Rainbow-electronics MAX7473 Manual de usuario

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MAX7472/MAX7473
HDTV Anti-Aliasing Filters with Triple-Input Mux
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-0619; Rev 0; 8/06
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.
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
480i, 480p, 720p, 1080i
QVGA, VGA, SVGA, XGA, SXGA, UXGA
Y P
B
P
R
, GsBR, RGBHV, Y/C, CVBS
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
Single +5V Analog and +3.3V Digital Supplies
5mW Power-Down Mode
Lead (Pb)-Free 28-Pin TQFN Package
General Description
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
component video (Y P
B
P
R
, GsBR, and RGBHV) as well
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 I
2
C 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 I
2
C interface.
The MAX7472/MAX7473 drive a 2V
P-P
video signal into
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.
Features
EVALUATION KIT
AVAILABLE
Note: All devices are specified over the 0°C to +85°C operat-
ing temperature range.
+Indicates lead-free packaging.
*EP = Exposed pad.
**
Future product—contact factory for availability.
PART PIN-PACKAGE PKG CODE
BUFFER
GAIN (dB)
MAX7472UTI+ 28 TQFN-EP* T2855-8 0
MAX7473UTI+** 28 TQFN-EP* T2855-8 +6
26
27
25
24
10
9
11
AGND
INB2
INC2
AGND
INA3
12
INC1
AV
DD
AV
DD
OUT3
OUT1
DV
DD
SDA
12
AGND
4567
2021 19 17 16 15
AGND
INA1
SYNCB
SYNCA
DGND
INC3
MAX7472
MAX7473
INA2
OUT2
3
18
28
+
8
INB1
INB3
A1
23
13
SYNCC
A0
22
14
SCL
AV
DD
TQFN
5mm x 5mm
*EXPOSED PAD.
TOP VIEW
EP*
Pin Configuration
HDTV (LCD, PDP, DLP, CRT)
Set-Top Boxes
Personal Video Recorders
Home Theaters
Applications
Typical Operating Circuit appears at end of data sheet.
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Indice de contenidos

Pagina 1 - MAX7472/MAX7473

MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux________________________________________________________________Maxim Integrated Produc

Pagina 2

MAX7472/MAX7473Early STOP ConditionsThe MAX7472/MAX7473 recognize a STOP condition atany point during transmission except when a STOPcondition occurs

Pagina 3

tion). After receiving the proper address, theMAX7472/MAX7473 (slave) issue an ACK by pullingSDA low for one clock cycle.The MAX7472/MAX7473 slave add

Pagina 4

MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux12 ____________________________________________________________________________________

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Read CycleIn read mode (R/W = 1), the MAX7472/MAX7473 writethe contents of the Status, Channel Selection, orFrequency register to the bus. When the co

Pagina 6

MAX7472/MAX7473Control/Status RegisterThe MAX7472/MAX7473 store their status in an 8-bitregister that can be read back by the master. The indi-vidual

Pagina 7

Channel-Selection RegisterThe MAX7472/MAX7473 store channel selection in an8-bit register that can be read back by the master. Theindividual bits of t

Pagina 8

MAX7472/MAX7473Power-Supply Bypassing and Layout ConsiderationsThe MAX7472/MAX7473 operate from a single +5Vanalog supply and +3.3V digital supply. By

Pagina 9

MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux______________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux18 ____________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input MuxMaxim cannot assume responsibility for use of any circuitry other than circuitry entire

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux2 _____________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux_______________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux4 _____________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux_______________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux6 _____________________________________________________________________________________

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MAX7472/MAX7473HDTV Anti-Aliasing Filters with Triple-Input Mux_______________________________________________________________________________________

Pagina 18

MAX7472/MAX7473Component/Composite SelectionThe MAX7472/MAX7473 accept component or com-posite inputs. The sync detection path provides anadditional s

Pagina 19

As shown in the Sync Detector and Clamp Levelssec-tion, the low clamp level is used for signals with syncinformation and determines the voltage level

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