Rainbow Electronics MAX7463 User Manual

General Description

The MAX7462/MAX7463 single-channel, standard-defini­tion, integrated video reconstruction filters and buffers
are ideal for anti-aliasing and digital-to-analog smoothing
video applications or wherever analog video is recon­structed from digital data (such as cable/satellite/terres­trial set-top boxes and DVRs).

The MAX7462 includes a disable function, which
places the output in a high-impedance state allowing
multiplexing of multiple output signals. It also has an
external gain control that sets the output buffer gain to
either +6dB or +9.5dB. The higher gain setting allows a
lower DAC output signal than the standard 1V

P-P

sig­nal. The MAX7463 output buffer has a fixed gain of
+6dB.

The MAX7462/MAX7463 operate from a single +5V
supply and have a flat passband out to 5MHz with a
stopband attenuation of -43dB (typ) at 27MHz.

These devices can drive two standard 150Ω AC-cou­pled or DC-coupled video loads. The output black level
of the MAX7462/MAX7463 is less than 1V for DC-cou­pled outputs.

The MAX7462 is available in an 8-pin µMAX

®

package
and an 8-pin SO package. The MAX7463 is available in
an 8-pin SO package. All devices are specified over
the 0°C to +85°C temperature range.

Applications

Cable/Satellite/Terrestrial Set-Top Boxes

DVRs

Hard-Disk Recorders

Features

♦ Standard-Definition CVBS Video Reconstruction

Filters and Buffers

♦ Passband: -0.05dB at 5MHz

♦ Stopband: -43dB at 27MHz

♦ Selectable Gain: +6dB and +9.5dB (MAX7462)

♦ Output Disable (MAX7462)

♦ Drives 2V

P-P

into Two 150Ω Video Loads

♦ Output Black Level < 1V for DC-Coupled Output

♦ Very Small µMAX and SO Packages

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters

and Buffers

________________________________________________________________ Maxim Integrated Products 1

19-3790; Rev 0; 8/05

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.

Ordering Information

Note: All parts are specified over the 0°C to +85°C temperature
range.
*Future product—contact factory for availability.

µMax is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

75Ω

75Ω

220µF

220µF

*

*

Z

O

= 75Ω

Z

O

= 75Ω

75Ω

75Ω

OUT

+6dB/+9.5dB

GAIN

DISABLE

GND

LOWPASS

FILTER

V

CC

+5V

DAC

IN

0.1µF

MAX7462

*OPTIONAL

Functional Diagram

PART

MAX7462UUA* 8 µMAX

MAX7462USA* 8 SO

MAX7463USA 8 SO +6 fixed No

PIN­PACKAGE

BUFFER GAIN

(dB)

+6/+9.5

selectable

+6/+9.5

selectable

OUTPUT

DISABLE

Yes

Yes

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters
and Buffers

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 ........................................................................+6.0V

All Other Pins to GND ...-0.3V to the lower of (V

CC

+ 0.3V) and +6V

Maximum Current into Any Pin Except V

CC

and GND .....±50mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin µMAX (derate 4.5mW/°C above +70°C) …...... 362mW

8-Pin SO (derate 5.9mW/°C above +70°C) .......... 470.6mW

Operating Temperature Range...............................0°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

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

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, CL= 0 to 20pF, RL= 75Ω, CIN= 0.1µF, gain = +6dB, DISABLE = VCC(MAX7462), TA=T

MIN

to T

MAX

, unless other-

wise noted. Typical values are at V

CC

= +5V, and TA= +25°C.)

Note 1: Measured after 75Ω back-match resistor. Assume a 75Ω termination resistor.

