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參數(shù)資料
| 型號： | MAX7474EAE+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADAPTV EQ VID OVER UTP 16SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 76 |
| 類型： | 均衡器 |
| 應(yīng)用： | 安全系統(tǒng) |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 管件 |
MAX7474
Adaptive Equalizer for
Video Over Twisted Pair
6
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1, 2, 3,
5, 10, 13
GND
Ground. Connect all GND terminals together.
4, 9
VCC
Power-Supply Input. Connect a +4.75V to +5.25V supply to VCC. Connect both VCC inputs together.
Bypass each VCC input with a 0.1F capacitor to GND as close as possible to the device.
6
LOB
Loss-of-Burst Logic Output. LOB goes high when the output color burst goes below the LOB threshold
(VLOB) for 32 consecutive horizontal lines when the equalizer is at its maximum gain. LOB goes low
when the output color burst exceeds VLOB for 32 consecutive horizontal lines. When LOB is active, the
device enters the fixed equalization mode. LOB is valid only when LOS is low.
7
BPLVL
Back-Porch Level Input. The voltage applied to BPLVL sets the output back-porch voltage level.
8
OUT
Composite Video Output
11
FEQ0
12
FEQ1
Fixed-Cable Equalization inputs. FEQ0 and FEQ1 set the fixed equalization level. See Table 1.
14
INP
Noninverted Video Input. AC-couple video signal with a 0.022F capacitor.
15
INN
Inverted Video Input. AC-couple video signal with a 0.022F capacitor.
16
LOS
Loss-of-Sync Logic Output. LOS goes high when the input sync amplitude goes below the loss-of-sync
threshold (VLOS) for 32 consecutive horizontal lines. LOS is pulled low when the input sync amplitude
exceeds VLOS for 32 consecutive horizontal lines. When LOS is active, the output enters a high-
impedance state.
Detailed Description
The MAX7474 compensates for cable losses that
occur when transmitting a composite video signal over
unshielded twisted-pair cable (see the
Typical
Application Circuit). The device automatically adapts
to cable length by monitoring the sync and color-burst
amplitudes of the color video signal at the output
(OUT) and adjusting the gains accordingly. Video sig-
nals without burst are automatically detected and a
user-selectable fixed equalization is applied to the sig-
nal. The MAX7474 provides full equalization up to
300m of Category 5e cable and greatly improves per-
formance up to 600m.
The MAX7474 accepts differential video input signals in
NTSC or PAL standards. The MAX7474 includes an
output unity-gain video driver and adjustable back-
porch DC level. The device also features LOS and LOB
logic outputs.
Video Input
The MAX7474 accepts a differential video input with a
maximum 2.4VP-P voltage swing. A twisted-pair cable
carries the differential video signal to the positive (INP)
and negative (INN) inputs, which are AC-coupled with
0.022F capacitors. Each input is internally clamped to
a DC level (see the
Input Clamp section).
Input Clamp
The MAX7474 clamps the sync tip of the input signal to
internally set DC levels effectively correcting, on a line-
by-line basis, any shift in the sync-tip level of the input
video signal. The sync-tip of the positive video input
signal (VINP) is clamped to typically 2.0V and the nega-
tive video input signal (VINN) is clamped to typically
3.2V. The input clamp enables capacitive coupling of
the input, permitting a large common-mode DC differ-
ence between the line driver (camera) and the device.
Adaptive Equalizer
The adaptive equalizer in the MAX7474 provides the
appropriate inverse frequency response needed to
compensate for UTP cable loss. The equalizer adjusts
the low-frequency amplitude and chroma amplitude of
the input CVBS signal. The low-frequency component
of the CVBS is adjusted according to the feedback
information obtained from the internal automatic gain-
control (AGC) circuit, which monitors the sync pulse
amplitude of the output signal (see the
Automatic Gain
Control (AGC) section). The chroma gain of the video
signal is adjusted according to the feedback informa-
tion obtained from the internal automatic equalization
control circuit, which monitors the color-burst amplitude
of the output signal (see the
Automatic Equalization
Control (AEQ) section).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7474EAE+ | 功能描述:視頻 IC Adaptive Equalizer f/Vid Over Twist Pr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX7474EAE+T | 功能描述:視頻 IC Adaptive Equalizer f/Vid Over Twist Pr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX7474EVKIT+ | 功能描述:視頻 IC 開發(fā)工具 MAX7474 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評估:LMH1251 工作電源電壓:5 V |
| MAX747CPD | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX747CPD+ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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