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PDF MAX4159EEE Data sheet ( Hoja de datos )
| Número de pieza | MAX4159EEE | |
| Descripción | 350MHz/250MHz / 2-Channel Video Multiplexer-Amplifiers | |
| Fabricantes | Maxim Integrated | |
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19-1164; Rev 1; 3/97
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
_______________General Description ____________________________Features
The MAX4158/MAX4159/MAX4258/MAX4259 are wide-
band, 2-channel, noninverting video amplifiers with input
multiplexing, capable of driving ±2.5V signals into 50Ω or
75Ω loads. These devices are current-mode feedback
amplifiers; gain is set by external feedback resistors. The
MAX4158/MAX4159 are optimized for unity gain (0dB)
with a -3dB bandwidth of 350MHz. The MAX4258/
MAX4259 are optimized for gains of two (6dB) or more
with a 250MHz -3dB bandwidth. These devices have low
(0.01%/0.01°) differential gain and phase errors, and oper-
ate from ±5V supplies.
These devices are ideal for use in broadcast and graphics
video systems because of their low, 2pF input capaci-
tance, channel-to-channel switching time of only 20ns,
and wide, 130MHz 0.1dB bandwidth. In addition, the com-
bination of ultra-high speed and low power makes them
suitable for use in general-purpose high-speed applica-
tions, such as medical imaging, industrial instrumentation,
and communications systems.
o Excellent Video Specifications:
0.1dB Gain Flatness to 130MHz
0.01%/0.01° Differential Gain/Phase Error
o High Speed:
350MHz -3dB Bandwidth (MAX4158/4159)
250MHz -3dB Bandwidth (MAX4258/4259)
700V/µs Slew Rate (MAX4158/4159)
1000V/µs Slew Rate (MAX4258/4259)
20ns Settling Time to 0.1%
o Fast Switching:
20ns Channel-Switching Time
<70mV Switching Transient
o Low Power: 100mW
o Directly Drive 75Ω or 50Ω Cables
o High Output Current Drive: >70mA
o Address Latch and High-Z Output Disable
The MAX4159/MAX4259 have address latching and high-
impedance output disabling, allowing them to be incorpo-
rated into large switching arrays. They are available in
14-pin SO and 16-pin QSOP packages. The MAX4158/
MAX4258 have no address latching or output disabling,
but are available in space-saving 8-pin µMAX and SO
packages.
________________________Applications
Video-Signal Multiplexing
Video Crosspoint Switches
Pixel Switching
______________Ordering Information
PART
MAX4158ESA
MAX4158EUA
MAX4159ESD
MAX4159EEE
MAX4258ESA
MAX4258EUA
MAX4259ESD
MAX4259EEE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 µMAX
14 SO
16 QSOP
8 SO
8 µMAX
14 SO
16 QSOP
Coaxial Cable Drivers
Workstations
_________________Pin Configurations
High-Definition TV (HDTV)
TOP VIEW
Broadcast Video
Multimedia Products
MAX4158/MAX4258
High-Speed Signal Processing
IN0 1
GND 2
8 A0
7 OUT
MAX4158/MAX4258
A0 INPUT
IN1 3
6 V+
0 IN0
V- 4
5 FB
1 IN1
SO/µMAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
__________________________________________Typical Operating Characteristics
(V+ = +5V, V- = -5V, TA = +25°C, unless otherwise noted.)
MAX4158/MAX4159
SMALL-SIGNAL FREQUENCY RESPONSE
2
MAX4158/MAX4159
GAIN FLATNESS vs. FREQUENCY
0.2
MAX4158/MAX4159
LARGE-SIGNAL FREQUENCY RESPONSE
2
2Vp-p OUTPUT
000
-2 -0.2
-4
VIN = 20mVp-p
-6 AV = +1V/V
RF = 430Ω
RL = 100Ω
-8
1
10 100
FREQUENCY (MHz)
1000
MAX4258/MAX4259
SMALL-SIGNAL FREQUENCY RESPONSE
8
-0.4
VIN = 20mVp-p
-0.6 AV = +1V/V
RF = 430Ω
RL = 100Ω
-0.8
1 10
100
FREQUENCY (MHz)
1000
MAX4258/MAX4259
GAIN FLATNESS vs. FREQUENCY
6.2
-2
4Vp-p OUTPUT
-4
-6 AV = +1V/V
RF = 430Ω
RL = 100Ω
-8
1 10
100
FREQUENCY (MHz)
1000
MAX4258/MAX4259
LARGE-SIGNAL FREQUENCY RESPONSE
8
6 6.0
4 5.8
2
VIN = 20mVp-p
0 AV = +2V/V
RF = RG = 510Ω
RL = 100Ω
-2
1 10
100
FREQUENCY (MHz)
1000
5.6
5.4
5.2
1
VIN = 20mVp-p
AV = +2V/V
RF = RG = 510Ω
RL = 100Ω
10 100
FREQUENCY (MHz)
1000
MAX4159
OFF ISOLATION vs. FREQUENCY
20
IN0 = ±2V
0 IN1 = GND
-20 A0 = GND
EN = 5V
-40
-60
-80
-100
-120
-140 AV = +1V/V
-160
RL = 100Ω
RF = 430Ω
-180
1 10
100
FREQUENCY (MHz)
1000
MAX4259
OFF ISOLATION vs. FREQUENCY
20
IN0 = ±1V
0 IN1 = GND
-20 A0 = GND
EN = 5V
-40
-60
-80
-100
-120
-140 AV = +2V/V
-160
RL = 100Ω
RF = RG = 510Ω
-180
1 10
100
FREQUENCY (MHz)
1000
6 2Vp-p OUTPUT
4
4Vp-p OUTPUT
2
0 AV = +2V/V
RF = RG = 510Ω
RL = 100Ω
-2
1
10 100
FREQUENCY (MHz)
1000
MAX4158/MAX4159
