TDA9209 查看數據表（PDF） - STMicroelectronics

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TDA9209

150 MHZ PIXEL VIDEO CONTROLLER WITH CUT-OFF OUTPUTS AND VIDEO DETECTION

STMicroelectronics 

TDA9209

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

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.

Figure 5. AC Coupling

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.

4.11.4 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.

TDA9209

Pins 17-19-21

CRT

Driver

CRT

DC LEVEL (4bits)

0.5V to 2.35V

CUT-OFF 1,2,3 DC LEVEL

0.17V to 4.6V(8bits)

Pins15-16-22

Figure 6. DC Coupling with Cut-off Control

TDA9209

Pins 17-19-21

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

Cut-off Control

CRT

TDA9533/9530

8/22

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