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PDF MAX4223EUT-T Data sheet ( Hoja de datos )
| Número de pieza | MAX4223EUT-T | |
| Descripción | 1GHz / Low-Power / SOT23 / Current-Feedback Amplifiers with Shutdown | |
| Fabricantes | Maxim Integrated | |
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19-1230; Rev 2a; 6/97
EVAALVUAAILTAIOBNLEKIT
1GHz, Low-Power, SOT23,
Current-Feedback Amplifiers with Shutdown
_______________General Description
The MAX4223–MAX4228 current-feedback amplifiers
combine ultra-high-speed performance, low distortion,
and excellent video specifications with low-power oper-
ation. The MAX4223/MAX4224/MAX4226/MAX4228
have a shutdown feature that reduces power-supply
current to 350µA and places the outputs into a high-
impedance state. These devices operate with dual sup-
plies ranging from ±2.85V to ±5.5V and provide a
typical output drive current of 80mA. The MAX4223/
MAX4225/MAX4226 are optimized for a closed-loop
gain of +1 (0dB) or more and have a -3dB bandwidth of
1GHz, while the MAX4224/MAX4227/MAX4228 are
compensated for a closed-loop gain of +2 (6dB) or
more, and have a -3dB bandwidth of 600MHz (1.2GHz
gain-bandwidth product).
The MAX4223–MAX4228 are ideal for professional video
applications, with differential gain and phase errors of
0.01% and 0.02°, 0.1dB gain flatness of 300MHz, and a
1100V/µs slew rate. Total harmonic distortion (THD) of
-60dBc (10MHz) and an 8ns settling time to 0.1% suit
these devices for driving high-speed analog-to-digital
inputs or for data-communications applications. The low-
power shutdown mode on the MAX4223/MAX4224/
MAX4226/MAX4228 makes them suitable for portable
and battery-powered applications. Their high output
impedance in shutdown mode is excellent for multiplex-
ing applications.
The single MAX4223/MAX4224 are available in space-
saving 6-pin SOT23 packages. All devices are available
in the extended -40°C to +85°C temperature range.
________________________Applications
ADC Input Buffers
Data Communications
Video Cameras
Video Line Drivers
Video Switches
Video Multiplexing
Video Editors
XDSL Drivers
RF Receivers
Differential Line Drivers
_________________Pin Configurations
TOP VIEW
OUT 1
6 VCC
VEE 2
5 SHDN
IN+ 3
Pin Configurations
continued at end
of data sheet.
SOT23-6
4 IN-
MAX4223
MAX4224
____________________________Features
o Ultra-High Speed and Fast Settling Time:
1GHz -3dB Bandwidth (MAX4223, Gain = +1)
600MHz -3dB Bandwidth (MAX4224, Gain = +2)
1700V/µs Slew Rate (MAX4224)
5ns Settling Time to 0.1% (MAX4224)
o Excellent Video Specifications (MAX4223):
Gain Flatness of 0.1dB to 300MHz
0.01%/0.02° DG/DP Errors
o Low Distortion:
-60dBc THD (fc = 10MHz)
42dBm Third-Order Intercept (f = 30MHz)
o 6.0mA Quiescent Supply Current (per amplifier)
o Shutdown Mode:
350µA Supply Current (per amplifier)
100kΩ Output Impedance
o High Output Drive Capability:
80mA Output Current
Drives up to 4 Back-Terminated 75Ω Loads to
±2.5V while Maintaining Excellent Differential
Gain/Phase Characteristics
o Available in Tiny 6-Pin SOT23 and 10-Pin µMAX
Packages
______________Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
SOT
TOP MARK
MAX4223EUT-T -40°C to +85°C 6 SOT23
MAX4223ESA -40°C to +85°C 8 SO
AAAD
—
Ordering Information continued at end of data sheet.
_____________________Selector Guide
PART
MAX4223
MAX4224
MAX4225
MAX4226
MAX4227
MAX4228
MIN.
GAIN
1
2
1
1
2
2
AMPS
PER
PKG.
1
1
2
2
2
2
SHUT-
DOWN
MODE
Yes
Yes
No
Yes
No
Yes
PIN-
PACKAGE
6 SOT23, 8 SO
6 SOT23, 8 SO
8 SO
10 µMAX,
14 SO
8 SO
10 µMAX,
14 SO
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 408-737-7600 ext. 3468.
