Rainbow Electronics MAX7473 User Manual

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-0619; Rev 0; 8/06

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.

 Continuously Variable Anti-Aliasing Filter

5MHz to 34MHz in 256 Steps

 3:1 Input Mux on Each Video Filter

 Supports All Standard Video and Computer Input

Formats

480i, 480p, 720p, 1080i
QVGA, VGA, SVGA, XGA, SXGA, UXGA
Y PB PR, GsBR, RGBHV, Y/C, CVBS

 Accepts Any Input Sync Format

Sync on Y, Sync on G, External Sync
(Positive or Negative)
Sync on All Channels

 Buffered Outputs Drive Standard 150Ω Video Load

0dB (MAX7472)
+6dB (MAX7473)

 DC- or AC-Coupled Outputs

 Single +5V Analog and +3.3V Digital Supplies

 5mW Power-Down Mode

 Lead (Pb)-Free 28-Pin TQFN Package

General Description

The MAX7472/MAX7473 triple-channel anti-aliasing fil­ters and buffers with triple-input mux are ideal for high­definition (HD) and standard-definition (SD) television
(TV) applications. Compatible with 1080i, 720p, 480p,
and 480i scanning system standards as well as com­puter format signals, the MAX7472/MAX7473 support
component video (Y PBPR, GsBR, and RGBHV) as well
as composite (CVBS) and S-video (Y/C).

The MAX7472/MAX7473 limit the input bandwidth for
anti-aliasing and out-of-band noise reduction prior to
digital conversion by an ADC or video decoder. The
frequency response of the MAX7472/MAX7473 can be
continuously varied in 256 linear steps from below SD
response to beyond HD response through an I2C inter­face. The adjustable cutoff frequency allows filter opti­mization for sampling rate and noise reduction. The
MAX7472/MAX7473 also include 3:1 multiplexers for
selection of three complete sets of video inputs through
the I2C interface.

The MAX7472/MAX7473 drive a 2V

P-P

video signal into
a standard 150Ω load. The inputs are AC-coupled and
the outputs can be either DC- or AC-coupled. The
MAX7472 has a gain of 0dB and the MAX7473 has a
gain of +6dB. Both devices are available in a 28-pin
TQFN package and are fully specified over the upper­commercial (0°C to +85°C) temperature range.

Features

EVALUATION KIT

AVAILABLE

Note: All devices are specified over the 0°C to +85°C operat-

ing temperature range.
+Indicates lead-free packaging.
*EP = Exposed pad.

**

Future product—contact factory for availability.

Pin Configuration

HDTV (LCD, PDP, DLP, CRT)

Set-Top Boxes

Personal Video Recorders

Home Theaters

Applications

Typical Operating Circuit appears at end of data sheet.

PART PIN-PACKAGE PKG CODE

MAX7472UTI+ 28 TQFN-EP* T2855-8 0

MAX7473UTI+** 28 TQFN-EP* T2855-8 +6

BUFFER

GAIN (dB)

TOP VIEW

AGND

AGND

AV

INA1

INB1

22

DD

A0

23

24

A1

25

26

27

28

DDAVDD

OUT1

AV

2021 19 17 16 15

+

12

INC1

AGND

5mm x 5mm

*EXPOSED PAD.

OUT3

OUT2

18

MAX7472
MAX7473

4567

3

INA2

INB2

INC2

TQFN

EP*

DVDDSDA

INA3

AGND

14

SCL

SYNCC

13

12

SYNCB

SYNCA

11

10

DGND

INC3

9

8

INB3

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(AVDD= +5V ±5%, DVDD= 2.7V to 3.6V, R

LOAD

= 150Ω to AGND, CIN= 0.1µF, TA= 0°C to +85°C, unless otherwise noted. Typical

values are at T

A

= +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.

AVDDto AGND .........................................................-0.3V to +6V

DV

DD

to DGND.........................................................-0.3V to +4V

AGND to DGND.....................................................-0.3V to +0.3V

INA_, INB_, INC_ to AGND...........................................................

