MAXIM MAX11500 Technical data

General Description

The MAX11500 integrated three-channel high-definition
(HD) video filter includes input video clamps and output
buffers. This device is ideal for anti-aliasing and DAC
smoothing video applications such as set-top boxes,
hard-disk recorders (HDRs), DVD players, and person­al video recorders.

The 6th-order channel filters have a typical -3dB band­width of 33MHz. Each channel has an output buffer with
a gain of +6dB and can drive a full 2V

P-P

video signal
into one standard 150Ω video load. These buffers can
drive either an AC- or DC-coupled load such that the
blanking level voltage after the backmatch resistor is
less than 1V.

The video inputs feature a transparent clamp for AC­and DC-coupled input signals. If the input signal does
not go below ground, the input clamp is inactive, thus
enabling DAC outputs to be DC-coupled to the input.

The device operates from a single +5V supply, is offered
in the upper commercial 0°C to +85°C temperature
range, and is available in a small 8-pin SO package.

Applications

High-Definition Set-Top Box Receivers

HD Television Sets

HD Recorders

DVD Players

Personal Video Recorders

Video-On-Demand

Features

♦ Three-Channel 6th-Order Filter for High-Definition

Video

♦ +6dB Output Buffers

♦ Transparent Input Clamps

♦ AC- or DC-Coupled Inputs

♦ AC- or DC-Coupled Outputs

♦ Output Buffers Drive One Standard 150Ω Video

Load

♦ 12kV HBM ESD Protection on Outputs

♦ Single +5V Power Supply

♦ Small 8-Pin SO package

MAX11500

Three-Channel, High-Definition Video Filter

________________________________________________________________

Maxim Integrated Products

1

OUT3

GNDV

CC

1

2

87OUT1

OUT2IN2

IN3

IN1

SO

+

TOP VIEW

3

4

6

5

MAX11500

Pin Configuration

IN1

OUT1

GND

V

CC

33MHz

TRANSPARENT

CLAMP

+6dB

IN2

OUT2

33MHz

TRANSPARENT

CLAMP

+6dB

IN3

OUT3

33MHz

TRANSPARENT

CLAMP

+6dB

MAX11500

Typical Operating Circuit

19-3212; Rev 0; 1/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

+

Denotes a lead-free package.

PART

PIN-

PKG

CODE

8 SO S8-2

EVALUATION KIT

AVAILABLE

TEMP RANGE

MAX11500USA+ 0°C to +85°C

PACKAGE

MAX11500

Three-Channel, High-Definition Video Filter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +5V, R

LOAD

= 150Ω to GND, CIN= 0.1µF, TA= 0°C to +85°C, unless otherwise specified. All frequency response is relative

to 100kHz.)

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.

Note 1: All devices are 100% production tested at TA= +25°C.

V

CC

to GND..............................................................-0.3V to +6V

All other pins to GND......-0.3V to the lower of (V

CC

+ 0.3V) and +6V

Continuous Power Dissipation (T

A

= +70°C)

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

Maximum Current into any Pin Except V

CC

and GND......±50mA

Operating Temperature Range

MAX11500USA ...................................................0°C to +85°C

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

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

Junction Temperature......................................................+150°C

PARAMETER

CONDITIONS MIN TYP

UNITS

-1dB Bandwidth f

1dB

TA = +25°C 23 30 MHz

-3dB Bandwidth f

3dB

33 MHz

f = 37.125MHz 6.5

f = 44.25MHz 15.5

Stopband Attenuation A

SB

f = 74.25MHz, TA = +25°C 32 48

dB

Low-Frequency Gain A

V

5.4 6.0 6.6 dB

Low-Frequency Gain
Matching

)

0.01 dB

Input Voltage Range V

IN

Referenced to GND if DC-coupled 1.7 V

V

OUT

= 1.4V

P-P

, f = 10MHz 0.15

V

OUT

= 1.4V

P-P

, f = 15MHz 0.2

Total Harmonic
Distortion

THD

V

OUT

= 1.4V

P-P

, f = 22MHz 0.8

%

Channel-to-Channel
Crosstalk

X

TALK

f = 1MHz -72 dB

Signal-to-Noise Ratio SNR

Peak signal (2V

P-P

) to RMS noise,

f = 100kHz to 30MHz

68 dB

Group Delay t

g

f = 100kHz 25 ns

∆t

g

f = 100kHz to 26MHz 8 ns

V

CC

4.75 5 5.25 V

Supply Current I

CC

No load 24 38 mA

SYMBOL

MAX

Group-Delay Deviation

Supply Voltage Range

A

V(MATCH

MAX11500

Three-Channel, High-Definition Video Filter

_______________________________________________________________________________________

3

MAGNITUDE RESPONSE

(PASSBAND AND STOPBAND)

