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參數(shù)資料
| 型號： | MAX7448EUD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 4-Channel RGB Video Filter with Asynchronous CVBS Input |
| 中文描述： | QUAD CONTINUOUS TIME FILTER, BUTTERWORTH, LOWPASS, PDSO14 |
| 封裝： | 4.40 MM, MO-153, TSSOP-14 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 211K |
| 代理商： | MAX7448EUD |
M
4-Channel RGB Video Filter with
Asynchronous CVBS Input
_______________________________________________________________________________________
5
Detailed Description
The MAX7448 filters and buffers video-encoder DAC
outputs in applications such as set-top boxes, HDRs,
DVD players, and digital VCRs. The MAX7448 recon-
structs and cleans up analog video signals from the
output of DAC video encoders. Each channel consists
of a lowpass filter and an output video buffer that can
drive two standard 150
video loads.
The MAX7448 is designed to process R, G (with sync),
B, and CVBS
ASYNC
video signals. The video signal
processed by channel A (G video signal) requires a
sync pulse. This sync pulse provides the required tim-
ing for channels A, B, and C. Channel D allows an
asynchronous video signal to be processed with its
own local sync separator.
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 video-encoder DAC sampling frequency of 27MHz
(see the
Typical Operating Characteristics
).
High-Frequency Boost
The +1.2dB high-frequency boost on channel D (CVBS
video signal) increases image sharpness by compensat-
ing for signal degradation and rolloff in the video encoder.
Channels A, B, and C do not boost high-frequency sig-
nals and have a flat response over the video bandwidth.
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
MAX7448 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.
PIN
NAME
FUNCTION
1
INA
Channel A Video Input. Use channel A for the green (G with sync) video signal. AC-couple INA with a series
0.1μF capacitor.
2
INB
Channel B Video Input. Use channel B for the red (R) video signal. AC-couple INB with a series 0.1μF
capacitor.
3
INC
Channel C Video Input. Use channel C for the blue (B) video signal. AC-couple INC with a series 0.1μF
capacitor.
4
IND
Channel D Video Input. Use channel D for a CVBS (with sync) signal. AC-couple IND with a series 0.1μF
capacitor.
5
DISABLE
Disable Logic Input. A logic-low on DISABLE enables the output buffers. A logic-high on DISABLE disables
all buffer outputs and puts them in a high-impedance state.
6
–
9
10
11
12
GND
V
CC
OUTD
OUTC
Ground
+5V Supply Input
Channel D Buffer Output. This output can be either AC- or DC-coupled.
Channel C Buffer Output. This output can be either AC- or DC-coupled.
Pin Description
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7448EUD+ | 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 |
| MAX7448EUD+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 |
| MAX7448EUD-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 |
| 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 |
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