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參數(shù)資料
| 型號(hào)： | MAX7444ETA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTER RECON VID 8-TDFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 濾波器類(lèi)型： | 低通 |
| 頻率 - 截止或中心： | 27MHz |
| 濾波器數(shù)： | 2 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-WDFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 8-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
MAX7443/MAX7444
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
4
_______________________________________________________________________________________
65
70
80
75
85
90
-40
10
-15
35
60
85
SUPPLY CURRENT
vs. TEMPERATURE
MAX7443/44
toc07
TEMPERATURE (°C)
SUPPLY
CURRENT
(mA)
DIFFERENTIAL GAIN
MAX7443/44
toc08
DIFFERENTIAL
PHASE
(DEGREES)
13
24
5
6
7
13
24
5
6
7
0.2
0.3
0.1
0
-0.1
-0.2
-0.3
DIFFERENTIAL
GAIN
(%)
0.2
0.3
0.1
0
-0.1
-0.2
-0.3
DIFFERENTIAL PHASE
MULTIBURST RESPONSE
MAX7443/44
toc09
YIN
200mV/div
YOUT
200mV/div
10s/div
Typical Operating Characteristics (continued)
(VCC = +5V, TA = +25°C, unless otherwise noted.)
Detailed Description
The primary function of the MAX7443/MAX7444 is to fil-
ter and buffer the encoder DAC outputs that contain
digital video information in applications such as set-top
boxes, hard-disk recorders, DVD players, and digital
VCRs. These devices reconstruct and clean up analog
video signals. Each MAX7443/MAX7444 consists of a
lowpass filter and an adjustable-gain output video
buffer that is capable of driving two standard 150
video loads. The luma (YIN) and chroma (CIN) video
inputs are summed internally to provide the composite
(CVOUT) video output.
These devices operate from a single +5V supply. The
filters have a nominal cutoff frequency optimized for
NTSC, PAL, and SDTV.
Filter
Filter Response
The reconstruction filter consists of two 2nd-order
Sallen-Key stages. The Butterworth-type response fea-
tures a maximally flat passband for NTSC and PAL
bandwidths. The stopband offers 41dB (typ) of attenua-
tion at sampling frequencies of 27MHz and above (see
Typical Operating Characteristics).
High-Frequency Boost
The high-frequency boost available in the MAX7444
compensates for signal degradation and rolloff in the
video encoder, which increases the image sharpness.
The MAX7443 has a flat response over the video band-
width.
Output Buffer
The output buffer drives two 150 video loads with a
2VP-P signal. The adjustable gain of the output buffer
provides a gain of 6dB, 9.5dB, and 12dB, which are
selected by tying the GSET pin to GND, VCC, or float-
ing, respectively. The MAX7443/MAX7444 can drive an
AC load or drive the video load directly without using
the large output capacitor. The output buffer drives a
DC load with an output blanking level of less than 1V.
PIN
NAME
FUNCTION
1
YIN
Luma (Y) Input
2
GSET
Gain-Setting Control Input. See Table 1
for values.
3
CIN
Chroma (C) Input
4
GND
Ground
5VCC
5V Power Supply
6
COUT
Chroma (C) Output
7
CVOUT
Composite Video Output
8
YOUT
Luma (Y) Output
Pin Description
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| MAX7445EUD | 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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| 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 |
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