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參數(shù)資料
| 型號(hào)： | SAA4995WP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Panorama-IC (PAN-IC)(全景畫(huà)面IC) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC44 |
| 封裝： | PLASTIC, SOT-187, LCC-44 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 107K |
| 代理商： | SAA4995WP |
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1997 Jun 10
5
Philips Semiconductors
Preliminary specification
PANorama-IC (PAN-IC)
SAA4995WP
Fig.2 Pin configuration.
handbook, full pagewidth
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SAA4995WP
MGK175
YI5
YI6
YI7
VRST
SDNA
VDD3
GND4
CLK
GND3
YO7
WEI
TEST
SCANIN
VDD1
T0
GND1
WEod
VDD2
WEO
SNCL
C
V
V
U
U
Y
Y
Y
Y
V
Y
V
U
U
Y
Y
Y
Y
Y
Y
V
Y
T1
GND2
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:
X
0l
and X
0r
, 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)
X
1l
and X
1r
, points from where a new curve can be
programmed for its 2nd derivative (for areas III and IV)
X
2l
corresponds to the first sample in the output data
stream, defined by start of WE
I
X
2r
corresponds to the last sample in the output data
stream, defined by the programmed number of samples
C
1
, which controls the second derivatives of the data
rate in areas II and V
C
2
, which controls the second derivatives of the data
rate in areas III and IV.
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