Daewoo DTL- 25G6F Service Manual download pdf (Page 15)

TDA8844N2 (I

C-bus controlled PAL/NTSC/SECAM TV Processors)

(1) General Description

The TDA8844N2 is I2C-bus controlled single chip TV processors which are intended to be applied in PAL/NTSC

television receiver.

The IC is mounted in a S-DIP 56 envelope.

(2) Feature

•

Video

- Integrated luminance delay line

- Integrated chroma trap and bandpass filters (auto calibrated)

- Asymmetrical peaking circuit in the luminance channel

- Black stretching of non standard CVBS or luminance signals

•

RGB

- RGB control circuit with “Continuous Cathode Calibralion” and white point adjustment.

•

Input / Output

- Flexible source selection with CVBS switch and Y(CUBS)/C input so that a comb filter can be applied.

- The output signal of the video source select is externally available ( also as CVBS when Y/C input is used).

- External audio input.

- Linear RGB input with fast blanking.

•

Synchronization and Deflection

- Horizontal synchronization with two control loops and alignment free horizontal oscillator.

- Slow start and slow stop of the horizontal drive output to enable low stress start-up and switch-off from the line circuit

at nominal line supply voltage.

- Vertical count-down circuit for stable behavior with provisions for non-standard signals.

- Vertical geometry control.

- Vertical drive optimized for DC coupled vertical output stages.

•

Control

- Full I2C bus control, as well for customer controls as for factory alignment.

- All automatic controls have an option for forced mode.

•

Packaging

- SDIP-56(Soldering Dual in-line Packages)

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Daewoo DTL- 25G6F Service Manual Page 15