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參數(shù)資料
| 型號： | LM1276AAA/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 49/50頁 |
| 文件大小： | 6075K |
| 代理商： | LM1276AAA/NA |
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Hexadecimal and Binary Notation
Hexadecimal numbers appear frequently throughout this doc-
ument, representing slave and register addresses, and reg-
ister 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 indi-
cated 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 combi-
nation of five hexadecimal register values, Contrast, Gain
(Blue, Red, Green) and DC offset.
TABLE 1. Test Settings
Control
No. of Bits
Test Settings
1
2
3
4
5
6
7
8
Contrast
7
0x7F (Max)
0x00
Min
0x7F
(Max)
0x7F
(Max)
0x40
(50.4%)
0x7F
(Max)
0x7F
(Max)
0x7F
(Max)
B, R, G
Gain
7
0x7F
(Max)
0x7F
(Max)
0x7F
(Max)
Set V
O to
2 V
P-P
0x7F
(Max)
0x40
(50.4%)
0x00
(Min)
0x7F (Max)
DC Offset
3
0x00 (Min)
0x05
0x07
(Max)
0x05
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 in-
tensity of the OSD relative to the video as follows. If a typical
starting point for the alignment is to have the gains at maxi-
mum (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 rela-
tive to the video. In addition, the OSD contrast register,
0x85C8[5:3], provides 8 major increments of intensity. To-
gether, these allow setting the OSD intensity to the most
pleasing level.
ESD Protection
The LM1276 features a 3.0 kV ESD protection level (see
ry, 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.
www.national.com
8
200969 Version 2 Revision 4
Print Date/Time: 2011/07/11 11:20:12
LM1276
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| LM1279DL WAF | 制造商:Texas Instruments 功能描述: |
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