SAA7152 Datasheet, PDF (2/15 Pages) NXP Semiconductors – Digital Video Comb Filter DCF

Philips Semiconductors
Digital Video Comb Filter (DCF)
Product specification
SAA7152
FEATURES
• Comb filter circuit for luminance and chrominance
separation
• Applicable for standards
– PAL B/G, M and N
– PAL 4.43 (525 lines, 60 Hz)
– NTSC M and N
– NTSC 4.43 (50 and 60 Hz)
• Luminance and chrominance bypasses with short delay
in case of no filtering
• Line-locked system clock; CCIR-compatible
• I²C-bus controlled
GENERAL DESCRIPTION
The CMOS digital comb filter circuit is located between
video analog-to-digital converters and the video
multistandard decoder SAA7151B (not applicable for
SAA7191B). The two-dimensional filtering is only
appropriate for standard signals from a source with
constant phase relationship between subcarrier signal and
horizontal frequency. The comb-filter has to be switched
off for VTR-signals and for separate VBS and C signals. In
VCR and S-Video operation the luminance low-pass and
the chrominance bandpass parts can still be used for noise
reduction purposes. The processing delay is:
21 × LL27 clocks in active mode, or
3 × LL27 in short delay bypass mode (BYPS = 1)
QUICK REFERENCE DATA
SYMBOL
V_DD
I_P
V_i
V_o
LL27
T_amb
PARAMETER
supply voltage (pins 11, 34, 44)
total supply current
input levels
output levels
typical system clock frequency
operating ambient temperature range
MIN.
TYP.
4.5
5.0
−
85
TTL-compatible
TTL-compatible
−
27
0
−
MAX.
5.5
180
−
70
UNIT
V
mA
MHz
°C
ORDERING INFORMATION
EXTENDED
TYPE NUMBER
SAA7152
PINS
44
Note
1. SOT187-2; 1997 January 06.
PACKAGE
PIN POSITION
PLCC
MATERIAL
plastic
CODE
SOT187 ⁽¹⁾
August 1996
2