MAXIM MAX4028, MAX4029 Technical data

General Description

The MAX4028/MAX4029 are 5V, triple/quad, 2:1 voltage­feedback multiplexer-amplifiers with input clamps and a
fixed gain of +2V/V (6dB). Channel 1 (IN1A and IN1B)
inputs are clamped to the video sync tip of the input sig­nal, while the remaining inputs can be clamped to either
the video sync tip or the video sync of channel 1 (IN1_).
The latter is referred to as a key clamp and is pin selec­table. Selectable clamp/key-clamp inputs and fixed-gain
video output buffers make the MAX4028/MAX4029 ideal
for video-source switching applications such as automo­tive entertainment systems, video projectors, and dis­plays/TVs. Both devices have 20ns channel switching
times and low ±10mV

P-P

switching transients, making
them ideal for high-speed video switching applications
such as on-screen display (OSD) insertion.

The MAX4028/MAX4029 have a -3dB large-signal (2V

P-P

)
bandwidth of 130MHz, a -3dB small-signal bandwidth of
210MHz, and a 300V/µs slew rate. Low differential gain
and phase errors of 0.2% and 0.4°, respectively, make
these devices ideal for broadcast video applications.

The MAX4028/MAX4029 are specified over the -40°C to
+85°C extended temperature range and are offered in
16-pin and 20-pin TSSOP/SO packages.

Applications

In-Car Navigation/Entertainment

Blade Servers

Security Systems

Video Projectors

Displays and Digital Televisions

Broadcast and Graphics Video

Set-Top Boxes

Notebook Computers

Video Crosspoint Switching

Features

♦ Single +5V Operation
♦ Independently Selectable Sync-Tip or

Key-Clamp Inputs

♦ Adjustable Key-Clamp Voltage
♦ 130MHz Large-Signal -3dB Bandwidth
♦ 210MHz Small-Signal -3dB Bandwidth
♦ 300V/µs Slew Rate
♦ 20ns Switching Time
♦ Ultra-Low ±10mV

P-P

Switching Transient

♦ 0.2% Differential Gain/0.4° Phase Error
♦ Low-Power, High-Impedance Disable Mode

MAX4028/MAX4029

Triple/Quad, 2:1 Video

Multiplexer-Amplifiers with Input Clamps

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX4028
MAX4029

75Ω

75Ω

IN1A

V

CC

OUT1

CLAMP

A/B

+5V

C

IN

0.1µF

0.01µF

0.1µF

1kΩ

1kΩ

C

IN

0.1µF

IN1B

CLAMP

75Ω

75Ω

IN2A

OUT2

DISABLE

CLAMP/KEY_2

CLAMP

C

IN

0.1µF

R

KEYREF

6kΩ

1kΩ

1kΩ

C

IN

0.1µF

IN2B

KEYREF

CLAMP

KEY/CLAMP

CONTROL

75Ω CABLE

75Ω CABLE

75Ω CABLE

75Ω CABLE

75Ω

75Ω CABLE

75Ω

75Ω CABLE

Typical Operating Circuit

19-3240; Rev 0; 3/04

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.

EVALUATION KIT

AVAILABLE

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX4028EUE

-40°C to +85°C 16 TSSOP

MAX4028EWE

-40°C to +85°C 16 Wide SO

MAX4029EUP

-40°C to +85°C 20 TSSOP

MAX4029EWP

-40°C to +85°C 20 Wide SO

Selector Guide

PART

NO. OF 2:1

MUX-AMPS

GAIN

MAX4028 3 2V/V

MAX4029 4 2V/V

MAX4028/MAX4029

Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +5V, GND = 0V, RL= 150Ω to GND, V

DISABLE

= +5V, R

KEYREF

= 6kΩ, CIN= 0.1µF to GND, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at T

A

= +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.

