saa4970t NXP Semiconductors, saa4970t Datasheet - Page 25

• Manufacturer Part Number: saa4970t
• Description: Economical Video Processing Ic Ecobendic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
The ECOBENDIC fits in a concept together with a triple
AD, a field memory and a microcontroller, to form a double
scan converter for YUV data.
The scan mode is AABB only. Proscan and noise
reduction are not intended with the ECOBENDIC
stand-alone. With extra processing of e.g. a Progressive
scan-Zoom and Noise reduction IC (PROZONIC
SAA4990) or Movement Estimation Line-flicker Zoom
Noise reduction IC (MELZONIC SAA4991), other scan
modes and noise reduction become possible.
All clock signals in this concept are produced by the
ECOBENDIC. The video processing is done with a
one-clock system. The read clock is frequency divided
by 2 to obtain the write clock. With the aid of a window in
which the PLL frequency is held, a phase disturbance of a
VCR will not affect the display clock stability within the
display of the active part of the video. For compression
purposes, like 4 : 3 video on a 16 : 9 display, an external
second PLL should be used. On both the acquisition and
display side, external PLLs can be applied, with 3-state
switching of the CLK signals from the ECOBENDIC.
1996 Oct 25
Economical video processing IC
(ECOBENDIC)
25
If the field memory data can be selectively updated, then
multi picture is possible, with or without a PIP signal
blanked in the YUV input data. In the latter case the
ECOBENDIC will present a lower clock frequency to the
ADC and memory write clock. With a PIP signal blanked in
YUV, the ECOBENDIC will just manoeuvre the PIP
position into the right memory location.
The microcontroller gets the (12 MHz) clock and the
watchdog reset signals from the ECOBENDIC.
Preliminary specification
SAA4970T