TDA9210 datasheet(7/19 Pages) STMICROELECTRONICS

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TDA9210

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Figure 4. Waveforms (Drive adjustment)

4.10 - Bandwidth Adjustment

A new feature: Bandwidth adjustment, has been

implemented on the TDA9210.

This function has several advantages:

– Depending on the external capacitive load and

on the peak-to-peak output voltage, the band-

width can be adjusted to avoid any slew-rate

phenomenon.

– The preamp bandwidth can be adjusted in order

to reduce electromagnetic radiation, since it is

possible to slow down the signal rise/fall time at

the CRT driver input without too much affecting

the rise/fall time at the CRT driver output.

– It is possible to optimize the ratio of the frequen-

cy response versus the CRT driver power con-

sumption for any kind of chassis, as the preamp

bandwidth adjustment also allows the adjust-

ment of the rise/fall time on the cathode (through

the CRT driver).

– In still picture mode, when a high Video swing

voltage is of greater interest than rise/fall time,

bandwidth adjustment is used to avoid any slew-

rate phenomenon at the CRT driver output and to

meet electromagnetic radiation requirements.

4.11 - CRT Cathode Coupling (Figure 5)

The TDA9210 is designed to be used in DC cou-

pling mode, enabling to build a powerful video sys-

tem on a small PCB Board and giving a substantial

cost saving compared with any other solution

available on the market.

The preamplifier outputs control directly the cut-off

levels.

The output DC level (VDC) is adjusted independ-

ently for each channel from 0.5 V to 2.5 V via reg-

isters 10, 11 and 12.

In DC coupling mode, bit 2 must be set to 1 and

bit3 to 0 in Register 9.

HSYNC

BPCP

BLK

Video IN

BFLK

OSD IN

VCONT

Two examples of drive

adjustment (1)

VBLACK

VDC

VBRT

VOSD

VOUT1,VOUT2,VOUT3

Note :

1.Drive adjustment modifies the following voltages : VCONT,VBRT and VOSD.

Drive adjustment doesn’t modify the following voltages : VDC and VBLACK.

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