The DDP 3315C is a mixed-signal single-chip digital display and deflection processor, designed for high-quality backend applications in double scan and HDTV TV sets with 4:3 or 16:9 picture tubes. The interfaces qualify the IC to be combined with state of the art digital scan rate converters, as well as analog HDTV sources. The DDP 3315C contains the entire digital video component, deflection processing, and all analog interfaces to display the picture on a CRT.

System Architecture

Luma and chroma are processed separately. The luminance contrast ratio can be extended with a dynamic black level expander. The frequency characteristic is improved by a transient improvement (LTI) and an adaptive dynamic peaking circuit. The chroma signal is enhanced by transient improvement (CTI) to avoid wrong colors.

Digital white-drive control adjusts the white balance and limits the beam current. A non-linear color space enhancer (NCE) for RGB allows any amplitude characteristic. A scan velocity modulation (SVM) signal is calculated via a differentiated luma signal.

East/west parabola can be adjusted even for real flat CRTs. Picture content depending EHT distortions are compensated.

Two fastblank (FBL) controlled analog video signals can be inserted into main RGB.

Block diagram of the DDP 3315C

Video Processing

Linear horizontal scaling (0.25…4), as well as nonlinear horizontal scaling “Panoramavision”

Dynamic black level expander

Luma sharpness enhancement by dynamic peaking and luma transient improvement (LTI)

Color transient improvement (CTI)Programmable RGB matrix

Black stretch, blue stretch, gamma correction via programmable Non-linear Colorspace Enhancer (NCE) on RGB

Two analog double scan inputs with fast blank (one RGB and one RGB/YCrCb/YPrPb )

Histogram calculation

Deflection Processing

Scan velocity modulation output

Digital EHT compensation for vertical / east-west

Soft start/stop of horizontal-drive

Vertical angle and bow correction

Differential vertical outputs

Vertical zoom via deflection adjustment

Horizontal and vertical protection circuit

Horizontal frequency for VGA/SVGA/1080i

Black switch off procedure

Supports horizontal and vertical dynamic focus

Miscellaneous

Selectable ITU-R 601 4:1:1 / 4:2:2 VCrCb input at 27/32 Mhz or double scan ITU-R 656 input at 54 Mhz linelocked clock

Crystal oscillator for horizontal safety

Picture frame generator

Hardware for simple 50/60 Hz to 100/120 Hz conversion (display frequency doubling)

PQFP80 package, 5 V analog and 3.3 V digital supply