Supply Voltage (VCCto GND) ..................................-0.3V to +6V

IN_A, IN_B, OUT_.......................................-0.3V to (V

CC

+ 0.3V)

DISABLE, A/B, KEYREF, CLAMP/KEY_......-0.3V to (V

CC

+ 0.3V)

Current Into IN_A, IN_B ...................................................±0.5mA

Short-Circuit Duration (V

OUT

to GND)........................Continuous

Short-Circuit Duration (V

OUT

to VCC) .............................(Note 1)

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP (derate 9.4mW/°C above +70°C) .........755mW

16-Pin Wide SO (derate 9.5mW/°C above +70°C) ......762mW

20-Pin TSSOP (derate 11mW/°C above +70°C) ..........879mW

20-Pin Wide SO (derate 10mW/°C above +70°C) .......800mW

Operating Temperature Range ...........................-40°C to +85°C

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

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

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

PARAMETER

CONDITIONS MIN TYP MAX

UNITS

Operating Supply Voltage Range V

CC

Guaranteed by PSRR 4.5 5.5 V

MAX4028, RL = ∞ 29 40

Quiescent Supply Current I

CC

MAX4029, RL = ∞ 38 55

mA

MAX4028 9 15

Disable Supply Current V

DISABLE

= 0V

MAX4029 11 20

mA

Clamp (Note 3) 0.32 0.4 0.48

Output Clamp Voltage V

CLAMP

Key clamp (Note 4) 1.1

V

Input Clamping Current I

IN

Input voltage = input clamp + 0.5V 5 18 µA

Clamp Voltage Matching

Measured at output 10 mV

Clamp Voltage Drift

Measured at output 80

µV/°C

Input Resistance R

IN

7

MΩ

Output Resistance R

OUT

0.7 Ω

Disable Output Resistance R

OUT

V

DISABLE

= 0V 2 kΩ

Power-Supply Rejection Ratio PSRR 4.5V < VCC < 5.5V (Note 5) 48 58 dB

Voltage Gain A

VCL

1.9 2.0 2.1 V/V

Channel-to-Channel Gain Matching

∆A

VCL

±1 ±2 %

Output-Voltage High V

OH

V

CLAMP

+ 2.4

V

Output-Voltage Low V

OL

V

Output Current I

OUT

30 mA

LOGIC INPUT CHARACTERISTICS (DISABLE , A/B, CLAMP/KEY_)

Logic-Low Threshold V

IL

0.8 V

Logic-High Threshold V

IH

2.0 V

Logic-Low Input Current I

IL

VIL = 0V 6.6 25 µA

Logic-High Input Current I

IH

VIH = V

CC

1.2 25 µA

Note 1: Do not short V

OUT

to VCC.

SYMBOL

∆V

TC

CLAMP

VCLAMP

V

CLAMP

MAX4028/MAX4029

Triple/Quad, 2:1 Video

Multiplexer-Amplifiers with Input Clamps

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(VCC= +5V, GND = 0V, RL= 150Ω to GND, V

DISABLE

= +5V, R

KEYREF

= 6kΩ, CIN= 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

A

= +25°C.)

Note 2: All devices are 100% production tested at T

A

= +25°C. Specifications over temperature are guaranteed by design.

Note 3: The clamp voltage at the input is V

CLAMP

(measured at the output) divided by gain + VBE.

Note 4: The key-clamp voltage is above the sync-tip clamp voltage by approximately 0.7V, and is adjusted by varying R

KEYREF

.

Note 5: Measured at f = 100Hz at thermal equilibrium.