MAX11500 toc01

FREQUENCY (MHz)

RESPONSE (dB)

101

-60

-40

-20

0

20

-80

0.1 100

MAGNITUDE RESPONSE

(PASSBAND)

MAX11500 toc02

FREQUENCY (MHz)

RESPONSE (dB)

101

4.5

5.0

5.5

6.0

6.5

7.0

7.5

8.0

4.0

0.1 100

GROUP DELAY

MAX11500 toc03

FREQUENCY (MHz)

DELAY (ns)

101

10

20

30

40

50

60

0

0.1 100

2T RESPONSE

MAX11500 toc04

40ns/div

200mV/div

200mV/div

HD MULTIBURST RESPONSE

(1MHz–10MHz)

MAX11500 toc05

4µs/div

200mV/div

200mV/div

HD MULTIBURST RESPONSE

(20MHz–30MHz)

MAX11500 toc06

4µs/div

200mV/div

200mV/div

Typical Operating Characteristics

(VCC= +5V, outputs AC-coupled with 220µF, R

LOAD

= 150Ω to GND, CIN= 0.1µF, TA= +25°C. All frequency response is relative to

100kHz.)

Detailed Description

The MAX11500 integrates three high-definition (HD)
video filters, each with a transparent input clamp, a 6th­order lowpass filter with a -3dB bandwidth of 33MHz,
and an output stage with a gain of 2V/V. The output sig­nal is offset by typically 550mV to optimize driver per­formance.

V

OUT

= 2 x VIN+ 0.55V

Typical voltage waveforms are shown in Figures 1 and 2.

Transparent Clamps

All inputs feature a transparent clamp that allows either
AC- or DC-coupling of the inputs. The clamp remains
inactive while the input signal is above ground, offering
true DC input coupling. If the signal goes below
ground, as is the case if it is AC-coupled, the clamp
sets the sync tip close to the ground level.

Input Coupling

The choice to AC- or DC-couple the input depends on
the video source. Many DACs have a current output
and are terminated to ground with a resistor; such sig­nals can be conveniently DC-coupled. In cases where
the DC level of the video signal is unknown or outside
of the specified input range of the MAX11500, such sig­nals require AC-coupling. Examples of the latter are
SCART inputs and DACs terminated to VCC.

DC-Coupled Inputs

If the input is DC-coupled, the voltage must remain
above zero but not exceed the maximum input voltage
of 1.7V (typical).

INPUT SIGNAL

0.3V

1.0V

0.0V

OUTPUT SIGNAL

1.15V

2.55V

0.55V

IN_ OUT_

MAX11500

Figure 1. Typical AC-Coupled Signal

MAX11500

Three-Channel, High-Definition Video Filter

4 _______________________________________________________________________________________4 _______________________________________________________________________________________

Pin Description

PIN

FUNCTION

1 IN1 Video Input Channel 1

2 IN2 Video Input Channel 2

3 IN3 Video Input Channel 3

4V

CC

Power Supply. Bypass to GND with 0.1µF
and 1µF capacitors.

5

Ground

6

Video Output Channel 3

7

Video Output Channel 2

8

Video Output Channel 1

NAME

GND

OUT3

OUT2

OUT1

AC-Coupled Inputs

If the input is AC-coupled, the transparent clamp will be
active and sets the sync tip or the lowest voltage of the
signal close to ground. This clamping behavior is
appropriate for unipolar signals such as Y, R, G, or B
with or without sync pulse (Figure 3).

