TDA4887PS datasheet(37/68 Pages) PHILIPS

37 / 68 page

2001 Oct 19

Philips Semiconductors

Product speciﬁcation

160 MHz bus-controlled monitor video

preampliﬁer

TDA4887PS

12 TEST AND APPLICATION INFORMATION

handbook, full pagewidth

to cathode

70 V

Application with integrated

post amplifier, AC-coupled cathode

and black level restoration cicuit.

Application with integrated

post amplifier, DC-coupled cathode

and negative feedback.

TDA4887PS

I2C-BUS

BLACK LEVEL

RESTORATION

output clamping

blanking

pull-up

resistors

to cathode

subcontrast setting

contrast modulation input

90 V

Application with discrete

post amplifier, DC-coupled

cathode and negative

feedback.

to cathode

limiting input

input clamping

vertical blanking

OSD

inputs

signal inputs

channel 1

channel 2

channel 3

fast blanking

5 V

8 V

MHB933

Fig.16 Basic applications for different kinds of post amplifiers with DC or AC coupling.

12.1

Test board

For high frequency measurements, a special test board

with only a few external components can be built. It utilizes

the internal positive feedback of the output signals during

output clamping with control bit FPOL = 1. Figure 17

shows the test circuit and Figs 18 and 19 show the layout

and mounting of the double-sided printed-circuit board.

Most components are SMD-type. Short HF loops and

minimum crosstalk between channels and between signal

inputs and outputs are achieved by using properly shaped

ground areas.

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