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MAX4104EUK-T Datasheet(PDF) 9 Page - Maxim Integrated Products

Part # MAX4104EUK-T
Description  740MHz, Low-Noise, Low-Distortion Op Amps in SOT23-5
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX4104EUK-T Datasheet(HTML) 9 Page - Maxim Integrated Products

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_______________Detailed Description
The MAX4104/MAX4105/MAX4304/MAX4305 are ultra-
high-speed, low-noise amplifiers featuring -3dB band-
widths up to 880MHz, 0.1dB gain flatness up to
100MHz, and low differential gain and phase errors of
0.01% and 0.01°, respectively. These devices operate
on dual power supplies ranging from ±3.5V to ±5.5V
and require only 20mA of supply current.
The MAX4104/MAX4304/MAX4105/MAX4305 are opti-
mized for minimum closed-loop gains of +1V/V, +2V/V,
+5V/V and +10V/V (respectively) with corresponding
-3dB bandwidths of 880MHz, 730MHz, 430MHz, and
350MHz. Each device in this family features a low input
voltage noise density of only 2.1nV/
√Hz (at 1MHz), an
output current drive of ±70mA, and spurious-free
dynamic range as low as -88dBc (5MHz, RL = 100Ω).
___________Applications Information
Layout and Power-Supply Bypassing
The MAX4104/MAX4105/MAX4304/MAX4305 have an
extremely high bandwidth, and consequently require
careful board layout, including the possible use of
constant-impedance microstrip or stripline techniques.
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 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-wrapped 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 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) Bear in mind that, in general, surface-mount compo-
nents have shorter bodies and lower parasitic reac-
tance, resulting in greatly improved high-frequency
performance over through-hole components.
The bypass capacitors should include 1nF and 0.1µF
ceramic surface-mount capacitors between each sup-
ply 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 mini-
mize parasitic inductance, keep PC traces short and
use surface-mount components.
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.
DC and Noise Errors
The MAX4104/MAX4105/MAX4304/MAX4305 output
offset voltage, VOUT (Figure 1), can be calculated with
the following equation:
VOUT = [VOS + (IB+ x RS) + (IB- x (RF
|| RG))] [1 + RF / RG]
where:
VOS = input offset voltage (in volts)
1 + RF/RG = amplifier closed-loop gain (dimensionless)
IB+ = noninverting input bias current (in amps)
IB- = inverting input bias current (in amps)
RG = gain-setting resistor (in ohms)
RF = feedback resistor (in ohms)
RS = source resistor at noninverting input (in ohms)
The following equation represents output noise density:
e
1
R
R
i x R
i x R
R
e
n(OUT)
F
G
n
S
2
n
F
G
2
n
2
||
=
+
(
) + (
)


+
740MHz, Low-Noise, Low-Distortion
Op Amps in SOT23-5
_______________________________________________________________________________________
9
_____________________Pin Description
SOT23-5
SO
OUT
VCC
VEE
IN+
IN-
N.C.
NAME
Amplifier Output
6
1
Positive Power Supply
7
5
Negative Power Supply
4
2
Amplifier Noninverting
Input
3
3
Amplifier Inverting Input
2
4
Not internally connected.
1, 5, 8
FUNCTION
PIN


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