MAXIM MAX7447 Technical data

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General Description

The MAX7447 4-channel, buffered video reconstruction
filter is ideal for anti-aliasing and 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 standard-definition digital TV (SDTV)
video systems. Each output is capable of driving two
standard 150Ω video loads.

The MAX7447 processes S-Video and CVBS video sig­nals. The video output buffers have a fixed gain of +6dB.
Each channel has high-frequency boost circuitry that pro­vides picture sharpness with up to +1.2dB of gain boost
without degradation in the stopband. The output video
drivers can be disabled with an external pin.

The MAX7447 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

♦ 4-Channel Filter and Buffer for S-Video and

CVBS Signals

♦ Filter Response Ideal for NTSC, PAL, and

Interlaced SDTV Video Signals

♦ 43dB (typ) Stopband Attenuation at 27MHz

♦ ±0.75dB (max) Passband Ripple Out to 5MHz

♦ Blanking Level Voltage on Output <1V

♦ Each Channel Drives Two 150Ω Video Loads

♦ +5V Single-Supply Voltage

♦ Small 14-Pin TSSOP Package

MAX7447

4-Channel S-Video, CVBS Video Filter with

Asynchronous CVBS Input

________________________________________________________________ Maxim Integrated Products 1

Functional Diagram

Ordering Information

19-2950; Rev 0; 8/03

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.

Pin Configuration appears at end of data sheet.

ENCODER

0.1µF

CVBS

CVBS

INA

INC

IND

LOWPASS

FILTER

INB

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

D/A

Y

C

0.1µF

D/A

0.1µF

D/A

0.1µF

D/A

SYNC

DETECTOR

SYNC

DETECTOR

GND

PART TEMP RANGE PIN-PACKAGE

MAX7447EUD -40°C to +85°C 14 TSSOP-EP*

V

CC

75Ω

75Ω

75Ω

75Ω

75Ω

75Ω

75Ω

75Ω

MAX7447

DISABLE

75Ω

OUTA

75Ω

75Ω

OUTB

75Ω

75Ω

OUTC

75Ω

75Ω

OUTD

75Ω

*OPTIONAL CAPACITORS

*

*

*

*

*

*

*

*

MAX7447

4-Channel S-Video, CVBS Video Filter with
Asynchronous CVBS Input

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= +5V ±5%, 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,

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Passband Response f = 100kHz to 5MHz, relative to 100kHz 0.9 1.2 1.5 dB

Stopband Attenuation A

Differential Gain dG 5-step modulated staircase 0.15 0.50 %

Differential Phase dθ 5-step modulated staircase 0.15 0.50 D eg r ees

Signal-to-Noise Ratio SNR

Group Delay Deviation

Line-Time Distortion H

Field-Time Distortion V

Clamp Settling Time t

Output DC Clamp Level

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

SUPPLY

Supply Voltage Range V

Supply Current I

Power-Supply Rejection Ratio PSRR V

f ≥ 27MHz 39 43 dB

SB

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

∆t

g Deviation from 100kHz to 4.1MHz 17 30 ns

DIST

DIST

CLAMP

V ( M ATC H )

t

g(MATCH)

TALK

18µs, 100 IRE bar 0.3 %

130 lines, 18µs, 100 IRE bar 0.5 %

To ±1% 100 Lines

Channel A, B, D 0.6 0.9 1.1

Channel C 1.25 1.60 1.95

f = 100kHz, relative to a gain of +6dB -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

SC

IN

Channel A, B, D 1.2

Channel C 0.9

CC

No load 100 140 mA

CC

= 100mV

IN

P-P

) to RMS noise,

P-P

CC

4.75 5.25 V

, f = 0 to 3.5MHz 40 dB

80 dB

2ns

70 mA

4%

10 µA

V

V

P-P