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PDF MAX7443 Data sheet ( Hoja de datos )
| Número de pieza | MAX7443 | |
| Descripción | Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX7443 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-2749; Rev 0; 1/03
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
General Description
The MAX7443/MAX7444 are low-cost, triple-channel
video reconstruction filters for S-video and CVBS video
signals. These devices are ideal for anti-aliasing and
DAC smoothing video applications such as set-top
boxes, DVD players, hard-disk recorders (HDRs), and
personal video recorders. These filters operate from a
single +5V supply. They are optimized for NTSC, PAL,
and standard-definition digital TV (SDTV) video systems.
Each channel consists of a lowpass filter and an
adjustable-gain output buffer capable of driving two
standard 150Ω video loads. The output buffers can drive
either an AC or a DC load such that the blanking level
voltage after the backmatch resistor is less than 1V. The
Y and C video inputs are summed to produce the com-
posite video output. The MAX7444 offers high-
frequency boost to improve picture sharpness. The
MAX7443 has a maximum flat-frequency response.
The MAX7443/MAX7444 are available in a tiny 8-pin thin
QFN and an 8-pin SO package with exposed pad, and
are fully specified over the -40°C to +85°C extended
temperature range.
Applications
Set-Top Boxes/HDR/DVD
Security Cameras/Digital
Cameras
Game Consoles
Digital VCRs
Every Composite,
S-Video Output for NTSC,
PAL, SDTV
Features
o Triple-Channel Filter and Buffer for CVBS and
Y/C (S-Video)
o Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Signals
o 41dB (typ) Stopband Attenuation at 27MHz
o -0.3dB (typ) Passband Response
o Low Blanking Level Voltage Allows DC-Coupled
Output
o Each Channel Drives Two 150Ω Video Loads
o +5V Single-Supply Voltage
o Tiny 8-Pin Thin QFN or 8-Pin SO Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7443ETA
MAX7443ESA
MAX7444ETA
MAX7444ESA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
8 Thin QFN-EP*
8 SO-EP*
8 Thin QFN-EP*
8 SO-EP*
*EP = Exposed pad.
Selector Guide appears at end of data sheet.
TOP
MARK
AFX
—
AFY
—
Functional Diagram
VCC
ENCODER
D/A
YIN
LOWPASS
FILTER
6dB/
9.5dB/
12dB
MAX7443
MAX7444
6dB/
Σ 9.5dB/
12dB
YOUT
CVOUT
*
*
*
*
CIN LOWPASS
D/A FILTER
GND
6dB/
9.5dB/
12dB
COUT
GSET
*
*
*OPTIONAL
________________________________________________________________ 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  
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
Table 1. Gain-Setting Control
Selector Guide
GSET
GND
VCC
Open
GAIN (dB)
6
9.5
12
12dB Gain Setting
The GSET pin is biased internally to VCC/2 through two
100kΩ resistors from VCC to GND. The internal imped-
ance at the node is 50kΩ. No additional connection is
necessary since the pin offers a minimum noise margin
immunity of 1VP-P.
Output Clamp Level
When sync pulses in the luma signal (Y) are detected,
the DC restore loop is activated. The function of the
loop is to set the sync tip of the video signal to the
desired DC level of 0.8V for YOUT and COUT and the
average DC voltage of COUT at 1.6V.
Applications Information
Input Considerations
Use a 0.1µF ceramic capacitor to AC-couple the input
to the MAX7443/MAX7444. This input capacitor stores
a DC level such that the outputs are clamped to the
appropriate DC voltage level.
Output Considerations
The outputs of the MAX7443/MAX7444 are typically
connected to a 75Ω series back-match resistor fol-
lowed by the video cable. Because of the inherent
divide by two of this configuration, the blanking level of
the video cable is always less than 1V, which complies
with industry-standard video requirements. The video
buffer can also drive an AC-coupled video load. Good
video performance is achieved with an output capacitor
as low as 220µF.
Power-Supply Bypassing and Layout
The MAX7443/MAX7444 operate from a single +5V
supply. Bypass VCC to GND with a 0.1µF capacitor.
Place all external components as close to the device as
possible. Refer to the MAX7443 evaluation kit for a
proven PC board layout example.
Exposed Pads
Both the SO and thin QFN packages of the MAX7443/
MAX7444 have exposed pads on the bottom of the
packages. These pads are electrically connected to
GND and should be connected to the ground plane for
improved thermal conductivity. Do not route signals
under these packages.
PART
MAX7443ETA
MAX7443ESA
MAX7444ETA
MAX7444ESA
HIGH-FREQUENCY BOOST
No
No
Yes
Yes
Pin Configurations
TOP VIEW
YIN 1
GSET 2
CIN 3
GND 4
8 YOUT
MAX7443
MAX7444
7 CVOUT
6 COUT
5 VCC
THIN QFN
YIN 1
GSET 2
CIN 3
GND 4
MAX7443
MAX7444
SO
8 YOUT
7 CVOUT
6 COUT
5 VCC
Chip Information
TRANSISTOR COUNT: 4252
PROCESS: BiCMOS
_______________________________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX7443.PDF ] | |
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