MAX7448 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – 4-Channel RGB Video Filter with Asynchronous CVBS Input

19-2989; Rev 0; 10/03
EVAALVUAAILTAIOBNLEKIT
4-Channel RGB Video Filter with
Asynchronous CVBS Input
General Description
The MAX7448, 4-channel, buffered video reconstruc-
tion filter is ideal for anti-aliasing and digital-to-analog
converter (DAC)-smoothing video applications or wher-
ever analog video is reconstructed from a digital data
stream (such as cable/satellite/terrestrial set-top boxes,
DVD players, hard-disk recorders (HDRs), and person-
al video recorders (PVRs)). This device operates from a
single +5V supply and has a flat passband out to 5MHz
with a stopband attenuation of 43dB at 27MHz. This
makes it ideal for use with NTSC, PAL, and standard-
definition digital TV (SDTV) video systems. Each output
is capable of driving two standard 150Ω video loads.
The MAX7448 processes RGB and asynchronous CVBS
video signals. The output video buffers have a fixed gain
of +6dB. The channel used for CVBS video has high-fre-
quency boost circuitry, which provides picture sharpness
with +1.2dB of gain boost without degradation in the
stopband. The output video drivers can be disabled with
an external pin.
The MAX7448 is available in a 14-pin TSSOP package
with an exposed pad, and is specified over the -40°C to
+85°C extended temperature range.
Applications
Set-Top Boxes/HDRs
DVD Players
Game Consoles
Digital VCRs
Desktop Video Editors
Features
o 4-Channel Filter and Buffer for RGB and CVBS
Video Signals
o Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Video Signals
o 43dB (typ) Stopband Attenuation at 27MHz
o ±0.75dB (max) Passband Ripple Out to 5MHz
o Blanking Level Voltage on Cable <1V
o Each Channel Drives Two 150Ω Video Loads
o +5V Single-Supply Voltage
o Small 14-Pin TSSOP Package
Ordering Information
PART
MAX7448EUD
*EP = Exposed pad.
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
14 TSSOP-EP*
Pin Configuration appears at end of data sheet.
Functional Diagram
ENCODER
G
(WITH SYNC)
D/A
0.1µF
INA
LOWPASS
FILTER
V_CC
SYNC
DETECTOR
R D/A
0.1µF
INB
LOWPASS
FILTER
B D/A
0.1µF
INC
LOWPASS
FILTER
CVBS
(WITH SYNC)
D/A
0.1µF
IND
LOWPASS
FILTER
SYNC
DETECTOR
MAX7448
GND
75Ω
75Ω
*
OUTA
75Ω
75Ω
*
75Ω
75Ω
*
OUTB
75Ω
75Ω
*
75Ω
75Ω
*
OUTC
75Ω
75Ω
*
75Ω
75Ω
*
OUTD
75Ω
75Ω
*
*OPTIONAL CAPACITORS
DISABLE
________________________________________________________________ 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.