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PDF MAX4028EUE Data sheet ( Hoja de datos )
| Número de pieza | MAX4028EUE | |
| Descripción | Triple/Quad / 2:1 Video Multiplexer-Amplifiers with Input Clamps | |
| Fabricantes | Maxim Integrated | |
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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 ±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
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
PART
MAX4028
MAX4029
Selector Guide
NO. OF 2:1
MUX-AMPS
3
4
GAIN
2V/V
2V/V
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 ±10mVP-P Switching Transient
o 0.2% Differential Gain/0.4° Phase Error
o Low-Power, High-Impedance Disable Mode
PART
MAX4028EUE
MAX4028EWE
MAX4029EUP
MAX4029EWP
Ordering Information
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
75Ω CABLE
75Ω
75Ω CABLE
75Ω
75Ω CABLE
75Ω
75Ω CABLE
75Ω
CIN
0.1µF
IN1A
CLAMP
CIN
0.1µF
IN1B
CLAMP
CIN
0.1µF
IN2A
CLAMP
CIN
0.1µF
IN2B
CLAMP
RKEYREF
6kΩ
KEYREF
A/B
MAX4028
MAX4029
1kΩ
1kΩ
1kΩ
1kΩ
KEY/CLAMP
CONTROL
VCC
0.1µF
+5V
0.01µF
OUT1 75Ω 75Ω CABLE
OUT2 75Ω 75Ω CABLE
DISABLE
CLAMP/KEY_2
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.
1 page  
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.)
OUTPUT IMPEDANCE
vs. FREQUENCY
100
INPUT-VOLTAGE NOISE DENSITY
vs. FREQUENCY
1000
LARGE-SIGNAL TRANSIENT RESPONSE
MAX4028 toc12
VIN
500mV/div
1.6VDC
10 100
1 10
VOUT
1V/div
0.1
10k
100k 1M 10M 100M
FREQUENCY (Hz)
1G
1
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
SMALL-SIGNAL TRANSIENT RESPONSE
MAX4028 toc13
CHANNEL-SWITCHING TRANSIENT
MAX4028 toc14
VIN
25mV/div
1.6VDC
A/B
2.5V/div
5VDC
0VDC
A/B
2.5V/div
10ns/div
CHANNEL-SWITCHING TIME
(CHA = 1.5VDC, CHB = 1VDC)
MAX4028 toc15
5VDC
0VDC
SIGNAL 2
50mV/div
VOUT
20mV/div
VOUT
500mV/div
ENABLE
2.5V/div
VOUT
250mV/div
10ns/div
ENABLE RESPONSE TIME
(VOUT = 0.5V)
MAX4028 toc16
5VDC
0VDC
0.5VDC
50ns/div
0VDC
20ns/div
11
10
9
8
7
6
5
4
3
2
1
100k
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
CLOAD = 15pF
CLOAD = 10pF
CLOAD = 5pF
1M 10M 100M
FREQUENCY (Hz)
1G
20ns/div
OPTIMAL ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
30
25
20
15
10
5
0
0 50 100 150 200 250
CLOAD (pF)
_______________________________________________________________________________________ 5
5 Page 
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
The bypass capacitors should include a 0.1µF, ceramic
surface-mount capacitor between VCC and the ground
plane, located as close to the package as possible.
Optionally, place a 10µF capacitor at the power supply’s
point-of-entry to the PC board to ensure the integrity of
incoming supplies. The power-supply traces should lead
directly from the capacitor to the VCC pin. To minimize
parasitic inductance, keep PC traces short and use sur-
face-mount components.
If input termination resistors and output back-termination
resistors are used, they should be surface-mount types,
and should be placed as close to the IC pins as possible.
Pin Configurations
TOP VIEW
IN3A 1
IN2A 2
IN1A 3
A/B 4
KEYREF 5
IN1B 6
IN2B 7
IN3B 8
MAX4028
16 DISABLE
15 OUT1
14 VCC
13 OUT2
12 CLAMP/KEY_2
11 OUT3
10 GND
9 CLAMP/KEY_3
TSSOP/SO
IN4A 1
IN3A 2
IN2A 3
IN1A 4
A/B 5
KEYREF 6
IN1B 7
IN2B 8
IN3B 9
IN4B 10
MAX4029
20 CLAMP/KEY_4
19 DISABLE
18 OUT1
17 VCC
16 OUT2
15 CLAMP/KEY_2
14 OUT3
13 GND
12 CLAMP/KEY_3
11 OUT4
TSSOP/SO
Chip Information
TRANSISTOR COUNT: 1032
PROCESS: Bipolar
______________________________________________________________________________________ 11
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