Analog-Devices-Inc–Maxim-Integrated-MAX7443ESA

Part #	Analog-Devices-Inc–Maxim-Integrated-MAX7443ESA
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19-2749; Rev 1; 1/06

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

General Description

Features

The MAX7443/MAX7444 are low-cost, triple-channel

video reconstruction filters for S-video and CVBS video

signals. These devices are ideal for anti-aliasing and

DAC smoothing video applications such as set-top

boxes, DVD players, hard-disk recorders (HDRs), and

personal video recorders. These filters operate from a

single +5V supply. They are optimized for NTSC, PAL,

and standard-definition digital TV (SDTV) video systems.

♦

Triple-Channel Filter and Buffer for CVBS and

Y/C (S-Video)

♦

Filter Response Ideal for NTSC, PAL, and

Interlaced SDTV Signals

♦

41dB (typ) Stopband Attenuation at 27MHz

♦

-0.3dB (typ) Passband Response

Each channel consists of a lowpass filter and an

adjustable-gain output buffer capable of driving two

standard 150

Ω

video loads. The output buffers can drive

either an AC or a DC load such that the blanking level

voltage after the backmatch resistor is less than 1V. The

Y and C video inputs are summed to produce the com-

posite video output. The MAX7444 offers high-

frequency boost to improve picture sharpness. The

MAX7443 has a maximum flat-frequency response.

♦

Low Blanking Level Voltage Allows DC-Coupled

Output

♦

Each Channel Drives Two 150

Ω

Video Loads

♦

+5V Single-Supply Voltage

♦

Tiny 8-Pin Thin QFN or 8-Pin SO Packages

Ordering Information

The MAX7443/MAX7444 are available in a tiny 8-pin thin

QFN and an 8-pin SO package with exposed pad, and

are fully specified over the -40°C to +85°C extended

temperature range.

TOP

PKG

PART

PIN-PACKAGE

MARK

CODE

MAX7443

ETA

MAX7443ESA

MAX7444

ETA

MAX7444ESA

8 Thin QFN-EP*

8 SO-EP*

AFX

—

T833-1

S8E-12

T833-1

S8E-12

Applications

8 Thin QFN-EP*

8 SO-EP*

AFY

—

Set-Top Boxes/HDR/DVD

Digital VCRs

Note:

All devices specified over -40°C to +85°C temperature

range.

Security Cameras/Digital

Cameras

Every Composite,

S-Video Output for NTSC,

PAL, SDTV

EP = Exposed pad.

Selector Guide appears at end of data sheet.

Game Consoles

Functional Diagram

ENCODER

D/A

6dB/

9.5dB/

12dB

YIN

LOWPASS

FILTER

YOUT

6dB/

9.5dB/

12dB

CVOUT

COUT

MAX7443

MAX7444

6dB/

9.5dB/

12dB

LOWPASS

FILTER

CIN

D/A

GND

GSET

*OPTIONAL

________________________________________________________________

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.

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

ABSOLUTE MAXIMUM RATINGS

to GND …………………………………………………………………+6V

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

Storage Temperature Rang

……………………….-65°C to +150°C

Junction Temperatur

……………………………………………..+150°C

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

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

Maximum Current into Any Pin Except V

Continuous Power Dissipation (T

= +70°C)

+ 0.3V)

and GND …..

50mA

8-Pin Thin QFN (derate 24.4mW/°C above +70°C) …1951mW

8-Pin SO (derate 18.9mW/°C above +70°C)…………..1509mW

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.

ELECTRICAL CHARACTERISTICS

= +5V

5ꢀ, C

= 0 to 20pF, R

= 75

Ω

to GND for DC-couple, R

= 75

Ω

to V

/2 for AC-couple, C

= C

= 0.1µF,

CIN

YIN

= T

to T

, GSET = GND (6dB) and V

MAX

(9.5dB), unless otherwise noted. Typical values are at T

= +25°C.)

