Philips Semiconductors
Horizontal/vertical synchronization circuit
Preliminary specification
TDA2579B
PARAMETER
CONDITIONS
Temperature coefficient
horizontal output pulse
Influence of delay time on pulse
width of the horizontal output
signal
Sandcastle output signal (pin 17)
IL = 1 mA
Output voltage during:
burst-key
horizontal blanking
vertical blanking
Zero level output voltage
Pulse width:
burst-key (50 Hz)
burst-key (60 Hz)
Horizontal blanking
Vertical blanking
Phase position burstkey
time between middle sync
pulse at pin 5 and start of
burst pulse at pin 17
Time between start sync pulse
and end of burst pulse at pin 17
(50 Hz)
(60 Hz)
IL = 0.3 mA
Isink = 0.5 mA
note 5
Coincidence detector, video transmitter
identification circuit and time constant
switching levels (see also Fig.1)
Detector output current
Voltage level for in sync
condition (ϕ1 normal)
Voltage for noisy sync pulse
(ϕ1 slow and gated)
Voltage level for noise only
Switching level normal to fast
Switching level
mute output active and
fast to normal
Switching level frame period
counter (3 periods fast)
note 6
SYMBOL MIN.
−
∆HW/td −
V17
9.8
V17
4.1
V17
2.1
V17
−
tp
3.85
tp
3.40
V12
−
2.3
−
−
I18
−
V18
5.8
V18
9
V18
−
V18
< 3.2
V18
< 1.0
V18
< 0.08
TYP.
−5.10-2
0.16
10.4
4.5
2.5
−
4.15
3.65
1.0
2.7
9.3
8.8
0.25
6.5
10
0.3
3.5
1.2
0.12
MAX. UNIT
−
µs/°C
−
µs/µs
−
V
4.9
V
2.9
V
0.7
V
4.6
µs
4.0
µs
−
V
3.1
µs
9.7
µs
9.2
µs
−
mA
7.0
V
−
V
−
V
3.8
V
1.4
V
0.16
V
September 1990
14