TDA4555 Philips Semiconductors, TDA4555 Datasheet - Page 8

• Manufacturer Part Number: TDA4555
• Description: Multistandard decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Notes
1. Value measured without influence of external circuitry.
2. Relative to phase at V
3. Or not connected.
4. The signal amplitude of the colour difference signals (R-Y) and (B-Y) is dependent on the characteristics of the
5. The sandcastle pulse is compared with three internal threshold levels, which are proportional to the supply voltage.
November 1984
Sandcastle pulse detector (see note 5)
Input voltage pulse levels (pin 24)
Input voltage during horizontal scanning
Input current
Multistandard decoder
to separate vertical and horizontal blanking pulses
required pulse amplitude
to separate horizontal blanking pulse
required pulse amplitude
to separate burst gating pulse
required pulse amplitude
external tuned circuits at pins 7, 8 and 4, 5 respectively. Adjustment of the amplitude is achieved by varying the
Q-factor of these tuned circuits. The resonant frequency must be adjusted such that the demodulated output
frequency (f
o
) provides the same output level as the internally inserted reference voltage (achromatic value).
PARAMETER
17-9
= 3 V.
8
V
V
V
V
V
V
V
I
24-9
24-9(p-p)
24-9
24-9(p-p)
24-9
24-9(p-p)
24-9
SYMBOL
24
1,2
2,0
3,2
4,0
6,5
7,7
MIN.
TYP.
Product specification
TDA4555
TDA4556
2,0
3,0
4,0
5,0
7,7
V
1,0
100
MAX.
P
V
V
V
V
V
V
V
UNIT
A