TDA9209 datasheet(8/22 Pages) STMICROELECTRONICS

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TDA9209

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4.11.2 DC Coupling with cut-off controls on

Video Amplifier (with TDA9533/ 9530, Figure 6)

The functioning and programming of the TDA9209

are the same as for the previous mode, except for

the cut-off control which is now performed via the

Video amplifier cut-off input .

In AC coupling and DC coupling with cut-off con-

trol, bits 2, 3 and 4 in Register 9 must be set to 1.

4.11.3 DC Coupling Mode (Figure 7)

This is the most commonly used configuration en-

abling to build a powerful video system 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.

4.11.4 DC Coupling with feedback mode (Fig. 8)

In this mode, the feedback voltage issued from the

cathode is sent to the TDA9209. This voltage is

compared to a reference from the cut-off DC level

DAC by the sample and hold circuit who also con-

trols the DC voltage of the feedback input in a

range of 0.5 V to 2.5 V.

Each channel is independently controlled via Reg-

isters 10, 11 and 12.

In DC coupling with feedback mode, bit 2 and bit 4

must be set to 0 in Register 9.

Figure 5. AC Coupling

Figure 6. DC Coupling with Cut-off Control

TDA9209

DC LEVEL (4bits)

0.5V to 2.35V

CUT-OFF 1,2,3 DC LEVEL

0.17V to 4.6V(8bits)

Pins

CRT

Driver

CRT

Pins15-16-22

Cut-off Control

17-19-21

TDA9209

DC LEVEL (4bits)

0.5V to 2.35V

CUT-OFF 1,2,3 DC LEVEL

0.17V to 4.6V (8bits)

Pins 15-16-22

Pins 17-19-21

TDA9533/9530

CRT

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