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 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 fixedgain 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 (2VP-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
●●
●●
●●
●●
●●
●●
●●
●●
●● 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 ±10mVP-P Switching Transient
●● 0.2% Differential Gain/0.4° Phase Error
●● Low-Power, High-Impedance Disable Mode
Ordering Information
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
Typical Operating Circuit
A/B
Blade Servers
Security Systems
Video Projectors
Displays and Digital Televisions
Broadcast and Graphics Video
Set-Top Boxes
Notebook Computers
Video Crosspoint Switching
75Ω CABLE
CIN
0.1µF
75Ω CABLE
CIN
0.1µF
CIN
0.1µF
PART
NO. OF 2:1
MUX-AMPS
GAIN
MAX4028
3
2V/V
MAX4029
4
2V/V
Pin Configurations appear at end of data sheet.
75Ω
0.1µF
0.01µF
IN1B
OUT1 75Ω
75Ω CABLE
OUT2 75Ω
75Ω CABLE
1kΩ
1kΩ
IN2A
CLAMP
75Ω
75Ω CABLE
MAX4028
MAX4029
CLAMP
75Ω
75Ω CABLE
IN1A
+5V
VCC
CLAMP
75Ω
Selector Guide
19-3240; Rev 1; 4/15
Features
CIN
0.1µF
IN2B
1kΩ
CLAMP
1kΩ
DISABLE
KEYREF
RKEYREF
6kΩ
KEY/CLAMP
CONTROL
CLAMP/KEY_2
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Absolute Maximum Ratings
Supply Voltage (VCC to GND)..................................-0.3V to +6V
IN_A, IN_B, OUT_..................................... -0.3V to (VCC + 0.3V)
DISABLE, A/B, KEYREF, CLAMP/KEY_... -0.3V to (VCC + 0.3V)
Current Into IN_A, IN_B...................................................±0.5mA
Short-Circuit Duration (VOUT to GND).......................Continuous
Short-Circuit Duration (VOUT to VCC) ............................ (Note 1)
Continuous Power Dissipation (TA = +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
Note 1: Do not short VOUT to VCC.
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
(VCC = +5V, GND = 0V, RL = 150Ω to GND, VDISABLE = +5V, RKEYREF = 6kΩ, CIN = 0.1µF to GND, TA = TMIN to TMAX, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Operating Supply Voltage Range
VCC
Quiescent Supply Current
ICC
Disable Supply Current
VCLAMP
Input Clamping Current
IIN
Clamp Voltage Drift
Input Resistance
MIN
TYP
4.5
MAX
UNITS
5.5
V
MAX4028, RL = ∞
29
40
MAX4029, RL = ∞
38
55
MAX4028
9
15
MAX4029
11
20
0.4
0.48
Clamp (Note 3)
0.32
Key clamp (Note 4)
1.1
mA
V
5
Measured at output
10
mV
TCVCLAMP Measured at output
80
µV/°C
7
MW
∆VCLAMP
RIN
ROUT
Disable Output Resistance
ROUT
Power-Supply Rejection Ratio
PSRR
Voltage Gain
AVCL
VDISABLE = 0V
4.5V < VCC < 5.5V (Note 5)
VOH
Output-Voltage Low
VOL
Output Current
IOUT
µA
0.7
W
2
kW
48
58
1.9
2.0
2.1
V/V
±1
±2
%
∆AVCL
Output-Voltage High
18
mA
Input voltage = input clamp + 0.5V
Output Resistance
Channel-to-Channel Gain Matching
Guaranteed by PSRR
VDISABLE = 0V
Output Clamp Voltage
Clamp Voltage Matching
CONDITIONS
dB
VCLAMP
+ 2.4
V
VCLAMP
30
V
mA
LOGIC INPUT CHARACTERISTICS (DISABLE , A/B, CLAMP/KEY_)
Logic-Low Threshold
VIL
Logic-High Threshold
VIH
Logic-Low Input Current
IIL
VIL = 0V
Logic-High Input Current
IIH
VIH = VCC
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0.8
V
6.6
25
µA
1.2
25
µA
2.0
V
Maxim Integrated │ 2
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
AC Electrical Characteristics
(VCC = +5V, GND = 0V, RL = 150Ω to GND, VDISABLE = +5V, RKEYREF = 6kΩ, CIN = 0.1µF, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Small-Signal -3dB Bandwidth
