Rainbow Electronics MAX7442 User Manual

General Description

The MAX7440/MAX7441/MAX7442 six-channel video
reconstruction filters replace 30 or more discrete com­ponents. The devices are ideal for digital-to-analog
converter (DAC) video reconstruction applications,
when analog video is reconstructed from a digital data
stream. The MAX7440/MAX7441/MAX7442 operate
from a single +5V power supply. The inputs are DC­coupled from the DAC and the output can either be AC­or DC-coupled. The DC-IN, DC-OUT architecture, leads
to a perfect line-time distortion performance (zero tilt).
The filters have a cutoff frequency optimized for PAL,
NTSC, and SDTV video applications and offer three
high-frequency boost options. The MAX7440 offers a
flat passband response on all six channels; the
MAX7441/MAX7442 offer high-frequency boost on the
three channels used for CVBS and Y/C. The MAX7440/
MAX7441/MAX7442 are available in a 14-pin SO pack­age and are fully specified over the extended tempera­ture range.

Applications

Features

♦ Replace 30 or More Discrete Components

♦ Ideal for CVBS, Y/C (S-Video), and RGB or Y Pb Pr

Applications

♦ 45dB Attenuation at 27MHz

♦ -0.2dB Passband Response

♦ Ideal for STBs with SCART Interface

♦ +5V Single-Supply Voltage

♦ Input Common-Mode Range Includes GND

♦ DC-Coupled Input, DC/AC-Coupled Output

♦ 14-Pin SO Package

MAX7440/MAX7441/MAX7442

6-Channel Integrated Video Reconstruction

Filters

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2750; Rev 0; 1/03

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.

*Future product—contact factory for availability.

75Ω

75Ω

A/V SWITCHING

DEVICE (MAX4399)

OR BUFFERS

OUT1

IN1

+5V

0.1µF1µF

LOWPASS FILTER
WITH HF BOOST*

A = +1V/V

D/A

ENCODER

75Ω

OUT2

IN2

LOWPASS FILTER

A = +1V/V

D/A

75Ω

OUT3

IN3

LOWPASS FILTER

A = +1V/V

D/A

75Ω

OUT4

IN4

LOWPASS FILTER

A = +1V/V

D/A

75Ω

OUT5

IN5

LOWPASS FILTER
WITH HF BOOST*

A = +1V/V

D/A

75Ω

OUT6

*MAX7440 HAS FLAT RESPONSE, MAX7441/MAX7442 INCLUDES HF BOOST.

IN6

LOWPASS FILTER
WITH HF BOOST*

A = +1V/V

D/A

75Ω

75Ω

75Ω

75Ω

75Ω

MAX7440
MAX7441
MAX7442

Typical Application Circuit

STB

DVDs

Hard Disk Recorders

PVR

SCART Video Applications

General Video Filtering

PART TEMP RANGE

MAX7440ESD -40°C to +85°C 14 SO No

MAX7441ESD -40°C to +85°C 14 SO Yes

MAX7442ESD* -40°C to +85°C 14 SO Yes

PIN­PACKAGE

H IG H -

F R EQ U EN C Y

B O O ST

MAX7440/MAX7441/MAX7442

6-Channel Integrated Video Reconstruction
Filters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, RL= 5kΩ, CL= 0 to 20pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at 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 .........................................±50mA

Continuous Power Dissipation (T

A

= +70°C)

14-Pin SO (derate 8.3mW/°C above +70°C)..............666.7mW

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

Passband Response

Stopband Attenuation A

Boost Amplitude f = 4.5MHz

Differential Gain dG 5-step modulated staircase 0.05 %

Differential Phase dB 5-step modulated staircase 0.05 Degrees

Signal-to-Noise Ratio SNR

Group Delay Matching tg(MATCH)

Group Delay Deviation ∆

Line-Time Distortion H

Field-Time Distortion V

Low-Frequency Gain Variation A

Low-Frequency Gain 0.975 V/V

Low-Frequency Gain Matching t

Input Voltage Range 0 1.75 V

Channel-to-Channel Crosstalk X

Input Leakage Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

sb

g

dist

dist

V

g

TALK

IN

DC to 3.5MHz, MAX7440/MAX7441
(channels 2, 3, 4)

DC to 5MHz, MAX7440/MAX7441
(channels 2, 3, 4)

f = 27MHz 37 45 dB

Peak signal (1V
to 100MHz

Low-frequency
channel-to-channel
matching,
f = 200kHz

Deviation from
100kHz to 4.5MHz

18µs, 100IRE bar -3 0 +3 mV

130 lines, 18µs, 100IRE bar -4 +4 mV

Gain at f = 100kHz -0.25 +0.25 dB

f = 100kHz -3 +3 %

Channel-to-channel crosstalk, DC to 5MHz 71 dB

VIN = 0V 2 6 25 µA

-0.40 -0.2 +0.10

-0.80 -0.5 0

+1dB HF boost,
MAX7441

+2dB HF boost,
MAX7442

) to RMS noise, f = 10Hz

P-P

Channels 2, 3, 4 2

Channels 1, 5, 6 2

MAX7440/MAX7441/
MAX7442

MAX7441 (channels
1, 5, 6)

