Maxim MAX7453, MAX7453CSA Datasheet

General Description

The MAX7453 is a low-cost, triple-channel video recon­struction filter for S-video and CVBS video-signal appli­cations. This device is ideal for anti-aliasing and DAC
smoothing video applications such as set-top boxes,
DVD players, hard-disk recorders (HDRs), and personal
video recorders. This filter operates from a single +5V
supply. It is optimized for NTSC, PAL, and standard-defi­nition TV (SDTV) video systems.

Each channel consists of a lowpass filter and an output
buffer capable of driving one (YOUT, COUT) or two
(CVOUT) 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 MAX7453 has a maxi­mally flat frequency response.

The MAX7453 is available in an 8-pin SO package and is
fully specified over the commercial (0°C to +70°C) tem­perature range.

Applications

Set-Top Boxes/HDRs/DVDs

Security Cameras/Digital Cameras

Game Consoles

Digital VCRs

Every Composite, S-Video Output for NTSC,
PAL, and SDTV

Features

♦ Triple-Channel Filter and Buffer for CVBS and

Y/C (S-Video) Video Signals

♦ Filter Response Ideal for NTSC, PAL, and

Interlaced SDTV Signals

♦ 42dB (typ) Stopband Attenuation at 27MHz

♦ -0.3dB (typ) Passband Response

♦ <1V Blanking Level Allows DC-Coupled Output

♦ CVOUT Drives Two 150Ω Video Loads

♦ YOUT and COUT Drive One 150Ω Video Load

♦ +5V Single-Supply Voltage

♦ 8-Pin SO Package

MAX7453

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

________________________________________________________________ Maxim Integrated Products 1

19-3269; Rev 0; 6/05

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.

D/A

CIN

LOWPASS

FILTER

LOWPASS

FILTER

YIN

D/A

Σ

COUT

CVOUT

YOUT

*

GND

V

CC

*

*

*

ENCODER

MAX7453

+6dB

+6dB

+6dB

Functional Diagram

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX7453CSA 0°C to +70°C 8 SO

Pin Configuration

TOP VIEW

YIN

N.C.

GND

1

2

MAX7453

3

4

SO

87YOUT

V

CC

CVOUT

6

COUTCIN

5

MAX7453

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

CC

+ 0.3V)

Maximum Current into Any Pin Except V

CC

and GND .....±50mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO ....................................................................522.8mW

Operating Temperature Range...............................0°C to +70°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, all loads to GND for DC-couple, all loads to V

CC

/ 2 for AC-couple, C

YIN

= C

CIN

= 0.1µF,

R

YOUT

= 150Ω, R

COUT

= 150Ω, R

CVOUT

= 75Ω, TA= T

MIN

to T

MAX

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

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

0dB

Stopband Attenuation A

SB

f = 27MHz 39 42 dB

Chroma/Luma Gain f = 3.58MHz, reference to CVOUT at 336kHz 96 98

%

Differential Gain dG 5-step modulated staircase

%

Differential Phase dθ 5-step modulated staircase

Degrees

Signal-to-Noise Ratio SNR

Peak signal (2V

P-P

) to RMS noise,

f = 100Hz to 50MHz

67 73 dB

Line-Time Distortion H

DIST

18µs, 100IRE bar

%

Field-Time Distortion V

DIST

130 lines, 18µs, 100IRE bar

%

Clamp Settling Time To ±1%

Lines

YOUT

CVOUT

Output DC Clamp Level

COUT

V

Low-Frequency Gain Accuracy A

V

f = 100kHz, relative to 6dB

%

Group-Delay Deviation ∆t

g

Deviation from 100kHz to 4.1MHz 8 16 ns

Group-Delay Matching

f = 100kHz for YOUT and COUT

2ns

Channel-to-Channel Crosstalk X

TALK

f = 100kHz to 3.58MHz 61 dB

Input Leakage Current I

IN

10 µA

Y

INP-P

Input Dynamic Swing

C

INP-P

V

P-P

SUPPLY

Supply Voltage Range V

CC

V

Supply Current I

CC

VCC = +5.25V, no load 65 85 mA

Power-Supply Rejection Ratio PSRR V

IN

= 100mV

P-P

, f = 0 to 3.5MHz 33 dB

-0.6 -0.27

0.15 0.5

0.15 0.5

100

tg(MATCH)

Low-frequency channel-to-channel matching,

0.3

0.5

300

0.60 0.8 0.95

0.60 0.8 0.95

1.44 1.6 1.95

-3.0 +2.0

4.75 5.25

1.2

0.9

MAX7453

Triple-Channel Video Reconstruction Filter and

Buffer for Composite and Y/C Outputs

_______________________________________________________________________________________ 3

AMPLITUDE vs. FREQUENCY

MAX7453 toc01

FREQUENCY (MHz)

AMPLITUDE (dB)

