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MAX2754EUA Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX2754EUA
Description  1.2GHz VCO with Linear Modulation Input
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX2754EUA Datasheet(HTML) 6 Page - Maxim Integrated Products

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Applications Information
Tune Input
The tuning input is typically connected to the output of
the PLL loop filter. The loop filter provides an appropri-
ately low-impedance source. Incorporate an extra RC
filter stage to reduce high-frequency noise and spuri-
ous 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 intro-
duced on the tuning 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.
Two-Level FSK Applications
The MAX2754 is designed for use in FSK applications
operating in the 2.4GHz to 2.5GHz ISM band. Specifically,
it is targeted for those systems which utilize a direct TX
modulation architecture in which the VCO is directly modu-
lated with the data signal during the transmit (TX) mode.
The VCO in these systems runs at half the RF output
frequency and is used in conjunction with a frequency
doubler to produce the final LO signal for both RX and
TX modes of operation.
Figure 2 shows a typical applications circuit. To com-
pute R1, R2, R3, and R4, determine the modulation
voltage center point (VMODB = +1.4V). Compute the
required modulation voltage deviation as follows:
1.2GHz VCO with Linear
Modulation Input
6
_______________________________________________________________________________________
MODULATION VOLTAGE, VMOD (V)
1.0
fNOM
fNOM + fMOD
fNOM - fMOD
2.0
1.5
2.5
0.5
Figure 1. Modulation Frequency Deviations Characteristics
SHDN
FROM BASEBAND
DIGITAL
CONTROLLER
GND2
OUT
VCC
VCC
MOD
GND1
R1
R2
R4
R3
TUNE
FROM PLL
LOOP FILTER
VREG
330nF
OUT TO
MIXER/
SYNTHESIZER
330nF
INVERTED
CMOS
SIGNAL
MAX2754
REG AND BIAS
MOD.
FILTER
OSCILLATOR
CORE
LINEAR
MODULATION
INTERFACE
VCC
Figure 2. Typical Application Circuit for Two-Level FSK


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