1 page  
1GHz, Low-Power, SOT23,
Current-Feedback Amplifiers with Shutdown
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
MAX4224
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)
4
VIN = 20mVp-p
3
2
1
0
-1
-2
-3
-4
-5
-6
1
SO-8 PACKAGE
RF = RG = 470Ω
SOT23-6 PACKAGE
RF = RG = 470Ω
10 100
FREQUENCY (MHz)
1000
MAX4224
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +5/+10)
4
3 VIN = 20mVp-p
2
AVCL = +5V/V
RF = 240Ω
1 RG = 62Ω
0
-1
-2 AVCL = +10V/V
-3
RF = 130Ω
RG = 15Ω
-4
-5
-6
1
10 100
FREQUENCY (MHz)
1000
MAX4224/MAX4227/MAX4228
LARGE-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)
4
3
AVCL = +2V/V
RF = RG = 470Ω
2 VOUT = 2Vp-p
1
0
-1
-2
-3
-4
-5
-6
1
10 100
FREQUENCY (MHz)
1000
MAX4225/MAX4226
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +1)
4
3
VIN = 20mVp-p
AVCL = +1V/V
2 RF = 560Ω
1
0
-1
-2
-3
-4
-5
-6
1
10 100
FREQUENCY (MHz)
1000
MAX4227/MAX4228
GAIN MATCHING vs. FREQUENCY
(AVCL = +2)
0.4
0.3
VIN = 20mVp-p
AVCL = +2V/V
0.2 RF = RG = 470Ω
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
0.1
1 10
FREQUENCY (MHz)
100
MAX4225/MAX4226
GAIN MATCHING vs. FREQUENCY
(AVCL = +1)
0.4
0.3 VIN = 2OmVp-p
AVCL = +1V/V
0.2 RF = 560Ω
AMPLIFIER A
0.1
0
-0.1
-0.2
AMPLIFIER B
-0.3
-0.4
-0.5
-0.6
1
10 100
FREQUENCY (MHz)
MAX4225/MAX4226
CROSSTALK vs. FREQUENCY
0
-10
RS = 50Ω
VOUT = 2Vp-p
-20
-30
-40
-50
-60
-70
-80
-90
-100
1
10 100
FREQUENCY (MHz)
1000
MAX4227/MAX4228
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)
4
3
VIN = 20mVp-p
AVCL = +2V/V
2 RF = RG = 470Ω
1
0
-1
-2
-3
-4
-5
-6
1
10 100
FREQUENCY (MHz)
1000
MAX4227/MAX4228
CROSSTALK vs. FREQUENCY
0
-10
RS = 50Ω
VOUT = 2Vp-p
-20
-30
-40
-50
-60
-70
-80
-90
-100
1
10 100
FREQUENCY (MHz)
1000
_______________________________________________________________________________________ 5
5 Page 
1GHz, Low-Power, SOT23,
Current-Feedback Amplifiers with Shutdown
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. The ground plane should be as free of voids
as possible, with one exception: the inverting input pin
(IN-) should have as low a capacitance to ground as
possible. This means that there should be no ground
plane under IN- 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.
Whether or not a constant-impedance board is used, it
is best to observe the following guidelines when
designing the board:
1) Do not use wire-wrapped boards (they are too
inductive) or breadboards (they are too capacitive).
2) Do not use IC sockets. IC sockets increase reac-
tance.
3) Keep signal lines as short and 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) In general, surface-mount components have shorter
bodies and lower parasitic reactance, giving better
high-frequency performance than through-hole com-
ponents.
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’ point 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 VCC and VEE pins. To minimize para-
sitic inductance, keep PC traces short and use surface-
mount components. The N.C. pins should be
connected to a common ground plane on the PC board
to minimize parasitic coupling.
If input termination resistors and output back-termina-
tion resistors are used, they should be surface-mount
types, and should be placed as close to the IC pins as
possible. Tie all N.C. pins to the ground plane to mini-
mize parasitic coupling.
Choosing Feedback and Gain Resistors
As with all current-feedback amplifiers, the frequency
response of these devices depends critically on the
value of the feedback resistor RF. RF combines with an
internal compensation capacitor to form 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.
Table 1 shows optimal values for the feedback resistor
(RF) and gain-setting resistor (RG) for the MAX4223–
MAX4228. Note that the MAX4224/MAX4227/MAX4228
offer superior AC performance for all gains except unity
gain (0dB). These values provide optimal AC response
using surface-mount resistors and good layout tech-
niques. Maxim’s high-speed amplifier evaluation kits
provide practical examples of such layout techniques.
Stray capacitance at IN- causes feedback resistor
decoupling and produces peaking in the frequency-
response curve. Keep the capacitance at IN- as low as
possible by using surface-mount resistors and by
avoiding the use of a ground plane beneath or beside
these resistors and the IN- pin. Some capacitance is
unavoidable; if necessary, its effects can be counter-
acted by adjusting RF. Use 1% resistors to maintain
consistency over a wide range of production lots.
Table 1. Optimal Feedback Resistor
Networks
GAIN
(V/V)
GAIN
(dB)
RF
(Ω)
RG
(Ω)
MAX4223/MAX4225/MAX4226
1 0 560* Open
2 6 200 200
5 14 100 25
MAX4224/MAX4227/MAX4228
2 6 470 470
5 14 240 62
10 20 130 15
-3dB
BW
(MHz)
1000
380
235
600
400
195
*For the MAX4223EUT, this optimal value is 470Ω.
0.1dB
BW
(MHz)
300
115
65
200
90
35
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX4223EUT-T.PDF ] | |
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