SAA4945H/V1 データシートの表示（PDF） - Philips Electronics
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SAA4945H/V1 Datasheet PDF : 20 Pages
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Philips Semiconductors
LIne MEmory noise Reduction IC
(LIMERIC)
Preliminary specification
SAA4945H
FEATURES
• 2-D adaptive vertically recursive noise reduction
• Noise reduction for Y, U and V signals in 4 : 1 : 1 format
• Single 5 V ±10% power supply
• Communication by means of serial communication
protocol 83C654 (SNERT bus)
• Via SNERT bus, 10 different types of noise reduction
selectable; the noise reduction function can also be
disabled
• Phase relation write enable input/output signal
simultaneously switchable over one clock period w.r.t.
input/output samples
• 8-bit wide data processing for Y, U and V; in unsigned
format (Y signal) and in 2’s complement (U and V
signals)
• One fixed line locked clock operation frequency up to
16 MHz (typical)
• Exactly one line delay.
GENERAL DESCRIPTION
The SAA4945H, LIMERIC (LIne MEmory noise Reduction
IC) is a 2-D recursive noise reduction filter for both
luminance and colour difference signals. The noise
reduction is automatically adapted to the global noise level
in the image. Ten different preferences of noise reduction
can be set using a synchronous receiver transmitter bus;
SNERT (Synchronous No parity Eight bit Receive
Transmit) bus. Alternatively, the noise reduction can be
switched off. The LIMERIC is generally placed directly
after the ADC in the feature box and works fully in the 1fh
(50/60 Hz) domain.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
VDD
IDD
P
fCLK
fSNERT
Tamb
supply voltage (pins 5, 29 and 30)
supply current
power dissipation
clock frequency
bus clock frequency
operating ambient temperature
Note
1. Maximum number of clocks per line is 1024.
CONDITIONS
±7%; note 1
MIN.
4.5
−
−
10
−
0
TYP.
5.0
70
350
16
−
−
MAX.
5.5
−
−
17.1
1
70
UNIT
V
mA
mW
MHz
MHz
°C
ORDERING INFORMATION
TYPE
NUMBER
SAA4945H
PACKAGE
NAME
DESCRIPTION
VERSION
QFP44 plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 × 10 × 1.75 mm SOT307-2
1997 Jun 10
2
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