MAXIM MAX7428, MAX7430, MAX7432 Technical data

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General Description

The MAX7428/MAX7430/MAX7432 filters are low-cost,
high-performance replacements for standard discrete fil­ter 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 sin­gle +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 (YPbP

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 pack­age, 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.

Applications

Set-Top Boxes

DVD Players

Hard-Disk Recorders

Camcorders

Features

♦ Ideal for CVBS, Y/C (S-Video), and RGB (Y PbPr)

Outputs for NTSC, PAL, and SDTV

♦ 6th-Order Lowpass Filter

♦ Drives Two 150Ω Video Loads

♦ Four Levels of Passband High-Frequency

Boost Control

♦ Input 2 to 1 Multiplexer

♦ Output Disable

♦ Filter Bypassing

♦ +5V Single-Supply Voltage

♦ Tiny 8-Pin SOT23 Package (MAX7428), 10-Pin

µMAX Package (MAX7430), and 14-Pin TSSOP
Package (MAX7432)

MAX7428/MAX7430/MAX7432

Standard Definition Video Reconstruction

Filters and Buffers

________________________________________________________________ Maxim Integrated Products 1

Functional Diagrams

Ordering Information

19-2119; Rev 2; 9/02

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

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.

MSPB is a trademark of Maxim Integrated Products, Inc.

V

CC

PART

MAX7428EKA-T -40°C to +85°C 8 SOT23-8 AAIU

MAX7430EUB -40°C to +85°C 10 µMAX —

MAX7432EUD -40°C to +85°C 14 TSSOP —

TEMP

RANGE

PIN­PACKAGE

TOP

MARK

SYNCIO

C

IN

D/A

ENCODER

C

IN

AUX INPUT

*OPTIONAL

SYNC

INA

INB

GND

MAX7428

6TH-ORDER

FILTER

LEVEL SHIFT

SERIAL INTERFACE

AND CONTROL

+6dB

BIAS GENERATOR

REXT

*

DATA

OUT

75Ω

*

75Ω

MAX7428/MAX7430/MAX7432

Standard Definition Video Reconstruction
Filters and Buffers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±10%, R

REXT

= 300kΩ ±1%, CIN= 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 TA= +25°C.) (Note 2)

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.

VCCto 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

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Passband Response

Stopband Attenuation A

HF Boost Relative Step Size, 4
Levels

Differential Gain dG 5-step modulated staircase 0.2 %

Differential Phase dθ 5-step modulated staircase 0.2 degrees

Harmonic Distortion THD f = 100kHz to 5MHz 0.1 0.5 %

Signal-to-Noise Ratio SNR

Group Delay Deviation ∆t

Line-Time Distortion H

Field-Time Distortion V

Clamp Settling Time t

Output DC Clamp Level

Low-Frequency Gain A

Group Delay Matching

sb

g

dist

dist

clamp

V

t

g(MATCH)

f = 100kHz to 4.2MHz relative to 100kHz -0.5 +0.5

f = 100kHz to 5MHz relative to 100kHz -1.0 +1.0

f > 27MHz 48 dB

f = 4.2MHz to 5MHz 0.2 0.4 0.6 dB

Peak signal (2Vp-p) to RMS noise,
f = 100Hz to 50MHz

Deviation from 100kHz to 3.58 (4.43)MHz 20 ns

18µs, 100 IRE bar 0.3 %

130 lines, 18µs, 100 IRE bar 0.5 %

to ±1% (Note 1) 100 Lines

CLEVEL = 0 0.8 1.3

CLEVEL = 1 1.35 1.85

Gain at 100kHz 1.9 1.975 2.05 V/V

Low frequency channel-to-channel matching
f = 100kHz

72 dB

2ns

dB

V

Low-Frequency Gain Matching A

Channel-to-Channel Crosstalk X

Output Short-Circuit Current I

Input Leakage Current I

Input Dynamic Swing

VCC Supply Range V

V(MATCH

TALK

SC

IN

Y

INp-p

C

INp-p

CC

C hannel - to- channel g ai n m atchi ng , f = 100kH z5%

Channel-to-channel crosstalk, f = 100kHz
to 5.5MHz

OUT_ shorted to ground or V

CLEVEL = 0 1.4

CLEVEL = 1 0.9

CC

4.5 5.5 V

-60 dB

50 mA

10 µA

Vp-p

MAX7428/MAX7430/MAX7432

Standard Definition Video Reconstruction

Filters and Buffers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±10%, R

REXT

= 300kΩ ±1%, CIN= 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 TA= +25°C.) (Note 2)

