參數(shù)資料
型號(hào)： AD9985AKSTZ-140
廠商： ANALOG DEVICES INC
元件分類： 其它接口
英文描述： 110 MSPS/140 MSPS Analog Interface for Flat Panel Displays
中文描述： SPECIALTY INTERFACE CIRCUIT, PQFP80
封裝： LEAD FREE, MS-026-BEC, PLASTIC, LQFP-80
文件頁(yè)數(shù)： 28/32頁(yè)
文件大?。?/td> 344K
代理商： AD9985AKSTZ-140
AD9985A
Table 46. Control of the Sync Block Muxes via the Serial Register
Mux No.
Serial Bus Control Bit
1 and 2
0x0E: Bit 3
3
0x0F: Bit 5
4
0x0E: Bit 0
Rev. 0 | Page 28 of 32
Control Bit State
0
1
0
1
0
1
Result
Pass Hsync
Pass sync-on-green
Pass Coast
Pass Vsync
Pass Vsync
Pass sync separator signal
SYNC SLICER
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.
First, the SOG input is clamped to its negative peak (typically,
0.3 V below the black level). Next, the signal goes to a compara-
tor with a variable trigger level, nominally 0.15 V above the
clamped level. The sliced sync 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 AD9985A is simply 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 basic idea is that the counter counts
up when Hsync pulses are present. But since Hsync pulses are
relatively short in width, the counter only reaches 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 μs width Hsync, the
counter only reaches 5 (1 μs/200 ns = 5). Now, when Vsync is
present on the composite sync, the counter also counts up.
However, since 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 a value higher than N.
The specific count that triggers detection (T) can be
programmed through the serial register (0x11).
Once Vsync has been detected, there is a similar process to
detect when it goes inactive. At detection, the counter first
resets to 0, then starts counting up when Vsync goes away.
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 detected to
be absent, the counter resets to 0 and begins the cycle again.
相關(guān)PDF資料
PDF描述
AD9985BSTZ-110 110 MSPS/140 MSPS Analog Interface for Flat Panel Displays
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9985BST-110 制造商:Analog Devices 功能描述:110 MSPS/140 MSPS ANLG INTRFC FOR FLAT PNL DISPLAYS 80LQFP - Bulk
AD9985BSTZ-110 功能描述:IC INTERFACE 8BIT 110MSPS 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1
AD9985KST-110 制造商:Analog Devices 功能描述:110 MSPS/140 MSPS ANLG INTRFC FOR FLAT PNL DISPLAYS 80LQFP - Bulk
AD9985KSTZ-110 功能描述:IC INTERFACE 8BIT 110MSPS 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1
AD9985KSTZ-140 功能描述:IC INTERFACE 8BIT 140MSPS 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2
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