TDA8844 datasheet(60/68 Pages) PHILIPS

60 / 68 page

December 16, 1997

Philips Semiconductors

Tentative Device Speciﬁcation

I2C-bus controlled PAL/NTSC/SECAM TV

processors

TDA884X/5X-N2 series

East-West output stage

In order to obtain correct tracking of the vertical and

horizontal EHT-correction, the EW output stage should be

dimensioned as illustrated in Fig.24.

Resistor REW determines the gain of the EW output stage.

Resistor Rc determines the reference current for both the

vertical sawtooth generator and the geometry processor.

The preferred value of Rc is 39 kΩ which results in a

reference current of 100

µA (Vref = 3.9 V).

The value of REW must be:

Example: With Vref = 3.9 V; Rc =39kΩ and Vscan = 120 V

then REW =68kΩ.

scan

ref

-----------------------

handbook, full pagewidth

MLA744 - 1

TDA8366

HORIZONTAL

DEFLECTION

STAGE

DIODE

MODULATOR

VDD

V scan

V EW

Rew

EW output

stage

EWD

Csaw

100 nF

(5%)

Vref

39 k

Ω

(2%)

I ref

Fig.24 East-West output stage.

TDA

884X

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