CC A

MIN

PARAMETER

SYMBOL

CONDITIONS

MIN

-0.8

-0.1

TYP

MAX

UNITS

MAX7443

MAX7444

-0.3

+0.1

f = 100kHz to 4.2MHz,

relative to 100kHz

Passband Response

+0.6 +0.92

Stopband Attenuation

Boost Amplitude

f = 27MHz

f = 4.2MHz, MAX7444

0.6

5-step modulated

staircase

Gain = 6dB,

9.5dB, 12dB

Differential Gain

Differential Phase

0.15

0.4

ꢀ

5-step modulated

staircase

Gain = 6dB,

9.5dB, 12dB

Degrees

Peak signal (2V

) to

P-P

RMS noise, f = 100Hz to

50MHz

Gain = 6dB,

9.5dB, 12dB

Signal-to-Noise Ratio

Group Delay Deviation

SNR

MAX7443

MAX7444

Deviation from 100kHz to

4.1MHz

∆

Line-Time Distortion

Field-Time Distortion

Clamp Settling Time

18µs, 100 IRE bar

130 lines, 18µs, 100 IRE bar

To 1ꢀ

0.3

0.5

ꢀ

DIST

430

0.8

1.6

Lines

YOUT

0.6

1.0

Output DC Clamp Level

CVOUT

COUT

1.44

-3.5

1.97

Low-Frequency Gain Accuracy

Group Delay Matching

f = 100kHz, relative to 6dB

ꢀ

Low-frequency channel-to-channel matching,

f = 100kHz for YOUT and COUT

g(MATCH)

Channel-to-Channel Crosstalk

Input Leakage Current

f = 100kHz to 3.58MHz, gain = 6dB

µA

TALK

_______________________________________________________________________________________

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

ELECTRICAL CHARACTERISTICS (continued)

= +5V

5ꢀ, C

= 0 to 20pF, R

= 75

Ω

to GND for DC-couple, R

= 75

Ω

to V

/2 for AC-couple, C

= C

= 0.1µF,

CIN

YIN

= T

to T

, GSET = GND (6dB) and V

MAX

(9.5dB), unless otherwise noted. Typical values are at T

= +25°C.)

CC A

MIN

PARAMETER

SYMBOL

CONDITIONS

GSET = GND (6dB)

MIN

TYP

MAX

1.2

UNITS

INP-P

Input Dynamic Swing

P-P

0.9

INP-P

SUPPLY

Supply Voltage Range

Supply Current

4.75

5.25

110

= +5.25V, no load

Power-Supply Rejection Ratio

PSRR

= 100mV

, f = 0 to 3.5MHz

IN P-P

pical Operating Characteristics

= +5V, T

= +25°C, unless otherwise noted.)

AMPLITUDE vs. FREQUENCY

PASSBAND AMPLITUDE vs. FREQUENCY

PHASE RESPONSE vs. FREQUENCY

2.0

200

150

100

-20

-40

-60

-80

1.5

1.0

0.5

MAX7444

MAX7443

-0.5

-1.0

-50

-100

-150

-200

NORMALIZED TO 0dB

-1.5

-2.0

NORMALIZED TO 0dB

0.1

100

0.1

FREQUENCY (MHz)

MODULATED 12.5T RESPONSE

(1 IRE = 7.14mV)

GROUP DELAY vs. FREQUENCY

2T RESPONSE (1 IRE = 7.14mV)

200mV/div

OUT

200mV/div

OUT

400mV/div

0.1

400ns/div

200ns/div

FREQUENCY (MHz)

_______________________________________________________________________________________

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

pical Operating Characteristics (continued)

= +5V, T

= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. TEMPERATURE

DIFFERENTIAL GAIN

MULTIBURST RESPONSE

0.3

0.2

0.1

-0.1

-0.2

-0.3

YIN

200mV/div

DIFFERENTIAL PHASE

YOUT

0.3

0.2

0.1

-0.1

-0.2

-0.3

200mV/div

-40

-15

s/div

TEMPERATURE (

These devices operate from a single +5V supply. The

filters have a nominal cutoff frequency optimized for

NTSC, PAL, and SDTV.

Pin Description

NAME

FUNCTION

Filter

YIN

Luma (Y) Input

Filter Response

The reconstruction filter consists of two 2nd-order

Sallen-Key stages. The Butterworth-type response fea-

tures a maximally flat passband for NTSC and PAL

bandwidths. The stopband offers 41dB (typ) of attenua-

tion at sampling frequencies of 27MHz and above (see

Typical Operating Characteristics

Gain-Setting Control Input. See Table 1

for values.

GSET

CIN

Chroma (C) Input

Ground

GND

5V Power Supply

Chroma (C) Output

COUT

CVOUT Composite

Video Output

High-Frequency Boost

The high-frequency boost available in the MAX7444

compensates for signal degradation and rolloff in the

video encoder, which increases the image sharpness.

The MAX7443 has a flat response over the video band-

width.

