19-3240; Rev 0; 3/04
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 sig-
nal, 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 selec-
table. Selectable clamp/key-clamp inputs and fixed-gain
video output buffers make the MAX4028/MAX4029 ideal
for video-source switching applications such as automo-
tive entertainment systems, video projectors, and dis-
plays/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.
Features
o
Single +5V Operation
o
Independently Selectable Sync-Tip or
Key-Clamp Inputs
o
Adjustable Key-Clamp Voltage
o
130MHz Large-Signal -3dB Bandwidth
o
210MHz Small-Signal -3dB Bandwidth
o
300V/µs Slew Rate
o
20ns Switching Time
o
Ultra-Low ±10mV
P-P
Switching Transient
o
0.2% Differential Gain/0.4° Phase Error
o
Low-Power, High-Impedance Disable Mode
MAX4028/MAX4029
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
Applications
In-Car Navigation/Entertainment
Blade Servers
Security Systems
Video Projectors
75Ω
75Ω CABLE
C
IN
0.1µF
Typical Operating Circuit
A/B
V
CC
IN1A
CLAMP
C
IN
0.1µF
OUT1
75Ω
IN1B
CLAMP
1kΩ
C
IN
0.1µF
IN2A
CLAMP
C
IN
0.1µF
OUT2
75Ω
IN2B
CLAMP
1kΩ
KEYREF
R
KEYREF
6kΩ
KEY/CLAMP
CONTROL
CLAMP/KEY_2
DISABLE
1kΩ
75Ω CABLE
1kΩ
75Ω CABLE
+5V
MAX4028
MAX4029
0.1µF
0.01µF
Displays and Digital Televisions
Broadcast and Graphics Video
Set-Top Boxes
Notebook Computers
Video Crosspoint Switching
75Ω CABLE
75Ω CABLE
75Ω
75Ω
Selector Guide
PART
MAX4028
MAX4029
NO. OF 2:1
MUX-AMPS
3
4
GAIN
2V/V
2V/V
75Ω CABLE
75Ω
Pin Configurations appear 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.
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
MAX4028/MAX4029
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
.
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.
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
DC ELECTRICAL CHARACTERISTICS
(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)
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
CLAMP
I
IN
∆V
CLAMP
TC
VCLAMP
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
SYMBOL
V
CC
I
CC
CONDITIONS
Guaranteed by PSRR
MAX4028, R
L
=
∞
MAX4029, R
L
=
∞
V
DISABLE
= 0V
Clamp (Note 3)
Key clamp (Note 4)
Input voltage = input clamp + 0.5V
Measured at output
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
LOGIC INPUT CHARACTERISTICS (DISABLE , A/B, CLAMP/KEY_)
2
_______________________________________________________________________________________
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
AC ELECTRICAL CHARACTERISTICS
(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.)
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
t
SW
t
ON
t
OFF
20
0.1
0.1
±10
ns
µs
µs
mV
P-P
SYMBOL
BW
SS
BW
LS
BW
0.1dBSS
BW
0.1dBLS
SR
t
S
PSRR
Z
O
DG
DP
D/dT
SNR
X
TALK
X
TALKAB
A
ISO
D
R
CONDITIONS
V
OUT
= 100mV
P-P
V
OUT
= 2V
P-P
V
OUT
= 100mV
P-P
V
OUT
= 2V
P-P
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
MIN
TYP
210
130
30
30
300
20
55
0.7
0.2
0.4
1.0
70
73
91
108
2
MAX
UNITS
MHz
MHz
MHz
MHz
V/µs
ns
dB
Ω
%
degrees
ns
dB
dB
dB
dB
%
MAX4028/MAX4029
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 + V
BE
.
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.
_______________________________________________________________________________________
3
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
MAX4028/MAX4029
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.)
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX4028 toc01
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX4028 toc02
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
7
LARGE-SIGNAL BANDWIDTH (dB)
6
5
4
3
2
1
0
-1
-2
V
OUT
= 2V
P-P
MAX4028 toc03
8
7
SMALL-SIGNAL BANDWIDTH (dB)
6
5
4
3
2
1
0
-1
-2
100k
1M
10M
FREQUENCY (Hz)
100M
V
OUT
= 100mV
P-P
6.2
6.1
6.0
GAIN FLATNESS (dB)
5.9
5.8
5.7
5.6
5.5
5.4
5.3
5.2
V
OUT
= 100mV
P-P
8
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN (%)
MAX4028 toc04
DIFFERENTIAL GAIN AND PHASE
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
MAX4028 toc05
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4028 toc06
6.2
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
100k
1M
10M
FREQUENCY (Hz)
100M
V
OUT
= 2V
P-P
0
-10
-20
PSRR (dB)
-30
-40
-50
-60
1st
2nd
3rd
4th
5th
6th
1G
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
ALL-HOSTILE CROSSTALK (A TO B ON ANY
CHANNEL) vs. FREQUENCY
-10
-20
CROSSTALK (dB)
-30
-40
-50
-60
-70
MAX4028 toc09
0
-20
OFF-ISOLATION (dB)
-40
-60
-80
-100
-120
-140
100k
1M
10M
FREQUENCY (Hz)
100M
0
-10
-20
CROSSTALK (dB)
-30
-40
-50
-60
-70
-80
0
-80
-90
-100
10k
100k
1M
10M
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
FREQUENCY (Hz)
1G
4
_______________________________________________________________________________________
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
MAX4028/MAX4029
INPUT-VOLTAGE NOISE DENSITY
vs. FREQUENCY
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
MAX4028 toc11
LARGE-SIGNAL TRANSIENT RESPONSE
MAX4028 toc12
100
1000
OUTPUT IMPEDANCE (Ω)
10
V
IN
500mV/div
1.6VDC
100
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)
MAX4028 toc15
5VDC
V
IN
25mV/div
1.6VDC
A/B
2.5V/div
0VDC
A/B
2.5V/div
5VDC
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)
MAX4028 toc16
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX4028 toc17
OPTIMAL ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
OPTIMAL ISOLATION RESISTANCE (Ω)
MAX4028 toc18
11
SMALL-SIGNAL BANDWIDTH (dB)
5VDC
10
9
8
7
6
5
4
3
2
1
100k
1M
10M
FREQUENCY (Hz)
100M
C
LOAD
= 5pF
C
LOAD
= 10pF
C
LOAD
= 15pF
30
25
20
15
10
5
0
ENABLE
2.5V/div
0VDC
0.5VDC
V
OUT
250mV/div
0VDC
50ns/div
1G
0
50
100
150
200
250
C
LOAD
(pF)
_______________________________________________________________________________________
5
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