cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 46
![no-image](/images/manufacturer_photos/0/1/156/conexant_systems__inc__sml.jpg)
cx25870
Manufacturer Part Number
cx25870
Description
Video Encoder With Adaptive Flicker Filtering And Hdtv Output
Manufacturer
Conexant Systems, Inc.
Datasheet
1.CX25870.pdf
(291 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
cx25870-14P
Manufacturer:
CONEXANT
Quantity:
20 000
- Current page: 46 of 291
- Download datasheet (3Mb)
1.0 Functional Description
1.3 Device Description
1.3.13 RGB Inputs (For Standard TV Outputs)
1.3.14 Input Pixel Horizontal Sync
1-30
With IN_MODE[3:0] set to a RGB mode, the encoder must receive digital
gamma-corrected RGB data as an input. If this occurs, the RGB data will be
converted to Y/R-Y/B-Y as follows:
Y[9:0] = [INT(0.299
2
0 % Y[9:0] %#1024
justified to eight bit numbers.
data prior to overscan compensation and flicker filtering.
scaled for the output range of the DACs. The MY, MCR, and MCB registers must
be programmed to perform this conversion. The scaling equations are:
MY = (int)[V
MCR = (int)[(128.0/127.0)
MCB = (int)[(128.0/127.0)
where:V
V
F
F
Sinx = Sin [(2$#F
The HSYNC* pin provides line synchronization for the pixel input data. It is an
output in master interface and an input in slave and pseudo-master interface. In
the master interface, it is a pulse two CLKI cycles in duration whose leading edge
indicates the beginning of a new line of pixel data. The period between two
consecutive HSYNC* pulses is H_CLKI CLK cycles. The first active pixel
should be presented to the device H_BLANKI minus the internal pipelined clock
(5 CLK cycles) after the leading edge of HSYNC*. The next H_ACTIVE pixels
are accepted as active pixels and used in the construction of the output video. In
the slave interface the exact number of clocks per line (H_CLKI) must be
provided as calculated for the desired overscan ratio. Only the leading edge of
HSYNC* is used, low times must be at least two CLKI cycles in duration.
HSYNC* is clocked into the encoder by the rising edge of CLKI.
The default convention is active low.
10
sc
FS
clk
)
For 15 and 16 bit RGB input formats, individual R, G, and B values are left
After the initial conversion, the Y/R-Y/B-Y values are sub-sampled to 4:2:2
The resulting 4:2:2 output must then be converted to YUV values and then
For SECAM formulas see the SECAM section.
The polarity of the HSYNC* signal is changed by the HSYNCI register bit.
= color subcarrier frequency (see
= Full scale output voltage (1.28 V)
= CLKI input frequency
*
B[7:0] + 2
100
= 100% white voltage (0.661 V for NTSC, 0.7 V for PAL)
100
/(255
7
SC
]
Conexant
*
/F
*
2
*
CLK
-8
2
V
10
FS
)/(2$#F
)
)
*
*
*
Flicker-Free Video Encoder with Ultrascale Technology
*
2
V
V
R[7:0]} + INT(0.587
6
100 *
100 *
+ 0.5]
SC
/F
0.877/(127
0.493/(127
Table
CLK
)]
A-2)
*
*
V
V
FS *
FS *
*
2
10
sinx)
sinx)
*
G[7:0] + INT(0.114
*
*
2
2
5
5
CX25870/871
+ 0.5]
+ 0.5]
100381B
*
Related parts for cx25870
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![PH2402](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Bluetooth RF Transceiver
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![PH2401](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Bluetooth RF Transceiver
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![BT8222EPFE](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
ATM transmitter/receiver with UTOPIA interface
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![CN8330EPJD](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Service SAR controller
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![CN8223EPF](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
CN8223EPFATM Transmitter/Receiver with UTOPIA Interface
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![RC224ATL](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Embedded modem family
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![BT8370KPF](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Fully integrated T1/E1 framer and line interface
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![BT869KRF](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Flicker-free video encoder
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![CX82100-41](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Home Networking Physical Layer Device with Integrated Analog Front End Circuitry Data Sheet (Preliminary) CX82100-41Home Network Processor (HNP)
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![R6781-13](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![BT864AKRF](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![CX20493-31](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![BT868KRF](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Flicker-free video encoder
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![CX81801-84](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
SmartV.XX Modem
Manufacturer:
Conexant Systems, Inc.
Datasheet:
![CN8478EPF](/images/manufacturer_photos/0/1/156/conexant_systems__inc__tmb.jpg)
Part Number:
Description:
Multichannel synchronous communications controller
Manufacturer:
Conexant Systems, Inc.
Datasheet: