CX25870/871
1.0 Functional Description
Flicker-Free Video Encoder with Ultrascale Technology
1.3 Device Description
Table 1-26. CX25870 SCART Outputs for Different SCART Standards
RGB Standard
Red
Pin 15
Green
Pin 11
Blue
Pin 7
Composite/Blanking
European EN50-049 SCART (1) connector
Pin 19 -Composite Out
(To Display)
CEI IEC 933-1 : (1) BBC SCART Arrangement #1
Pin 15
Pin 11
Pin 7
Pin 19 - Composite Out
(To Display)
Y- C Standard
Chroma
x
Luma
Pin 20
x
Luminance - Chrominance (2) SCART: BBC SCART
Arrangement #2
Pin 15
c
—
NOTE(S):
(1)
Red/Green/Blue signals levels are from 0 V + 0.7 V peak-to-peak with 75 Ω load impedance.
(2)
The Luminance – 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’s
RGB/CVBS or Y/C outputs to the TV’s 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
Std Def
LPF
CVBS as Sync
75 Ω
1%
21
19
17
20
+3.3 V
18
16
3.3 V
CX25870/871
Y/R
15
13
Std Def
LPF
14
12
10
3.3 V
11
9
Std Def
LPF
C/G
3.3 V
8
6
7
Std Def
LPF
CVBS/B
5
4
2
3
1
75 Ω
1%
75 Ω
1%
75 Ω
1%
SCART
Connector
100381_092
100381B
Conexant
1-79
CONEXANT [ CONEXANT SYSTEMS, INC ]
