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TDA4856 Datasheet, PDF (20/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors
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Philips Semiconductors
I2C-bus autosync deflection controller for
PC monitors
Product specification
TDA4856
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Vertical oscillator [oscillator frequency in application without adjustment of free-running frequency ffr(V)]
ffr(V)
free-running frequency
RVREF = 22 kΩ;
40
42
43.3 Hz
CVCAP = 100 nF
fcr(V)
vertical frequency catching constant amplitude; note 7 50
−
160 Hz
range
VVREF
voltage at reference input for
vertical oscillator
−
3.0
−
V
td(scan)
delay between trigger pulse
and start of ramp at VCAP
(pin 24) (width of vertical
blanking pulse)
control bit VBLK = 0
control bit VBLK = 1
220 260 300 µs
305 350 395 µs
IVAGC
currents of amplitude control control bit AGCDIS = 0
control bit AGCDIS = 1
±120 ±200 ±300 µA
−
0
−
µA
CVAGC
external capacitor at VAGC
(pin 22)
150 −
220 nF
Differential vertical current outputs
ADJUSTMENT OF VERTICAL SIZE INCLUDING VGA AND EHT COMPENSATION; see Figs 3 and 4
VGAIN
vertical size (gain) without
register VGAIN = 0;
−
70
−
%
VGA overscan (referenced to register VSIZE = 127;
nominal vertical size)
bit VOVSCN = 0; note 8
register VGAIN = 63;
−
100 −
%
register VSIZE = 127;
bit VOVSCN = 0; note 8
VSIZE
vertical size (size) without VGA register VSIZE = 0;
−
60
−
%
overscan (referenced to
register VGAIN = 63;
nominal vertical size)
bit VOVSCN = 0; note 8
register VSIZE = 127;
−
100 −
%
register VGAIN = 63;
bit VOVSCN = 0; note 8
VSIZEVGA
vertical size with VGA
overscan (referenced to
nominal vertical size)
register VSIZE = 0;
−
70
−
%
register VGAIN = 63;
bit VOVSCN = 1; note 8
register VSIZE = 127;
register VGAIN = 63;
bit VOVSCN = 1; note 8
115.9 116.8 117.7 %
VSMODEHT
EHT compensation on vertical
size via VSMOD (pin 21)
(referenced to 100% vertical
size)
IVSMOD = 0
IVSMOD = −120 µA
−
0
−
%
−
−7
−
%
Ii(VSMOD)
input current (pin 21)
VSMOD = 0
VSMOD = −7%
−
0
−
µA
−
−120 −
µA
Ri(VSMOD)
Vref(VSMOD)
input resistance
reference voltage at input
300 −
−
5.0
500 Ω
−
V
1999 Jul 13
20
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