MAXIM MAX7443, MAX7444 User Manual

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 150Ω 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 composite video output. The MAX7444 offers highfrequency 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 150Ω Video 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

PKG

CODE

MAX7443ETA

AFX T833-1

MAX7443ESA 8 SO-EP* — S8E-12

MAX7444ETA

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

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.

MARK

8 Thin QFN-EP*

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.

VCCto 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) 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= 75Ω to GND for DC-couple, RL= 75Ω to VCC/2 for AC-couple, C

YIN

= C

CIN

= 0.1µF,

= T

MIN

to T

MAX

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

PARAMETER

CONDITIONS

UNITS

MAX7443

Passband Response

f = 100kHz to 4.2MHz, relative to 100kHz

MAX7444

Stopband Attenuation A

f = 27MHz 39 41 dB

Boost Amplitude f = 4.2MHz, MAX7444

Differential Gain dG

5-step modulated staircase

Gain = 6dB,

9.5dB, 12dB

Differential Phase dθ

5-step modulated staircase

Gain = 6dB,

9.5dB, 12dB

Degrees

Signal-to-Noise Ratio SNR

Peak signal (2V

P-P

) to RMS noise, f = 100Hz to 50MHz

Gain = 6dB,

9.5dB, 12dB

67 73 dB

MAX7443 8 20

Group Delay Deviation ∆t

Deviation from 100kHz to

4.1MHz

MAX7444 12 30

Line-Time Distortion H

DIST

18µs, 100 IRE bar

Field-Time Distortion V

DIST

130 lines, 18µs, 100 IRE bar

Clamp Settling Time To ±1%

Lines

YOUT

CVOUT

Output DC Clamp Level

COUT

Low-Frequency Gain Accuracy A

f = 100kHz, relative to 6dB

+2 %

Group Delay Matching

f = 100kHz for YOUT and COUT

2ns

Channel-to-Channel Crosstalk X

TALK

f = 100kHz to 3.58MHz, gain = 6dB 61 dB

Input Leakage Current I

10 µA

SYMBOL

MIN TYP MAX

-0.8 -0.3 +0.1

-0.1 +0.6 +0.92

0.6

0.15 0.4

tg(MATCH)

Low-frequency channel-to-channel matching,

0.6 0.8 1.0

1.44 1.6 1.97

-3.5

0.15 0.4

0.3

0.5

430

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= 75Ω to GND for DC-couple, RL= 75Ω to VCC/2 for AC-couple, C

YIN

= C

CIN

= 0.1µF,

= T

MIN

to T

MAX

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

INP-P

GSET = GND (6dB)

Input Dynamic Swing

INP-P

GSET = GND (6dB)

P-P

SUPPLY

Supply Voltage Range V

Supply Current I

VCC = +5.25V, no load 88

Power-Supply Rejection Ratio PSRR V

= 100mV

P-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

200mV/div

OUT

400mV/div

MODULATED 12.5T RESPONSE

(1 IRE = 7.14mV)

MAX7443/44 toc06

400ns/div

200mV/div

OUT

200mV/div

4.75 5.25

1.2

0.9

110

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