TDA9209 datasheet(4/22 Pages) STMICROELECTRONICS

No. de pieza	TDA9209

Descripción Electrónicos	150 MHz PIXEL VIDEO CONTROLLER FOR MONITORS INCLUDING CUT-OFF INPUTS AND VIDEO DETECTION

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TDA9209

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Additionally, the IC automatically works with either

positive or negative HSYNC pulses.

– When bit 0 is set to 1, BPCP is synchronized on

the leading edge of the blanking pulse BLK

(Pin 24). One can use a positive or negative

blanking pulse by programming bit 0 in

Register 9 (See I

2C Table 3).

– BPCP width can be adjusted with bit 2 and 3 (see

Register 8, I2C table 2).

– If the application already provides the Back

Porch Clamping Pulse, bit 4 must be set to 1

(providing a direct connection between Pin 23

and internal BPCP).

4.2 Synchro Clipping Function

This function is available on channel 2 (Green

Channel). When using the Sync On Green (SOG)

(Synchro pulse included in the green channel in-

put) the synchro clipping function must be activat-

ed (bit 7 set to 1 in register 9) in order to keep the

right green output levels and avoid unbalanced

colours.

4.3 Blanking Input

The Blanking pin (FBLK) is TTL compatible.

The Blanking pulse can be:

– positive or negative

– line or Composite-type (but not Frame-type).

4.4 Contrast Adjustment (8 bits)

The contrast adjustment is made by controlling si-

multaneously the gain of the three internal amplifi-

ers through the I2C bus interface. Register 1 al-

lows the adjustment in a range of 48 dB.

Figure 1.

4.5 ABL Control

The TDA9209 includes an ABL (automatic beam

limitation) input to attenuate the RGB Video sig-

nals depending on the beam intensity.

The operating range is 2 V (from 3 V to 1 V). A typ-

ical 15 dB maximum attenuation is applied to the

output signal whatever the contrast adjustment is.

(See Figure 2 ).

When the ABL feature is not used, the ABL input

(Pin 2) must be connected to a 5 V supply voltage.

R8b0=0 and R8b1=0

HSYNC/BPCP (Pin23)

Internal BPCP

R8b0=0 and R8b1=1

HSYNC/BPCP (Pin23)

Internal BPCP

R8b0=1

BLK (Pin24)

Internal BPCP

R8b4 =1

HSYNC/BPCP (Pin23)

Internal BPCP

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