STV9211 STMicroelectronics, STV9211 Datasheet - Page 14

• Manufacturer Part Number: STV9211
• Manufacturer: STMicroelectronics

Specifications of STV9211

• Lead Free Status / Rohs Status: Compliant

Functional description
2.9
2.10
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ABL Control
The STV9211 includes an ABL (automatic beam limitation) input to attenuate the RGB Video
signals depending on the beam intensity.
The operating range is 2 V (from 3 V to 1 V). A typical 15 dB maximum attenuation is applied to the
output signal whatever the contrast adjustment is. (See
When not used, the ABL input (Pin 2) must be connected to a 5 V supply voltage.
OSD
Principle
The STV9211 allows to mix the OSD signals into the RGB main picture. The four pins dedicated to
this function are the following:
When a high level is present on the FBLK, the IC acts as follows:
Output level
If the OSD input is set to 0, the output is set to the black level (see
If the OSD input is at high level, the output voltage is set to: black-level + V
I
The same variation is applied simultaneously to the three channels providing the OSD contrast.
2
C bus-controlled voltage, adjustable between 0 V to 4.9 V by 306 mV steps via Register 7 (4 bits).
Three TTL RGB inputs (Pins 8, 9, 10) connected to the three outputs of the corresponding
OSD processor.
One TTL fast blanking input (Pin 11) also connected to the FBLK output of the OSD processor.
The three main picture RGB input signals (IN1, IN2, IN3) are internally switched to an internal
clamp reference voltage.
The three output signals (OUT1, OUT2, OUT3) are set to the voltage corresponding to the
three OSD input logic states (0 or 1). (See
-10
-12
-14
-16
-2
-4
-6
-8
Figure 9: ABL attenuation range
0
0
Attenuation (dB)
1
2
Figure 2
3
4
: Block diagram).
Figure 9
V
ABL
(V)
5
).
Figure 10
OSD
).
, where V
OSD
STV9211
is the