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參數資料
| 型號： | LC749870LG |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA64 |
| 封裝： | 5 X 5 MM, FLGA-64 |
| 文件頁數： | 24/44頁 |
| 文件大小： | 538K |
| 代理商： | LC749870LG |
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LC749870LG
No.A1765-30/44
2. AFE and ADC
This IC (LC749870LG) incorporates 1-channel of video AFE and 10-bit 30MHz ADC.
Analog clamp (Self-clamp circuit)
The self clamp circuit clamps the sync-tip without supplying clamp pulses to AFE module. When the self-clamp
function is not used, it can be placed in power down mode using I2C_SELFCLPPWDB.
Sync-tip clamp specifications
Low pass filter before self-clamp
A primary LPF with a 1MHz cutoff frequency has been inserted in the stage before the self-clamp circuit as a measure
to deal with the high-frequency noise that is present in weak electric fields. The LPF function is for minimizing shifts in
the clamp levels of the self-clamp when high-frequency noise components are present in the video signals. The LPF can
be set to ON or OFF using I2C_CLPLPFON.
Fig.1 Self Clamp in Weak Electric Fields
Input video signal(SD)
High frequency noise of
1MHz and above
0V
0.35V
Sync tip clamp
when LPF is OFF
Clamping is performed at the lower limit
level of the noise components. Due to the
effect of the noise, the clamp level shifts.
Clamping is performed at the level at which the
noise components are removed.
It is clamped at its original position.
Sync tip clamp
when LPF is ON
(ADC-input reference)
ADC output code
1023
1
512
147
878
356
* The figures represent the values under ideal conditions.
Clamp settings
Self-clamp setting
SELFCLPPWDB
1: Self-clamp enabled
Main clamp level setting
MAINCLPLVCNT [1:0]
00: Main clamp level
0.35V
1.35V
0.85V
0.65V
1.55V
0.15V
1.4Vp-p range
1.0Vp
Analog input
Digital output
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相關代理商/技術參數 |
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