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MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

________________________________________________________________

Maxim Integrated Products

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 P

, 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 fil-

ters and buffers with triple-input mux are ideal for high-

definition (HD) and standard-definition (SD) television

(TV) applications. Compatible with 1080i, 720p, 480p,

and 480i scanning system standards as well as com-

puter format signals, the MAX7472/MAX7473 support

component video (Y P

, 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 I

C inter-

face. The adjustable cutoff frequency allows filter opti-

mization 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 I

C 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 upper-

commercial (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.

PART PIN-PACKAGE PKG CODE

BUFFER

GAIN (dB)

MAX7472UTI+ 28 TQFN-EP* T2855-8 0

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

AGND

INB2

INC2

AGND

INA3

INC1

OUT3

OUT1

SDA

AGND

4567

2021 19 17 16 15

AGND

INA1

SYNCB

SYNCA

DGND

INC3

MAX7472

MAX7473

INA2

OUT2

INB1

INB3

SYNCC

SCL

TQFN

5mm x 5mm

*EXPOSED PAD.

TOP VIEW

EP*

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.

Summary of content (19 pages)

PAGE 1
9-0619; Rev 0; 8/06 KIT ATION EVALU LE B A IL A AV HDTV Anti-Aliasing Filters with Triple-Input Mux 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 Sing
PAGE 2
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux ABSOLUTE MAXIMUM RATINGS AVDD to AGND .........................................................-0.3V to +6V DVDD 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 (AVDD + 0.3V) and +6V OUT_ to AGND.…..-0.
PAGE 3
HDTV Anti-Aliasing Filters with Triple-Input Mux (AVDD = +5V ±5%, DVDD = 2.7V to 3.6V, RLOAD = 150Ω to AGND, CIN = 0.1µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS To 1% with 100 IRE step (Note 3) Clamp Settling Time MIN TYP Positive 350 Negative 650 Minimum Functional Input Sync Amplitude MAX H 125 Low-Frequency Gain UNITS mV TA = +25°C, MAX7472 (Note 1) -0.5 0 +0.5 TA = +25°C, MAX7473 (Note 1) 5.5 6 6.
PAGE 4
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux 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) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 400 kHz Serial Clock Frequency fSCL 0 Bus Free Time Between STOP (P) and START (S) Conditions tBUF 1.3 µs Hold Time (Repeated) START (Sr) Condition tHD;STA 0.
PAGE 5
HDTV Anti-Aliasing Filters with Triple-Input Mux -10 CODE 220 -30 CODE 255 CODE 90 -40 -50 CODE 40 -20 -30 CODE 255 CODE 90 -40 0 -0.5 CODE 90 -1.5 -50 -2.0 -70 -60 -2.5 100 1000 0.1 1 FREQUENCY (MHz) PASSBAND FLATNESS (MAX7473) 6.5 6.0 10 100 FREQUENCY (MHz) GROUP DELAY 2T RESPONSE (1 IRE = 7.14mV) DELAY (ns) 60 CODE 90 5.0 1 FREQUENCY (MHz) SD 70 0.1 1000 80 CODE 40 5.5 100 90 MAX7472/73 toc04 7.
PAGE 6
Typical Operating Characteristics (continued) (AVDD = +5V, DVDD = 3.3V, RLOAD = 150Ω to GND, CIN = 0.1µF, TA = +25°C.) BYPASS-MODE FREQUENCY RESPONSE MAX7473 0 MAX7472 16 DELAY (ns) -5 -10 -15 -20 MAX7472/73 toc11 5 BYPASS-MODE GROUP DELAY 20 MAX7472/73 toc10 10 RESPONSE (dB) MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux 12 8 -25 -30 4 -35 -40 0 0.1 1 10 100 1000 0.
PAGE 7
HDTV Anti-Aliasing Filters with Triple-Input Mux PIN NAME FUNCTION 19 OUT2 Video Output 2. OUT2 can be either AC- or DC-coupled. 21 OUT1 23 A0 Address Bit 0 24 A1 Address Bit 1 27 INA1 Channel A Input 1. AC-couple INA1 with a series 0.1µF capacitor. 28 INB1 Channel B Input 1. AC-couple INB1 with a series 0.1µF capacitor. — EP Video Output 1. OUT1 can be either AC- or DC-coupled. Exposed Pad. The exposed pad is located on the package bottom and is internally connected to AGND.
PAGE 8
