AD9396KSTZ-100 Analog Devices Inc, AD9396KSTZ-100 Datasheet - Page 16

• Manufacturer Part Number: AD9396KSTZ-100
• Description: IC INTERFACE 100MHZ DVI 100LQFP
• Manufacturer: Analog Devices Inc

Specifications of AD9396KSTZ-100

• Applications: Video
• Interface: Analog, DVI
• Voltage - Supply: 3.15 V ~ 3.47 V
• Package / Case: 100-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD9396
Sync Processing
The inputs of the sync processing section of the AD9396 are
combinations of digital HSYNCs and VSYNCs, analog sync-on-
green, or sync-on-Y signals, and an optional external coast
signal. From these signals, it generates a precise, jitter-free (9%
or less at 95 MHz) clock from its PLL; an odd/even field signal;
HSYNC and VSYNC out signals; a count of HSYNCs per
VSYNC; and a programmable SOG output. The main sync
processing blocks are the sync slicer, sync separator, HSYNC
filter, HSYNC regenerator, VSYNC filter, and coast generator.
The sync slicer extracts the sync signal from the green graphics
or luminance video signal that is connected to the SOGIN input
and outputs a digital composite sync. The sync separator’s task
HSYNC 0
HSYNC 1
VSYNC 0
VSYNC 1
SOGIN 0
SOGIN 1
COAST
1
2
3
4
5
ACTIVITY DETECT
POLARITY DETECT
REGENERATED HSYNC
FILTERED HSYNC
SET POLARITY
AD
AD
AD
AD
1
1
1
1
SLICER
SLICER
SYNC
SYNC
AD9396
PD
PD
AD
AD
PD
PD
2
2
1
1
2
2
FILTER COAST VSYNC
MUX
MUX
MUX
0x12:0
CHANNEL
SELECT
VSYNC
Figure 8. Sync Processing Block Diagram
[0x11:3]
VSYNC FILTER
PROCESSOR
Rev. 0 | Page 16 of 48
SYNC
AND
COAST SELECT
0x12:1
MUX
PLL SYNC FILTER EN
HSYNC
SELECT
MUX
SP SYNC FILTER EN
COAST
0x21:6
is to extract VSYNC from the composite sync signal, which can
come from either the sync slicer or the HSYNC input. The
HSYNC filter is used to eliminate any extraneous pulses from
the HSYNC or SOGIN inputs, outputting a clean, low jitter
signal that is appropriate for mode detection and clock
generation. The HSYNC regenerator is used to re-create a clean,
although not low jitter, HSYNC signal that can be used for
mode detection and counting HSYNCs per VSYNC. The
VSYNC filter is used to eliminate spurious VSYNCs, maintain a
stable timing relationship between the VSYNC and HSYNC
output signals, and generate the odd/even field output. The
coast generator creates a robust coast signal that allows the PLL
to maintain its frequency in the absence of HSYNC pulses.
0x21:7
[0x11:7]
MUX
HSYNC
GENERATOR
PLL CLOCK
MUX
FH
4
REGENERATOR
HSYNC FILTER
AND
HSYNC/VSYNC
REG 26H, 27H
COUNTER
SOGOUT SELECT
RH
FILTERED
0x24:2,1
VSYNC
3
MUX
VSYNC
VSYNC FILTER EN
SP
SP
5
5
0x21:5
SP
MUX
SP
5
5
SOG OUT
VSYNC OUT
O/E
FIELD
HSYNC OUT
DATACK