............................-0.3V to the lower of (AV

DD

+ 0.3V) and +6V

OUT_ to AGND.…..-0.3V to the lower of (AV

DD

+ 0.3V) and +6V

SYNC_, A_ to AGND.....................................................................

...............................-0.3V to the lower of (AV

DD

+ 0.3V) and +6V

SCL, SDA to DGND .................................................-0.3V to + 6V

Maximum Current into Any Pin

(except AV

DD

, DVDD, and OUT) ...................................±50mA

Continuous Power Dissipation (T

A

= +70°C)

28-Pin TQFN (derate 34.5mW/°C above +70°C) ........2758mW

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

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

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

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

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Filter Passband Response A

Filter Stopband Attenuation A

Group-Delay Deviation Δt

Group-Delay Matching t

Bypass Frequency Response

SD Differential Gain dG 5-step modulated staircase (Note 2) 0.25 %

SD Differential Phase dφ 5-step modulated staircase (Note 2) 0.25 D egr ees

Signal-to-Noise Ratio SNR

SD Line-Time Distortion H

SD Field-Time Distortion V

G(MATCH

HD: f = 100kHz to 30MHz, relative to 100kHz
(Note 1)

PB

SD: f = 100kHz to 5.75MHz, relative to
100kHz (Note 2)

HD: f = 74MHz (Note 1) 57

SB

SD: f = 27MHz (Note 2) 63

HD: 100kHz to 30MHz, relative to 100kHz
(Note 1)

G

SD: 100kHz to 5.75MHz, relative to 100kHz
(Note 2)

HD: channel to channel, 100kHz to 2MHz
(Note 1)

SD: channel to channel, 100kHz to 500kHz
(Note 2)

-3dB, bypass mode, independent of filter
setting

Output signal (2V
to 30MHz) (Note 1)

DIST

DIST

Deviations in a line with an 18µs, 100 IRE bar,
1 line = 63.5µs (Note 2)

Deviations in 130 lines with 18µs, 100 IRE
bars (Note 2)

) to RMS noise (100kHz

P-P

-3 -0.6 +1

±0.1 ±1.0

20

15

5

1.5

100 MHz

69 dB

0.3 %

0.3 %

dB

dB

ns

ns

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AVDD= +5V ±5%, DVDD= 2.7V to 3.6V, R

LOAD

= 150Ω to AGND, CIN= 0.1µF, TA= 0°C to +85°C, unless otherwise noted. Typical

values are at T

A

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Clamp Settling Time

Minimum Functional Input Sync
Amplitude

Low-Frequency Gain

Low-Frequency Gain Matching 100kHz 0.05 dB

Maximum Input Voltage
Amplitude

Maximum Output Voltage
Amplitude

Output Clamping Level Variation (Notes 1, 4) ±120 mV

Mux Crosstalk -80 dB

Channel-to-Channel Isolation 62 dB

Power-Supply Rejection Ratio PSRR 50 dB

DIGITAL INPUTS (A1, A0, SYNC_)

Input Logic High Voltage V

Input Logic Low Voltage V

Input Leakage Current I

Input Capacitance C

DIGITAL INPUTS (SDA, SCL)

Input Logic High Voltage V

Input Logic Low Voltage V

Input Hysteresis V

Input Leakage Current I

Input Capacitance C

DIGITAL OUTPUT (SDA)

Output Logic Low Voltage V

Tri-State Leakage Current I

Tri-State Output Capacitance C

POWER REQUIREMENTS

Analog Supply Voltage Range AV

Digital Supply Voltage Range DV

Analog Supply Current I

Digital Supply Current I

To 1% with 100 IRE step
(Note 3)

