EVALUATION KIT AVAILABLE
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
General Description
The MAX4028/MAX4029 are 5V, triple/quad, 2:1 voltage-
feedback 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
entertainment systems, video projectors, and displays/
TVs. Both devices have 20ns channel switching times
and low ±10mVP-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.
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
Ordering Information
PART
MAX4028EUE
MAX4028EWE
MAX4029EUP
MAX4029EWP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
16 Wide SO
20 TSSOP
20 Wide SO
Typical Operating Circuit
A/B
75Ω CABLE
C
IN
0.1µF
+5V
IN1A
CLAMP
C
IN
0.1µF
OUT1 75Ω
IN1B
CLAMP
C
IN
0.1µF
1kΩ
IN2A
CLAMP
C
IN
0.1µF
OUT2 75Ω
IN2B
CLAMP
1kΩ
KEYREF
R
KEYREF
6kΩ
KEY/CLAMP
CONTROL
CLAMP/KEY_2
DISABLE
1kΩ
1kΩ
75Ω CABLE
Applications
●
●
●
●
●
●
●
●
Blade Servers
Security Systems
Video Projectors
Displays and Digital Televisions
Broadcast and Graphics Video
Set-Top Boxes
Notebook Computers
Video Crosspoint Switching
MAX4028
MAX4029
V
CC
0.1µF
0.01µF
75Ω
75Ω CABLE
75Ω
75Ω CABLE
Selector Guide
PART
MAX4028
MAX4029
NO. OF 2:1
MUX-AMPS
3
4
GAIN
2V/V
2V/V
75Ω
75Ω CABLE
75Ω CABLE
75Ω
Pin Configurations appear at end of data sheet.
19-3240; Rev 1; 4/15
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Absolute Maximum Ratings
Supply Voltage (V
CC
to 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 V
CC
) ........................... (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
Note 1:
Do not short V
OUT
to V
CC
.
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
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.
DC Electrical Characteristics
PARAMETER
Operating Supply Voltage Range
Quiescent Supply Current
Disable Supply Current
Output Clamp Voltage
Input Clamping Current
Clamp Voltage Matching
Clamp Voltage Drift
Input Resistance
Output Resistance
Disable Output Resistance
Power-Supply Rejection Ratio
Voltage Gain
Channel-to-Channel Gain Matching
Output-Voltage High
Output-Voltage Low
Output Current
Logic-Low Threshold
Logic-High Threshold
Logic-Low Input Current
Logic-High Input Current
(V
CC
= +5V, GND = 0V, R
L
= 150Ω to GND, V
DISABLE
= +5V, R
KEYREF
= 6kΩ, C
IN
= 0.1µF to GND, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 2)
SYMBOL
V
CC
I
CC
CONDITIONS
Guaranteed by PSRR
MAX4028, R
L
= ∞
MAX4029, R
L
= ∞
V
DISABLE
= 0V
V
CLAMP
I
IN
∆V
CLAMP
R
IN
R
OUT
R
OUT
PSRR
A
VCL
∆A
VCL
V
OH
V
OL
I
OUT
V
IL
V
IH
I
IL
I
IH
V
IL
= 0V
V
IH
= V
CC
2.0
6.6
1.2
25
25
30
0.8
V
CLAMP
+ 2.4
V
CLAMP
V
DISABLE
= 0V
4.5V < V
CC
< 5.5V (Note 5)
48
1.9
Clamp (Note 3)
Key clamp (Note 4)
Input voltage = input clamp + 0.5V
Measured at output
MAX4028
MAX4029
0.32
MIN
4.5
29
38
9
11
0.4
1.1
5
10
80
7
0.7
2
58
2.0
±1
2.1
±2
18
TYP
MAX
5.5
40
55
15
20
0.48
UNITS
V
mA
mA
V
µA
mV
µV/°C
MΩ
Ω
kΩ
dB
V/V
%
V
V
mA
V
V
µA
µA
TC
VCLAMP
Measured at output
LOGIC INPUT CHARACTERISTICS (DISABLE , A/B, CLAMP/KEY_)
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Maxim Integrated
│
2
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
AC Electrical Characteristics
PARAMETER
Small-Signal -3dB Bandwidth
Large-Signal -3dB Bandwidth
Small-Signal 0.1dB Gain Flatness
Bandwidth
Large-Signal 0.1dB Gain Flatness
Bandwidth
Slew Rate
Settling Time to 0.1%
Power-Supply Rejection Ratio
Output Impedance
Differential Gain Error
Differential Phase Error
Group Delay
Peak Signal to RMS Noise
Channel-to-Channel Crosstalk
A/B Crosstalk
Off-Isolation
Droop
SWITCHING CHARACTERISTICS
Channel Switching Time
Enable Time
Disable Time
Switching Transient
Note
Note
Note
Note
(V
CC
= +5V, GND = 0V, R
L
= 150Ω to GND, V
DISABLE
= +5V, R
KEYREF
= 6kΩ, C
IN
= 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
SYMBOL
BW
SS
BW
LS
CONDITIONS
V
OUT
= 100mV
P-P
V
OUT
= 2V
P-P
MIN
TYP
210
130
30
30
300
20
55
0.7
0.2
0.4
1.0
70
73
91
108
2
20
0.1
0.1
±10
MAX
UNITS
MHz
MHz
MHz
MHz
V/µs
ns
dB
Ω
%
degrees
ns
dB
dB
dB
dB
%
ns
µs
µs
mV
P-P
BW
0.1dBSS
V
OUT
= 100mV
P-P
BW
0.1dBLS
V
OUT
= 2V
P-P
SR
t
S
PSRR
Z
O
DG
DP
D/dT
SNR
X
TALK
X
TALKAB
A
ISO
D
R
t
SW
t
ON
t
OFF
V
OUT
= 2V
P-P
V
OUT
= 2V step
f = 100kHz
f = 100kHz
5-step modulated staircase
5-step modulated staircase
f = 3.58MHz or 4.43MHz
100kHz to 30MHz
f = 100kHz
f = 100kHz
V
OUT
_ = 2V
P-P
, f = 100kHz
Guaranteed by input clamp current
2:
All devices are 100% production tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
3:
The clamp voltage at the input is V
CLAMP
(measured at the output) divided by gain + V
BE
.