10

-70

-60

-50

-40

-30

-20

-10

0

10

-80
1 100

NORMALIZED TO 0dB

PASSBAND AMPLITUDE vs. FREQUENCY

MAX7453 toc02

FREQUENCY (MHz)

AMPLITUDE (dB)

1

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

1.0

-3.0

0.1 10

NORMALIZED TO 0dB

PHASE RESPONSE vs. FREQUENCY

MAX7453 toc03

FREQUENCY (MHz)

PHASE (DEGREES)

1

-240

-200

-160

-120

-80

-40

0

40

-280

0.1 10

GROUP DELAY vs. FREQUENCY

MAX7453 toc04

FREQUENCY (MHz)

GROUP DELAY (ns)

1

50

55

60

65

70

75

80

85

90

40

45

0.1 10

2T RESPONSE (1IRE = 7.4mV)

MAX7453 toc05

100ns/div

YIN
200mV/div

YOUT
200mV/div

MEASURE AT
TERMINATION

MODULATED 12.5T RESPONSE

(1IRE = 7.14mV)

MAX7453 toc06

400ns/div

YIN
500mV/div

YOUT
500mV/div

MEASURE AT TERMINATION

SUPPLY CURRENT vs. TEMPERATURE

MAX7453 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

603510-15

52

54

56

58

60

62

64

66

68

70

50

-40 85

DIFFERENTIAL GAIN

DIFFERENTIAL PHASE

MAX7453 toc08

DIFFERENTIAL GAIN (%)

-0.3

-0.2

0.2

-0.1

0.1
0

0.3

1st 2nd 3rd 4th 5th 6th

DIFFERENTIAL PHASE (DEGREES)

-0.3

-0.2

0.2

-0.1

0.1
0

0.3

1st 2nd 3rd 4th 5th 6th

MULTIBURST RESPONSE

MAX7453 toc09

10µs/div

YIN
500mV/div

YOUT
500mV/div

MEASURED AT TERMINATION

Typical Operating Characteristics

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

Detailed Description

The primary function of the MAX7453 is to filter and
buffer the encoder DAC outputs that contain digital
video information in applications such as set-top boxes,
HDRs, DVD players, and digital VCRs. This device
reconstructs and cleans up analog video signals. The
MAX7453 consists of a lowpass filter and a +6dB-gain
output video buffer. 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 fea­tures a maximally flat passband for NTSC and PAL
bandwidths. The stopband offers 42dB (typ) of attenua­tion at sampling frequencies of 27MHz and above (see
the Typical Operating Characteristics).

Output Buffer

The YOUT and COUT buffers have a fixed +6dB gain
capable of driving one standard 150Ω video load with a
2V

P-P

signal. The CVOUT buffer has a fixed +6dB gain,
capable of driving two 150Ω video loads. The MAX7453
can drive an AC load or drive the video load directly
without using the large output capacitor. The output
buffer of all the channels drives a DC load with an out­put blanking level of less than 1V.

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 to
set 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 MAX7453. 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 MAX7453 are typically connected to
a 75Ω series back-match resistor followed 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 MAX7453 operates from a single +5V supply.
Bypass VCCto GND with a 0.1µF capacitor. Place all
external components as close to the device as possible.
The maximum power dissipation listed in the Absolute
Maximum Ratings section assumes that the PC board is
a multilayer board with ground and power planes.

Chip Information

TRANSISTOR COUNT: 4100

PROCESS: BiCMOS

PIN

NAME

FUNCTION

1 YIN Luma (Y) Input

2N.C.

No Connection. No internal connection.

3 GND Ground

4 CIN Chroma (C) Input

5

Chroma (C) Output

6

Composite Video Output

7VCC5V Power Supply

8

Luma (Y) Output

Pin Description

MAX7453

Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs

4 _______________________________________________________________________________________

COUT

CVOUT

YOUT

MAX7453

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5

© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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

.)

SOICN .EPS

PACKAGE OUTLINE, .150" SOIC

1

1

21-0041

B

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

TOP VIEW

FRONT VIEW

MAX

0.010

0.069

0.019

0.157

0.010

INCHES

0.150

0.007

E

C

DIM

0.014

0.004

B

A1

MIN

0.053A

0.19

3.80 4.00

0.25

MILLIMETERS

0.10

0.35

1.35

MIN

0.49

0.25

MAX

1.75

0.050

0.016L

0.40 1.27

0.3940.386D

D

MINDIM

D

INCHES

MAX

9.80 10.00

MILLIMETERS

MIN

MAX

16

AC

0.337 0.344 AB8.758.55 14

0.189 0.197 AA5.004.80 8

N MS012

N

SIDE VIEW

H 0.2440.228 5.80 6.20

e 0.050 BSC 1.27 BSC

C

HE

e

B

A1

A

D

0∞-8∞

L

1

VARIATIONS: