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CX25870 Datasheet

  • CX25870

  • Conexant Systems, Inc [Video Encoder with Adaptive Flicker ...

  • CONEXANT   CONEXANT

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CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table 1-26. CX25870 SCART Outputs for Different SCART Standards
RGB Standard
European EN50-049 SCART
(1)
connector
CEI IEC 933-1 :
(1)
BBC SCART Arrangement #1
1.0 Functional Description
1.3 Device Description
Red
Pin 15
Pin 15
Green
Pin 11
Pin 11
Blue
Pin 7
Pin 7
Composite/Blanking
Pin 19 -Composite Out
(To Display)
Pin 19 - Composite Out
(To Display)
Y- C Standard
Luminance - Chrominance
(2)
SCART: BBC SCART
Arrangement #2
NOTE(S):
(1)
(2)
Chroma
Pin 15
x
c
Luma
Pin 20
x
鈥?/div>
Red/Green/Blue signals levels are from 0 V + 0.7 V peak-to-peak with 75
鈩?/div>
load impedance.
The Luminance 鈥?Chrominance Outputs for SCART are equivalent to PAL-BDGHI S-Video. Therefore, OUTMODE[1:0] should
be programmed to 00, the EN_SCART bit should be reset to 0, and the OUTMUXA/B/C/D[1:0] bits adjusted according to
which DACs must transmit Luminance(Video[1]) and Chrominance(Video[2]).
A specialized cable and connector are required to connect the CX25870鈥檚
RGB/CVBS or Y/C outputs to the TV鈥檚 SCART input. This cable can be procured
from various European electronic stores and comes in at least two different
arrangements. Consult the CEI IEC 933-1 specification (Audio,
Video, and
Audiovisual systems-Interconnections and Matching Values)
for a precise
illustration of their 21-contact SCART connector, video signal peak-peak values,
and cordset types.
The most common types of SCART connectors are the so-called Type I and
Type II variety.
Figures 1-34
and
1-35
illustrate the recommended Type I and
Type II SCART connector pinout arrangements.
Figure 1-34. CX25870 Driving a Type I SCART Connector (EN 50-049 and IEC 933-1 Compliant)
3.3 V
CVBS as Sync
75
鈩?/div>
1%
CX25870/871
Y/R
C/G
CVBS/B
Std Def
LPF
Std Def
LPF
Std Def
LPF
3.3 V
Std Def
LPF
21
19
17
15
3.3 V
13
11
3.3 V
9
7
5
3
20
18
16
14
12
10
8
6
4
2
+3.3 V
75
鈩?/div>
1%
75
鈩?/div>
1%
75
鈩?/div>
1%
1
SCART
Connector
100381_092
100381B
Conexant
1-79

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CX25871

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