ISL98002CRZ-170 Intersil, ISL98002CRZ-170 Datasheet - Page 19

• Manufacturer Part Number: ISL98002CRZ-170
• Description: IC VID DIGITIZER 3CHN AFE 72-QFN
• Manufacturer: Intersil

Specifications of ISL98002CRZ-170

• Number Of Bits: 8
• Number Of Channels: 3
• Power (watts): 535mW
• Voltage - Supply, Analog: 3 V ~ 3.6 V
• Voltage - Supply, Digital: 3 V ~ 3.6 V
• Package / Case: 72-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 500Ω 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 SOG
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.
CLOCKINV
HSYNC
VSYNC
XTAL
XTAL
SOG
IN
OUT
IN
IN
IN
IN
IN
pin(s) may be left unconnected.
0X03[2:0]
HSYNC1
SLICER
SLICER
0X1C
SOG
19
POLARITY 0X02[5:0]
ACTIVITY 0X01[6:0]
÷2
DETECT
AND
0X13
0: ÷1
1: ÷2
[6]
FIGURE 6. SYNC FLOW
VSYNC
HSYNC
SOG
0X0E THROUGH 0X13
GENERATION
0X11, 0X12,
ISL98002
IN
COAST
0X13[2]
IN
IN
PLL
SOURCE
HSYNC
0X05[4:3
CSYNC
00, 10,
SOG
11:
01:
]
IN
IN
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 HSYNC
When Sync Mask Disable = 0, any Macrovision present on
the incoming sync will not be visible on HSYNC
application requires the Macrovision pulses to be visible on
HSYNC
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
DATA FROM
OUT
HS
PIXCLK
PIXEL
AFE
SPLITTER
SYNC
, set the HSYNC
24
VSYNC
VSYNC
FORMATTER
0X05[3]
SYNC
SPLTR
TYPE
SYNC
OUTPUT
OUT
1:
0:
0X18,
0X19,
0X1A
IN
Mask Disable bit (register
XTALCLOCK
OUT
OUT
VSYNC
HSYNC
DATACLK
DATACLK
March 26, 2008
signal.
. If the
R[7:0]
G[7:0]
B[7:0]
HS
FN6535.0
OUT
OUT
OUT
OUT