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

Small-Signal -3dB Bandwidth BW

SS

V

OUT

= 100mV

P-P

210

MHz

Large-Signal -3dB Bandwidth BW

LS

V

OUT

= 2V

P-P

130

MHz

Small-Signal 0.1dB Gain Flatness
Bandwidth

V

OUT

= 100mV

P-P

30

MHz

Large-Signal 0.1dB Gain Flatness
Bandwidth

V

OUT

= 2V

P-P

30

MHz

Slew Rate SR V

OUT

= 2V

P-P

300 V/µs

Settling Time to 0.1% t

S

V

OUT

= 2V step 20 ns

Power-Supply Rejection Ratio PSRR f = 100kHz 55 dB

Output Impedance Z

O

f = 100kHz 0.7 Ω

Differential Gain Error DG 5-step modulated staircase 0.2 %

Differential Phase Error DP 5-step modulated staircase 0.4

degrees

Group Delay D/dT f = 3.58MHz or 4.43MHz 1.0 ns

Peak Signal to RMS Noise SNR 100kHz to 30MHz 70 dB

Channel-to-Channel Crosstalk X

TALK

f = 100kHz 73 dB

A/B Crosstalk

f = 100kHz 91 dB

Off-Isolation A

ISO

V

OUT_

= 2V

P-P

, f = 100kHz 108 dB

Droop D

R

Guaranteed by input clamp current 2 %

SWITCHING CHARACTERISTICS

Channel Switching Time t

SW

20 ns

Enable Time t

ON

0.1 µs

Disable Time t

OFF

0.1 µs

Switching Transient ±10

mV

P-P

BW

BW

X

0.1dBSS

0.1dBLS

TALKAB

MAX4028/MAX4029

Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +5V, GND = 0V, V

DISABLE

= +5V, RL= 150Ω to GND, CIN= 0.1µF, R

KEYREF

= 6.04kΩ ±1%, TA= +25°C, unless otherwise

noted.)

SMALL-SIGNAL BANDWIDTH

vs. FREQUENCY

MAX4028 toc01

FREQUENCY (Hz)

SMALL-SIGNAL BANDWIDTH (dB)

100M10M1M

-1

0

1

2

3

4

5

6

7

8

-2
100k 1G

V

OUT

= 100mV

P-P

SMALL-SIGNAL GAIN FLATNESS

vs. FREQUENCY

MAX4028 toc02

FREQUENCY (Hz)

GAIN FLATNESS (dB)

100M10M1M

5.3

5.4

5.5

5.6

5.7

5.8

5.9

6.0

6.1

6.2

5.2
100k 1G

V

OUT

= 100mV

P-P

LARGE-SIGNAL BANDWIDTH

vs. FREQUENCY

MAX4028 toc03

FREQUENCY (Hz)

LARGE-SIGNAL BANDWIDTH (dB)

100M10M1M

-1

0

1

2

3

4

5

6

7

8

-2
100k 1G

V

OUT

= 2V

P-P

LARGE-SIGNAL GAIN FLATNESS

vs. FREQUENCY

MAX4028 toc04

FREQUENCY (Hz)

LARGE-SIGNAL GAIN FLATNESS (dB)

100M10M1M

5.3

5.4

5.5

5.6

5.7

5.8

5.9

6.0

6.1

6.2

5.2
100k 1G

V

OUT

= 2V

P-P

DIFFERENTIAL GAIN AND PHASE

MAX4028 toc05

DIFFERENTIAL GAIN (%)

6th

5th4th3rd2nd

-0.1

-0.2

-0.3

0

0.1

0.2

0.3

1st

DIFFERENTIAL PHASE (deg)

6th

5th4th3rd2nd

-0.02

-0.04

-0.06

0

0.02

0.04

0.06

1st

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX4028 toc06

FREQUENCY (Hz)

PSRR (dB)

100M10M1M100k10k

-60

-50

-40

-30

-20

-10

0

-70
1k 1G

OFF-ISOLATION

vs. FREQUENCY

MAX4028 toc07

FREQUENCY (Hz)

OFF-ISOLATION (dB)

100M10M1M

-120

-100

-80

-60

-40

-20

0

-140
100k 1G

ALL-HOSTILE CROSSTALK (CHANNEL TO

CHANNEL) vs. FREQUENCY

MAX4028 toc08

FREQUENCY (Hz)

CROSSTALK (dB)

100M10M100k 1M

-70

-60

-50

-40

-30

-20

-10

0

-80
10k 1G

ALL-HOSTILE CROSSTALK (A TO B ON ANY

CHANNEL) vs. FREQUENCY

MAX4028 toc09

FREQUENCY (Hz)

CROSSTALK (dB)

100M10M1M

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-100
100k 1G