Luminance, Chroma and Synchronizing Signals Processor IC for PAL/NTSC/SECAM COLOR TV

TB1239BF integrates luminance, chroma and synchronizing signals processing circuits for PAL/NTSC/SECAM color TV system.
TB1239BF incorporates high performance picture quality compensation circuits in luminance section, an automatic PAL/NTSC/SECAM discrimination and decode circuits in chroma section, and an automatic 50/60 Hz discrimination circuit in synchronizing section.
Besides a crystal oscillator generates 4.43 MHz, 3.58 MHz and M/N-PAL clock signals internally for color demodulation. A horizontal PLL circuit is also built in this IC.
PAL/SECAM demodulation circuits which are adjustment-free circuits incorporates a 1 H DL circuit inside for operating the base band signal processing system.
Also, TB1239BF makes it possible to set and to control various functions through the built-in I2C BUS line.

Features
Luminance Section
 • Built-in chroma trap filter
 • Black stretch circuit
 • DC restoration circuit
 • Y delay line
 • Sharpness control
 • Sub-Contrast control (−/+2dB)
 • Black set-up for PAL plus

Chroma Section
 • Built-in 1 H delay circuit (PAL/SECAM base band demodulation system)
 • One crystal color demodulation circuit (4.43 MHz, 3.58 MHz, M/N-PAL)
 • Automatic system discrimination system and forced system mode
 • 1 H delay line also serves as comb filter in NTSC demodulation
 • Built-in band-pass and take-off filter, SECAM bell filter
 • Sub-Color control (−/+2dB)

Synchronizing Section
 • Built-in horizontal VCO resonator
 • Adjustment-free horizontal and vertical oscillation by count-down circuit
 • Automatic vertical frequency discrimination circuit
 • Noise detection circuit

Others
 • Y/C out level control
 • 4-channels inputs switching
 • 2-input circuit for RGB
 • 2-input circuit for Y/Cb/Cr
 • Y/Cb/Cr outputs
 • Cb/Cr offset adjustment
 • Built-in pre filters for A/D converter