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參數(shù)資料
| 型號： | HMP8116CN |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | NTSC/PAL Video Decoder |
| 中文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 文件頁數(shù)： | 5/43頁 |
| 文件大?。?/td> | 182K |
| 代理商： | HMP8116CN |
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5
Introduction
The HMP8116 is designed to decode baseband composite
or S-video NTSC and PAL signals, and convert them to
either digital YCbCr or RGB data. In addition to performing
the basic decoding operations, the HMP8116 includes hard-
ware to decode different types of VBI data and to generate
digital video patterns for a blue screen, black screen and full
screen color bars.
The digital PLLs are designed to synchronize to all NTSC
and PAL standards. A chroma PLL is used to maintain
chroma lock for demodulation of the color information; a line-
locked PLL is used to maintain vertical spatial alignment.
The PLLs are designed to maintain lock even in the event of
VCR headswitches and multipath noise.
The HMP8116 contains two 8-bit A/D converters and an I
2
C
interface for programming internal registers
External Video Processing
Before a video signal can be digitized the decoder has some
external
processing
considerations
addressed. This section discusses those external aspects of
the HMP8116.
that
need
to
be
ANALOG VIDEO INPUTS
The HMP8116 supports either three composite or two com-
posite and one S-video input.
Three analog video inputs (CVBS 1-3) are used to select
which one of three composite video sources are to be
decoded. To support S-video applications, the Y channel
drives the CVBS 3 analog input, and the C channel drives
the C analog input.
The analog inputs must be AC-coupled to the video signals,
as shown in the Applications section.
ANTI-ALIASING FILTERS
An external anti-alias filter is required to achieve optimum
performance and prevent high frequency components from
being aliased back into the video image.
For the CVBS 1-3 inputs, a single filter is connected between
the YOUT and YIN pins. For the C input, the antialiasing filter
should be connected before the C input. A recommended fil-
ter is shown in Figure 1.
Digitization of Video
Prior to A/D conversion, the video signal is DC restored and
gained to generate known video levels into the digital process-
ing logic. This process is addessed in the “AGC and DC Res-
toration” section. After digitization, sample rate converters and
a comb filter are used to perform color separation and demod-
ulation.
A/D CONVERSION
Video data is sampled at the CLK2 frequency then pro-
cessed by the input sample rate converter. The output levels
of the ADC after AGC and DC restoration processing are:
(M) NTSC
(M, N) PAL
(B, D, G, H, I, N
C
)
PAL
white
black
blank
sync
196
66
56
0
196
59
59
0
AGC AND DC RESTORATION
The AGC amplifier attenuates or amplifies the analog video
signal to ensure that the blank level generates code 56 or 59
depending on the video standard. The difference from the
ideal blank level of 56 or 59 is used to control the amount of
attenuation or gain of the analog video signal.
DC restoration positions the video signal so that the sync tip
generates a code 0. The internal timing windows for AGC
and DC Restoration are show in Figure 3.
INPUT SIGNAL DETECTION
It is assumed there is no video input if a horizontal sync is
not detected for 16 consecutive lines. When no video has
been detected, nominal video timing is generated for the
previously detected or programmed video standard. A
maskable interrupt is included to flag when no video has
been detected (bit 6 of the INTERRUPT MASK register 0F
H
)
allowing for blue/black/color bar output modes to be enabled
if desired. The vertical sync interrupt can be used in deter-
mining when a video signal is present on the currently
selected video mux input. Bit 0 of register 0F
H
is used to
enable vertical sync interrupts.
FIGURE 1. RECOMMENDED ANTI-ALIASING FILTER
R
1
332
R
2
4.02K
C
2
82pF
L
1
8.2uH
C
1
33pF
YOUT
YIN
FIGURE 2. AGC AND DC RESTORE INTERNAL TIMING
VIDEO INPUT
DC RESTORE
AGC
HMP8116
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| HMP8117CN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 80PQFP,0+70C NTSC/PAL VIDEO DECODER W/MA RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HMP8117CN96 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HMP8117CNZ | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 W/ANNEAL 80PQFP 0+70 DECODER W/MA RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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