MAX2056ETX-T Maxim Integrated Products, MAX2056ETX-T Datasheet - Page 11

• Manufacturer Part Number: MAX2056ETX-T
• Description: RF Mixer 800MHz to 1000MHz Va riable-Gain Amplifie
• Manufacturer: Maxim Integrated Products

Specifications of MAX2056ETX-T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 1. Typical Application Circuit
Components Values
A single input voltage at the V
of the MAX2056. Up to 22dB of gain-control range is
provided through a single attenuator. At the maximum
gain setting, each attenuator’s insertion loss is approxi-
mately 1.7dB. With the single attenuator at the maxi-
mum gain setting, the device provides a nominal
15.5dB of cascaded gain and 4.5dB 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 22dB of gain-control range. With
the second attenuator connected at the maximum gain
setting, the device typically exhibits 13.8dB of cascad-
ed gain. Note that the V
both on-chip attenuators. The V
ves a high-impedance load (>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 voltage be applied when V
is not present. A series resistor of greater than 200Ω
will provide complete protection for 5V control voltage
ranges. Limit V
range when V
of the device.
The MAX2056 integrates a two-stage amplifier to simul-
taneously provide high gain and high IP3. Optimal per-
C2, C4, C6, C8, C9
C1, C3, C5, C10
DESIGNATION
C13, C14, C15
C7
R1
R2
CC
Applications Information
CNTL
______________________________________________________________________________________
is present to ensure the reliability
VALUE
1000pF Microwave capacitors (0402)
3.92kΩ
Analog Attenuation Control
1.2kΩ
3.9pF
0.1µF
47pF
input voltages to a 1.0V to 4.5V
CNTL
Amplifier Bias Current
Microwave capacitors (0402)
Microwave capacitor (0402)
Microwave capacitors (0603)
±1% resistor (0402)
±1% resistor (0402)
pin simultaneously adjusts
CNTL
Amplifier with Analog Gain Control
CNTL
800MHz to 1000MHz Variable-Gain
pin adjusts the gain
input voltage dri-
TYPE
CC
formance is obtained when R1 and R2 are equal to
1.2kΩ and 3.92kΩ, respectively. The typical supply cur-
rent is 136mA and the typical output IP3 is 39dBm
under these conditions.
Increasing R1 and R2 from the nominal values of 1.2kΩ
and 3.92kΩ 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 MAX2056 evaluation kit data sheet for more details.
The EP of the MAX2056’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.
Exposed Paddle RF and Thermal
Power-Supply Bypassing
Layout Considerations
Considerations
CC
pin with
11