Rainbow Electronics MAX7470 User Manual

Hdtv continuously variable anti-aliasing filters, General description, Applications

General Description

The MAX7469/MAX7470 triple-channel, anti-aliasing fil-
ters and buffers are ideal for high-definition (HD) and
standard-definition (SD) television (TV) applications.
Compatible with 1080i, 720p, 720i, 480p, and 480i
scanning system standards and computer format sig-
nals, the MAX7469/MAX7470 support component video
(Y P

, G

BR, and RGBHV), as well as composite

(CVBS) and S-video (Y/C).

The MAX7469/MAX7470 limit the input bandwidth for
anti-aliasing and out-of-band noise reduction prior to
digital conversion by an ADC or video decoder. The
MAX7469/MAX7470 frequency response can be contin-
uously varied in 256 linear steps through an I

C* inter-

face from below SD resolution to beyond HD resolution.

The output buffers of the MAX7469/MAX7470 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 MAX7469 has a gain of 0dB, and the
MAX7470 has a gain of +6dB. Both devices are available
in a 20-pin TQFN package and are fully specified over
the 0°C to +85°C upper-commercial temperature range.

Applications

HDTV (LCD, PDP, DLP, CRT)

Set-Top Boxes

Personal Video Recorders

Home Theaters

Features

♦ Continuously Variable Anti-Aliasing Filter

5MHz to 34MHz in 256 Steps

♦ Supports All Standard Video and Computer Input

Formats

480i, 480p, 720i, 720p, 1080i
QVGA, VGA, SVGA, XGA, SXGA, UXGA
Y P

, G

BR, 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 (MAX7469)

+6dB (MAX7470)

♦ DC- or AC-Coupled Outputs
♦ Single +5V Analog and +3.3V Digital Supplies
♦ 5mW Power-Down Mode
♦ 20-Pin TQFN Lead-Free Package

MAX7469/MAX7470

PART

PIN-PACKAGE

BUFFER

GAIN (dB)

PKG

CODE

M A X7 4 6 9 U TP + 20

TQFN-EP*

T2055-4

M A X7 4 7 0 U TP + **

20 TQFN-EP*

T2055-4

Ordering Information

19-0548; Rev 0; 5/06

HDTV Continuously Variable

Anti-Aliasing Filters

Typical Operating Circuit appears at end of data sheet.

Purchase of I

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associate Companies, conveys a
license under the Philips I

C Patent Rights to use these compo-

nents in an I

C system, provided that the system conforms to the

C Standard Specification defined by Philips.

________________________________________________________________

Maxim Integrated Products

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.

Note:

All devices are specified over the 0°C to +85°C operating

temperature range.
+

Indicates lead-free packaging.

EP = Exposed pad.

Future product—contact factory for availability.

Pin Configuration

MAX7469
MAX7470

TQFN (5mm x 5mm)

*EXPOSED PAD.

SEE PIN DESCRIPTION FOR CONNECTION.

TOP VIEW

EXTSYNC

SDA

DGND

GND

IN2

GND

IN3

OUT2

OUT3

SCL

GND

OUT1

IN1

*EP