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PDF MAX7441 Data sheet ( Hoja de datos )
| Número de pieza | MAX7441 | |
| Descripción | (MAX7440 - MAX7442) 6-Channel Integrated Video Reconstruction Filters | |
| Fabricantes | Maxim Integrated Products | |
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19-2750; Rev 0; 1/03
6-Channel Integrated Video Reconstruction
Filters
General Description
The MAX7440/MAX7441/MAX7442 six-channel video
reconstruction filters replace 30 or more discrete com-
ponents. The devices are ideal for digital-to-analog
converter (DAC) video reconstruction applications,
when analog video is reconstructed from a digital data
stream. The MAX7440/MAX7441/MAX7442 operate
from a single +5V power supply. The inputs are DC-
coupled from the DAC and the output can either be AC-
or DC-coupled. The DC-IN, DC-OUT architecture, leads
to a perfect line-time distortion performance (zero tilt).
The filters have a cutoff frequency optimized for PAL,
NTSC, and SDTV video applications and offer three
high-frequency boost options. The MAX7440 offers a
flat passband response on all six channels; the
MAX7441/MAX7442 offer high-frequency boost on the
three channels used for CVBS and Y/C. The MAX7440/
MAX7441/MAX7442 are available in a 14-pin SO pack-
age and are fully specified over the extended tempera-
ture range.
Applications
STB PVR
DVDs
SCART Video Applications
Hard Disk Recorders
General Video Filtering
+5V
Features
o Replace 30 or More Discrete Components
o Ideal for CVBS, Y/C (S-Video), and RGB or Y Pb Pr
Applications
o 45dB Attenuation at 27MHz
o -0.2dB Passband Response
o Ideal for STBs with SCART Interface
o +5V Single-Supply Voltage
o Input Common-Mode Range Includes GND
o DC-Coupled Input, DC/AC-Coupled Output
o 14-Pin SO Package
Ordering Information
PART
MAX7440ESD
TEMP RANGE
PIN-
PACKAGE
-40°C to +85°C 14 SO
HIGH-
FREQUENCY
BOOST
No
MAX7441ESD -40°C to +85°C 14 SO
Yes
MAX7442ESD* -40°C to +85°C 14 SO
Yes
*Future product—contact factory for availability.
Typical Application Circuit
ENCODER
0.1µF
D/A
1µF
IN1
MAX7440
MAX7441
MAX7442
LOWPASS FILTER
WITH HF BOOST*
A = +1V/V
OUT1
A/V SWITCHING
DEVICE (MAX4399)
OR BUFFERS
75Ω
75Ω
IN2
OUT2
75Ω 75Ω
D/A LOWPASS FILTER A = +1V/V
IN3
OUT3
75Ω 75Ω
D/A LOWPASS FILTER A = +1V/V
IN4
OUT4
75Ω 75Ω
D/A LOWPASS FILTER A = +1V/V
D/A
IN5
LOWPASS FILTER
WITH HF BOOST*
A = +1V/V
OUT5
75Ω 75Ω
D/A
IN6
LOWPASS FILTER
WITH HF BOOST*
A = +1V/V
OUT6
75Ω 75Ω
*MAX7440 HAS FLAT RESPONSE, MAX7441/MAX7442 INCLUDES HF BOOST.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
6-Channel Integrated Video Reconstruction
Filters
Pin Description
PIN NAME
FUNCTION
1 IN1 Channel 1 Filter Input (Optional Boosted Channel)
2 IN2 Channel 2 Filter Input
3 IN3 Channel 3 Filter Input
4 VCC +5V Power Supply. Bypass to GND with a 0.1µF and 1µF capacitor.
5 IN4 Channel 4 Filter Input
6 IN5 Channel 5 Filter Input (Optional Boosted Channel)
7 IN6 Channel 6 Filter Input (Optional Boosted Channel)
8
OUT6
Channel 6 Filter Output
9
OUT5
Channel 5 Filter Output
10
OUT4
Channel 4 Filter Output
11
GND
Ground
12
OUT3
Channel 3 Filter Output
13
OUT2
Channel 2 Filter Output
14
OUT1
Channel 1 Filter Output
Detailed Description
The MAX7440/MAX7441/MAX7442 filter the outputs of
DAC encoder chipsets that process digital video infor-
mation in applications such as set-top boxes, hard disk
recorders, DVD players, DVD recorders, and digital
VCRs. These devices also filter and clean up analog
video signals by rejecting out-of-band noise. Each
channel in the MAX7440/MAX7441/MAX7442 includes
a 4th-order lowpass filter and a gain of +1V/V output
stage, as shown in the Typical Application Circuit.
Filter
Filter Response
Each channel of the reconstruction filter consists of a
4th-order Sallen-Key filter configured as two 2nd-order
stages. The filter features a maximally flat passband for
NTSC, PAL, and SDTV bandwidths. The stopband
offers typically 45dB of attenuation at sampling fre-
quencies of 27MHz and above (see Typical Operating
Characteristics). The filter exhibits a Butterworth-type
response resulting in excellent group delay deviation
performance.
High-Frequency Boost
The high-frequency (HF) boost compensates for signal
degradation and rolloff in the signal path prior to the fil-
ter. This performance increases the image sharpness.
The MAX7441/MAX7442 offer a high-frequency boost
on channels OUT1, OUT5, and OUT6.
Output Stage
The output stages of the MAX7440/MAX7441/MAX7442
are designed to drive 1VP-P signals into high-imped-
ance (>5kΩ) loads. They require external buffers to
drive standard video cables. Most standard audio/
video switching devices include these buffers for STB
applications.
Applications Information
MAX7440/MAX7441/MAX7442 with an A/V
Switching Device
The MAX7440/MAX7441/MAX7442 are designed to
directly interface to an audio/video switching device
used in video applications (i.e., STBs) with SCART
interfaces (see Typical Application Circuit). The output
of the analog filters can drive the high-impedance load
of the switching device. The switching device provides
the buffering to drive standard 150Ω video loads.
MAX7440/MAX7441/MAX7442 with
External Buffers
External buffering is required for the MAX7440/
MAX7441/MAX7442 to drive standard 150Ω video
loads. Figure 1 shows the MAX4394 triple op amp, con-
figured with a gain of +2V/V to drive standard video
loads from the MAX7440/MAX7441/MAX7442.
_______________________________________________________________________________________ 5
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX7441.PDF ] | |
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