devices’ registers when system is powered on.

The CH7034B is equipped with panel protection mechanism to switch off the LCD instantly if input data is missing or unstable. The panel on/off sequences and backlight control can be configured through programming internal registers. In addition, a built-in PWM function can be used to achieve digital dimming for LCD panel.

The CH7034B converts a wide range of input formats to HDTV/VGA outputs and LVDS display. RGB data format such as 16-bit 5:6:5, 18-bit 6:6:6 or 24-bit 8:8:8 enters through the device’s 24-bit bus. In YCrCb format, either 24-bit 4:4:4 data or 16-bit 4:2:2 is supported by the CH7034B’s color space converter. The device’s video capture block also has an option to support 80/86 MPU interface. The input video signal can be either interlaced or non-interlaced data formats.

With its embedded high speed SDRAM, the CH7034B can help manufactures design their products to achieve simultaneous LVDS and HDTV/VGA display. Thanks to the sophisticated scaler, the input LCD data with low resolution or reduced-frame rate can be covert to high quality HDTV or VGA display without extra loading on the processor. Also, by taking the advantage of the framebuffer, the scaler can perform other image manipulations including resizing and rotation.

Structure diagram

Application Desc

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Technical Report

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Specifications

Input Interface  TTL/Digital RGB, TTL/YCbCr, TTL/BT1120

Output Interface  LVDS, VGA

Audio Interface   No

Other features  Scaler, Frame Buffer

Package Type   QFN88

OrderInfo

Part Number  Package Type  Number of Pins Operating Temperature Range

CH7034B-BF  Lead Free - QFN88Commercial : -20 to 70°C

CH7034B-BFI  Lead Free - QFN88Industrial : -40 to 85°C

Video

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About Chrontel Overview Chrontel, headquartered in San Jose, California, is a privately-held company with over 130 employees worldwide. Incorporated in 1986, the company develops and markets mixed-signal integrated circuits for the PC, display and consumer mark...

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