MAX7442 (channels
1, 5, 6)

0.4 0.60 0.91

1.2

71 dB

10

17

17

dB

dB

ns

ns

MAX7440/MAX7441/MAX7442

6-Channel Integrated Video Reconstruction

Filters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, RL= 5kΩ, CL= 0 to 20pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

0

-70

0.1 1 10 100

AMPLITUDE vs. FREQUENCY

-50

-60

MAX7440 toc01

FREQUENCY (MHz)

AMPLITUDE (dB)

-40

-30

-20

-10

PASSBAND AMPLITUDE vs. FREQUENCY

MAX7440 toc02

FREQUENCY (MHz)

AMPLITUDE (dB)

1

-8

-6

-4

-2

0

2

-10

0.1 10

PHASE RESPONSE vs. FREQUENCY

MAX7440 toc03

FREQUENCY (MHz)

PHASE (DEGREES)

1

-150

-100

-50

0

50

100

150

200

-200

0.1 10

80

40

0.1 1 10

GROUP DELAY vs. FREQUENCY

50

MAX7440toc04

FREQUENCY (MHz)

GROUP DELAY (ns)

60

70

MAX7441
(CHANNELS 2, 3, 4)

200ns/div

2T RESPONSE (1IRE = 7.14mV)

IN_

200mV/div

MAX7440 toc05

OUT_

200mV/div

400ns/div

MODULATED 12.5T RESPONSE

(1IRE = 7.14mV)

IN_

200mV/div

MAX7440 toc06

OUT_

200mV/div

Typical Operating Characteristics

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Resistance 200 kΩ

Input Capacitance 20 pF

Supply Voltage Range V

Supply Current I

CC

CC

Power-Supply Rejection Ratio PSRR VIN = 100mV

DC Level Shift OUT_ to IN_ 0.85 1.05 V

4.75 5.25 V

VCC = +5.5V, no load 57 78 mA

P-P

DC 39

f = 0 to 1MHz 30

dB

MAX7440/MAX7441/MAX7442

6-Channel Integrated Video Reconstruction
Filters

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

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

50

54

52

58

56

60

62

-40 10-15 35 60 85

SUPPLY CURRENT

vs. TEMPERATURE

MAX7440 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

0

10

30

20

40

50

1.8 2.12.0 2.21.9 2.3

2.4

2.5

GROUP DELAY MATCHING DISTRIBUTION

MAX7440 toc11

GROUP DELAY (ns)

PERCENTAGE OF UNITS (%)

20 SAMPLES

-65

-90

0.1 1 10

CHANNEL-TO-CHANNEL CROSSTALK

vs. FREQUENCY

-85

MAX7440toc10

FREQUENCY (MHz)

AMPLITUDE (dB)

-75

-80

-70

0.3

0.2

0.1
0

-0.1

-0.2

-0.3

DIFFERENTIAL GAIN (%)

1324567

DIFFERENTIAL PHASE

DIFFERENTIAL GAIN

0.3

0.2

0.1
0

-0.1

(DEGREES)

-0.2

-0.3

DIFFERENTIAL PHASE

1324567

SIGNAL SWING vs. LOAD

4.5

4.0

MAX7440 toc08

3.5

)

P-P

3.0

2.5

2.0

SIGNAL SWING (V

1.5

1.0

0.5
200 18001000 2600 3400 4200 5000

LOAD (Ω)

INPUT/OUTPUT LEVEL SHIFT

vs. TEMPERATURE

950

910

870

MAX7440 toc09

MAX7440 toc12

OUT_

200mV/div

MULTIBURST RESPONSE

10µs/div

MAX7440 toc13

830

LEVEL SHIFT (mV)

790

750

-40 10-15 35 60 85
TEMPERATURE (°C)

MAX7440/MAX7441/MAX7442

6-Channel Integrated Video Reconstruction

Filters

_______________________________________________________________________________________ 5

Pin Description

Detailed Description

The MAX7440/MAX7441/MAX7442 filter the outputs of
DAC encoder chipsets that process digital video infor­mation in applications such as set-top boxes, hard disk
recorders, DVD players, DVD recorders, and digital
VCRs. These devices also filter and clean up analog
video signals by rejecting out-of-band noise. Each
channel in the MAX7440/MAX7441/MAX7442 includes
a 4th-order lowpass filter and a gain of +1V/V output
stage, as shown in the Typical Application Circuit.

Filter

Filter Response

Each channel of the reconstruction filter consists of a
4th-order Sallen-Key filter configured as two 2nd-order
stages. The filter features a maximally flat passband for
NTSC, PAL, and SDTV bandwidths. The stopband
offers typically 45dB of attenuation at sampling fre­quencies of 27MHz and above (see Typical Operating
Characteristics). The filter exhibits a Butterworth-type
response resulting in excellent group delay deviation
performance.

