TDA4855 datasheet(13/44 Pages) PHILIPS

13 / 44 page

1996 Jul 18

Philips Semiconductors

Preliminary speciﬁcation

Autosync Deﬂection Controller (ASDC)

TDA4855

CHARACTERISTICS

VCC =12V; 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 [HSYNC (PIN 15)]

VDC(HSYNC)

sync input signal voltage

1.7

−−

slicing voltage level

1.2

1.4

1.6

tr(HSYNC)

rise time of sync pulse

−

500

tf(HSYNC)

fall time of sync pulse

−

500

tW(HSYNC)

minimum width of sync pulse

0.7

−−µs

IDC(HSYNC)

input current

VHSYNC = 0.8 V

−−−200

µA

VHSYNC = 5.5 V

−−

µA

INPUT CHARACTERISTICS FOR AC-COUPLED VIDEO SIGNALS (SYNC-ON-VIDEO, NEGATIVE SYNC POLARITY)

VAC(HSYNC)

sync amplitude of video input

signal voltage

−

300

−

slicing voltage level

(measured from top sync)

source resistance

RS =50 Ω

120

150

Vclamp(HSYNC)

top sync clamping voltage level

1.1

1.28

1.5

IC(HSYNC)

charge current for coupling

capacitor

VHSYNC > Vclamp(HSYNC)

1.7

2.4

3.4

µA

tHSYNC(min)

minimum width of sync pulse

0.7

−−µs

RS(max)

maximum source resistance

duty factor = 7%

−−

1500

Ω

rdiff(HSYNC)

differential input resistance

during sync

−

−Ω

Automatic polarity correction for horizontal sync

horizontal sync pulse width

related to tH

fH < 45 kHz

−−

fH > 45 kHz

−−

tP(H)

delay time for changing polarity

0.3

−

1.8

Vertical sync integrator

tint(V)

integration time for generation

of a vertical trigger pulse

fH = 31.45 kHz;

IHREF = 1.052 mA

710

µs

fH = 64 kHz;

IHREF = 2.141 mA

3.9

5.7

6.5

µs

fH = 100 kHz;

IHREF = 3.345 mA

2.5

3.8

4.5

µs

Vertical sync slicer (DC-coupled, TTL compatible) [VSYNC (pin 14)]

VVSYNC

sync input signal voltage

1.7

−−

slicing voltage level

1.2

1.4

1.6

IVSYNC

input current

0 V

< VSYNC < 5.5 V

−−±10

µA

()

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