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MAX7446 Datasheet(PDF) 4 Page - Maxim Integrated Products

Part No. MAX7446
Description  4-Channel Video Filter for RGB and CVBS Video
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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4-Channel Video Filter for RGB and CVBS Video
4
_______________________________________________________________________________________
Pin Description
Detailed Description
The MAX7446 filters and buffers video-encoder DAC
outputs in applications such as set-top boxes, hard-
disk recorders, DVD players, and digital VCRs. The
MAX7446 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 drives two standard 150
Ω video loads.
The MAX7446 is designed to process CVBS, R, G, and
B video signals. The video signal processed by chan-
nel A (CVBS) must include a sync pulse. This sync
pulse provides the required timing to all four channels.
This device operates from a single +5V supply and has
a nominal cutoff frequency of 5MHz optimized for
NTSC, PAL, and SDTV.
SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (
°C)
60
35
10
-15
90
100
110
120
80
-40
85
INPUTS BIASED TO +2V
NO LOAD
DIFFERENTIAL GAIN
1st
3rd
2nd
4th
5th
6th
1st
3rd
2nd
4th
5th
6th
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
MAX7446 toc09
10
µs/div
250mV/div
250mV/div
IN_
OUT_
Typical Operating Characteristics (continued)
(VCC = +5V, TA = +25°C, unless otherwise noted.)
PIN
NAME
FUNCTION
1
INA
Channel A Video Input. Use channel A for the CVBS video signal. AC-couple INA with a series 0.1µF capacitor.
2
INB
Channel B Video Input. Use channel B for the red (R) signal. AC-couple INB with a series 0.1µF capacitor.
3INC
Channel C Video Input. Use channel C for the green (G) (without sync) signal. AC-couple INC with a series
0.1µF capacitor.
4
IND
Channel D Video Input. Use channel D for the blue (B) 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 output buffers and puts them in a high-impedance state.
6–9
GND
Ground
10
VCC
+5V Supply Input
11
OUTD
Channel D Video Output. This output can be either AC- or DC-coupled.
12
OUTC
Channel C Video Output. This output can be either AC- or DC-coupled.
13
OUTB
Channel B Video Output. This output can be either AC- or DC-coupled.
14
OUTA
Channel A Video Output. This output can be either AC- or DC-coupled.




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