19-2119; Rev 2; 9/02
Standard Definition Video Reconstruction
Filters and Buffers
General Description
The MAX7428/MAX7430/MAX7432 filters are low-cost,
high-performance replacements for standard discrete fil-
ter and buffer solutions. The MAX7428/MAX7430/
MAX7432 are ideal for anti-aliasing and DAC smoothing
video applications, when analog video is reconstructed
from a digital data stream. These devices require a sin-
gle +5V supply and the filters have a cutoff frequency
optimized for NTSC, PAL, and standard definition digital
TV (SDTV) video signals. The MAX7428/MAX7430/
MAX7432 feature Maxim’s Single Pin Bus (MSPB™)
interface to digitally control channel selection (IN_A or
IN_B), adjust high-frequency boost, bypass the filter,
configure luma vs. chroma operation, and control the
output disable. The MAX7428 single-channel filter is
ideal for composite (CVBS) video signals. The MAX7430
dual filter is optimized for S-Video (Y/C) applications. The
MAX7432 triple filter is optimized for component (YP
b
P
r
or embedded synchronous RGB) video signals. The
MAX7428 is available in a tiny 8-pin SOT23 package, the
MAX7430 is available in a miniature 10-pin µMAX pack-
age, and the MAX7432 is available in a 14-pin TSSOP
package. The MAX7428/MAX7430/MAX7432 are fully
specified over the -40°C to +85°C extended temperature
range.
o
6th-Order Lowpass Filter
o
Drives Two 150Ω Video Loads
o
Four Levels of Passband High-Frequency
Boost Control
o
Input 2 to 1 Multiplexer
o
Output Disable
o
Filter Bypassing
o
+5V Single-Supply Voltage
o
Tiny 8-Pin SOT23 Package (MAX7428), 10-Pin
µMAX Package (MAX7430), and 14-Pin TSSOP
Package (MAX7432)
Features
o
Ideal for CVBS, Y/C (S-Video), and RGB (Y P
b
P
r
)
Outputs for NTSC, PAL, and SDTV
MAX7428/MAX7430/MAX7432
Ordering Information
PART
MAX7428EKA-T
MAX7430EUB
MAX7432EUD
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 SOT23-8
10 µMAX
14 TSSOP
TOP
MARK
AAIU
—
—
Applications
Set-Top Boxes
DVD Players
Hard-Disk Recorders
Camcorders
MSPB is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
Functional Diagrams
V
CC
SYNCIO
SERIAL INTERFACE
AND CONTROL
DATA
SYNC
MAX7428
C
IN
D/A
INA
6TH-ORDER
FILTER
+6dB
75Ω
OUT
*
75Ω
ENCODER
C
IN
INB
AUX INPUT
GND
*
*OPTIONAL
LEVEL SHIFT
BIAS GENERATOR
REXT
Functional Diagrams continued at end of data sheet.
________________________________________________________________
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.
Standard Definition Video Reconstruction
Filters and Buffers
MAX7428/MAX7430/MAX7432
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................................+6V
All Other Pins to GND .................................-0.3V to (V
CC
+ 0.3V)
Maximum Current Into Any Pin .........................................
