Philips Semiconductors
Product specification
I2C-bus autosync deflection controller for
PC monitors
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;
CVCAP = 100 nF
40
42
−
43.3
160
−
Hz
Hz
V
fcr(V)
vertical frequency catching
range
constant amplitude; note 7 50
VVREF
td(scan)
voltage at reference input for
vertical oscillator
−
3.0
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
350
300
395
µs
µs
305
IVAGC
currents of amplitude control
control bit AGCDIS = 0
control bit AGCDIS = 1
±120
−
±200
±300
−
µA
µA
nF
0
CVAGC
external capacitor at VAGC
(pin 22)
150
−
220
Differential vertical current outputs
ADJUSTMENT OF VERTICAL SIZE INCLUDING VGA AND EHT COMPENSATION; see Figs 3 and 4
VGAIN
vertical size (gain) without
VGA overscan (referenced to
nominal vertical size)
register VGAIN = 0;
register VSIZE = 127;
bit VOVSCN = 0; note 8
−
70
−
%
%
%
%
%
%
register VGAIN = 63;
register VSIZE = 127;
bit VOVSCN = 0; note 8
−
100
60
−
VSIZE
vertical size (size) without VGA register VSIZE = 0;
overscan (referenced to
nominal vertical size)
−
−
register VGAIN = 63;
bit VOVSCN = 0; note 8
register VSIZE = 127;
register VGAIN = 63;
bit VOVSCN = 0; note 8
−
100
70
−
VSIZEVGA
vertical size with VGA
overscan (referenced to
nominal vertical size)
register VSIZE = 0;
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 IVSMOD = 0
size via VSMOD (pin 21)
(referenced to 100% vertical
size)
−
−
0
−
−
%
%
IVSMOD = −120 µA
−7
Ii(VSMOD)
input current (pin 21)
VSMOD = 0
−
0
−
µA
µA
Ω
VSMOD = −7%
−
−120
−
−
Ri(VSMOD)
input resistance
300
−
500
−
Vref(VSMOD)
reference voltage at input
5.0
V
1999 Jul 13
20
NXP [ NXP ]
