LF3370

Features:

· 83 MHz Data Rate for HDTV Applications
· Supports Multiple Video Formats Bi-Directional Conversions:
    - 4:2:2:4
    - 4:4:4:4
    - R/G/B/Key
    - Y/U/V/Key
· Multiplexed and Non-multiplexed I/O Data
· User-Programmable:
    - 3 x 3 Colorspace Converter
    - LUT for Gamma Correction
    - I/O Bias Compensation
    - Bypass Capability
· 13-bit Data Path, Colorspace
    Converter Coefficients and Key
    Channel Scaling Coefficients
 · 160-lead PQFP


Pinout




Specifications

Storage temperature ........................................................65to +150
Operating ambient temperature ............................................. 0 to +70
VCC supply voltage with respect to ground ...........................0.5 V to +4.5 V
Input signal with respect to ground ..........................................0.5 V to 5.5 V
Signal applied to high impedance output ..................................0.5 V to 5.5 V
Output current into low outputs ..............................................................25 mA
Latchup current ..................................................................................> 400 mA

Description

The LF3370 is a video format converter capable of operating at HDTV data rates. This device converts to and from any of the various SDTV/HDTV digital video formats by utilizing an internal 3 x 3 Matrix Multiplier and two 1:2 Interpolation/2:1 Decimation Half-Band Filters.

Using the Input Demultiplexer and Output Multiplexer, the LF3370 can accept and output interleaved or non-interleaved video. For example, R/G/B/Key data can be color space converted to Y/U/V/Key and down-converted to 4:2:2:4. By re-arranging the order of the functional sections, the opposite conversion can be achieved. The coefficients for the 3 x 3 Matrix Multiplier are fully user programmable to support a wide range of color space conversions. The two Interpolation/ Decimation Half-Band Filters are fully compliant with SMPTE 260M.

Input and Output Bias Adders are included for removing or adding a user-defined bias into the video signal. In addition, three programmable 1K x 13-bit Look-Up Tables (LUTs) have also been included for various uses such as gamma correction. A Scaler has been included on the Key Channel for scaling to a desired magnitude
using user programmable coefficients.

Input signals can also be forced to user-defined levels for horizontal blanking. Furthermore, Round/ Select/Limit (RSL) circuitry is provided at the end of various stages to provide the best possible conversions without color violations.
For additional flexibility, the Halfband Filter can be individually bypassed using an internal programmable length delay.
All control and coefficient registers are loaded through the LF Interface ™.

This LF3370 operates at 3.3 V (5 V tolerant I/O) and is available in 160-lead PQFP package.