BWSS
VOUT = 100mVP-P
210
MHz
Large-Signal -3dB Bandwidth
BWLS
VOUT = 2VP-P
130
MHz
Small-Signal 0.1dB Gain Flatness
Bandwidth
BW0.1dBSS VOUT = 100mVP-P
30
MHz
Large-Signal 0.1dB Gain Flatness
Bandwidth
BW0.1dBLS VOUT = 2VP-P
30
MHz
Slew Rate
SR
VOUT = 2VP-P
300
V/µs
Settling Time to 0.1%
tS
VOUT = 2V step
20
ns
Power-Supply Rejection Ratio
PSRR
f = 100kHz
55
dB
Output Impedance
ZO
f = 100kHz
0.7
W
Differential Gain Error
DG
5-step modulated staircase
0.2
%
Differential Phase Error
DP
5-step modulated staircase
0.4
degrees
D/dT
f = 3.58MHz or 4.43MHz
1.0
ns
SNR
Group Delay
Peak Signal to RMS Noise
Channel-to-Channel Crosstalk
A/B Crosstalk
Off-Isolation
Droop
100kHz to 30MHz
70
dB
XTALK
f = 100kHz
73
dB
XTALKAB
f = 100kHz
91
dB
VOUT_ = 2VP-P, f = 100kHz
108
dB
AISO
DR
Guaranteed by input clamp current
2
%
SWITCHING CHARACTERISTICS
Channel Switching Time
tSW
20
ns
Enable Time
tON
0.1
µs
Disable Time
tOFF
0.1
µs
±10
mVP-P
Switching Transient
Note
Note
Note
Note
2: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
3: The clamp voltage at the input is VCLAMP (measured at the output) divided by gain + VBE.
4: The key-clamp voltage is above the sync-tip clamp voltage by approximately 0.7V, and is adjusted by varying RKEYREF.
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
(VCC = +5V, GND = 0V, VDISABLE = +5V, RL = 150Ω to GND, CIN = 0.1µF, RKEYREF = 6.04kΩ ±1%, TA = +25°C, unless otherwise
noted.)
4
3
2
1
5.9
5.8
5.7
5.6
5.5
0
5.4
-1
5.3
100M
5
4
3
2
1
0
1M
100k
10M
100M
-2
1G
100k
1M
10M
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
DIFFERENTIAL GAIN AND PHASE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
5.9
5.8
5.7
5.6
5.5
5.4
5.3
1M
10M
100M
1G
0
-10
-20
1st
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
2nd
3rd
4th
5th
6th
-30
-40
-50
-60
1st
2nd
3rd
4th
5th
-70
6th
1k
10k
100k
-80
-100
-10
-30
-40
-50
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1G
1G
-80
-30
-40
-50
-60
-70
-80
-70
100M
-20
-20
-60
-120
0
-10
CROSSTALK (dB)
-60
FREQUENCY (Hz)
100M
MAX4028 toc09
0
CROSSTALK (dB)
-40
10M
10M
ALL-HOSTILE CROSSTALK (A TO B ON ANY
CHANNEL) vs. FREQUENCY
MAX4028 toc08
-20
OFF-ISOLATION (dB)
ALL-HOSTILE CROSSTALK (CHANNEL TO
CHANNEL) vs. FREQUENCY
MAX4028 toc07
0
1M
1M
FREQUENCY (Hz)
OFF-ISOLATION
vs. FREQUENCY
100k
1G
MAX4028 toc06
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
FREQUENCY (Hz)
-140
100M
FREQUENCY (Hz)
VOUT = 2VP-P
100k
6
FREQUENCY (Hz)
6.0
5.2
5.2
1G
VOUT = 2VP-P
7
-1
PSRR (dB)
6.1
10M
8
MAX4028 toc05
6.2
1M
DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN (%)
100k
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX4028 toc03
6.0
GAIN FLATNESS (dB)
5
VOUT = 100mVP-P
6.1
LARGE-SIGNAL BANDWIDTH (dB)
VOUT = 100mVP-P
6
-2
LARGE-SIGNAL GAIN FLATNESS (dB)
6.2
MAX4028 toc01
7
MAX4028 toc04
SMALL-SIGNAL BANDWIDTH (dB)
8
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4028 toc02
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
-90
10k
100k
1M
10M
FREQUENCY (Hz)
100M
1G
-100
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Maxim Integrated │ 4
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Typical Operating Characteristics (continued)
(VCC = +5V, GND = 0V, VDISABLE = +5V, RL = 150Ω to GND, CIN = 0.1µF, RKEYREF = 6.04kΩ ±1%, TA = +25°C, unless otherwise
noted.)
