19-0619; Rev 0; 8/06
HDTV Anti-Aliasing Filters with Triple-Input Mux
2/MAX473
General Description
Features
The MAX7472/MAX7473 triple-channel anti-aliasing fil-
ters and buffers with triple-input mux are ideal for high-
definition (HD) and standard-definition (SD) television
(TV) applications. Compatible with 1080i, 720p, 480p,
and 480i scanning system standards as well as com-
puter format signals, the MAX7472/MAX7473 support
ꢀ Continuously Variable Anti-Aliasing Filter
5MHz to 34MHz in 256 Steps
ꢀ 3:1 Input Mux on Each Video Filter
ꢀ Supports All Standard Video and Computer Input
Formats
component video (Y P P , GsBR, and RGBHV) as well
B
R
480i, 480p, 720p, 1080i
QVGA, VGA, SVGA, XGA, SXGA, UXGA
as composite (CVBS) and S-video (Y/C).
The MAX7472/MAX7473 limit the input bandwidth for
anti-aliasing and out-of-band noise reduction prior to
digital conversion by an ADC or video decoder. The
frequency response of the MAX7472/MAX7473 can be
continuously varied in 256 linear steps from below SD
response to beyond HD response through an I2C inter-
face. The adjustable cutoff frequency allows filter opti-
mization for sampling rate and noise reduction. The
MAX7472/MAX7473 also include 3:1 multiplexers for
selection of three complete sets of video inputs through
the I2C interface.
Y P P , GsBR, RGBHV, Y/C, CVBS
B
R
ꢀ Accepts Any Input Sync Format
Sync on Y, Sync on G, External Sync
(Positive or Negative)
Sync on All Channels
ꢀ Buffered Outputs Drive Standard 150Ω Video Load
0dB (MAX7472)
+6dB (MAX7473)
ꢀ DC- or AC-Coupled Outputs
The MAX7472/MAX7473 drive a 2V
video signal into
P-P
ꢀ Single +5V Analog and +3.3V Digital Supplies
ꢀ 5mW Power-Down Mode
a standard 150Ω load. The inputs are AC-coupled and
the outputs can be either DC- or AC-coupled. The
MAX7472 has a gain of 0dB and the MAX7473 has a
gain of +6dB. Both devices are available in a 28-pin
TQFN package and are fully specified over the upper-
commercial (0°C to +85°C) temperature range.
ꢀ Lead (Pb)-Free 28-Pin TQFN Package
Ordering Information
BUFFER
GAIN (dB)
PART
PIN-PACKAGE PKG CODE
MAX7472UTI+
28 TQFN-EP*
T2855-8
T2855-8
0
Applications
MAX7473UTI+** 28 TQFN-EP*
+6
Note: All devices are specified over the 0°C to +85°C operat-
HDTV (LCD, PDP, DLP, CRT)
Set-Top Boxes
ing temperature range.
+Indicates lead-free packaging.
*EP = Exposed pad.
Personal Video Recorders
Home Theaters
**Future product—contact factory for availability.
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
14
13
AV
22
A0 23
SCL
DD
SYNCC
12 SYNCB
24
25
26
27
28
A1
Typical Operating Circuit appears at end of data sheet.
SYNCA
DGND
INC3
11
10
9
MAX7472
MAX7473
AGND
AGND
INA1
EP*
+
8
INB3
INB1
1
2
3
4
5
6
7
TQFN
5mm x 5mm
*EXPOSED PAD.
________________________________________________________________ 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.