±
50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 9.71mW/°C above +70°C)..........777mW
10-Pin µMAX (derate 6.94mW/°C above +70°C) ......555.5mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Operating Temperature Range ...........................-40°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
(V
CC
= +5V ±10%, R
REXT
= 300kΩ ±1%, C
IN
= 0.1µF, C
REXT
= (1nF to 1µF) ±1%, C
LOAD
= 0 to 20pF; BOOST0_, BOOST1_ = 0, 0;
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Passband Response
Stopband Attenuation
HF Boost Relative Step Size, 4
Levels
Differential Gain
Differential Phase
Harmonic Distortion
Signal-to-Noise Ratio
Group Delay Deviation
Line-Time Distortion
Field-Time Distortion
Clamp Settling Time
Output DC Clamp Level
Low-Frequency Gain
Group Delay Matching
Low-Frequency Gain Matching
Channel-to-Channel Crosstalk
Output Short-Circuit Current
Input Leakage Current
Input Dynamic Swing
V
CC
Supply Range
A
V
t
g(MATCH)
A
V(MATCH)
X
TALK
I
SC
I
IN
Y
INp-p
C
INp-p
V
CC
CLEVEL = 0
CLEVEL = 1
4.5
1.4
0.9
5.5
dG
dθ
THD
SNR
∆t
g
H
dist
V
dist
t
clamp
A
sb
SYMBOL
CONDITIONS
f = 100kHz to 4.2MHz relative to 100kHz
f = 100kHz to 5MHz relative to 100kHz
f > 27MHz
f = 4.2MHz to 5MHz
5-step modulated staircase
5-step modulated staircase
f = 100kHz to 5MHz
Peak signal (2Vp-p) to RMS noise,
f = 100Hz to 50MHz
Deviation from 100kHz to 3.58 (4.43)MHz
18µs, 100 IRE bar
130 lines, 18µs, 100 IRE bar
to ±1% (Note 1)
CLEVEL = 0
CLEVEL = 1
Gain at 100kHz
Low frequency channel-to-channel matching
f = 100kHz
Channel-to-channel gain matching, f = 100kHz
Channel-to-channel crosstalk, f = 100kHz
to 5.5MHz
OUT_ shorted to ground or V
CC
-60
50
10
0.8
1.35
1.9
1.975
2
5
72
20
0.3
0.5
100
1.3
1.85
2.05
MIN
-0.5
-1.0
48
0.2
0.4
0.2
0.2
0.1
0.5
0.6
TYP
MAX
+0.5
+1.0
UNITS
dB
dB
dB
%
degrees
%
dB
ns
%
%
Lines
V
V/V
ns
%
dB
mA
µA
Vp-p
V
2
_______________________________________________________________________________________
Standard Definition Video Reconstruction
Filters and Buffers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V ±10%, R
REXT
= 300kΩ ±1%, C
IN
= 0.1µF, C
REXT
= (1nF to 1µF) ±1%, C
LOAD
= 0 to 20pF; BOOST0_, BOOST1_ = 0, 0;
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Supply Current
Power-Supply Rejection Ratio
IN_A/IN_B Crosstalk
LOGIC CHARACTERISTICS
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
Logic Output High Voltage
Logic Output Low Voltage
V
IH
V
IL
I
IH
/I
IL
V
OH
V
OL
V
IL
= 0 (source), V
IH
= V
CC
(sink)
I
(SOURCE)
= 500µA
I
(SINK)
= 500µA
V
CC
-
0.5
0.4
2
0.8
10
V
V
µA
V
V
SYMBOL
I
CC
PSRR
No load
CONDITIONS
MAX7428
MAX7430
MAX7432
V
IN
= 100mVp-p, f = 0 to 5.5MHz
V
IN
= 100mVp-p, f = 100kHz to 5.5MHz
MIN
TYP
24
45
68
40
-60
MAX
32
62
86
dB
dB
mA
UNITS
MAX7428/MAX7430/MAX7432
MSPB INTERFACE TIMING SPECIFICATIONS
(V
CC
= +5V ±10%, R
REXT
= 300kΩ ±1%, C
REXT
= (1nF to 1µF) ±1%, C
LOAD
= 0 to 20pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Figures 4 through 9)
PARAMETER
MSPB TIMING
Logic-Zero/Prompt Pulse Width
Logic-One Pulse Width
Transaction Pulse Width
Separation Between Pulses
Bus Release Time by Host After
Prompt Pulse
Bus Reclaim Time by Host After
Prompt Pulse
Read Back Data Valid Window
After the Prompt Pulse
t
0
, t
P
t
1
t
T
t
WAIT
t
RELEASE
t
RECLAIM
t
READ
13
2.3
4.7
1
24
80
0.5
1
5
30
100
8
36
120
µs
µs
µs
µs
µs
µs
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
One horizontal line = 63.5µs.
Note 2:
MAX7428 devices are 100% production tested at T
A
= +25°C and are guaranteed by design from T
A
= T
MIN
to T
MAX
.
_______________________________________________________________________________________
3
Standard Definition Video Reconstruction
Filters and Buffers
MAX7428/MAX7430/MAX7432
Typical Operating Characteristics
(V
CC
= +5V, R
REXT
= 300kΩ; BOOST0_, BOOST1_ = 0, 0; V
IN_
= 1Vp-p, T
A
= +25°C, unless otherwise noted.)
