TB1239BF

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
· 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

Note 6: Put on the circuit board. Refer to the figure below.

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.