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| 型号： | AD9882AKSTZ-100 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 29/40页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE/DVI 100MHZ 100LQFP |
| 标准包装： | 1 |
| 应用： | 视频 |
| 接口： | 模拟，DVI |
| 电源电压： | 3.15 V ~ 3.45 V |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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AD9882A
Rev. 0 | Page 35 of 40
SYNC PROCESSING ENGINE
SYNC SLICER
This section describes the basic operation of the sync
processing engine (see Figure 20).
The purpose of the sync slicer is to extract the sync signal from
the green graphics channel. A sync signal is not present on all
graphics systems (only those with sync-on-green). The sync
signal is extracted from the green channel in a two-step process.
1.
SOG input is clamped to its negative peak (typically 0.3 V
below the black level).
2.
The signal goes to a comparator with a variable trigger
level, nominally 0.15 V above the clamped level. The
output signal is typically a composite sync signal
containing both Hsync and Vsync.
SYNC SEPARATOR
A sync separator extracts the Vsync signal from a composite
sync signal. It does this through a low-pass filter-like or
integrator-like operation. It works on the idea that the Vsync
signal stays active for a much longer time than the Hsync signal.
So, it rejects any signal shorter than a threshold value, which is
somewhere between an Hsync pulse width and a Vsync pulse
width.
The sync separator on the AD9882A is an 8-bit digital counter
with a 5 MHz clock. It works independently of the polarity of
the composite sync signal. Polarities are determined elsewhere
on the chip. The counter counts up when Hsync pulses are
present. But since Hsync pulses are relatively short in width, the
counter reaches only a value of N before the pulse ends. It then
starts counting down, eventually reaching 0 before the next
Hsync pulse arrives. The specific value of N varies for different
video modes, but is always less than 255. For example, with a
1 ms width Hsync, the counter only reaches 5 (1 s/200 ns = 5).
When Vsync is present on the composite sync, the counter also
counts up. However, because the Vsync signal is much longer, it
counts to a higher number, M. For most video modes, M is at
least 255. So, Vsync can be detected on the composite sync
signal by detecting when the counter counts to higher than N.
The specific count that triggers detection (t) can be program-
med through the serial register (0x0E).
Once Vsync has been detected, a similar process detects when it
goes inactive. At detection, the counter first resets to 0, then
starts counting up when Vsync goes away. In a way similar to
the previous case, it detects the absence of Vsync when the
counter reaches the threshold count (T). In this way, it rejects
noise and/or serration pulses. Once Vsync is determined to be
absent, the counter resets to 0 and begins the cycle again.
05123-020
SOG
HSYNC IN
HSYNC OUT
PIXEL CLOCK
HSYNC OUT
PLL
AD9882A
CLOCK
GENERATOR
VSYNC IN
ACTIVITY
DETECT
ACTIVITY
DETECT
SYNC STRIPPER
COMP
SYNC
NEGATIVE
PEAK
CLAMP
SYNC SEPARATOR
INTEGRATOR
VSYNC
1/S
ACTIVITY
DETECT
MUX 2
MUX 1
MUX 4
MUX 5
MUX 3
POLARITY
DETECT
POLARITY
DETECT
HSYNC
COAST
SOG OUT
VSYNC OUT
DE
MUX 6
HSYNC
VSYNC
DE
DVI
Figure 20. Sync Processing Block Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9882AKSTZ-140 | 功能描述:IC INTERFACE/DVI 100MHZ 100LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| AD9882KS-140 | 制造商:Analog Devices 功能描述:LOW COST DUAL INTERFACE - Bulk |
| AD9882KST-100 | 制造商:Rochester Electronics LLC 功能描述:LOW COST DUAL INTERFACE - Bulk |
| AD9882KST-140 | 制造商:Analog Devices 功能描述:Interface for Flat Panel Display 100-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:LOW COST DUAL INTERFACE - Bulk 制造商:Analog Devices 功能描述:IC DUAL INTERFACE |
| AD9882KSTZ-100 | 功能描述:IC INTERFACE/DVI 100MHZ 100LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
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