MSPB INTERFACE TIMING SPECIFICATIONS

(VCC= +5V ±10%, R

REXT

= 300kΩ ±1%, C

REXT

= (1nF to 1µF) ±1%, C

LOAD

= 0 to 20pF, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

A

= +25°C.) (Figures 4 through 9)

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 TA= T

MIN

to T

MAX

.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Rejection Ratio PSRR V

IN_A/IN_B Crosstalk V

LOGIC CHARACTERISTICS

Logic Input High Voltage V

Logic Input Low Voltage V

Logic Input Current IIH/I

Logic Output High Voltage V

Logic Output Low Voltage V

CC

IH

IL

IL

OH

OL

No load

= 100mVp-p, f = 0 to 5.5MHz 40 dB

IN

= 100mVp-p, f = 100kHz to 5.5MHz -60 dB

IN

VIL = 0 (source), VIH = VCC (sink) 10 µA

I

(SOURCE)

I

(SINK)

= 500µA

= 500µA 0.4 V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MSPB TIMING

Logic-Zero/Prompt Pulse Width t0, t

Logic-One Pulse Width t

Transaction Pulse Width t

Separation Between Pulses t

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

1

T

WAIT

t

RELEASE

t

RECLAIM

t

READ

P

MAX7428 24 32

MAX7430 45 62Supply Current I

MAX7432 68 86

2V

0.8 V

V

-

CC

0.5

158µs

24 30 36 µs

80 100 120 µs

0.5 µs

13 µs

2.3 4.7 µs

mA

V

1µs

MAX7428/MAX7430/MAX7432

Standard Definition Video Reconstruction
Filters and Buffers

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +5V, R

REXT

= 300kΩ; BOOST0_, BOOST1_ = 0, 0; V

IN_

= 1Vp-p, TA= +25°C, unless otherwise noted.)

0.1 1 10 100

AMPLITUDE vs. FREQUENCY

MAX7428/30/32 toc01

FREQUENCY (MHz)

AMPLITUDE (dB)

0

-60

-50

-40

-30

-20

-10

0.1 1 10

PASSBAND AMPLITUDE vs. FREQUENCY

MAX7428/30/32 toc02

FREQUENCY (MHz)

AMPLITUDE (dB)

2

-10

-8

-6

-4

-2

0

A

C

D

B

A: BOOST1, BOOST0 = 1, 1
B: BOOST1, BOOST0 = 1, 0
C: BOOST1, BOOST0 = 0, 1
D: BOOST1, BOOST0 = 0, 0

0.1 1 10

PHASE RESPONSE vs. FREQUENCY

MAX7428/30/32 toc03

FREQUENCY (MHz)

PHASE (DEGREES)

180

-180

-120

-60

0

60

120

0.1 1 10

GROUP DELAY vs. FREQUENCY

MAX7428/30/32 toc04

FREQUENCY (MHz)

GROUP DELAY (ns)

120

0

20

40

60

80

100

200ns/div

2T RESPONSE (1IRE = 7.14mV)

INA_

200mV/div

OUT_

200mV/div

MAX7428/30/32 toc05

400ns/div

MODULATED 12.5T RESPONSE

(1IRE = 7.14mV)

INA_

200mV/div

OUT_

200mV/div

MAX7428/30/32 toc06

22

24

23

26

25

27

28

-40 10-15 35 60 85

SUPPLY CURRENT vs. TEMPERATURE

MAX7428/30/32 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

NO LOAD

0.2

0.1

0

-0.1

-0.2

-0.3

DIFFERENTIAL GAIN (%)

0 -0.01 -0.04 -0.08 -0.10

-0.06

1st.

2nd.

3rd. 4th.

5th.

6th.

DIFFERENTIAL GAIN

MAX7428/30/32 toc08

MAX7428/30/32 toc09

0.20

0.15

0.10

0.05

0

-0.05
1st.

2nd.

3rd.

4th.

5th. 6th.

0 0.04 0.06

0.06

0.04 0.02

DIFFERENTIAL PHASE (DEGREES)

DIFFERENTIAL PHASE

MAX7428/MAX7430/MAX7432

Standard Definition Video Reconstruction

Filters and Buffers

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= +5V, R

REXT

= 300kΩ; BOOST0_, BOOST1_ = 0, 0; VIN= 1Vp-p, TA= +25°C, unless otherwise noted.)

Pin Description

OUTPUT IMPEDANCE vs. FREQUENCY

4.0

3.5

3.0

2.5

2.0

1.5

IMPEDANCE (Ω)

1.0

0.5

0

0.1 1 10

MAX7432 MAX7430 MAX7428

1 1 — IN1A

2 2 — IN2A

3 — — IN3A

4, 10 8 4 GND Ground

5 4 — IN1B

6 5 — IN2B

7 — — IN3B

8 6 6 DATA Serial Data Interface

9 — — OUT3 Buffer Output 3

11 7 — OUT2 Buffer Output 2

12 3 7 REXT

FREQUENCY (MHz)

PIN

MAX7428/30/32 toc10

500mV/div

OUT_

NAME FUNCTION

OUTPUT TRANSIENT DUE TO

INPUT MUX SWITCHING

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.

