STV9211 STMicroelectronics, STV9211 Datasheet - Page 29

• Manufacturer Part Number: STV9211
• Manufacturer: STMicroelectronics

Specifications of STV9211

• Lead Free Status / Rohs Status: Compliant

STV9211
10
10.1
STV9211 + STV9556/55/53 APPLICATIONS HINTS
InfraBlack adjustment procedure (Cut-off)
The STV9211 allows to adjust independantly the InfraBlack levels of the 3 video outputs with a high
resolution. This ajustment is done via the 3 infra-black level registers (IBL1, IBL2 and IBL3). In
order to have the optimum resolution, it is necessary, first, to set the video signal inside the linear
area of the amplifier, by programing the infra-black range register IBR (26 or 36V) and the infra-
black offset register IBO.
Example:
For Vdd=101V +/-5% and Brightness before Drive, IBO must be set to 100.
Step 1
Setting of the infra-black range register IBR (Register 14, bit 0. See I²C table 6).
This register must be selected, either to 1.3V to get a 26V Cut-off adjustment range with the
STV95xx amplifier or to 1.8V to get a 36V range (see
Step 2
Setting of the Infra-black offset register IBO (Register 14, bit 1, 2 & 3. See I²C table 6).
This register selects the Vib Offset. It allows to keep the video signal inside the linearity area of
the amplifier.
The register value depends on the amplifier high voltage supply (Vdd).
In kit with the STV95xx amplifier family, we recommend the following programming:
87 and below
112 to 115V
107 to 111V
102 to 106V
Vdd (±5%)
97 to 101V
92 to 96V
88 to 91
Table 8: Setting of the infra-black offset register (IBO)
Brightness before Drive
Binary
001
010
011
100
101
110
111
Case 1:
Decimal
1
2
3
4
5
6
7
STV9211 + STV9556/55/53 applications hints
Figure 16
Brightness after Drive
Binary
011
100
101
110
111
111
111
Case 2:
)
Decimal
3
4
5
6
7
7
7
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