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