19-0619; Rev 0; 8/06
KIT
ATION
EVALU
E
BL
AVAILA
HDTV Anti-Aliasing Filters with Triple-Input Mux
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
B
P
R
, 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
2
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
2
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
o
Continuously Variable Anti-Aliasing Filter
5MHz to 34MHz in 256 Steps
o
3:1 Input Mux on Each Video Filter
o
Supports All Standard Video and Computer Input
Formats
480i, 480p, 720p, 1080i
QVGA, VGA, SVGA, XGA, SXGA, UXGA
Y P
B
P
R
, GsBR, RGBHV, Y/C, CVBS
o
Accepts Any Input Sync Format
Sync on Y, Sync on G, External Sync
(Positive or Negative)
Sync on All Channels
o
Buffered Outputs Drive Standard 150Ω Video Load
0dB (MAX7472)
+6dB (MAX7473)
o
DC- or AC-Coupled Outputs
o
Single +5V Analog and +3.3V Digital Supplies
o
5mW Power-Down Mode
o
Lead (Pb)-Free 28-Pin TQFN Package
MAX7472/MAX7473
Ordering Information
PART
PIN-PACKAGE
28 TQFN-EP*
PKG CODE
T2855-8
BUFFER
GAIN (dB)
0
Applications
HDTV (LCD, PDP, DLP, CRT)
Set-Top Boxes
Personal Video Recorders
Home Theaters
MAX7472UTI+
MAX7473UTI+**
28 TQFN-EP*
T2855-8
+6
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
OUT1
OUT2
OUT3
AV
DD
DV
DD
16
AV
DD
21
AV
DD
22
A0 23
20
19
18
17
15
14
13
12
SCL
SYNCC
SYNCB
SYNCA
DGND
INC3
INB3
SDA
11
10
EP*
9
8
1
INC1
2
AGND
3
INA2
4
INB2
5
INC2
6
AGND
7
INA3
TOP VIEW
Typical Operating Circuit appears at end of data sheet.
A1 24
AGND 25
AGND 26
INA1 27
INB1 28
+
MAX7472
MAX7473
TQFN
5mm x 5mm
*EXPOSED PAD.
________________________________________________________________
Maxim Integrated Products
1
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.
HDTV Anti-Aliasing Filters with Triple-Input Mux
MAX7472/MAX7473
ABSOLUTE MAXIMUM RATINGS
AV
DD
to 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
, DV
DD
, 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
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.
ELECTRICAL CHARACTERISTICS
(AV
DD
= +5V ±5%, DV
DD
= 2.7V to 3.6V, R
LOAD
= 150Ω to AGND, C
IN
= 0.1µF, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
HD: f = 100kHz to 30MHz, relative to 100kHz
(Note 1)
Filter Passband Response
A
PB
SD: f = 100kHz to 5.75MHz, relative to
100kHz (Note 2)
HD: f = 74MHz (Note 1)
SD: f = 27MHz (Note 2)
HD: 100kHz to 30MHz, relative to 100kHz
(Note 1)
SD: 100kHz to 5.75MHz, relative to 100kHz
(Note 2)
HD: channel to channel, 100kHz to 2MHz
(Note 1)
Group-Delay Matching
t
G(MATCH)
SD: channel to channel, 100kHz to 500kHz
(Note 2)
-3dB, bypass mode, independent of filter
setting
dG
dφ
SNR
H
DIST
V
DIST
5-step modulated staircase (Note 2)
5-step modulated staircase (Note 2)
Output signal (2V
P-P
) to RMS noise (100kHz
to 30MHz) (Note 1)
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)
MIN
-3
TYP
-0.6
±0.1
57
63
20
ns
15
5
ns
1.5
100
0.25
0.25
69
0.3
0.3
MHz
%
Degrees
dB
%
%
MAX
+1
dB
±1.0
dB
UNITS
Filter Stopband Attenuation
A
SB
Group-Delay Deviation
Δt
G
Bypass Frequency Response
SD Differential Gain
SD Differential Phase
Signal-to-Noise Ratio
SD Line-Time Distortion
SD Field-Time Distortion
2
_______________________________________________________________________________________
HDTV Anti-Aliasing Filters with Triple-Input Mux
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= +5V ±5%, DV
DD
= 2.7V to 3.6V, R
LOAD
= 150Ω to AGND, C
IN
= 0.1µF, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
Clamp Settling Time
Minimum Functional Input Sync
Amplitude
Low-Frequency Gain
Low-Frequency Gain Matching
Maximum Input Voltage
Amplitude
Maximum Output Voltage
Amplitude
Output Clamping Level Variation
Mux Crosstalk
Channel-to-Channel Isolation
Power-Supply Rejection Ratio
DIGITAL INPUTS (A1, A0, SYNC_)
Input Logic High Voltage
Input Logic Low Voltage
Input Leakage Current
Input Capacitance
DIGITAL INPUTS (SDA, SCL)
Input Logic High Voltage
Input Logic Low Voltage
Input Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUT (SDA)
Output Logic Low Voltage
Tri-State Leakage Current
