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SAA4995WP

PANorama-IC (PAN-IC)

Philips Electronics 

Philips Semiconductors

PANorama-IC (PAN-IC)

Preliminary specification

SAA4995WP

handbook, full pagewidth

WEI 7

TEST 8

SCANIN 9

VDD1 10

T0 11

GND1 12

T1 13

WEod 14

VDD2 15

GND2 16

WEO 17

SAA4995WP

39 YI5

38 YI6

37 YI7

36 VRST

35 SNCL

34 SDNA

33 VDD3

32 GND4

31 CLK

30 GND3

29 YO7

MGK175

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The PAN-IC is an add-on IC to be used, for example,

between analog-to-digital conversion and a serial (field)

memory. The device performs the following tasks:

• Linear horizontal sample rate conversion in both zoom

and compress direction, with a sample rate conversion

factor between 0.5 and 2

• Dynamic sample rate conversion for panorama mode

display of e.g. 4 : 3 material on a 16 : 9 display

• Dynamic sample rate conversion for amaronap mode

display of e.g. 16 : 9 material on a 4 : 3 display.

The PAN-IC has the ability to increase the data rate from

the ADC (maximum 16 MHz in a 16/32 MHz concept) to a

maximum of twice the data rate. For this, a 32 MHz clock

rate is needed to write to the memory. All actions to

generate a lower data rate produces disable cycles in write

enable.

In panorama and amaronap modes, the sample rate

conversion factor is modulated along the video line.

In the centre of the line a high quality compression (e.g.

with a factor 4⁄3) has to be made. Towards the sides of the

line, more and more expansion and compression

respectively is made. The sample rate conversion factor

over a line will have a bathtub shape, with parameters

illustrated in Fig.3:

• X0l and X0r, where in-between a constant data rate is

maintained (area I) and starting points from where a

curve can be programmed for its 2nd derivative (in

areas II and V)

• X1l and X1r, points from where a new curve can be

programmed for its 2nd derivative (for areas III and IV)

• X2l corresponds to the first sample in the output data

stream, defined by start of WEI

• X2r corresponds to the last sample in the output data

stream, defined by the programmed number of samples

• C1, which controls the second derivatives of the data

rate in areas II and V

• C2, which controls the second derivatives of the data

rate in areas III and IV.

1997 Jun 10

5

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