TDA4651 Datasheet, PDF (6/15 Pages) NXP Semiconductors – Multistandard colour decoder with negative colour difference output signals

Philips Semiconductors
Multistandard colour decoder with negative
colour difference output signals
Preliminary specification
TDA4651
positive again. In the event of a field
frequency of 60 Hz the signal cannot
be identified as a SECAM signal,
even if the P_IDENT is positive. If the
H/2 signal is of the wrong polarity, the
identification signal is negative and
the H/2 flip-flop is set to the correct
phase.
The third demodulator is
demodulating during NTSC
identification or reception only. It is
active during the burst clamping time.
The resulting identification signal
(N_IDENT) is positive for PAL and NTSC
4.43 MHz signal during the NTSC
4.43 part of the scanning and for
NTSC 3.58 MHz signal during the
NTSC 3.58 part of the scanning. The
reference signal has the (B-Y) phase.
The two identification signals allow an
unequivocal identification of the
received signal. If a signal has been
identified, the scanning is stopped
and after a delay time the colour is
switched on.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
V_P
V_I
I_O
I_I/O
T_amb
T_stg
P_tot
supply voltage (pin 13)
input voltage range at pins 1, 3, 17 and 24 to 28
output current (pins 1 and 3)
input/output current (pin 25 to 28)
operating ambient temperature range
storage temperature range
total power dissipation
SOT117
SOT261CG
MIN.
−
0
−
−
0
−25
MAX.
13.2
V_P
−5
−5
+70
+150
UNIT
V
V
mA
µA
°C
°C
−
1.4
W
−
1.1
W
THERMAL RESISTANCE
SYMBOL
R_{th j-a}
PARAMETER
from junction to ambient in free air
SOT117
SOT261CG
THERMAL RESISTANCE
37 K/W
70 K/W
August 1993
6