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MAX2750AUA+ Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX2750AUA+
Description  2.4GHz Monolithic Voltage-Controlled Oscillator
Download  7 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX2750AUA+ Datasheet(HTML) 5 Page - Maxim Integrated Products

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Detailed Description
Oscillator
The MAX2750AUA VCO is implemented as an LC oscil-
lator topology, integrating all of the tank components on-
chip. This fully monolithic approach provides an extremely
easy-to-use VCO, equivalent to a VCO module. The fre-
quency is controlled by a voltage applied to the TUNE pin,
which is internally connected to the varactor. The VCO
core uses a differential topology to provide a stable fre-
quency versus supply voltage and improve the immunity
to load variations. In addition, there is a buffer amplifier
following the oscillator core to provide added isolation
from load variations and to boost the output power.
Output Buffer
The oscillator signal from the core drives an output buf-
fer amplifier. The amplifier is internally matched to 50Ω
including an on-chip DC-blocking capacitor. No external
DC-blocking capacitor is required, eliminating the need
for any external components. The output amplifier has its
own VCC and GND pins to minimize load-pulling effects.
The amplifier boosts the oscillator signal to a level suit-
able for driving most RF mixers.
Applications Information
Tune Input
The tuning input is typically connected to the output of the
PLL loop filter. The loop filter provides an appropriately
low-impedance source. The input may incorporate an
extra RC filter stage to reduce high-frequency noise and
spurious signals. Any excess noise on the tuning input is
directly translated into FM noise, which can degrade the
phase-noise performance of the oscillator. Therefore, it
is important to minimize the noise introduced on the tun-
ing input. A simple RC filter with low corner frequency is
needed during testing to filter the noise present on the
voltage source driving the tuning line.
Layout Issues
Always use controlled impedance lines (microstrip, copla-
nar waveguide, etc.) for high-frequency signals. Always
place decoupling capacitors as close as possible to the
VCC pins; for long VCC lines, it may be necessary to add
additional decoupling capacitors located further from the
device. Always provide a low-inductance path to ground,
and keep GND vias as close as possible to the device.
Thermal reliefs on GND pads are not recommended.
VCC2
VCC1
SHDN
1
2
8
7
GND
OUT
TUNE
GND
BYP
µMAX
+
TOP VIEW
3
4
6
5
MAX2750AUA
MAX2750AUA
2.4GHz Monolithic
Voltage-Controlled Oscillator
www.maximintegrated.com
Maxim Integrated │ 5
Pin Configuration


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