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MAX7443 データシート(PDF) 4 Page - Maxim Integrated Products

部品番号 MAX7443
部品情報  Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
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メーカー  MAXIM [Maxim Integrated Products]
ホームページ  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX7443 データシート(HTML) 4 Page - Maxim Integrated Products

  MAX7443 Datasheet HTML 1Page - Maxim Integrated Products MAX7443 Datasheet HTML 2Page - Maxim Integrated Products MAX7443 Datasheet HTML 3Page - Maxim Integrated Products MAX7443 Datasheet HTML 4Page - Maxim Integrated Products MAX7443 Datasheet HTML 5Page - Maxim Integrated Products MAX7443 Datasheet HTML 6Page - Maxim Integrated Products MAX7443 Datasheet HTML 7Page - Maxim Integrated Products MAX7443 Datasheet HTML 8Page - Maxim Integrated Products  
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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
TEMPERATURE (
°C)
DIFFERENTIAL GAIN
13
24
5
6
7
13
24
5
6
7
0.2
0.3
0.1
0
-0.1
-0.2
-0.3
0.2
0.3
0.1
0
-0.1
-0.2
-0.3
DIFFERENTIAL PHASE
MULTIBURST RESPONSE
YIN
200mV/div
YOUT
200mV/div
10
µs/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
Ω 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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