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參數(shù)資料
| 型號： | MAX7445EUD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | 4-Channel Video Reconstruction Filter |
| 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)： | 5/8頁 |
| 文件大?。?/td> | 249K |
| 代理商： | MAX7445EUD |
M
4-Channel Video Reconstruction Filter
_______________________________________________________________________________________
5
Detailed Description
The MAX7445 filters and buffers video-encoder DAC
outputs in applications such as set-top boxes, hard-
disk recorders, DVD players, and digital VCRs. The
MAX7445 reconstructs and cleans up analog video sig-
nals 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.
This device operates from a single +5V supply and has
a nominal cutoff frequency of 5MHz optimized for
NTSC, PAL, and SDTV.
The MAX7445 has three modes of operation allowing
different video signals to be processed. The modes are
shown in Table 1. Mode 1 requires that channel A is a
video signal that includes a sync pulse. A sync separa-
tor uses this signal to extract the timing required to
clamp all four channels.
Modes 2 and 3 require that channel A and channel D
have a sync pulse to provide the required timing informa-
tion. Channel A provides the required timing for channels
A, B, and C while channel D provides its own sync sepa-
rator to extract the sync signal from an asynchronous
video signal.
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
).
MODE
SELECT
CHANNEL
A
B
C
D
A
B
C
D
A
B
C
D
SIGNAL
CVBS
R
G
B
CVBS
Y
C
CVBS
ASYNC
G (with sync)
R
B
CVBS
ASYNC
MODE 1
CVBS/RGB
GND
MODE 2
CVBS/Y/C/
CVBS
ASYNC
V
CC
MODE 3
RGB/CVBS
ASYNC
(G with sync)
FLOATING
PIN
1
2
3
4
NAME
INA
INB
INC
IND
FUNCTION
Channel A Video Input. AC-couple INA with a series 0.1μF capacitor.
Channel B Video Input. AC-couple INB with a series 0.1μF capacitor.
Channel C Video Input. AC-couple INC with a series 0.1μF capacitor.
Channel D Video Input. 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 output buffers and puts them in a high-impedance state.
6, 8
GND
Ground
7
GAIN
Gain-Control Input. Connect GAIN to GND for a gain of +6dB (+2V/V), to V
CC
for a gain of +9.5dB (+3V/V),
or leave unconnected for a gain of +12dB (+4V/V).
9
SELECT
Mode Select Input. Connect to GND for CVBS/RGB processing, to V
CC
for CVBS/Y/C/CVBS
ASYNC
processing, or leave floating for RGB/CVBS
ASYNC
(G with sync) processing.
+5V Supply Input
Channel D Video Output. This output can be either AC- or DC-coupled.
Channel C Video Output. This output can be either AC- or DC-coupled.
Channel B Video Output. This output can be either AC- or DC-coupled.
Channel A Video Output. This output can be either AC- or DC-coupled.
10
11
12
13
14
V
CC
OUTD
OUTC
OUTB
OUTA
Pin Description
Table 1. Operating Modes
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX7446 | 4-Channel Video Filter for RGB and CVBS Video |
| MAX7446EUD | 4-Channel Video Filter for RGB and CVBS Video |
| MAX7448 | 4-Channel RGB Video Filter with Asynchronous CVBS Input |
| MAX7448EUD | 4-Channel RGB Video Filter with Asynchronous CVBS Input |
| MAX7449 | 3-Channel Video Reconstruction Filter for RGB Component Video |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7445EUD+ | 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 |
| MAX7445EUD+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 |
| MAX7445EUD-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 |
| MAX7445EVKIT | 功能描述:有源濾波器 Programmers, Development Systems 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 |
| MAX7446EUD | 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 |
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