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.

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).

200ns/div

MAX7428/30/32 toc11

CROSSTALK (dB)

PASSBAND CHANNEL-TO-CHANNEL

CROSSTALK vs. FREQUENCY

-70

-75

-80

-85

-90

-95

0.1 1 10

BOOST = CODE 00

FREQUENCY (MHz)

MAX7428/30/32 toc12

Figure 1. MAX7428 Typical Application Circuit

MAX7428/MAX7430/MAX7432

Detailed Description

The MAX7428/MAX7430/MAX7432 filter and buffer the
outputs of DAC encoder chipsets that process digital
video information in applications such as set-top boxes,
hard-disk recorders, DVD players, recorders, and digi­tal VCRs. These devices also filter and “clean-up” ana­log video signals. Each channel in the MAX7428/
MAX7430/MAX7432 includes an input mux to select the
input channel, a 6th-order Sallen-Key filter with four
adjustable high-frequency boost levels, an output
buffer with a 6dB gain, a sync detector and clamp, and
an external resistor to set internal bias levels. Output
disable adds additional multiplexing in a wired-OR con­figuration. Filter bypass, in conjunction with the two
inputs, can be used to provide filtered and unfiltered
video signal processing. Maxim’s Single Pin Bus

(MSPB) interface controls all of the above features. An
external capacitor is used to assign each device a
unique address that allows control of up to 16 devices
on the same bus. Typical application circuits for the
MAX7428/MAX7430/MAX7432 are shown in Figures 1,
2, and 3.

Input Considerations

Use a 0.1µF ceramic capacitor to AC-couple the input
to the MAX7428/MAX7430/MAX7432. This input capaci­tor stores a DC level to level-shift the input signal to an
optimal point between VCCand GND. The ABSEL bit on
the Control Register sets which channel (IN_A or IN_B)
is selected (Control Register section). The IN_A and
IN_B inputs have a typical input resistance of 50kΩ.

Standard Definition Video Reconstruction
Filters and Buffers

6 _______________________________________________________________________________________

Pin Description (continued)

PIN

MAX7432 MAX7430 MAX7428

13 9 — OUT1 Buffer Output 1

14 10 2 V

—— 1 INA Video Input A. Use a 0.1µF series input capacitor for proper operation.

—— 3 INB Video Input B. Use a 0.1µF series input capacitor for proper operation.
—— 5 SYNCIO Sync Pulse Input or Output
—— 8 OUT Buffer Output

0.1µF

D/A

*1MΩ

0.1µF

D/A

ENCODER

*1MΩ

NAME FUNCTION

CC

INA

MAX7428

INB

GND

+5V Supply Voltage

5V

V

CC

OUT

REXT

DATA

SYNCIO

75Ω

75Ω

***

10kΩ

**220µF

C1

300kΩ

SYNC PULSE
IN OR OUT

**220µF

SERIAL I/O

5V

Z0 = 75Ω

Z

= 75Ω

0

C1 = 1nF TO 1µF (SEE TABLE 3)
*NEEDED ONLY IN FILTER BYPASS MODE
**OPTIONAL CAPACITOR
***ONLY ONE PULLUP RESISTOR NEEDED PER BUS

75Ω

75Ω

MAX7428/MAX7430/MAX7432

Standard Definition Video Reconstruction

Filters and Buffers

_______________________________________________________________________________________ 7

AUX IN

Figure 2. MAX7430 Typical Application Circuit

D/A

ENCODER

AUX IN

= 75Ω

Z

Z

0

Z

0

0

= 75Ω

Z

0

= 75Ω

75Ω

75Ω

= 75Ω

75Ω

0.1µF

0.1µF

0.1µF

*1MΩ

*1MΩ

IN1A

IN1B

IN2A

+5V

V

MAX7430

200µF**

75Ω

CC

OUT1

***

10kΩ

DATA

OUT2

75Ω

75Ω

75Ω

200µF**

+5V

SERIAL I/O

200µF**

200µF**

*1MΩ

0.1µF

D/A

ENCODER

*1MΩ

C1 = 1nF TO 1µF (SEE TABLE 3)
*NEEDED ONLY IN FILTER BYPASS MODE
**OPTIONAL OUTPUT CAPACITOR
***ONLY ONE PULLUP RESISTOR NEEDED PER BUS

IN2B

300kΩ

75Ω

REXT

C1

GND