TDA4857 datasheet(21/56 Pages) PHILIPS

21 / 56 page

2000 Jan 31

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4857PS

VHEHT(EWDRV)

EHT compensation on

horizontal size via HSMOD

(pin 31)

IHSMOD = 0; note 8

−

0.69

−

IHSMOD = −120 µA; note 8

−

0.02

−

Ii(HSMOD)

input current (pin 31)

VHEHT = 0.02 V

−

−µA

VHEHT = 0.69 V

−−120

−µA

Ri(HSMOD)

input resistance

300

−

500

Ω

Vref(HSMOD)

reference voltage at input

IHSMOD =0

−

5.0

−

fro(HSMOD)

roll-off frequency (

−3 dB)

IHSMOD = −60 µA+15 µA

(RMS)

−−

MHz

TRACKING OF EWDRV OUTPUT SIGNAL WITH HORIZONTAL FREQUENCY PROPORTIONAL VOLTAGE

fH(MULTI)

horizontal frequency range for

tracking

−

kHz

VPAR(EWDRV)

parabola amplitude at EWDRV

(pin 11)

IHREF = 1.052 mA;

fH = 31.45 kHz;

control bit FHMULT = 1;

note 10

−

0.72

−

IHREF = 2.341 mA;

fH = 70 kHz;

control bit FHMULT = 1;

note 10

−

1.42

−

function disabled;

control bit FHMULT = 0;

note 10

−

1.42

−

LEEWDRV

linearity error of horizontal

frequency tracking

−−

Output for asymmetric EW corrections: pin ASCOR

VHPARAL(ASCOR)

vertical sawtooth voltage for

EW parallelogram correction

control bit HPC = 0; note 8

−−0.825 −

control bit HPC = 0; note 8

−

0.825

−

control bit HPC = 1; note 8

−

0.05

−

VHPINBAL(ASCOR)

vertical parabola voltage for pin

unbalance correction

control bit HBC = 0; note 8

−−1.0

−

control bit HBC = 0; note 8

−

1.0

−

control bit HBC = 1; note 8

−

0.05

−

Vo(ASCOR)(max)(p-p) maximum output voltage swing

(peak-to-peak value)

−

Vo(ASCOR)(max)

maximum output voltage

−

6.5

−

Vc(ASCOR)

centre voltage

−

4.0

−

Vo(ASCOR)(min)

minimum output voltage

−

1.9

−

Io(ASCOR)(max)

maximum output current

VASCOR ≥ 1.9 V

−−1.5

−

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

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