STV9211 STMicroelectronics, STV9211 Datasheet - Page 12

• Manufacturer Part Number: STV9211
• Manufacturer: STMicroelectronics

Specifications of STV9211

• Lead Free Status / Rohs Status: Compliant

Functional description
2.8
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Cut-off adjustment, Infra-black level (Vib) (3x8 bits)
The Infra-black level (Vib) is the output voltage during the blanking time (BLK). This level is sampled
after each line (sample - and - hold block) during an internal pulse (OCL) which is generated during
the blanking pulse (see
The STV9211 allows to adjust independantly the cut-off levels of the 3 video outputs with a high
resolution. This is done via 3 registers (IBR, IBO and IBL) programming respectively:
Infra-black range register (IBR: Register 14, bit 0. See I²C table 6)
This register must be selected first, 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
Infra-black offset register (IBO: Register 14, bit 1, 2 & 3. See I²C table 6)
This register select the Vib offset. It allows to keep the video signal inside the linearity area of
the amplifier.
The value of this register depends on the amplifier high voltage supply (Vdd).
In kit with the STV95xx amplifier family, we recommend the following programming:
Example:
For Vdd=101V +/-5% and Brightness before Drive, IBO must be set to 100.
Infra-black level register (IBL: Register 10, 11, 12. See I²C table 1)
These three 8 bit- registers adjust independantly the infra-black level of the 3 outputs with a high
resolution (typically 100mV at 26V range or 140mV at 36V range)
the range: 1.3 or 1.8V (i.e: 26 or 36V in kit with the STV95xx amplifiers)
the offset (to keep the video signal inside thelinear area)
the level.
87 and below
112 to 115V
107 to 111V
102 to 106V
Vdd (±5%)
97 to 101V
92 to 96V
88 to 91
Table 1: Setting of the infra-black offset register (IBO)
Figure 4
Brightness before Drive
Binary
001
010
011
100
101
110
111
).
Case 1:
Decimal
1
2
3
4
5
6
7
Figure 8
Brightness after Drive
Binary
011
100
101
110
111
111
111
Case 2:
)
.
Decimal
3
4
5
6
7
7
7
STV9211