INPUT-VOLTAGE NOISE DENSITY
vs. FREQUENCY
OUTPUT IMPEDANCE (Ω)
10
1
10k
100k
1M
10M
100M
1G
MAX4028 toc12
VIN
500mV/div
100
10
1.6VDC
VOUT
1V/div
1
0.1
LARGE-SIGNAL TRANSIENT RESPONSE
1000
MAX4028 toc11
MAX4028 toc10
100
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
OUTPUT IMPEDANCE
vs. FREQUENCY
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
SMALL-SIGNAL TRANSIENT RESPONSE
CHANNEL-SWITCHING TRANSIENT
MAX4028 toc13
10ns/div
1M
CHANNEL-SWITCHING TIME
(CHA = 1.5VDC, CHB = 1VDC)
MAX4028 toc15
MAX4028 toc14
5VDC
5VDC
VIN
25mV/div
1.6VDC
A/B
2.5V/div
A/B
2.5V/div
0VDC
0VDC
VOUT
500mV/div
VOUT
20mV/div
20ns/div
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
OPTIMAL ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
11
5VDC
ENABLE
2.5V/div
0VDC
0.5VDC
VOUT
250mV/div
0VDC
SMALL-SIGNAL BANDWIDTH (dB)
MAX4028 toc16
9
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CLOAD = 10pF
8
7
6
5
4
CLOAD = 5pF
3
2
1
50ns/div
CLOAD = 15pF
10
100k
1M
10M
FREQUENCY (Hz)
100M
1G
30
MAX4028 toc18
ENABLE RESPONSE TIME
(VOUT = 0.5V)
MAX4028 toc17
20ns/div
10ns/div
OPTIMAL ISOLATION RESISTANCE (Ω)
SIGNAL 2
50mV/div
25
20
15
10
5
0
0
50
100
150
200
250
CLOAD (pF)
Maxim Integrated │ 5
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Typical Operating Characteristics (continued)
(VCC = +5V, GND = 0V, VDISABLE = +5V, RL = 150Ω to GND, CIN = 0.1µF, RKEYREF = 6.04kΩ ±1%, TA = +25°C, unless otherwise
noted.)
KEY-CLAMP REFERENCE VOLTAGE
vs. RKEYREF
CLAMP VOLTAGE
vs. TEMPERATURE
CLAMP VOLTAGE (V)
0.41
0.40
0.39
0.38
0.37
-50
-25
0
25
50
75
100
MAX4028 toc20
0.42
1.8
KEY-CLAMP REFERENCE VOLTAGE (V)
MAX4028 toc19
0.43
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1
3
5
7
9
11
13
RKEYREF (kΩ)
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
MAX4028
MAX4029
—
1
IN4A
Amplifier Input 4A
1
2
IN3A
Amplifier Input 3A
2
3
IN2A
Amplifier Input 2A
3
4
IN1A
Amplifier Input 1A
4
5
A/B
5
6
KEYREF
6
7
IN1B
Amplifier Input 1B
7
8
IN2B
Amplifier Input 2B
Channel-Select Input. Drive A/B high or leave unconnected to select channel A.