Positive 350

Negative 650

125 mV

TA = +25°C, MAX7472 (Note 1) -0.5 0 +0.5

= +25°C, MAX7473 (Note 1) 5.5 6 6.5

T

A

MAX7472 2.4

MAX7473 1.2

DC to 30MHz 2.4 V

IH

IL

IN

IN

IH

IL

HYST

IN

IN

OL

L

OUT

DD

DD

AVDD

DVDD

VIN = 0 to DV

VIN = 0 to DV

I

= 3mA 0.4 V

SINK

VIN = 0 to DV

DD

DD

DD

Normal operation, no load 180 200

Power-down mode, no load 1 1.5

2.0 V

±1 ±10 µA

6pF

0.7 x DV

DD

0.3 x DV

0.05 x DV

DD

±0.1 ±10 µA

6pF

±0.1 ±10 µA

6pF

4.75 5 5.25 V

2.7 3.3 3.6 V

25 µA

0.8 V

DD

H

dB

V

P-P

P-P

V

V

V

mA

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS

(AVDD= +5V ±5%, DVDD= 2.7V to 3.6V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Figure 1)

Note 1: The filter passband edge is set to code 255.
Note 2: The filter passband edge is set to code 40.
Note 3: 1H is the total line period, depending on the video standard. For NTSC, this is 63.5µs, for HDTV, the line period is 29.64µs.
Note 4: The clamp level is at the sync tip for signals with sync pulses, and is at the blanking level otherwise.
Note 5: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V

IL

of the SCL signal) to bridge

the undefined region of SCL’s falling edge.

Note 6: C

b

= total capacitance of one bus line in pF. tRand tFmeasured between 0.3VDDand 0.7VDD.

Note 7: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.

Figure 1. 2-Wire Serial-Interface Timing Diagram

Serial Clock Frequency f

Bus Free Time Between STOP (P)
and START (S) Conditions

Hold Time (Repeated) START (Sr)
Condition

SCL Pulse-Width Low t

SCL Pulse-Width High t

Setup Time for a Repeated START
(Sr) Condition

Data Hold Time t

Data Setup Time t

Rise Time of Both SDA and SCL
Signals, Receiving

Fall Time of Both SDA and SCL
Signals, Receiving

Fall Time of SDA Signal,
Transmitting

Setup Time for STOP (P) Condition t

Capacitive Load for Each Bus Line C

Pulse Width of Spikes Suppressed
by the Input Filter

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCL

t

BUF

t

HD;STA

LOW

HIGH

t

SU;STA

HD;DAT

SU;DAT

t

r

t

f

t

f

SU;STO

b

t

SP

After this period, the first clock pulse is
generated

(Note 5) 0 0.9 µs

(Note 6)

(Note 7) 0 50 ns

0 400 kHz

1.3 µs

0.6 µs

1.3 µs

0.6 µs

0.6 µs

100 ns

0 300 ns

0 300 ns

20 +

0.1C

b

0.6 µs

300 ns

400 pF

SDA

t

BUF

t

r

PS

SCL

t

f

S

t

t

HD;STA

LOW

t

HD;DAT

t

SU;DAT

t

r

t

HIGH

t

f

t

SU;STA

Sr

t

HD;STA

t

SP

t

SU;STO

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

_______________________________________________________________________________________

5

Typical Operating Characteristics

(AVDD= +5V, DVDD= 3.3V, R

LOAD

= 150Ω to GND, CIN= 0.1µF, TA= +25°C.)

FREQUENCY RESPONSE (MAX7472)

10

0

-10

-20

-30

-40

RESPONSE (dB)

-50

-60

-70

-80

CODE 40

CODE 90

0.1 101 100 1000
FREQUENCY (MHz)

PASSBAND FLATNESS (MAX7473)

7.0

6.5

6.0

5.5

5.0

RESPONSE (dB)

4.5

4.0

3.5

3.0

0.1 101 100

CODE 40

CODE 90

CODE 220

CODE 255

FREQUENCY (MHz)

FREQUENCY RESPONSE (MAX7473)