4:
The key-clamp voltage is above the sync-tip clamp voltage by approximately 0.7V, and is adjusted by varying R
KEYREF
.
5:
Measured at f = 100Hz at thermal equilibrium.
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Maxim Integrated
│
3
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Typical Operating Characteristics
(V
CC
= +5V, GND = 0V, V
DISABLE
= +5V, R
L
= 150Ω to GND, C
IN
= 0.1µF, R
KEYREF
= 6.04kΩ ±1%, T
A
= +25°C, unless otherwise
noted.)
MAX4028 toc01
6
5
4
3
2
1
0
-1
-2
100k
1M
10M
FREQUENCY (Hz)
100M
6.0
GAIN FLATNESS (dB)
5.9
5.8
5.7
5.6
5.5
5.4
5.3
5.2
LARGE-SIGNAL BANDWIDTH (dB)
SMALL-SIGNAL BANDWIDTH (dB)
7
V
OUT
= 100mV
P-P
6.1
V
OUT
= 100mV
P-P
MAX4028 toc02
7
6
5
4
3
2
1
0
-1
-2
V
OUT
= 2V
P-P
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN (%)
MAX4028 toc05
LARGE-SIGNAL GAIN FLATNESS (dB)
6.1
6.0
5.9
5.8
5.7
5.6
5.5
5.4
5.3
5.2
V
OUT
= 2V
P-P
MAX4028 toc04
-10
-20
PSRR (dB)
100k
1M
10M
FREQUENCY (Hz)
100M
1G
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
1st
2nd
3rd
4th
5th
6th
-30
-40
-50
-60
1st
2nd
3rd
4th
5th
6th
-70
1k
10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
OFF-ISOLATION
vs. FREQUENCY
MAX4028 toc07
ALL-HOSTILE CROSSTALK (CHANNEL TO
CHANNEL) vs. FREQUENCY
MAX4028 toc08
-20
OFF-ISOLATION (dB)
-40
-60
-80
-100
-120
-140
100k
1M
10M
FREQUENCY (Hz)
100M
-10
-20
CROSSTALK (dB)
-30
-40
-50
-60
-70
-10
-20
CROSSTALK (dB)
-30
-40
-50
-60
-70
-80
-90
-100
1G
-80
10k
100k
1M
10M
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
FREQUENCY (Hz)
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Maxim Integrated
│
4
MAX4028 toc09
0
0
0
ALL-HOSTILE CROSSTALK (A TO B ON ANY
CHANNEL) vs. FREQUENCY
MAX4028 toc06
6.2
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
DIFFERENTIAL GAIN AND PHASE
0
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4028 toc03
8
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
6.2
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
8
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Typical Operating Characteristics (continued)
(V
CC
= +5V, GND = 0V, V
DISABLE
= +5V, R
L
= 150Ω to GND, C
IN
= 0.1µF, R
KEYREF
= 6.04kΩ ±1%, T
A
= +25°C, unless otherwise
noted.)
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX4028 toc10
INPUT-VOLTAGE NOISE DENSITY
vs. FREQUENCY
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
MAX4028 toc11
100
1000
LARGE-SIGNAL TRANSIENT RESPONSE
MAX4028 toc12
OUTPUT IMPEDANCE (Ω)
10
100
V
IN
500mV/div
1.6VDC
1
10
V
OUT
1V/div
0.1
10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
1
1
10
100
1k
10k
100k
1M
10ns/div
FREQUENCY (Hz)
SMALL-SIGNAL TRANSIENT RESPONSE
MAX4028 toc13
CHANNEL-SWITCHING TRANSIENT
MAX4028 toc14
CHANNEL-SWITCHING TIME
(CHA = 1.5VDC, CHB = 1VDC)
5VDC
MAX4028 toc15
5VDC
A/B
2.5V/div
V
IN
25mV/div
1.6VDC
A/B
2.5V/div
0VDC
0VDC
SIGNAL 2
50mV/div
V
OUT
20mV/div
V
OUT
500mV/div
10ns/div
20ns/div
20ns/div
ENABLE RESPONSE TIME
(V
OUT
= 0.5V)
SMALL-SIGNAL BANDWIDTH (dB)
5VDC
ENABLE
2.5V/div
0VDC
10
9
8
7
6
5
4
3
2
1
100k
1M
OPTIMAL ISOLATION RESISTANCE (Ω)
C
LOAD
= 15pF
C
LOAD
= 10pF
MAX4028 toc17
25
20
15
10
5
0
0.5VDC
V
OUT
250mV/div
0VDC
50ns/div
C
LOAD
= 5pF
10M
FREQUENCY (Hz)
100M
1G
0
50
100
150
200
250
C
LOAD
(pF)
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Maxim Integrated
│
5
MAX4028 toc18
MAX4028 toc16
11
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
OPTIMAL ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
30
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