Datasheet

f - Frequency - Rad
4
3
2
1
0
1
2
3
4
0
.
0
Magnitude - dB
0.5 1.0
1.5
2.0 2.5 3.0
f - Frequency - Rad
90
80
70
60
50
40
30
20
10
0
0
.
0 0
.
5
1.
0
1.
5
2.
0
2.
5
3
.
0 3
.
5
Magnitude - dB
f - Frequency - Rad
0
1
2
3
4
5
6
7
8
9
0
.
00
Magnitude - dB
0.01
0.008
0.006
0.004
0.002
0
0.002
0.004
0.006
0.008
0.01
0.25 0.50 0.75 1.00 1.25 1.50
THS8200
SLES032D –JUNE 2002–REVISED JUNE 2013 www.ti.com
Figure 4-12 through Figure 4-14 illustrate the frequency and phase responses of the interpolating filters.
The actual response using the finite-word length coefficients present in THS8200 is shown. The same
filter characteristic is used for SDTV/HDTV modes and for both 4:2:2 to 4:4:4 interpolation (2 filters, one
on each of Cb and Cr channels, switched in when a 4:2:2 input mode is selected on DMAN to interpolate
chrominance from 1/2 to 1x pixel clock rate) as well as for 2x video oversampling (3 filters, one on each
DAC channel, switched in when 2x interpolation is activated).
xxx
Figure 4-12. IFIR Frequency Response Figure 4-13. IFIR Pass-Band Frequency Response
Figure 4-14. IFIR Phase Response
Each of the two interpolation stages can be switched in or bypassed:
• Register data_ifir12_bypass controls the 4:2:2 to 4:4:4 filter bank (these filters should be set active
when a 4:2:2 input mode is selected on DMAN).
• Register data_ifir35_bypass controls the 1x to 2x interpolation stage and can be set active for optional
2x interpolation when an input format with pixel clock < 80 MSPS is present.
30 Detailed Functional Description Copyright © 2002–2013, Texas Instruments Incorporated
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