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux Component/Composite Selection The MAX7472/MAX7473 accept component or composite inputs. The sync detection path provides an additional selectable color burst filter to improve sync detection.
PAGE 9
HDTV Anti-Aliasing Filters with Triple-Input Mux Multiplexers The MAX7472/MAX7473 provide four 3:1 multiplexers programmable through the I2C interface to select which of three separate channels (channels A, B, C) is to be connected to each video input. The fourth multiplexer is used in conjunction with external sync detection and determines which channel’s external sync is to be connected to the external sync input.
PAGE 10
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux Early STOP Conditions The MAX7472/MAX7473 recognize a STOP condition at any point during transmission except when a STOP condition occurs in the same high pulse as a START condition (Figure 3). This condition is not a legal I2C format; at least one clock pulse must separate any START and STOP conditions. The MAX7472/MAX7473 discard any data received during a data transfer aborted by an early STOP condition.
PAGE 11
HDTV Anti-Aliasing Filters with Triple-Input Mux Command Byte (Write Cycle) A write cycle begins with the bus master issuing a START condition followed by 7 address bits (Figure 5) and a write bit (R/W = 0). After successfully receiving its address, the MAX7472/MAX7473 (slave) issue an SDA 1 0 0 1 0 A1 A0 MSB R/W ACK LSB SCL Figure 5.
PAGE 12
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux Table 3. Command Byte Definition COMMAND BYTE: INDIVIDUAL BIT DEFINITIONS DESCRIPTION C7 C6 C5 C4 C3 C2 C1 C0 0 0 0 0 0 0 0 0 Power-down. 0 0 0 0 0 0 0 1 Wake-up; resume normal operation using the frequency/status previously stored (unless power has been cycled). 0 0 0 0 0 0 1 0 Set clamp voltage level for IN1 to low. 0 0 0 0 0 0 1 1 Set clamp voltage level for IN1 to high.
PAGE 13
HDTV Anti-Aliasing Filters with Triple-Input Mux MAX7472/MAX7473 SCL 1 SDA 0 SDA DIRECTION 0 1 0 A1 A0 R/W IN TO MAX7472/MAX7473 ACK 0 0 0 0 0 0 0 0 C7 C6 C5 C4 C3 C2 C1 C0 OUT IN ACK OUT IN STOP START COMMAND BITE IS FOR POWER-DOWN. Figure 7.
PAGE 14
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux Control/Status Register The MAX7472/MAX7473 store their status in an 8-bit register that can be read back by the master. The individual bits of the Control/Status register are summarized in Tables 4 and 5. The power-on default value of this register is 03h.
PAGE 15
HDTV Anti-Aliasing Filters with Triple-Input Mux CHANNEL-SELECTION REGISTER DESCRIPTION CS7 CS6 CS5 CS4 CS3 CS2 CS1 CS0 0 0 X X X X X X Channel A selected (default). 0 1 X X X X X X Channel B selected. 1 0 X X X X X X Channel C selected. X = Don’t care. Channel-Selection Register The MAX7472/MAX7473 store channel selection in an 8-bit register that can be read back by the master. The individual bits of the Channel Selection register are summarized in Table 7.
PAGE 16
MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux Power-Supply Bypassing and Layout Considerations The MAX7472/MAX7473 operate from a single +5V analog supply and +3.3V digital supply. Bypass each AVDD to AGND with a 0.1µF capacitor with an additional 1µF capacitor in parallel for low-frequency decoupling.
PAGE 17
HDTV Anti-Aliasing Filters with Triple-Input Mux DVDD AVDD 0.1μF INA1 MUX INA2 HD INA3 PROGRAMMABLE LPF FILTER 5MHz–34MHz CLAMP OUT1 SYNCA ADC 0dB (6dB) BUFFER 3 2 MUX INB1 EXT SYNC ENABLE INB2 VGA 0.1μF INB3 SYNCB MUX PROGRAMMABLE LPF FILTER 5MHz–34MHz CLAMP/ BIAS OUT2 0.1μF ADC 0dB (6dB) BUFFER INC1 INC2 MUX SD INC3 PROGRAMMABLE LPF FILTER 5MHz–34MHz CLAMP/ BIAS SYNCC CLAMP LEVEL MAX7472 (MAX7473) 0.
PAGE 18
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.) 24L QFN THIN.EPS MAX7472/MAX7473 HDTV Anti-Aliasing Filters with Triple-Input Mux PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.
PAGE 19
HDTV Anti-Aliasing Filters with Triple-Input Mux PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 2 2 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.