Tri-State Output Capacitance
POWER REQUIREMENTS
Analog Supply Voltage Range
Digital Supply Voltage Range
Analog Supply Current
Digital Supply Current
AV
DD
DV
DD
I
AVDD
I
DVDD
Normal operation, no load
Power-down mode, no load
4.75
2.7
5
3.3
180
1
25
5.25
3.6
200
1.5
V
V
mA
µA
V
OL
I
L
C
OUT
I
SINK
= 3mA
V
IN
= 0 to DV
DD
±0.1
6
0.4
±10
V
µA
pF
V
IH
V
IL
V
HYST
I
IN
C
IN
V
IN
= 0 to DV
DD
0.05 x DV
DD
±0.1
6
±10
0.7 x DV
DD
0.3 x DV
DD
V
V
V
µA
pF
V
IH
V
IL
I
IN
C
IN
V
IN
= 0 to DV
DD
±1
6
2.0
0.8
±10
V
V
µA
pF
PSRR
T
A
= +25°C, MAX7472 (Note 1)
T
A
= +25°C, MAX7473 (Note 1)
100kHz
MAX7472
MAX7473
DC to 30MHz
(Notes 1, 4)
-80
62
50
SYMBOL
CONDITIONS
To 1% with 100 IRE step
(Note 3)
Positive
Negative
125
-0.5
5.5
0
6
0.05
2.4
1.2
2.4
±120
+0.5
6.5
MIN
TYP
350
650
MAX
UNITS
H
mV
dB
dB
V
P-P
V
P-P
mV
dB
dB
dB
MAX7472/MAX7473
_______________________________________________________________________________________
3
HDTV Anti-Aliasing Filters with Triple-Input Mux
MAX7472/MAX7473
TIMING CHARACTERISTICS
(AV
DD
= +5V ±5%, DV
DD
= 2.7V to 3.6V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Figure 1)
PARAMETER
Serial Clock Frequency
Bus Free Time Between STOP (P)
and START (S) Conditions
Hold Time (Repeated) START (Sr)
Condition
SCL Pulse-Width Low
SCL Pulse-Width High
Setup Time for a Repeated START
(Sr) Condition
Data Hold Time
Data Setup Time
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
Capacitive Load for Each Bus Line
Pulse Width of Spikes Suppressed
by the Input Filter
SYMBOL
f
SCL
t
BUF
t
HD;STA
t
LOW
t
HIGH
t
SU;STA
t
HD;DAT
t
SU;DAT
t
r
t
f
t
f
t
SU;STO
C
b
t
SP
(Note 7)
0
(Note 6)
(Note 5)
After this period, the first clock pulse is
generated
CONDITIONS
MIN
0
1.3
0.6
1.3
0.6
0.6
0
100
0
0
20 +
0.1C
b
0.6
400
50
300
300
300
0.9
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
µs
pF
ns
The filter passband edge is set to code 255.
The filter passband edge is set to code 40.
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.
The clamp level is at the sync tip for signals with sync pulses, and is at the blanking level otherwise.
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. t
R
and t
F
measured between 0.3V
DD
and 0.7V
DD
.
Note 7:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
SDA
t
BUF
t
f
t
LOW
t
r
t
SU;DAT
t
f
t
HD;STA
t
SP
t
r
SCL
t
HD;STA
S
t
HD;DAT
t
HIGH
t
SU;STA
S
r
t
SU;STO
P
S
Figure 1. 2-Wire Serial-Interface Timing Diagram
4
_______________________________________________________________________________________
HDTV Anti-Aliasing Filters with Triple-Input Mux
Typical Operating Characteristics
(AV
DD
= +5V, DV
DD
= 3.3V, R
LOAD
= 150Ω to GND, C
IN
= 0.1µF, T
A
= +25°C.)
MAX7472/MAX7473
FREQUENCY RESPONSE (MAX7472)
MAX7472/73 toc01
FREQUENCY RESPONSE (MAX7473)
0
-10
RESPONSE (dB)
CODE 40
-20
-30
-40
-50
-60
-70
CODE 90
CODE 220
CODE 255
MAX7472/73 toc02
PASSBAND FLATNESS (MAX7472)
0.5
0
RESPONSE (dB)
-0.5
-1.0
CODE 90
-1.5
-2.0
-2.5
-3.0
CODE 220
CODE 255
CODE 40
MAX7472/73 toc03
10
0
-10
RESPONSE (dB)
-20
-30
-40
-50
-60
-70
-80
0.1
1
10
100
CODE 90
CODE 255
CODE 40
CODE 220
10
1.0
1000
0.1
1
10
100
1000
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
PASSBAND FLATNESS (MAX7473)
MAX7472/73 toc04
GROUP DELAY
80
70
60
DELAY (ns)
50
40
30
HD
SD
MAX7472/73 toc05
2T RESPONSE (1 IRE = 7.14mV)
MAX7472/73 toc06
7.0
6.5
6.0
RESPONSE (dB)
5.5
5.0
4.5
4.0
3.5
3.0
0.1
1
10
CODE 220
CODE 255
CODE 40
CODE 90
90
20
10
0
100
0.1
1
10
100
100ns/div
FREQUENCY (MHz)
FREQUENCY (MHz)
MODULATED 12.5T RESPONSE
DIFFERENTIAL GAIN (%)
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
MAX7472/73 toc07
DIFFERENTIAL GAIN
MAX7472/73 toc08
-3dB FREQUENCY vs. CONTROL CODE
MEASURED CUTOFF FREQUENCY (MHz)
MAX7472/73 toc09
35
30
25
20
15
10
5
DIFFERENTIAL PHASE (°)
DIFFERENTIAL PHASE
0.2
0.1
0
-0.1
-0.2
1
2
3
4
5
6
7
400ns/div
0
51
102
153
CONTROL CODE
204
255
_______________________________________________________________________________________
5
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