MAX7445EUD+ Datasheet MAX7445EUD+, MAX7445EUD+T | P1-P3

General Description

The MAX7445 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/ter-

restrial 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 MAX7445 has three modes of operation. Mode 1

processes CVBS and RGB video signals. Mode 2

processes CVBS, Y, and C signals, as well as a second

asynchronous CVBS video signal. Mode 3 processes

RGB and CVBS (asynchronous) video signals. An exter-

nal pin adjusts the gain of the video buffer to either +6dB,

+9.5dB, or +12dB to accommodate video-encoder DAC

output signals of <1V. High-frequency boost circuitry pro-

vides picture sharpness with +1.2dB of gain boost with-

out degradation in the stopband. The output video drivers

can be disabled with an external pin.

The MAX7445 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 CVBS, RGB, or Y/C

Video 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 Cable <1V

♦ Each Channel Drives Two 150Ω Video Loads

♦ +5V Single-Supply Voltage

♦ Selectable Gain: +6dB, +9.5dB, and +12dB

♦ Small 14-Pin TSSOP Package

MAX7445

4-Channel Video Reconstruction Filter

________________________________________________________________

Maxim Integrated Products

GAIN

GND

MAX7445

OUTA

OUTB

OUTC

OUTD

75Ω

*OPTIONAL CAPACITORS

INA

0.1μF

INB

INC

IND

D/A

ENCODER

D/A

SYNC

DETECTOR

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

SYNC

DETECTOR

DISABLE

SELECT

Functional Diagram

Ordering Information

19-2948; Rev 1; 10/05

EP = Exposed pad.

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

PART

TEMP

RANGE

PIN-PACKAGE PKG CODE

MAX7445EUD

-40°C to

+85°C

14 TSSOP-EP* U14E-3

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX7445

4-Channel Video Reconstruction Filter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +5V ±5%, C

= 0 to 20pF, R

= 75Ω to GND for DC-coupled load, R

= 75Ω to V

/ 2 for AC-coupled load, C

IN_

= 0.1µF,

GAIN = GND (+6dB) or V

(+9.5dB), T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

= +5V, T

= +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.

to GND ...........................................................................+6V

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

+ 0.3V)

Maximum Current into Any Pin Except V

and GND .....±50mA

Continuous Power Dissipation (T

= +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

Channel without

boost (see Table 2)

-0.75 +0.15 +0.75

Passband Response

f = 100kHz to 5MHz,

relative to 100kHz

Channel with boost

(see Table 2)

+0.9 +1.2 +1.5

Stopband Attenuation A

f ≥ 27MHz 39 43 dB

Gain = +6dB,

+9.5dB

0.15 0.50

Differential Gain dG

5-step modulated

staircase

Gain = +12dB 0.25 0.90

Gain = +6dB,

+9.5dB

0.15 0.50

Differential Phase dθ

5-step modulated

staircase

Gain = +12dB 0.15 0.60

Degrees

Signal-to-Noise Ratio SNR

Peak signal (2V

P-P

) to

RMS noise,

f = 100Hz to 50MHz

Gain = +6dB,

+9.5dB, +12dB

69 75 dB

Channel without

boost (see Table 2)

11 20

Group Delay Deviation

Δt

Deviation from 100kHz

to 4.1MHz

Channel with boost

(see Table 2)

17 30

Line-Time Distortion H

DIST

18µs, 100 IRE bar 0.3 %

Field-Time Distortion V

DIST

130 lines, 18µs, 100 IRE bar 0.5 %

Clamp Settling Time t

CLAMP

To ±1% 430 Lines

Channel A 0.6 0.9 1.1

SELECT = GND

Channels B, C, D 1.1 1.5 1.8

Channels A, B, D 0.6 0.9 1.1

SELECT = V

Channel C 1.25 1.6 1.95

Channels A, D 0.6 0.9 1.1

Output DC Clamp Level

SELECT = floating

Channels B, C 1.1 1.5 1.8

Low-Frequency Gain Accuracy A

f = 100kHz, relative to a gain of +6dB -3 +3 %

Low-Frequency Gain Matching A

(

M ATC H

)

Low-frequency channel-to-channel matching,

f = 100kHz

MAX7445

4-Channel Video Reconstruction Filter

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +5V ±5%, C

= 0 to 20pF, R

= 75Ω to GND for DC-coupled load, R

= 75Ω to V

/ 2 for AC-coupled load, C

IN_

= 0.1µF,

GAIN = GND (+6dB) or V

(+9.5dB), T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

= +5V, T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Group Delay Matching

g(MATCH)

Low-frequency channel-to-channel matching,

f = 100kHz

2ns

Channel-to-Channel Crosstalk X

TALK

f = 100kHz to 3.58MHz 60 dB

Output Short-Circuit Current I

OUT_ shorted to GND or V

70 mA

Input Leakage Current I

10 µA

Channel A 1.2

SELECT = GND

Channels B, C, D 0.9

Channels A, B, D 1.2

SELECT = V

Channel C 0.9

Channels A, D 1.2

Input Dynamic Swing for Gain

of +6dB

SELECT = floating

Channels B, C 0.9

P-P

SUPPLY

Supply Voltage Range V

4.75 5.25 V

Supply Current I

No load 100 140 mA

Power-Supply Rejection Ratio PSRR V

= 100mV

P-P

, f = 0 to 3.5MHz 40 dB

DISABLE

Output Impedance During

Disable

DISABLE

At 5MHz 2 kΩ

D i sab l e Log i c- Inp ut H i g h V ol tag eV

2.0 V

D i sab l e Log i c- Inp ut Low V ol tag eV

0.8 V

Disable Logic Input Current I

DISABLE

= 0V (sink), V

= V

(source) ±10 µA

P1-P3 P4-P6 P7-P8

MAX7445EUD+

Mfr. #:

Buy MAX7445EUD+

Manufacturer:

Maxim Integrated

Description:

IC FILTER RECON VID 14-TSSOP

Lifecycle:

New from this manufacturer.

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MAX7445EUD+

MAX7445EUD+

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