AMPLITUDE vs. FREQUENCY
MAX7428/30/32 toc01
PASSBAND AMPLITUDE vs. FREQUENCY
MAX7428/30/32 toc02
PHASE RESPONSE vs. FREQUENCY
MAX7428/30/32 toc03
0
-10
AMPLITUDE (dB)
-20
-30
-40
-50
-60
0.1
1
10
2
A
0
AMPLITUDE (dB)
-2
-4
-6
-8
-10
C
B
180
120
PHASE (DEGREES)
60
0
-60
-120
-180
D
A: BOOST1, BOOST0 = 1, 1
B: BOOST1, BOOST0 = 1, 0
C: BOOST1, BOOST0 = 0, 1
D: BOOST1, BOOST0 = 0, 0
0.1
1
FREQUENCY (MHz)
10
100
0.1
1
FREQUENCY (MHz)
10
FREQUENCY (MHz)
GROUP DELAY vs. FREQUENCY
MAX7428/30/32 toc04
2T RESPONSE (1IRE = 7.14mV)
MAX7428/30/32 toc05
MODULATED 12.5T RESPONSE
(1IRE = 7.14mV)
MAX7428/30/32 toc06
120
100
GROUP DELAY (ns)
80
60
40
20
0
0.1
1
FREQUENCY (MHz)
INA_
200mV/div
INA_
200mV/div
OUT_
200mV/div
OUT_
200mV/div
10
200ns/div
400ns/div
SUPPLY CURRENT vs. TEMPERATURE
MAX7428/30/32 toc07
DIFFERENTIAL GAIN
MAX7428/30/32 toc08
DIFFERENTIAL PHASE
-0.06
0
DIFFERENTIAL PHASE (DEGREES)
0.20
0.15
0.10
0.05
0
0.04
0.06
0.06
0.04
0.02
MAX7428/30/32 toc09
28
27
SUPPLY CURRENT (mA)
26
25
24
23
NO LOAD
22
-40
-15
10
35
60
0.2
0
-0.01
-0.04
-0.08
-0.10
DIFFERENTIAL GAIN (%)
0.1
0
-0.1
-0.2
-0.3
-0.05
1st.
2nd.
3rd.
4th.
5th.
6th.
1st.
2nd.
3rd.
4th.
5th.
6th.
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Standard Definition Video Reconstruction
Filters and Buffers
Typical Operating Characteristics (continued)
(V
CC
= +5V, R
REXT
= 300kΩ; BOOST0_, BOOST1_ = 0, 0; V
IN
= 1Vp-p, T
A
= +25°C, unless otherwise noted.)
OUTPUT TRANSIENT DUE TO
INPUT MUX SWITCHING
MAX7428/30/32 toc11
MAX7428/MAX7430/MAX7432
OUTPUT IMPEDANCE vs. FREQUENCY
3.5
3.0
IMPEDANCE
(Ω)
2.5
2.0
1.5
1.0
0.5
OUT_
500mV/div
MAX7428/30/32 toc10
PASSBAND CHANNEL-TO-CHANNEL
CROSSTALK vs. FREQUENCY
MAX7428/30/32 toc12
4.0
-70
-75
CROSSTALK (dB)
-80
-85
-90
BOOST = CODE 00
0
0.1
1
FREQUENCY (MHz)
10
200ns/div
-95
0.1
1
FREQUENCY (MHz)
10
Pin Description
PIN
MAX7432
1
2
3
4, 10
5
6
7
8
9
11
12
MAX7430
1
2
—
8
4
5
—
6
—
7
3
MAX7428
—
—
—
4
—
—
—
6
—
—
7
NAME
IN1A
IN2A
IN3A
GND
IN1B
IN2B
IN3B
DATA
OUT3
OUT2
REXT
FUNCTION
Video Input 1A. Master channel, sync signal required. Use a 0.1µF
series input capacitor for proper operation.
Video Input 2A. Slave channel, clamping controlled by master channel
sync. Use a 0.1µF series input capacitor for proper operation.
Video Input 3A. Slave channel, clamping controlled by master channel
sync. Use a 0.1µF series input capacitor for proper operation.
Ground
Video Input 1B. Master channel, sync signal required. Use a 0.1µF
series input capacitor for proper operation.
Video Input 2B. Slave channel, clamping controlled by master channel
sync. Use a 0.1µF series input capacitor for proper operation.
Video Input 3B. Slave channel, clamping controlled by master channel
sync. Use a 0.1µF series input capacitor for proper operation.
Serial Data Interface
Buffer Output 3
Buffer Output 2
External Resistor. Connect a 300kΩ resistor from REXT to GND for
internal biasing. Connect a 1nF to 1µF capacitor from REXT to GND for
chip-address programming (see Table 3).
_______________________________________________________________________________________
5
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