Philips Semiconductors
Product specification
I2C-bus autosync deflection controller for
PC monitors
TDA4841PS
CHARACTERISTICS
VCC = 12 V; Tamb = 25 °C; peripheral components in accordance with Fig.1; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Horizontal sync separator
INPUT CHARACTERISTICS FOR DC-COUPLED TTL SIGNALS: PIN HSYNC
Vi(HSYNC)
VHSYNC(sl)
tr(HSYNC)
sync input signal voltage
slicing voltage level
1.7
−
−
V
1.2
10
10
0.7
−
1.4
−
1.6
500
500
−
V
rise time of sync pulse
fall time of sync pulse
minimum width of sync pulse
input current
ns
ns
µs
µA
µA
tf(HSYNC)
−
tW(HSYNC)(min)
Ii(HSYNC)
−
Vi(HSYNC) = 0.8 V
i(HSYNC) = 5.5 V
−
−200
10
V
−
−
INPUT CHARACTERISTICS FOR AC-COUPLED VIDEO SIGNALS (SYNC-ON-VIDEO, NEGATIVE SYNC POLARITY)
VHSYNC
sync amplitude of video input
signal voltage
Rsource = 50 Ω
−
300
−
mV
mV
VHSYNC(AC,sl)
slicing voltage level
Rsource = 50 Ω
90
120
150
(measured from top sync)
Vclamp(HSYNC)
Ich(HSYNC)
top sync clamping voltage level Rsource = 50 Ω
1.1
1.7
1.28
2.4
1.5
3.4
V
charge current for coupling
capacitor
Vi(HSYNC) > Vclamp(HSYNC)
µA
tW(HSYNC)(min)
Rsource(max)
minimum width of sync pulse
maximum source resistance
differential input resistance
0.7
−
−
−
µs
Ω
duty cycle = 7%
during sync
−
1500
Ri(diff)(HSYNC)
−
80
−
Ω
Automatic polarity correction for horizontal sync
horizontal sync pulse width
related to tH
−
−
−
25
%
tP(H)
----------
tH
td(HPOL)
delay time for changing polarity
0.3
1.8
ms
Vertical sync integrator
tint(V) integration time for generation
of a vertical trigger pulse
fH = 15.625 kHz;
IHREF = 0.52 mA
14
7
20
26
µs
µs
µs
µs
fH = 31.45 kHz;
IHREF = 1.052 mA
10
13
fH = 64 kHz;
IHREF = 2.141 mA
3.9
2.5
5.7
3.8
6.5
4.5
fH = 100 kHz;
IHREF = 3.345 mA
Vertical sync slicer (DC-coupled, TTL compatible): pin VSYNC
Vi(VSYNC)
VVSYNC(sl)
Ii(VSYNC)
sync input signal voltage
slicing voltage level
input current
1.7
1.2
−
−
−
V
1.4
−
1.6
±10
V
0 V < Vi(VSYNC) < 5.5 V
µA
1999 Oct 25
15
NXP [ NXP ]
