The Industry's Smallest High Definition Video Driver IC

September 2008 – ROHM formally introduces an ultra-compact, high definition 3-output video driver IC that eliminates the need for an output capacitor. Optimized for portable devices, the BH7606GU integrates 3 video drivers (broadband frequency D4) for Y, PB, and PR output with a transmission frequency up to 30MHz – in sharp contrast to conventional single-output video drivers with a transmission frequency of only 6.75MHz (broadband frequency D1). Novel technology was utilized to integrate a charge pump circuit into a size only slightly larger than the chip itself (2.26×2.26×1.0mm) – a significant feat considering the negative power supply required – eliminating the need for an output capacitor. Additional features include 0µA standby current and a low pass filter for high band noise suppression.

• Main features of the BH7606GU

1. Ultra-compact WL-CSP (Wafer Level Chip Scale Package): 2.26mm×2.26mm×1.0mm
2. Compatible with D4 broadband image signals
3. Built-in 3-output (Y/PB/PR) video driver
4. Integrated charge pump circuit eliminates the need for a large capacitance (220µF – 1000µF) output capacitor
5. Equipped with an LPF and standby function
6. Operating voltage range: 2.85 – 3.45V

New Product Bulletin for Video Driver IC "BH7606GU"(PDF:749KB)

• Glossary

• D Terminal
  A terminal used in Japan for the transmission of analog image signals. Conventionally, it has been necessary to use 3 cables to transmit the three component image signals Y, PB, and PR. The D Terminal combines these three terminals into a signal line. Also, in addition to component image signals, it is also possible to transmit identification signals for the number of scanning lines, the scanning method, and the aspect ratio. Although the terminal standards differ based on each image signal format (the higher the value, the higher the resolution), the shapes of the terminals remain the same.

・D1 Terminal:480i(525i), 720×480 dots, interlaced
        The same image quality as in analog television broadcasts, VHS/S-VHS tapes, and standard DVD video.
・D3 Terminal:1080i(1125i), 1920×1080 dots, interlaced
        This is the standard used in most high-definition broadcasts.
・D4 Terminal:720p (750p), 1280×720 dots, progressive
        Compatible with D3 signals. 720p transmission at this time is not performed, although the majority of
        high-definition TVs are compatible with D4.
Note: The numbers denote the number of effective scanning lines (total number of scanning lines).


• High Definition
  This is used to signify HDTV in Japan. NHK holds the trademark rights.
  HDTV features approximately twice the number of scanning lines as conventional standard broadcasts (i.e. NTSC, PAL, SECAM). The protocol, defined by the International Telecommunication Union in the ISO standards (2000), stipulates 1125 scanning lines (1080 effective scanning lines, with an image aspect ratio of 16:9).
• SD (Standard Definition)
  This refers to standard TV signals (480i).
• Charge Pump Circuit
  This circuit generates negative voltage within the IC from a positive voltage power source, and is used to operate IC circuits requiring both negative and positive power. This negative/positive power operation eliminates the need for an output capacitor.

• LPF (Low Pass Filter)
  An LPF is used to eliminate unwanted noise components that may remain in the output of the DAC (DA Converter – converts digital image data to analog signals for output to TVs and other displays).