MAX2057 Maxim Integrated Products, MAX2057 Datasheet - Page 11
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MAX2057
Manufacturer Part Number
MAX2057
Description
1700MHz to 2500MHz Variable-Gain Amplifier
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX2057.pdf
(12 pages)
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Table 1. Typical Application Circuit
Component Values
A single input voltage at the V
of the MAX2057. Up to 21dB of gain-control range is
provided through a single attenuator. At the maximum
gain setting, each attenuator’s insertion loss is approxi-
mately 2.2dB. With the single attenuator at the maximum
gain setting, the device provides a nominal 15.5dB of
cascaded gain and 6dB of cascaded noise figure.
If a larger gain-control range is desired, a second on-
chip attenuator can be connected in the signal path to
provide an additional 21dB of gain-control range. With
the second attenuator connected at the maximum gain
setting, the device typically exhibits 13.3dB of cascad-
ed gain. Note that the V
both on-chip attenuators.
The V
(>250kΩ). It is suggested that a current-limiting resistor
be included in series with this connection to limit the
input current to less than 40mA should the control volt-
age be applied when V
tor of greater than 200Ω will provide complete
protection for 5V control voltage ranges. Limit V
input voltages to a 1.0V to 4.5V range when V
present to ensure the reliability of the device.
C1, C3, C5, C7, C10
C2, C4, C6, C8, C9
DESIGNATION
C13, C14, C15
CNTL
C17
R1
R2
input voltage drives a high-impedance load
Applications Information
______________________________________________________________________________________
Analog Attenuation Control
CC
VALUE
1000pF
0.75pF
CNTL
1.2kΩ
0.1µF
22pF
2kΩ
is not present. A series resis-
pin simultaneously adjusts
1700MHz to 2500MHz Variable-Gain
CNTL
Amplifier with Analog Gain Control
Microwave capacitors
(0402)
Microwave capacitors
(0402)
Microwave capacitors
(0603)
Microwave capacitor
(0402)
±1% resistor (0402)
±1% resistor (0402)
pin adjusts the gain
TYPE
CC
CNTL
is
The MAX2057 integrates a two-stage amplifier to simul-
taneously provide high gain and high IP3. Optimal per-
formance is obtained when R1 and R2 are equal to
1.2kΩ and 2kΩ, respectively. The typical supply current
is 180mA and the typical output IP3 is 37dBm under
these conditions.
Increasing R
and 2kΩ reduces the bias current of each amplifier
stage, which reduces the total power consumption and
IP3 of the device. This feature can be utilized to further
decrease power consumption for applications that do
not require high IP3.
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and induc-
tance. For best performance, route the ground-pin
traces directly to the exposed pad underneath the
package. This pad MUST be connected to the ground
plane of the board by using multiple vias under the
device to provide the best RF and thermal conduction
path. Solder the exposed pad on the bottom of the
device package to a PC board exposed pad.
Proper voltage-supply bypassing is essential for high-
frequency circuit stability. Bypass each V
capacitors placed as close to the device as possible.
Place the smallest capacitor closest to the device. Refer
to the MAX2057 evaluation kit data sheet for more details.
The EP of the MAX2057’s 36-pin thin QFN-EP package
provides a low-thermal-resistance path to the die. It is
important that the PC board on which the IC is mounted
be designed to conduct heat from this contact. In addi-
tion, the EP provides a low-inductance RF ground path
for the device.
The EP MUST be soldered to a ground plane on the PC
board either directly or through an array of plated via
holes. Soldering the pad to ground is also critical for
efficient heat transfer. Use a solid ground plane wher-
ever possible.
1
Exposed Paddle RF and Thermal
and R
2
from the nominal values of 1.2kΩ
Power-Supply Bypassing
Layout Considerations
Amplifier Bias Current
Considerations
CC
pin with
11