bt865a Conexant Systems, Inc., bt865a Datasheet - Page 40

• Manufacturer Part Number: bt865a
• Description: Ycrcb To Ntsc/pal Digital Video Encoder
• Manufacturer: Conexant Systems, Inc.

Circuit Description
1.15
1.15.1
1.15.2
1.15.3
1.15.4
1-30
Analog Outputs
Luminance or CVBS (Y/CVBS) Output
Chrominance or Red (C/R) Output
Composite Video or Blue (CVBS/B) Output
Composite Video or Green (CVBS/G) Output
All digital-to-analog converters are designed to drive standard video levels into a
combined RLOAD of 37.5 Ω. Unused outputs should be connected directly to ground
to minimize supply switching currents. In standard mode, one S-Video (Y/C), and two
composite video outputs are available. In RGBOUT mode, one composite video
output along with analog RGB are available (see
or DACOFF = 1, the DACs are essentially turned off and only the leakage current is
present. The D/A converter values for 100% saturation, 100% amplitude color bars
are shown in
(to provide support for SCART/PeriTV) may be generated simultaneously.
Table 1-7. DAC Output Cross-Reference
Digital luminance information drives the 10-bit D/A converter that generates the
analog Y video output
also provide CVBS for SCART/PeriTV synchronization when RGBOUT is enabled.
Digital chrominance information drives the 10-bit D/A converter that generates the
analog C video output
can also provide Red for SCART/PeriTV when RGBOUT is enabled.
Digital composite video information drives the 10-bit D/A converter that generates
the analog NTSC or PAL video output
1-13). This DAC can also provide Blue for SCART/PeriTV when RGBOUT is
enabled. An optional luminance delay can be enabled on this pin (in standard mode
only) by setting the LUMADLY bits. The luma can be delayed 0 to 3 pixels (up to
200–245 ns) to compensate for group delays introduced in the chroma path by
external filters or vestigial sideband processing.
Digital composite video information drives the 10-bit D/A converter that generates
the analog video output
PeriTV when RGBOUT mode is enabled.
CVBS/B
CVBS/G
C/R
Y/CVBS
DAC Name
Figures 1-22
(Figures 1-22
(Figures 1-24
Signal
Conexant
(Table
10
12
13
8
through 1-27. Both composite video and analog RGB video
Pin Number
1-14). This DAC can also provide Green for SCART/
and
and
(Figures 1-26
AGND
1-23
1-25
11
6
7
9
and
and
Table
Tables 1-8
Tables 1-10
and
1-7). If the SLEEP pin is high
Std Mode
1-27
CVBS
CVBS
C
Y
and 1-9). This DAC can
and
and 1-11). This DAC
Pin Function
Bt864A/Bt865A Data Sheet
Tables 1-12
RGB Out Mode
CVBS
G
R
B
and
100138C
02/17/03