Philips SAA4995W Service Manual

INTEGRATED CIRCUITS

DATA SH EET

SAA4995WP

PANorama-IC (PAN-IC)

Preliminary speciﬁcation File under Integrated Circuits, IC02

1997 Jun 10

Philips Semiconductors Preliminary speciﬁcation

PANorama-IC (PAN-IC) SAA4995WP

FEATURES

• Horizontal sample rate conversion in both zoom and compress direction, with a sample rate conversion factor between 0.5 and 2 (in 384 steps)

• Dynamic sample rate conversion for panorama mode display 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

• Operates with 1fh and 2f

h

• Programmable via microcontroller SNERT (Synchronous No parity Eight bit Receive Transmit) bus.

GENERAL 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 to a maximum of twice the data rate at the output. To achieve this a clock rate at twice the normal output clock rate is needed to write data to the memory. All actions to generate a lower data rate, produces disable cycles in Write Enable (WE).

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V I

DD

f

CLK

T

DD

amb

supply voltage 4.5 5 5.5 V supply current − 110 − mA operating clock frequency −−33 MHz operating ambient temperature 0 − 70 °C

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

SAA4995WP PLCC44 plastic leaded chip carrier; 44 leads SOT187-2

1997 Jun 10 2

Philips Semiconductors Preliminary speciﬁcation

PANorama-IC (PAN-IC) SAA4995WP

BLOCK DIAGRAM

handbook, full pagewidth

Y

I7

to

Y

I0

UI1/U

and

VI1/V

WE

I

SNDA

SNCL VRST

I0

CL16

37 to 44

1 to 4

7

CL16 CLK

34 35 36

CLK

5 31

CL16

C C

'0'

1 2

SECAM NOTCH

CLK

V

DD1

10 12

MUX

notch

GND1

V

CLK

SAA4995WP

INTEGRATORMUX

X0rX0IX1rX1IX2rX

SNERT BUS INTERFACE

GND2

DD2

15 16

FRONT-END

INTEGRATOR

LINE CONTROL

2I

in-phase

V

VPD

out-phase

DD3

33 30

SPL

init

GND3

BACK-END

+

C

0

notch

V

DD4

VPD

8 9

GND4

6 32

∆Y∆UV

DTO

C0 C1 C2

29 to 22

21 to 18

Y

O7 to

Y

O0

VO0/V

O1

and

UO0/U

O1

17

WE

O

14

WE

od

13

T1

11

T0

Fig.1 Block diagram.

1997 Jun 10 3

TEST

SCANIN

MGK176

Philips Semiconductors Preliminary speciﬁcation

PANorama-IC (PAN-IC) SAA4995WP

PINNING

SYMBOL PIN DESCRIPTION

U

I1

U

I0

V

I1

V

I0

1 U input bit 1 2 U input bit 0 3 V input bit 1

4 V input bit 0 CL16 5 half system clock V

DD4

WE

I

6 supply voltage 4

7 write enable input TEST 8 test mode switch SCANIN 9 input for scan chain V

DD1

10 supply voltage 1 T0 11 test mode switch 0 GND1 12 ground 1 T1 13 test mode switch 1 WE V

DD2

od

14 write enable odd samples

15 supply voltage 2 GND2 16 ground 2 WE V

O0

V

O1

U

O0

U

O1

Y

O0

Y

O1

O

17 write enable output

18 V output bit 0

19 V output bit 1

20 U output bit 0

21 U output bit 1

22 luminance output bit 0

23 luminance output bit 1

SYMBOL PIN DESCRIPTION

Y

O2

Y

O3

Y

O4

Y

O5

Y

O6

Y

O7

24 luminance output bit 2 25 luminance output bit 3 26 luminance output bit 4 27 luminance output bit 5 28 luminance output bit 6

29 luminance output bit 7 GND3 30 ground 3 CLK 31 system clock GND4 32 ground 4 V

DD3

33 supply voltage 3 SNDA 34 data input from interface

SNERT bus

SNCL 35 clock input from interface

SNERT bus

VRST 36 reset input in the vertical

blanking interval

Y

I7

Y

I6

Y

I5

Y

I4

Y

I3

Y

I2

Y

I1

Y

I0

37 luminance input bit 7

38 luminance input bit 6

39 luminance input bit 5

40 luminance input bit 4

41 luminance input bit 3

42 luminance input bit 2

43 luminance input bit 1

44 luminance input bit 0

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Philips Semiconductors Preliminary speciﬁcation

PANorama-IC (PAN-IC) SAA4995WP

handbook, full pagewidth

WE

TEST

SCANIN

V

DD1

T0

GND1

T1

WE

od

V

DD2

GND2

WE

DD4

CL16

VI0VI1UI0UI1Y

V 6

5

4

3

2

7

I

8

9 10 11 12 13 14 15 16 17

O

18

19

O1UO0UO1YO0YO1YO2

O0

V

SAA4995WP

21

20

22

I0

I1

YI2YI3Y

Y

1

44

43

42

23

24

25

26

O3

YO4YO5Y

Y

I4

41

40

39

Y

I5

Y

38

I6

37

Y

I7

36

VRST SNCL

35 34

SDNA V

33

DD3

GND4

32

CLK

31 30

GND3 Y

29

O7

27

28

MGK175

O6

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.

4

with a factor

⁄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 WE

I

• 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