TDA4887PS datasheet(46/68 Pages) PHILIPS

46 / 68 page

2001 Oct 19

Philips Semiconductors

Product speciﬁcation

160 MHz bus-controlled monitor video

preampliﬁer

TDA4887PS

3. R, G, B gains (white point)

a) Set brightness at nominal (40H)

b) Apply full video white area (700 mV)

c) Activate the computer

d) The computer will adjust the R, G, B gains to meet

the following three conditions:

x = 0.313

y = 0.329

Y = 102.8 cd/m2

For each 3 (2.8) gain increments, the computer will

decrement the black references by one step.

The effect on cathode voltages is demonstrated in Fig.23.

After step 2 the voltages at 18.8% drive are correct but not

those at 100% drive (white) and 0% (black). After step 3

the voltages at 18.8% drive have not changed but white as

well as black voltages are correct now. Any brightness

setting (

−10 to +30%) relates to the individual maximum

video amplitude (black-to-white).

This alignment procedure is adaptable to DC-coupled as

well as AC-coupled cathodes.

handbook, full pagewidth

MHB954

step 2:

Black level references

adjusted with 18.8% drive

and gain set to 80H.

step 1:

Black level references

and gain set to 80H.

cut-off voltage range

from black level

references

(13

× 5.75 to 13 × 3.95)

black

white

18.8%

step 3:

Gain adjustment at 100% white with

automatic black level reference correction.

Cathode voltages for 18.8% drive left

unchanged.

cathode

voltage

(V)

Fig.23 Automatic factory alignment.

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