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LM1276 データシート(PDF) 8 Page - Texas Instruments

部品番号 LM1276
部品情報  Compatible RGB Preamplifier
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ホームページ  http://www.ti.com
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LM1276 データシート(HTML) 8 Page - Texas Instruments

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OBSOLETE
LM1276
SNOSAB9B – MAY 2005 – REVISED APRIL 2013
www.ti.com
Hexadecimal and Binary Notation
Hexadecimal numbers appear frequently throughout this document, representing slave and register addresses,
and register values. These appear in the format “0x...”. For example, the slave address for writing the registers of
the LM1276 is hexadecimal BA, written as 0xBA. On the other hand, binary values, where the individual bit
values are shown, are indicated by a trailing “b”. For example, 0xBA is equal to 10111010b. A subset of bits
within a register is referred to by the bit numbers in brackets following the register value. For example, the OSD
contrast bits are the fourth, fifth, and sixth bits of register 0x8538. Since the first bit is bit 0, the OSD contrast
register is 0x8538[5:3].
Register Test Settings
Table 1 shows the definitions of the Test Settings 1–8 referred to in the specifications sections. Each test setting
is a combination of five hexadecimal register values, Contrast, Gain (Blue, Red, Green) and DC offset.
Table 1. Test Settings
Test Settings
Control
No. of Bits
1
2
3
4
5
6
7
8
Contrast
7
0x7F (Max)
0x00
0x7F
0x7F
0x40
0x7F
0x7F
0x7F
Min
(Max)
(Max)
(50.4%)
(Max)
(Max)
(Max)
B, R, G
7
0x7F
0x7F
0x7F
Set VO to 2
0x7F
0x40
0x00
0x7F (Max)
Gain
(Max)
(Max)
(Max)
VP-P
(Max)
(50.4%)
(Min)
DC Offset
3
0x00 (Min)
0x05
0x07
0x05
0x05
0x05
0x05
0x05
(Max)
OSD VS Video Intensity
The OSD amplitude has been increased over the LM1237 level. During monitor alignment the three gain
registers are used to achieve the desired front of screen color balance. This also causes the OSD channels to be
adjusted accordingly, since these are inserted into the video channels prior to the gain attenuators. This provides
the means to fine-tune the intensity of the OSD relative to the video as follows. If a typical starting point for the
alignment is to have the gains at maximum (0x7F) and the contrast at 0x55, the resultant OSD intensity will be
higher than if the starting point is with the gains at 0x55 and the contrast at maximum (0x7F). This tradeoff allows
the fine-tuning of the final OSD intensity relative to the video. In addition, the OSD contrast register, 0x85C8[5:3],
provides 8 major increments of intensity. Together, these allow setting the OSD intensity to the most pleasing
level.
ESD Protection
The LM1276 features a 3.0 kV ESD protection level (see (1) and (2)). This is provided by special internal circuitry,
which activates when the voltage at any pin goes beyond the supply rails by a preset amount. This protection is
applied to all the pins, including SDA and SCL.
(1)
Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
(2)
Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specific voltage, then discharged
directly into the IC with no external series resistor (resistance of discharge path must be under 50
Ω).
8
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LM1276


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