For bipolar signals such as Pb, Pr signals, the AC-coupled
inputs should be biased to a fixed DC voltage to ensure
that the transparent clamp never turns on. A suitable
network that biases the input to typically 0.59V is shown
in Figure 4. The device has an input leakage current
(IL) of typically 0.5µA and thus the bias voltage is
derived as follows:

HD Filters

The internal filters are optimized to deliver a flat pass­band along with high stopband attenuation. The filter
characteristic has been chosen to provide an excellent
time-domain response with low overshoot. The typical

-3dB frequency of 33MHz guarantees low attenuation
in the passband, while at the same time allowing for a
typical attenuation of -48dB at 74.25MHz.

V

R

RR

VIxR

BCCL

( )=

+

−

2

12

1

MAX11500

Three-Channel, High-Definition Video Filter

_______________________________________________________________________________________ 5

INPUT SIGNAL

0.32V

1.02V

0.02V

0.00V

OUTPUT SIGNAL

1.19V

2.59V

0.59V

IN_ OUT_

MAX11500

Figure 2. Typical DC-Coupled Signal

IN_

MAX11500

0.1µF

ENCODER

DAC

Figure 3. AC-Coupling for Unipolar Signals (Y, R, G, B)

IN_

R1
820kΩ

R2
120kΩ

MAX11500

0.1µF

ENCODER

DAC

V

CC

Figure 4. AC-Coupling for Bipolar Signals (Pb, Pr)

MAX11500

Three-Channel, High-Definition Video Filter

6 _______________________________________________________________________________________

Output Buffer

The MAX11500 features output buffers with +6dB gain
that drive a standard 150Ω video load. A typical load
consists of a 75Ω backmatch resistor, an optional
220µF or larger coupling capacitor, and a 75Ω termina-
tion resistor. The offset between input and output sig­nals has been chosen such that the blanking level on
the output is less than 1V after the backmatch resistor,
thus meeting digital TV specifications. This allows the
MAX11500 to drive video loads directly without using
costly AC-coupling capacitors.

Applications Information

Output Considerations

The MAX11500 outputs can be DC- or AC-coupled.
The MAX11500, with +6dB gain, is typically connected
to a 75Ω series backmatch resistor followed by the
video cable. If an AC connection is used, choose an
AC-coupling capacitor value that ensures that the low­est frequency content in the video signal is passed and
the field-time distortion is kept within desired limits. The
selection of this value is a function of the input imped­ance and more importantly the input leakage of the cir­cuit being driven. Common industry practice is to use a
220µF or larger capacitor.

The outputs of the MAX11500 are fully protected
against a short circuit either to the ground or the posi­tive supply of the device. The short-circuit protection
circuitry limits the output current to typically 75mA per
output. Shorting more than one output simultaneously
may exceed the maximum package power dissipation.

PCB Layout Recommendations

The device is thermally designed to operate with mini­mum copper. However, to help with heat dissipation,
connect the power and ground traces to large copper
areas if possible. Bypass VCCto GND with a 0.1µF
capacitor and an additional 1µF capacitor in parallel for
additional low-frequency decoupling. Using surface­mount capacitors reduces lead inductance and
ensures that the impedance of the capacitors is low
over a broad range of frequencies.

Place traces carrying video signals appropriately to
avoid mutual coupling. If AC-coupling the inputs, place
the input coupling capacitors as close as possible to
the device and keep traces short to minimize parasitic
capacitance and inductance. Doing so extends the
performance to the uppermost frequency range possi­ble with the MAX11500.

For a recommended PCB layout, refer to the MAX11500
EV kit data sheet.

MAX11500

Three-Channel, High-Definition Video Filter

_______________________________________________________________________________________ 7

IN1

0.1µF*

0.1µF1µF

220µF*

1

75Ω

75Ω

75Ω

OUT1

GND

*OPTIONAL

V

CC

33MHz

CLAMP

ENCODER

+6dB

8

MAX11500

DAC

IN2

0.1µF* 220µF*
2

75Ω

75Ω

75Ω

OUT2

33MHz

CLAMP

+6dB

7

DAC

IN3

0.1µF* 220µF*
3

75Ω

75Ω

75Ω

OUT3

33MHz

CLAMP

5

4

+5V

+6dB

6

DAC

Typical Operating Circuit

MAX11500

Three-Channel, High-Definition Video Filter

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

© 2008 Maxim Integrated Products 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

.)

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\

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

APPROVAL

21-0041

REV.DOCUMENT CONTROL NO.

1

B

1