10

0

MAX7472/73 toc01

CODE 220

CODE 255

MAX7472/73 toc04

-10

-20

-30

RESPONSE (dB)

-40

-50

-60

-70

90

80

70

60

50

40

DELAY (ns)

30

20

10

0

CODE 40

CODE 90

0.1 101 100 1000

SD

0.1 1 10 100

PASSBAND FLATNESS (MAX7472)

1.0

0.5

MAX7472/73 toc02

CODE 220

CODE 255

FREQUENCY (MHz)

GROUP DELAY

MAX7472/73 toc05

HD

FREQUENCY (MHz)

0

-0.5

-1.0

RESPONSE (dB)

-1.5

-2.0

-2.5

-3.0

0.1 101100

CODE 40

CODE 90

CODE 220

CODE 255

FREQUENCY (MHz)

2T RESPONSE (1 IRE = 7.14mV)

100ns/div

MAX7472/73 toc03

MAX7472/73 toc06

MODULATED 12.5T RESPONSE

400ns/div

MAX7472/73 toc07

0.3

0.2

0.1
0

-0.1

-0.2

-0.3

MAX7472/73 toc08

DIFFERENTIAL PHASE

0.2

0.1

0

-0.1

-0.2

DIFFERENTIAL PHASE (°) DIFFERENTIAL GAIN (%)

1342567

DIFFERENTIAL GAIN

-3dB FREQUENCY vs. CONTROL CODE

35

30

25

20

15

10

MEASURED CUTOFF FREQUENCY (MHz)

5

0 51 102 153 204 255

CONTROL CODE

MAX7472/73 toc09

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(AVDD= +5V, DVDD= 3.3V, R

LOAD

= 150Ω to GND, CIN= 0.1µF, TA= +25°C.)

Pin Description

BYPASS-MODE FREQUENCY RESPONSE

10

5

0

-5

-10

-15

-20

RESPONSE (dB)

-25

-30

-35

-40

0.1 101 100 1000

MAX7473

MAX7472

FREQUENCY (MHz)

PIN NAME FUNCTION

1 INC1 Channel C Input 1. AC-couple INC1 with a series 0.1µF capacitor.

2, 6, 25, 26 AGND

Analog Ground. Connect all AGND pins to the ground plane. See the Power-Supply Bypassing and
Layout Considerations section.

3 INA2 Channel A Input 2. AC-couple INA2 with a series 0.1µF capacitor.

4 INB2 Channel B Input 2. AC-couple INB2 with a series 0.1µF capacitor.

5 INC2 Channel C Input 2. AC-couple INC2 with a series 0.1µF capacitor.

7 INA3 Channel A Input 3. AC-couple INA3 with a series 0.1µF capacitor.

8 INB3 Channel B Input 3. AC-couple INB3 with a series 0.1µF capacitor.

9 INC3 Channel C Input 3. AC-couple INC3 with a series 0.1µF capacitor.

10 DGND Digital Ground. See the Power-Supply Bypassing and Layout Considerations section.

11 SYNCA Channel A External Sync Input. Connect to ground if not used.

12 SYNCB Channel B External Sync Input. Connect to ground if not used.

13 SYNCC Channel C External Sync Input. Connect to ground if not used.

14 SCL I2C-Compatible Serial Clock Input

15 SDA I2C-Compatible Serial Data Input/Output

16 DV

DD

Digital Power Supply. Bypass to DGND with a 0.1µF capacitor. See the Power-Supply Bypassing and
Layout Considerations section.

17 OUT3 Video Output 3. OUT3 can be either AC- or DC-coupled.

18, 20, 22 AV

DD

Analog Power Supply. Bypass each AVDD input to AGND using a 0.1µF capacitor. See the Power-
Supply Bypassing and Layout Considerations section.

MAX7472/73 toc10

BYPASS-MODE GROUP DELAY

20

16

12

DELAY (ns)

8

4

0

0.1 101100
FREQUENCY (MHz)

MAX7472/73 toc11