tda4650 NXP Semiconductors, tda4650 Datasheet - Page 9

• Manufacturer Part Number: tda4650
• Description: Multistandard Colour Decoder, With Negative Colour Difference Output Signals
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Notes to the characteristics
1. For the SECAM standard, amplitude and H/2 ripple content of the CD signals (R Y) and (B Y) depend on the
2. The f
3. The inquiry sequence for the standard is: PAL
4. The super sandcastle pulse is compared with three internal threshold levels which are proportional to V
March 1991
Super sandcastle pulse detector (note 4)
V
I
24
SYMBOL
24
Multistandard colour decoder, with
negative colour difference output signals
characteristics of the external tuned circuit at pins 7 to 10. The resonant frequency of the external tuned circuit must
be adjusted such that the demodulated f
Now it is possible to adjust the quality of the external circuit such that the demodulated f
zero by the coil of the tuned circuit.
The external capacitors at the pins 2 and 4 (220 pF each) are matched to the internal resistances of the de-emphasis
network such that every alternate scanned line is blanked.
voltage at pin 17 is less than 0.5 V (burst OFF), thus providing double subcarrier frequencies of the chrominance
signal.
PAL has priority with respect to SECAM, etc.
(R Y) output channel at pin 1. If necessary, the f
o
frequencies of the 8.8 MHz crystal at pin 21, and the 7.2 MHz crystal at pin 19, can be adjusted when the
input voltage pulse levels to
separate V and H blanking pulses
voltage pulse amplitude
input voltage pulse levels to
separate H blanking pulse
voltage pulse amplitude
input voltage pulse levels to
separate burst gating pulse
voltage pulse amplitude
input voltage
input current
PARAMETER
o
voltage level is zero in the (B Y) output channel at pin 3.
pulse ON
pulse OFF
pulse ON
pulse OFF
pulse ON
pulse OFF
during line scan
during line scan
SECAM
o
voltage level in the (B Y) output channel must be readjusted to
CONDITIONS
9
NTSC (3.58 MHz)
1.3
1.1
2.0
3.3
3.1
4.1
6.2
6.0
7.7
MIN.
NTSC (4.43 MHz).
1.6
1.4
2.5
3.6
3.4
4.5
6.6
6.4
o
TYP.
voltage level is zero in the
Preliminary specification
1.9
1.7
3.0
3.9
3.7
4.9
7.0
6.8
V
1.0
100
TDA4650
P
MAX.
P
.
V
V
V
V
V
V
V
V
V
V
UNIT
A