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
10
0
-10
-20 PSRR(-)
-30
-40
-50
-60 PSRR(+)
-70 AV = +1V/V
-80
RL = 100Ω
RF = 430Ω
-90
0.01
0.1
1
10
FREQUENCY (MHz)
100
_______________________________________________________________________________________ 5
5 Page 
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
To realize the full AC performance of these high-speed
amplifiers, pay careful attention to power-supply
bypassing and board layout. The PC board should
have at least two layers: a signal and power layer on
one side, and a large, low-impedance ground plane on
the other side. The ground plane should be as free of
voids as possible, with one exception: the feedback pin
(FB) should have as low a capacitance to ground as
possible. This means that there should be no ground
plane under FB or under the components (RF and RG)
connected to it. With multilayer boards, locate the
ground plane on a layer that incorporates no signal or
power traces.
Regardless of whether or not a constant-impedance
board is used, it is best to observe the following guide-
lines when designing the board:
1) Do not use wire-wrap boards (they are much too
inductive) or breadboards (they are much too
capacitive).
2) Do not use IC sockets. IC sockets increase reac-
tances.
3) Keep lines as short and as straight as possible. Do
not make 90° turns; round all corners.
4) Observe high-frequency bypassing techniques to
maintain the amplifier’s accuracy and stability.
5) Bear in mind that, in general, surface-mount compo-
nents have shorter bodies and lower parasitic reac-
tance, giving much better high-frequency
performance than through-hole components.
The bypass capacitors should include a 10nF ceramic
surface-mount capacitor between each supply pin and
the ground plane, located as close to the package as
possible. Optionally, place a 10µF tantalum capacitor at
the power-supply pins’ points of entry to the PC board
to ensure the integrity of incoming supplies. The power-
supply trace should lead directly from the tantalum
capacitor to the V+ and V- pins. To minimize parasitic
inductance, keep PC traces short and use surface-
mount components.
Ground pins have been placed between input channels
to minimize crosstalk between the two input channels.
(The grounds extend inside the package all the way to
the silicon.) These pins should be connected to a com-
mon ground plane on the PC board.
Input termination resistors and output back-termination
resistors, if used, should be surface-mount types, and
should be placed as close to the IC pins as possible.
Choosing Feedback
_________________and Gain Resistors
As with all current-mode feedback amplifiers, the fre-
quency response of the MAX4158/MAX4159/MAX4258/
MAX4259 is critically dependent on the value of the
feedback resistor RF. RF, in conjunction with an internal
compensation capacitor, forms the dominant pole in the
feedback loop. Reducing RF’s value increases the pole
frequency and the -3dB bandwidth, but also increases
peaking due to interaction with other nondominant
poles. Increasing RF’s value reduces peaking and
bandwidth.
Tables 1 and 2 show optimal values for the feedback
resistor (RF) and gain-setting resistor (RG) for all parts.
Note that the MAX4258/MAX4259 offer superior AC per-
formance for all gains except unity gain (0dB). These
values provide optimal AC response using surface-
mount resistors and good layout techniques. The
MAX4159/MAX4259 evaluation kit provides a practical
example of such layout techniques.
Stray capacitance at FB causes feedback resistor
decoupling and produces peaking in the frequency-
response curve. Keep the capacitance at FB as low as
possible by using surface-mount resistors, and avoid-
ing the use of a ground plane beneath or beside these
resistors and the FB pin. Some capacitance is unavoid-
able; if necessary, its effects can be counteracted by
adjusting RF. 1% resistors are recommended to main-
tain consistency over a wide range of production lots.
Table 1. MAX4158/MAX4159 Bandwidth
and Gain vs. Gain-Setting Resistors
GAIN
(V/V) (dB)
10
26
5 14
10 20
RG
(Ω)
∞
110
32.5
14.5
RF
(Ω)
430
110
130
130
-3dB BW
(MHz)
350
200
80
40
0.1dB BW
(MHz)
100
110
12
6
______________________________________________________________________________________ 11
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