MAX7444ESA+ - Maxim Integrated - Datasheet.Directory

General Description

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.

Each channel consists of a lowpass filter and an

adjustable-gain output buffer capable of driving two

standard 150Ωvideo 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.

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.

Applications

Features

♦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

♦Low Blanking Level Voltage Allows DC-Coupled

Output

♦Each Channel Drives Two 150ΩVideo Loads

♦+5V Single-Supply Voltage

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

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2749; Rev 1; 1/06

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.

EVALUATION KIT

AVAILABLE

PART

PIN-PACKAGE

TOP

MARK

PKG

CODE

MAX7443ETA

8 Thin QFN-EP*

AFX T833-1

MAX7443ESA 8 SO-EP* — S8E-12

MAX7444ETA

8 Thin QFN-EP*

AFY T833-1

MAX7444ESA 8 SO-EP* — S8E-12

D/A CIN LOWPASS

FILTER

LOWPASS

FILTER

YIN

D/A

6dB/

9.5dB/

12dB

6dB/

9.5dB/

12dB

6dB/

9.5dB/

12dB

GSET

COUT

CVOUT

YOUT

*OPTIONAL

GND

VCC

ENCODER

MAX7443

MAX7444

Functional Diagram

Set-Top Boxes/HDR/DVD

Security Cameras/Digital

Cameras

Game Consoles

Digital VCRs

Every Composite,

S-Video Output for NTSC,

PAL, SDTV

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

range.

*EP = Exposed pad.

Selector Guide appears at end of data sheet.

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

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

All Other Pins to GND.................................-0.3V to (VCC + 0.3V)

Maximum Current into Any Pin Except VCC and GND .....±50mA

Continuous Power Dissipation (TA= +70°C)

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

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

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

ELECTRICAL CHARACTERISTICS

(VCC = +5V ±5%, CL= 0 to 20pF, RL= 75Ωto GND for DC-couple, RL= 75Ωto VCC/2 for AC-couple, CYIN = CCIN = 0.1µF,

TA= TMIN to TMAX, GSET = GND (6dB) and VCC (9.5dB), unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

MAX7443

-0.8 -0.3 +0.1

Passband Response f = 100kHz to 4.2MHz,

relative to 100kHz MAX7444

-0.1 +0.6 +0.92

Stopband Attenuation ASB f = 27MHz 39 41 dB

Boost Amplitude f = 4.2MHz, MAX7444

0.6

Differential Gain dG 5-step modulated

staircase

Gain = 6dB,

9.5dB, 12dB

0.15 0.4

Differential Phase dθ5-step modulated

staircase

Gain = 6dB,

9.5dB, 12dB

0.15 0.4

Degrees

Signal-to-Noise Ratio SNR

Peak signal (2VP-P) to

RMS noise, f = 100Hz to

50MHz

Gain = 6dB,

9.5dB, 12dB 67 73 dB

MAX7443 8 20

Group Delay Deviation ∆tgDeviation from 100kHz to

4.1MHz MAX7444 12 30 ns

Line-Time Distortion HDIST 18µs, 100 IRE bar

0.3

Field-Time Distortion VDIST 130 lines, 18µs, 100 IRE bar

0.5

Clamp Settling Time To ±1%

430

Lines

YOUT

0.6 0.8 1.0

CVOUT

0.6 0.8 1.0

Output DC Clamp Level

COUT

1.44 1.6 1.97

Low-Frequency Gain Accuracy AVf = 100kHz, relative to 6dB

-3.5

+2 %

Group Delay Matching

tg(MATCH) Low-frequency channel-to-channel matching,

f = 100kHz for YOUT and COUT 2ns

Channel-to-Channel Crosstalk XTALK f = 100kHz to 3.58MHz, gain = 6dB 61 dB

Input Leakage Current IIN 10 µA

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +5V ±5%, CL= 0 to 20pF, RL= 75Ωto GND for DC-couple, RL= 75Ωto VCC/2 for AC-couple, CYIN = CCIN = 0.1µF,

TA= TMIN to TMAX, GSET = GND (6dB) and VCC (9.5dB), unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

YINP-P GSET = GND (6dB)

1.2

Input Dynamic Swing CINP-P GSET = GND (6dB)

0.9

VP-P

SUPPLY

Supply Voltage Range VCC

4.75 5.25

Supply Current ICC VCC = +5.25V, no load 88

110

Power-Supply Rejection Ratio PSRR VIN = 100mVP-P, f = 0 to 3.5MHz 33 dB

Typical Operating Characteristics

(VCC = +5V, TA= +25°C, unless otherwise noted.)