Drive A/B low to select channel B.
Key-Clamp Reference Output. Connect an external resistor from KEYREF to GND to
generate the key-clamp voltage.
8
9
IN3B
Amplifier Input 3B
—
10
IN4B
Amplifier Input 4B
—
11
OUT4
Amplifier Output 4
9
12
CLAMP/KEY_3
10
13
GND
Ground
11
14
OUT3
Amplifier Output 3
12
15
CLAMP/KEY_2
13
16
OUT2
14
17
VCC
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Output 3 Clamp or Key-Clamp Input. Drive CLAMP/KEY_3 high to clamp OUT3.
Drive CLAMP/KEY_3 low to key clamp OUT3.
Output 2 Clamp or Key-Clamp Input. Drive CLAMP/KEY_2 high to clamp OUT2.
Drive CLAMP/KEY_2 low to key clamp OUT2.
Amplifier Output 2
Power-Supply Voltage. Bypass VCC to GND with 0.1µF and 0.01µF capacitors as
close as possible to the pin.
Maxim Integrated │ 6
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Pin Description (continued)
PIN
NAME
MAX4028
MAX4029
15
18
OUT1
16
19
DISABLE
—
20
CLAMP/KEY_4
FUNCTION
Amplifier Output 1
Disable Input. Pull DISABLE high for normal operation. Drive DISABLE low to disable
all outputs.
Output 4 Clamp or Key-Clamp Input. Drive CLAMP/KEY_4 high to clamp OUT4.
Drive CLAMP/KEY_4 low to key clamp OUT4.
Detailed Description
VCC
IN1A
CLAMP
OUT1
IN1B
1kΩ
CLAMP
1kΩ
IN2A
CLAMP/
KEY
CLAMP
OUT2
IN2B
CLAMP/KEY_2
CLAMP/
KEY
CLAMP
1kΩ
1kΩ
IN3A
CLAMP/
KEY
CLAMP
OUT3
IN3B
CLAMP/KEY_3
CLAMP/
KEY
CLAMP
1kΩ
1kΩ
A/B
CLAMP/
KEY
CLAMP
OUT4
IN4B
KEYREF
The MAX4028/MAX4029 have a -3dB large-signal (2VP-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.
Sync Tip and Key Clamps
IN4A
CLAMP/KEY_4
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 IN1_ channel, while the remaining inputs can be
clamped to either the video sync tip of the respective input
channel (IN_A and IN_B) 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 fixedgain 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 both high-speed video switching applications
such as OSD insertion.
CLAMP/
KEY
CLAMP
1kΩ
1kΩ
CLAMP
VOLTAGE
MAX4029
GND
Figure 1. MAX4029 Functional Diagram
DISABLE
The MAX4028/MAX4029 have AC-coupled inputs, with
either a sync tip or key clamp to provide bias for the video
signal. Channel 1 of the MAX4028/MAX4029 always has a
sync tip clamp at the input, while the remaining channels
are selectable as either sync tip or key clamps to accommodate the various video waveforms (see the Clamp/
Key-Clamp Settings for Video Formats section). The value
of the sync-tip clamp voltage is set internally for the lowest value, consistent with linear operation, and cannot be
adjusted. The key-clamp voltage is adjustable, to compensate for variations in the voltage between component video
inputs such as Linear RGB, YPbPr, and Y-C, by varying
RKEYREF. The key-clamp voltage can be computed from:
VKey-Clamp = 0.40 + 2000/[(5000 x RKEYREF)/
(5000 + RKEYREF)]
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Maxim Integrated │ 7
MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
Therefore, a 6kΩ resistor will produce a 1.13V
key-clamp voltage as shown in Figure 2. The clamp
voltage (VCLAMP) is measured at the output; the voltage
at the input is VCLAMP (sync tip or key clamp) divided by
the gain (+2V/V) + VBE.
In order for these clamps (sync tip or key) to work
properly, the input must be coupled with a 0.1µF capacitor (typ) with low leakage (
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