Passband Response f = 100kHz to 5MHz, relative to 100kHz -0.65 -0.05 +0.65 dB

Stopband Attenuation f ≥ 27MHz 39 43 dB

Output Dynamic Swing Gain = GND (MAX7462) 2.0 2.4 V

Output Sync Tip Clamp Level After termination (Note 1) 0.30 0.45 0.55 V

Group Delay Deviation f = 100kHz to 4.2MHz 11 ns

Differential Gain Five-step modulated staircase 0.15 %

Differential Phase Five-step modulated staircase 0.15 Degrees

Signal-to-Noise Ratio Output signal (2V

Low-Frequency Gain Accuracy f =100kHz, relative to a gain of +6dB -3 +3 %

Line Time Distortion 18µs, 100 IRE bar 0.1 %

Field Time Distortion 130 lines, 18µs, 100 IRE bar 0.1 %

Power-Supply Rejection Ratio VIN = 100mV

Supply Current No load 25 35 mA

PARAMETER CONDITIONS MIN TYP MAX UNITS

P-P

, f = 100kHz 35 dB

P-P

) to RMS noise (100Hz to 5MHz) 75 dB

P-P

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters

and Buffers

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(VCC= +5V ±5%, CL= 0 to 20pF, RL= 75Ω, CIN= 0.1µF, gain = +6dB, DISABLE = VCC(MAX7462), TA=T

MIN

to T

MAX

, unless other-

wise noted. Typical values are at V

CC

= +5V, and TA= +25°C.)

0

-20

-40

AMPLITUDE (dB)

-60

NORMALIZED TO 0dB

-80

0.1 100

200

150

100

50

0

-50

PHASE (DEGREES)

-100

-150

-200

0.1 10

AMPLITUDE vs. FREQUENCY

101

FREQUENCY (MHz)

PHASE RESPONSE

vs. FREQUENCY

1

FREQUENCY (MHz)

MAX7462/63 toc01

MAX7462/63 toc03

PASSBAND AMPLITUDE

vs. FREQUENCY

2.0

1.5

1.0

0.5

0

-0.5

AMPLITUDE (dB)

-1.0

-1.5
NORMALIZED TO 0dB

-2.0

0.1 10

1

FREQUENCY (MHz)

GROUP DELAY vs. FREQUENCY

100

90

80

70

GROUP DELAY (ns)

60

50

0.1 10

1

FREQUENCY (MHz)

MAX7462/63 toc02

MAX7462/63 toc04

2T RESPONSE

200ns/div

MAX7462/63 toc05

OUT
250mV/div

IN
250mV/div

MODULATED 12.5T RESPONSE

200ns/div

MAX7462/63 toc06

OUT
250mV/div

IN
250mV/div

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters
and Buffers

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= +5V ±5%, CL= 0 to 20pF, RL= 75Ω, CIN= 0.1µF, gain = +6dB, DISABLE = VCC(MAX7462), TA=T

MIN

to T

MAX

, unless other-

wise noted. Typical values are at V

CC

= +5V, and TA= +25°C.)

2ms/div

OUT RESPONSE TO A FIELD

SQUARE WAVE

OUT
500mV/div

MAX7462/63 toc10

IN
500mV/div

100ns/div

DISABLE TURN-ON TIME

OUT
1V/div

MAX7462/63 toc11

DISABLE

2V/div

GND

GND

100ns/div

OUT

1V/div

MAX7462/63 toc12

DISABLE

2V/div

GND

GND

DISABLE TURN-OFF TIME

10µs/div

MULTIBURST RESPONSE

OUT
250mV/div

MAX7462/63 toc09

IN
250mV/div

10

20

30

40

SUPPLY CURRENT vs. TEMPERATURE

MAX7462/63 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

01734 85

VIN = +2V
NO LOAD

51 68

DIFFERENTIAL GAIN

MAX7462/63 toc08

DIFFERENTIAL PHASE (deg)

1324567

1324567

0.4

0.6

0.2
0

-0.2

-0.4

-0.6

DIFFERENTIAL GAIN (%)

0.2

0.3

0.1
0

-0.1

-0.2

-0.3

DIFFERENTIAL PHASE

Detailed Description

The MAX7462/MAX7463 filters and buffers the analog
CVBS video outputs of DAC video-encoders in applica­tions such as set-top boxes, hard-disk recorders, DVD
players, and digital VCRs. The MAX7462/MAX7463 con­sist of a lowpass filter and an output video buffer that can
drive two standard 150Ω video loads. These devices
operate from a single +5V supply and have a bandwidth
optimized for interlaced NTSC, PAL, and SDTV.

Filter

The reconstruction filter is a 4th-order Butterworth-type
response that features a maximally flat passband for
NTSC and PAL bandwidths. The stopband attenuation
is optimized for a video-encoder DAC sampling fre­quency of 27MHz (see the Typical Operating
Characteristics).

