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參數(shù)資料
| 型號： | ISL98002CRZ-140 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 11/28頁 |
| 文件大小： | 0K |
| 描述： | IC VID DIGITIZER 3CHN AFE 72-QFN |
| 標準包裝： | 840 |
| 位數(shù)： | 8 |
| 通道數(shù)： | 3 |
| 功率（瓦特）： | 525mW |
| 電壓 - 電源，模擬： | 3 V ~ 3.6 V |
| 電壓 - 電源，數(shù)字： | 3 V ~ 3.6 V |
| 封裝/外殼： | 72-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 72-QFN（10x10） |
| 包裝： | 托盤 |
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19
FN6535.1
December 7, 2009
SOG
For component YPbPr signals, the sync signal is embedded
on the Y-Channel’s video, which is connected to the green
input, hence the name SOG (Sync on Green). The horizontal
sync information is encoded onto the video input by adding
the sync tip during the blanking interval. The sync tip level is
typically 0.3V below the video black level.
To minimize the loading on the Green channel, the SOG input
for each of the Green channels should be AC-coupled to the
ISL98002 through a series combination of a 10nF capacitor
and a 500
Ω resistor. Inside the ISL98002, a window
comparator compares the SOG signal with an internal 4-bit
programmable threshold level reference ranging from 0mV to
300mV below the minimum sync level. The SOG threshold
level, hysteresis, and low-pass filter is programmed via
register 0x04. If the Sync On Green function is not needed,
the SOGIN pin(s) may be left unconnected.
SYNC Processing
The ISL98002 can process sync signals from 3 different
sources: discrete HSYNC and VSYNC, composite sync on
the HSYNC input, or composite sync from a Sync On Green
(SOG) signal embedded on the Green video input. Due to
the reduced number of pins in the 72 Ld QFN package,
Channel-2 on the ISL98002 only accepts sync input on SOG.
The ISL98002 has SYNC activity detect functions to help the
firmware determine which sync source is available.
Macrovision
The ISL98002 automatically detects the presence of
Macrovision-encoded video. When Macrovision is detected,
it generates a mask signal that is ANDed with the incoming
SOG CSYNC signal to remove the Macrovision before the
HSYNC goes to the PLL. No additional programming is
required to support Macrovision.
If desired (it is never necessary in normal operation), this
function can be disabled by setting the Sync Mask Disable
(register 0x05 bit 6) to a 1.
The mask signal is also applied to the HSYNCOUT signal.
When Sync Mask Disable = 0, any Macrovision present on
the incoming sync will not be visible on HSYNCOUT. If the
application requires the Macrovision pulses to be visible on
HSYNCOUT, set the HSYNCOUT Mask Disable bit (register
0x05 bit 7).
Headswitching from Analog Videotape Signals
Occasionally this AFE may be used to digitize signals
coming from analog videotape sources. The most common
example of this is a Digital VCR (which for best signal quality
would be connected to this AFE with a component YPbPr
FIGURE 6. SYNC FLOW
HSYNCIN
HSYNC1
SLICER
0X03[2:0]
VSYNCIN
SOGIN
HSYNCIN
VSYNCIN
ACTIVITY 0X01[6:0]
AND
POLARITY 0X02[5:0]
DETECT
SYNC
SPLITTER
PLL
0X0E THROUGH 0X13
HSYNCOUT
VSYNCOUT
COAST
GENERATION
0X11, 0X12,
0X13[2]
XTALIN
XTALOUT
0: ÷1
0X13
[6]
1: ÷2
÷2
XTALCLOCKOUT
OUTPUT
FORMATTER
0X18,
0X19,
0X1A
PIXEL
DATA FROM
AFE
24
R[7:0]
G[7:0]
B[7:0]
DATACLK
HSOUT
SOGIN
SOG
SLICER
0X1C
00, 10,
11:
HSYNCIN
0X05[4:3
]
01:
SOGIN
1:
SYNC
SPLTR
0X05[3]
0:
VSYNCIN
CLOCKINVIN
HS
PIXCLK
CSYNC
SOURCE
SYNC
TYPE
VSYNC
DATACLK
ISL98002
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