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參數(shù)資料
| 型號(hào)： | MAX7449 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3-Channel Video Reconstruction Filter for RGB Component Video |
| 中文描述： | 三通道視頻重建濾波器，用于RGB復(fù)合視頻信號(hào) |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 184K |
| 代理商： | MAX7449 |
Detailed Description
The MAX7449 filters and buffers video-encoder DAC
outputs in applications such as set-top boxes, HDRs,
DVD players, and digital VCRs. The MAX7449 recon-
structs and cleans up component RGB analog video
signals. Each channel consists of a lowpass filter and
an output video buffer that drives two standard 150
video loads.
This device operates from a single +5V supply and has
a nominal cutoff frequency of 5MHz optimized for
NTSC, PAL, and SDTV.
Filter
Filter Response
The reconstruction filter consists of two 2nd-order Sallen-
Key stages. The Butterworth-type response features a
maximally flat passband for NTSC and PAL bandwidths.
The stopband offers at least 43dB (typ) of attenuation at
a sampling frequency of
≥
27MHz (see the
Typical
Operating Characteristics
).
Output Buffers
Each output buffer has a fixed gain of +6dB and can
drive two 150
video loads with a 2V
P-P
signal. The
MAX7449 can drive an AC load or drive the video load
directly without using a large output capacitor. The out-
put buffers drive DC loads with an output blanking level
of less than 1V.
Output Clamp Level
When a sync pulse is detected on EXTSYNC, the DC
restore loop is activated for channels A, B, and C. The
function of the loop is to set the DC level of the video
signal to the desired level. See Table 1 for clamp levels.
Applications Information
Input Considerations
Use 0.1μF ceramic capacitors to AC-couple the inputs.
These input capacitors store a DC level so the outputs
are clamped to an appropriate DC voltage level. The
MAX7449 allows R, G, or B video signals to be processed
by any channel. G must not have sync information.
Output Considerations
The outputs are typically connected to a 75
series
back-match resistor followed by the video cable.
Because of the inherent divide-by-two of this configura-
tion, the voltage on the video cable is always less than
1V, complying with industry-standard video require-
ments such as the European SCART standard (which
allows up to 2V of DC on the video cable). The video
buffer can also drive an AC-coupled video load. Good
video performance is achieved with an output capacitor
as low as 220μF.
Power-Supply Bypassing and Layout
The MAX7449 operates from a single +5V supply.
Bypass V
CC
to GND with a 0.1μF capacitor. Place all
external components as close to the device as possible.
Exposed Pads
The TSSOP-EP package has an exposed pad on the
bottom of the package. This pad is electrically connect-
ed to GND and should be connected to the ground
plane for improved thermal conductivity. Do not route
signals under this package.
M
3-Channel Video Reconstruction Filter
for RGB Component Video
_______________________________________________________________________________________
5
14
13
12
11
10
9
8
1
2
3
4
5
6
7
N.C.
OUTA
OUTB
OUTC
INC
INB
INA
V
CC
TOP VIEW
MAX7449
V
CC
N.C.
GND
GND
EXTSYNC
DISABLE
TSSOP
Pin Configuration
Chip Information
TRANSISTOR COUNT: 6300
PROCESS: BiCMOS
Table 1. Output Clamp Level
CHANNEL
A
B
C
CLAMP LEVEL (V)
1.5
1.5
1.5
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|---|---|
| MAX7449EUD | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7449EUD+ | 功能描述:有源濾波器 Integrated Circuits (ICs) RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7449EUD+T | 功能描述:有源濾波器 Integrated Circuits (ICs) RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX7449EUD-T | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| MAX744AC/D | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down Current-Mode PWM DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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