High-Frequency Boost

The high-frequency (HF) boost compensates for signal
degradation and rolloff in the signal path prior to the fil­ter. This performance increases the image sharpness.
The MAX7441/MAX7442 offer a high-frequency boost
on channels OUT1, OUT5, and OUT6.

Output Stage

The output stages of the MAX7440/MAX7441/MAX7442
are designed to drive 1V

P-P

signals into high-imped­ance (>5kΩ) loads. They require external buffers to
drive standard video cables. Most standard audio/
video switching devices include these buffers for STB
applications.

Applications Information

MAX7440/MAX7441/MAX7442 with an A/V

Switching Device

The MAX7440/MAX7441/MAX7442 are designed to
directly interface to an audio/video switching device
used in video applications (i.e., STBs) with SCART
interfaces (see Typical Application Circuit). The output
of the analog filters can drive the high-impedance load
of the switching device. The switching device provides
the buffering to drive standard 150Ω video loads.

MAX7440/MAX7441/MAX7442 with

External Buffers

External buffering is required for the MAX7440/
MAX7441/MAX7442 to drive standard 150Ω video
loads. Figure 1 shows the MAX4394 triple op amp, con­figured with a gain of +2V/V to drive standard video
loads from the MAX7440/MAX7441/MAX7442.

PIN NAME FUNCTION

1 IN1 Channel 1 Filter Input (Optional Boosted Channel)

2 IN2 Channel 2 Filter Input

3 IN3 Channel 3 Filter Input

4VCC+5V Power Supply. Bypass to GND with a 0.1µF and 1µF capacitor.

5 IN4 Channel 4 Filter Input

6 IN5 Channel 5 Filter Input (Optional Boosted Channel)

7 IN6 Channel 6 Filter Input (Optional Boosted Channel)

8 OUT6 Channel 6 Filter Output

9 OUT5 Channel 5 Filter Output

10 OUT4 Channel 4 Filter Output

11 GND Ground

12 OUT3 Channel 3 Filter Output

13 OUT2 Channel 2 Filter Output

14 OUT1 Channel 1 Filter Output

MAX7440/MAX7441/MAX7442

Power-Supply Bypassing and Layout

The MAX7440/MAX7441/MAX7442 operate from a sin­gle +5V supply. Bypass VCCto GND with a 0.1µF and
1µF capacitor. These capacitors filter all frequencies
over 1MHz. Place all external components as close to
the devices as possible. To maintain good crosstalk
performance ensure that input and output lines do not
run parallel for any distance. If it is necessary to have
parallel lines, run a ground trace in between each line.
Refer to the MAX7440 Evaluation Kit for a proven PC
board layout example.

Chip Information

TRANSISTOR COUNT: 3691

PROCESS: BiCMOS

6-Channel Integrated Video Reconstruction
Filters

6 _______________________________________________________________________________________

Figure 1. Typical Application Circuit with External Buffers

Pin Configuration

V

+5V

CC

0.1µF1µF

ENCODER

MAX7440
MAX7441
MAX7442

D/A

D/A

IN1

IN6

LOWPASS FILTER

LOWPASS FILTER

A = +1V/V

A = +1V/V

OUT1 IN

OUT6

510Ω

IN

510Ω

DISABLE

MAX4394

510Ω

DISABLE

MAX4394

510Ω

75Ω

75Ω

Z

Z

= 75Ω

O

= 75Ω

O

OUT1

75Ω

OUT6

75Ω

TOP VIEW

IN1

IN2

IN3

IN4

IN5

1

2

3

4

5

6

7

MAX7440
MAX7441
MAX7442

CC

14

OUT1

13

OUT2

12

OUT3

11

GNDV

OUT4

10

9

OUT5

OUT6IN6

8

SO

MAX7440/MAX7441/MAX7442

6-Channel Integrated Video Reconstruction

Filters

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.

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

© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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

.)

N

1

TOP VIEW

D

e

FRONT VIEW

INCHES

DIM

MIN

0.053A

0.004

A1

0.014

B

0.007

C
e 0.050 BSC 1.27 BSC

0.150

HE

A

B

A1

C

L

E
H 0.2440.228 5.80 6.20

0.016L

VARIATIONS:

INCHES

MINDIM

D

0.189 0.197 AA5.004.80 8

0.337 0.344 AB8.758.55 14

D

0-8

SIDE VIEW

MAX

0.069

0.010

0.019

0.010

0.157

0.050

MAX

0.3940.386D

MILLIMETERS

MAX

MIN

1.35

1.75

0.10

0.25

0.35

0.49

0.19

0.25

3.80 4.00

0.40 1.27

MILLIMETERS

MAX

MIN

9.80 10.00

N MS012

16

AC

SOICN .EPS

PROPRIETARY INFORMATION

TITLE:

PACKAGE OUTLINE, .150" SOIC

REV.DOCUMENT CONTROL NO.APPROVAL

21-0041

1

B

1