Output Buffer

The output buffer can drive two 150Ω video loads with
a 2V

P-P

signal. For the MAX7462, the output buffer gain
is selectable between +6dB and +9.5dB by using GAIN
(see Table 1). The MAX7463 has a fixed gain of +6dB.

The MAX7462/MAX7463 can drive an AC load or drive
the video load directly without using a large output

capacitor. The output buffer can drive DC loads while
maintaining an output blanking level of less than 1V. The
blanking level allows the MAX7462/MAX7463 to meet the
digital TV interface specifications for DC coupling.

Applications Information

Input Considerations

Use a 0.1µF ceramic capacitor to AC-couple the input.
The input capacitor stores a DC voltage so that the out­put is clamped to the appropriate DC voltage level.

Output Considerations

The outputs 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 on the video cable is always
less than 1V, complying with industry-standard video
requirements such as the digital TV standard (which
allows up to 1VDC on the video cable) and the
European SCART standard (which allows up to 2VDC
on the video cable). 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 MAX7462/MAX7463 operate from a single +5V
supply. Bypass V

CC

to GND with a 0.1µF capacitor. In
addition, it is sometimes advantageous to connect a
10µF capacitor within the general vicinity of the video
circuitry. Place all other external components as close
to the device as possible.

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters

and Buffers

_______________________________________________________________________________________ 5

Pin Description

Table 1. Gain Setting Control (MAX7462)

PIN

MAX7462 MAX7463

11IN Video Input. AC-couple IN with a series 0.1µF capacitor.

2—GAIN

3, 4, 5 3 GND Ground

— 2, 4, 5, 6 N.C. No Connection. Not internally connected. Connect to GND for better performance.

6—DISABLE

77VCC+5V Supply Input

88OUT

GAIN BUFFER GAIN (dB)

GND +6

V

CC

NAME FUNCTION

Gain Control Input. Connect GAIN to GND for a gain of +6dB (+2V/V). Connect GAIN to V
for a gain of +9.5dB (+3V/V).

Disable Input. Connect to V
to put the output buffer in a high-impedance state.

Buffer Output. This output can be either AC- or DC-coupled. Use at minimum a 220µF
capacitor for AC-coupled loads.

to enable the output buffer (normal operation). Connect to GND

CC

+9.5

CC

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters
and Buffers

6 _______________________________________________________________________________________

Chip Information

PROCESS: BiCMOS

DISABLE

GNDGND

1

2

87OUT

V

CC

GAIN

GND

IN

TOP VIEW

3

4

6

5

MAX7462

N.C.

N.C.N.C.

1

2

87OUT

V

CC

N.C.

GNDIN3

4

6

5

MAX7463

Pin Configurations

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters

and Buffers

_______________________________________________________________________________________ 7

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

.)

8

Ø0.50±0.1

0.6±0.1

0.6±0.1

1

D

TOP VIEW

A2

E H

A1

4X S

BOTTOM VIEW

A

8

1

DIM

A
A1
A2
b

c
D
e

E

H

L

α

S

INCHES

MIN

-

0.002

0.030

0.010

0.005

0.116

0.0256 BSC

0.116

0.188

0.016
0∞

0.0207 BSC

MAX

0.043

0.006

0.037

0.014

0.007

0.120

0.120

0.198

0.026
6∞

MILLIMETERS

MIN

0.05 0.15

0.25 0.36

0.13 0.18

2.95 3.05

2.95 3.05

4.78

0.41

MAX

- 1.10

0.950.75

0.65 BSC

5.03

0.66

0.5250 BSC

6∞0∞

8LUMAXD.EPS

e

FRONT VIEW

c

b

L

SIDE VIEW

α

PROPRIETARY INFORMATION

TITLE:

PACKAGE OUTLINE, 8L uMAX/uSOP

REV.DOCUMENT CONTROL NO.APPROVAL

21-0036

1

J

1

MAX7462/MAX7463

Single-Channel Video Reconstruction Filters
and Buffers

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

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

Boblet

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

.)

N

HE

1

e

TOP VIEW

D

A

B

A1

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

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

C

L

0∞-8∞

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

SIDE VIEW

PROPRIETARY INFORMATION

TITLE:

PACKAGE OUTLINE, .150" SOIC

REV.DOCUMENT CONTROL NO.APPROVAL

21-0041

1

B

1