YOUT

Luma (Y) Output

Detailed Description

The primary function of the MAX7443/MAX7444 is to fil-

ter and buffer the encoder DAC outputs that contain

digital video information in applications such as set-top

boxes, hard-disk recorders, DVD players, and digital

VCRs. These devices reconstruct and clean up analog

video signals. Each MAX7443/MAX7444 consists of a

lowpass filter and an adjustable-gain output video

buffer that is capable of driving two standard 150

Ω

video loads. The luma (YIN) and chroma (CIN) video

inputs are summed internally to provide the composite

(CVOUT) video output.

Output Buffer

The output buffer drives two 150

Ω

video loads with a

signal. The adjustable gain of the output buffer

P-P

provides a gain of 6dB, 9.5dB, and 12dB, which are

selected by tying the GSET pin to GND, V

, or float-

ing, respectively. The MAX7443/MAX7444 can drive an

AC load or drive the video load directly without using

the large output capacitor. The output buffer drives a

DC load with an output blanking level of less than 1V.

_______________________________________________________________________________________

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

Selector Guide

Table 1. Gain-Setting Control

PART

HIGH-FREQUENCY BOOST

GSET

GAIN (dB)

MAX7443ETA

MAX7443ESA

MAX7444ETA

MAX7444ESA

GND

9.5

Yes

Open

12dB Gain Setting

The GSET pin is biased internally to V

/2 through two

100k

Ω

resistors from V

to GND. The internal imped-

Pin Configurations

ance at the node is 50k

Ω

. No additional connection is

necessary since the pin offers a minimum noise margin

TOP VIEW

immunity of 1V

P-P

Output Clamp Level

YOUT

YIN

GSET

CIN

When sync pulses in the luma signal (Y) are detected,

the DC restore loop is activated. The function of the

loop is to set the sync tip of the video signal to the

desired DC level of 0.8V for YOUT and COUT and the

average DC voltage of COUT at 1.6V.

CVOUT

COUT

MAX7443

MAX7444

GND

Applications Information

THIN QFN

Input Considerations

Use a 0.1µF ceramic capacitor to AC-couple the input

to the MAX7443/MAX7444. This input capacitor stores

a DC level such that the outputs are clamped to the

appropriate DC voltage level.

YOUT

CVOUT

COUT

YIN

GSET

CIN

MAX7443

MAX7444

Output Considerations

The outputs of the MAX7443/MAX7444 are typically

connected to a 75

Ω

series back-match resistor fol-

lowed by the video cable. Because of the inherent

divide by two of this configuration, the blanking level of

the video cable is always less than 1V, which complies

with industry-standard video requirements. The video

buffer can also drive an AC-coupled video load. Good

video performance is achieved with an output capacitor

as low as 220µF.

GND

Chip Information

TRANSISTOR COUNT: 4252

PROCESS: BiCMOS

Power-Supply Bypassing and Layout

The MAX7443/MAX7444 operate from a single +5V

supply. Bypass V

to GND with a 0.1µF capacitor.

Place all external components as close to the device as

possible. Refer to the MAX7443 evaluation kit for a

proven PC board layout example.

Exposed Pads

Both the SO and thin QFN packages of the MAX7443/

MAX7444 have exposed pads on the bottom of the

packages. These pads are electrically connected to

GND and should be connected to the ground plane for

improved thermal conductivity. Do not route signals

under these packages.

_______________

________________________________________________________________________________________

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to

www.maxim-ic.com/packages

PACKAGE OUTLINE

8L SOIC, .150″ EXPOSED PAD

21-0111

_______________________________________________________________________________________

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to

www.maxim-ic.com/packages

_______________________________________________________________________________________

iple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to

www.maxim-ic.com/packages

PACKAGE VARIATIONS

COMMON DIMENSIONS

SYMBOL

MIN.

0.70

MAX.

0.80

PKG. CODE

T633-2

JEDEC SPEC

MO229 / WEEA

MO229 / WEEC

MO229 / WEED-3

– – – –

[(N/2)-1] x e

1.90 REF

1.95 REF

1.50±0.10

1.70±0.10

2.30±0.10

0.95 BSC

0.65 BSC

0.50 BSC

0.40 BSC

0.40±0.05

0.30±0.05

0.25±0.05

0.20±0.05

T833-2

2.90

3.10

T833-3

0.00

0.20

0.05

0.40

T1033-1

T1033-2

T1433-1

T1433-2

2.00 REF

2.40 REF

0.25 MIN.

0.20 REF.

– – – –

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA

94086 408-737-7600

Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Analog-Devices-Inc–Maxim-Integrated-MAX7443ESA

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