-80

1 10 100

AMPLITUDE vs. FREQUENCY

MAX7443/44 toc01

FREQUENCY (MHz)

AMPLITUDE (dB)

-60

-20

-40

NORMALIZED TO 0dB

-2.0

0.1 1 10

PASSBAND AMPLITUDE vs. FREQUENCY

MAX7443/44 toc02

FREQUENCY (MHz)

AMPLITUDE (dB)

0.5

-0.5

2.0

NORMALIZED TO 0dB

1.5

1.0

-1.5

-1.0

MAX7443

MAX7444

-200

0.1 1 10

PHASE RESPONSE vs. FREQUENCY

MAX7443/44 toc03

FREQUENCY (MHz)

PHASE (DEGREES)

-50

200

150

100

-150

-100

0.1 1 10

GROUP DELAY vs. FREQUENCY

MAX7443/44 toc04

FREQUENCY (MHz)

GROUP DELAY (ns)

2T RESPONSE (1 IRE = 7.14mV)

MAX7443/44 toc05

200ns/div

YIN

200mV/div

YOUT

400mV/div

MODULATED 12.5T RESPONSE

(1 IRE = 7.14mV)

MAX7443/44 toc06

400ns/div

YIN

200mV/div

YOUT

200mV/div

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

4 _______________________________________________________________________________________

-40 10-15 35 60 85

SUPPLY CURRENT

vs. TEMPERATURE

MAX7443/44 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

DIFFERENTIAL GAIN

MAX7443/44 toc08

DIFFERENTIAL PHASE (DEGREES)

13245

0.2

0.3

0.1

-0.1

-0.2

-0.3

DIFFERENTIAL GAIN (%)

0.2

0.3

0.1

-0.1

-0.2

-0.3

DIFFERENTIAL PHASE

MULTIBURST RESPONSE

MAX7443/44 toc09

YIN

200mV/div

YOUT

200mV/div

10µs/div

Typical Operating Characteristics (continued)

(VCC = +5V, TA= +25°C, unless otherwise noted.)

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 150Ω

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

inputs are summed internally to provide the composite

(CVOUT) video output.

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

filters have a nominal cutoff frequency optimized for

NTSC, PAL, and SDTV.

Filter

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).

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.

Output Buffer

The output buffer drives two 150Ωvideo loads with a

2VP-P signal. The adjustable gain of the output buffer

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

selected by tying the GSET pin to GND, VCC, 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.

NAME

FUNCTION

1 YIN Luma (Y) Input

2 GSET Gain-Setting Control Input. See Table 1

for values.

3 CIN Chroma (C) Input

4 GND Ground

CC 5V Power Supply

COUT

Chroma (C) Output

CVOUT

Composite Video Output

YOUT

Luma (Y) Output

Pin Description

12dB Gain Setting

The GSET pin is biased internally to VCC/2 through two

100kΩresistors from VCC to GND. The internal imped-

ance at the node is 50kΩ. No additional connection is

necessary since the pin offers a minimum noise margin

immunity of 1VP-P.

Output Clamp Level

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.

Applications Information

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.

Output Considerations

The outputs of the MAX7443/MAX7444 are typically

connected to a 75Ωseries 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.

Power-Supply Bypassing and Layout

The MAX7443/MAX7444 operate from a single +5V

supply. Bypass VCC 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.

Chip Information

TRANSISTOR COUNT: 4252

PROCESS: BiCMOS

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

_______________________________________________________________________________________________________ 5

GSET GAIN (dB)

GND 6

VCC 9.5

Open 12

Table 1. Gain-Setting Control

COUT

VCC

GND

YOUT

CVOUTGSET

CIN

YIN

THIN QFN

TOP VIEW

COUT

VCC

GND

YOUT

CVOUT

GSET

CIN

YIN

MAX7443

MAX7444

MAX7443

MAX7444

Pin Configurations

Selector Guide

PART HIGH-FREQUENCY BOOST

MAX7443ETA No

MAX7443ESA No

MAX7444ETA Yes

MAX7444ESA Yes

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

6 _______________________________________________________________________________________

8L, SOIC EXP. PAD.EPS

21-0111

PACKAGE OUTLINE

8L SOIC, .150" EXPOSED PAD

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.)

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

_______________________________________________________________________________________ 7

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.)

6, 8, &10L, DFN THIN.EPS

MAX7443/MAX7444

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

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.

8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

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.)

COMMON DIMENSIONS

SYMBOL MIN. MAX.

A 0.70 0.80

D 2.90 3.10

E 2.90 3.10

A1 0.00 0.05

L 0.20 0.40

PKG. CODE N D2 E2 eJEDEC SPEC b[(N/2)-1] x e

PACKAGE VARIATIONS

0.25 MIN.k

A2 0.20 REF.

2.00 REF0.25±0.050.50 BSC2.30±0.1010T1033-1

2.40 REF0.20±0.05- - - - 0.40 BSC1.70±0.10 2.30±0.1014T1433-1

1.50±0.10 MO229 / WEED-3

0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10

T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF

T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF

T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF

2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010T1033-2