MAXIM MAX7449 Technical data

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General Description

The MAX7449, 3-channel, buffered video reconstruc­tion filter is ideal for anti-aliasing and digital-to-analog
converter (DAC)-smoothing video applications or wher­ever analog video is reconstructed from a digital data
stream (such as cable/satellite/terrestrial set-top boxes,
DVD players, hard-disk recorders (HDRs), and person­al 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 standard­definition digital TV (SDTV) video systems. Each output
is capable of driving two standard 150Ω video loads.

The MAX7449 processes component RGB video signals.
The output video buffers have a fixed gain of +6dB. The
output video drivers can be disabled with an external pin.

The MAX7449 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 Game Consoles

Desktop Video Editors DVD Players

Digital VCRs

Features

♦ 3-Channel Filter and Buffer for RGB Video Signals

♦ External Sync Signal Input

♦ Filter Response Ideal for NTSC, PAL, and

Interlaced SDTV Video Signals

♦ 43dB (typ) Stopband Attenuation at 27MHz

♦ ±0.75dB (max) Passband Ripple at 5MHz

♦ Blanking Level Voltage on Output <1V

♦ Each Channel Drives Two 150Ω Video Loads

♦ +5V Single-Supply Voltage

♦ Small 14-Pin TSSOP Package

MAX7449

3-Channel Video Reconstruction Filter

for RGB Component Video

________________________________________________________________ Maxim Integrated Products 1

Functional Diagram

Ordering Information

19-2990; Rev 0; 9/03

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.

*EP = Exposed pad.

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX7449EUD -40°C to +85°C 14 TSSOP-EP*

V

CC

ENCODER

75Ω

0.1µF
INA

INB

INC

GND

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

MAX7449

EXTSYNC

DISABLE

D/A

R

0.1µF

G

D/A

0.1µF

D/A

B

OUTA

OUTB

OUTC

75Ω

75Ω

75Ω

75Ω

75Ω

*OPTIONAL CAPACITORS

*

*

*

*

*

*

75Ω

75Ω

75Ω

75Ω

75Ω

75Ω

MAX7449

3-Channel Video Reconstruction Filter
for RGB Component Video

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V, CL= 0 to 20pF, RL= 75Ω to GND for DC-coupled load, RL= 75Ω to V

CC

/ 2 for AC-coupled load, C

IN_

=

0.1µF, GAIN = +6dB, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V, TA= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VCCto GND ...........................................................................+6V

All Other Pins to GND.................................-0.3V to (V

CC

+ 0.3V)

Maximum Current into Any Pin Except V

CC

and GND .....±50mA

Continuous Power Dissipation (T

A

= +70°C)

TSSOP-EP (derate 20.8mW/°C above +70°C)...........1667mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

)

Passband Response

Stopband Attenuation A

Differential Gain dG 5-step modulated staircase 0.15 0.50 %

Differential Phase

Signal-to-Noise Ratio SNR

Group Delay Deviation ∆t

Line-Time Distortion H

Field-Time Distortion V

Clamp Settling Time t

Output DC Clamp Level Channels A, B, C 1.1 1.5 1.8 V

Low-Frequency Gain Accuracy A

Low-Frequency Gain Matching A

Group Delay Matching

Channel-to-Channel Crosstalk X

Output Short-Circuit Current I

Input Leakage Current I

Input Dynamic Swing Channels A, B, C 0.9 V

SUPPLY

Supply Voltage Range V

Supply Current I

Power-Supply Rejection Ratio PSRR V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

f = 100kHz to 5MHz, relative to 100kHz,
channels A, B, C

f ≥ 27MHz 39 43 dB

SB

dθ

DIST

DIST

CLAMP

V(MATCH

t

g(MATCH)

TALK

SC

CC

CC

5-step modulated staircase 0.15 0.50 Degrees

Peak signal (2V
f = 100Hz to 50MHz

Deviation from 100kHz to 4.1MHz 11 20 ns

g

18µs, 100 IRE bar 0.3 %

130 lines, 18µs, 100 IRE bar 0.5 %

To ±1% 100 Lines

f = 100kHz -3 +3 %

V

Low-frequency channel-to-channel
matching, f = 100kHz

Low-frequency channel-to-channel
matching, f = 100kHz

f = 100kHz to 3.58MHz 60 dB

OUT_ shorted to GND or V

IN

No load 75 100 mA

= 100mV

IN

-0.75 +0.15 +0.75 dB

) to RMS noise,

P-P

CC

4.75 5.25 V

, f = 0 to 3.5MHz 40 dB

P-P

80 dB

4%

2ns

70 mA

10 µA

P-P