參數(shù)資料
型號(hào)： ML6460
廠商： Fairchild Semiconductor Corporation
英文描述： CCIR656 NTSC Video Encoder(CCIR656標(biāo)準(zhǔn)NTSC視頻編碼器)
中文描述： CCIR656 NTSC視頻編碼器（CCIR656標(biāo)準(zhǔn)NTSC制式視頻編碼器）
文件頁(yè)數(shù)： 6/30頁(yè)
文件大?。?/td> 217K
代理商： ML6460
ML6460
6
REV. 1.0 10/25/2000
FUNCTIONAL DESCRIPTION
INTRODUCTION
The ML6460 is a single-chip NTSC video encoder for
generating analog composite (CV) and S-video (Y/C)
outputs from YCrCb digital inputs. The ML6460 is a mixed
signal processor optimizing SNR and distortion by
performing subcarrier generation, sync generation,
modulation and upsampling in the digital domain, while
performing mixing, reconstruction and gain scaling in the
analog domain. In particular, the Y channel requires no
digital scaling, eliminating the need for higher precision
digital solutions. All timing is based on an external clock
source either 27MHz for CCIR656 clock rate or
24.54MHz for square pixel clock rate.
Additionally, the ML6460 allows the inclusion of Closed
Captioning codes in the vertical blanking interval (VBI).
Both lines 21 and 284 support Closed Captioning. The
ML6460 also incorporates Macrovision
copy protection
technology.
Table 1. Video Encoder Functional Selection
Table 2: Video Standards and Clock Rates
DEVICE
FUNCTIONAL DESCRIPTION
Clock
Rates
Video Formats
DAC
Closed
Caption
Encoder
Macrovision
Reconstruction
Filter
75
Cable
Driver
NTSC
PAL
CCIR656
Square
Pixel
Yes
ML6460
Yes. Input: 8-Bit
YCrCb digital
Outputs: Y, C,
and CV analog
Yes. Input: 8-Bit
YCrCb digital
Outputs: Y, C,
and CV analog
No
Yes
Yes.
10-bit
DAC
Yes
Yes
Yes. 7th-order
Butterworth, with
group delay
equalization
Yes. 7th-order
Butterworth, with
group delay
equalization
Yes.
ML6461
No
Yes
Yes
Yes.
10-bit
DAC
Yes
No
Yes.
HORIZONTAL
LINES PER FRAME
525
525
PIXELS PER
HORIZONTAL LINE
858
780
INPUT
CLOCK RATE
27 MHz
24.54 MHz
NTSC CCIR656
NTSC Square Pixel
Other special functions include: programmable polarity
and relative position of sync pulses, master and slave
modes of which includes the ability to handle ITU-R656-
compliant digital TV or ITU-R/SMPTE specifications,
chroma subcarrier phase and frequency adjustments from
external source; Japanese NTSC support; 100% color bars
processing; and internal 7
th
order reconstruction filters
with group delay equalization and 6dB line drivers for
direct TV output.
The ML6460 can be programmed and controlled via a
two-wire serial bus or preset modes. A summary of the
features of the ML6460 are listed in Table 1.
VIDEO STANDARDS SUPPORTED
The ML6460 supports NTSC only. The video standards and
clock rates are listed in Table 2.
Table 3: Pin Assignments for Various Master/Slave Modes
MODE
VSYNC PIN
OUT
IN
OUT
HSYNC PIN
OUT
IN
OUT
FIELD PIN
IN/OUT
IN/OUT
IN/OUT
Master Mode
External Slave Mode
Internal Slave Mode (SAV/EAV CCIR656)
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