ch7012a Chrontel, ch7012a Datasheet - Page 25

• Manufacturer Part Number: ch7012a
• Description: Ch7012 Tv Output Device
• Manufacturer: Chrontel

CHRONTEL
Bits 1-0 of register VBW control the filter used to limit the bandwidth of the luma signal in the CVBS output signal.
A table of –3dB bandwidth values is given below.
Bits 3-2 of register VBW control the filter used to limit the bandwidth of the luma signal in the S-Video output
signal. A table of –3dB bandwidth values is given below.
Bit 4 of register VBW control the filter used to limit the bandwidth of the chroma signal in the CVBS and S-Video
output signals. A table of –3dB bandwidth values is given in Table 13 below.
Bit 5 of register VBW controls the signal output on the CVBS pin. When this bit is low, the S-Video luminance
signal is output at both the S-Video luminance pin and the CVBS pin. This enables the output of a black and white
image on the composite output, thereby eliminating the degrading effects of the color signal (such as dot crawl and
false colors), which is useful for viewing text with high accuracy. This also allows the output of either S-Video or
CVBS using just two DAC’s. This is useful in situations where connector space is at a premium.
201-0000-042 Rev 2.1, 10/20/2004
Table 13. Video Bandwidth
Mode
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
0.620
0.775
0.529
0.648
0.831
1.060
0.703
0.870
0.738
0.930
0.624
0.773
0.892
0.620
0.775
0.930
0.648
0.740
0.793
0.729
0.833
0.892
0.724
0.886
1.030
0.774
0.945
1.100
0.859
0.942
1.030
0.804
0.919
1.030
0.767
0.862
0.965
0.709
0.466
0
CBW
0.856
1.070
0.730
0.894
1.150
1.470
0.970
1.200
1.020
1.280
0.862
1.070
1.230
0.856
1.070
1.280
0.894
1.020
1.100
1.010
1.150
1.230
0.999
1.220
1.430
1.070
1.310
1.520
1.190
1.300
1.420
1.270
1.430
1.060
1.190
1.330
0.979
0.643
1.110
1
2.300
2.880
1.960
2.410
3.080
3.950
2.610
3.230
2.740
3.460
2.320
2.870
3.310
2.300
2.880
3.460
2.410
2.750
2.950
2.710
3.090
3.310
2.690
3.290
3.840
2.880
3.510
4.100
3.190
3.500
3.830
2.990
3.410
3.840
2.850
3.200
3.580
2.630
1.730
00
2.690
3.360
2.290
2.810
3.600
4.610
3.040
3.770
3.200
4.030
2.710
3.350
3.870
2.690
3.360
4.030
2.810
3.210
3.440
3.160
3.610
3.870
3.140
3.840
4.480
3.360
4.100
4.780
3.720
4.080
4.470
3.480
3.980
4.480
3.320
3.740
4.180
3.070
2.020
01
YSV[1:0] and YCV[1:0]
3.540
4.430
3.020
3.700
4.750
6.080
4.010
4.970
4.220
5.320
3.570
4.420
5.100
3.540
4.430
5.320
3.700
4.230
4.530
4.160
4.760
5.100
4.130
5.060
5.910
4.430
5.400
6.300
4.910
5.380
5.890
4.590
5.250
5.910
4.380
4.930
5.510
4.050
2.660
10
CH7012A
10.100
10.400
5.880
7.350
5.010
6.140
7.870
6.660
8.240
7.000
8.820
5.920
7.330
8.450
5.880
7.350
8.820
6.140
7.010
7.510
6.900
7.890
8.450
6.860
8.400
9.790
7.340
8.960
8.140
8.920
9.770
7.620
8.710
9.790
7.260
8.170
9.140
6.720
4.410
11
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