19-2102; Rev 1; 8/03
KIT
ATION
EVALU
BLE
AVAILA
1.2GHz VCO with Linear
Modulation Input
Features
o
Fully Monolithic VCO Construction with On-Chip
Inductor and Varactor Tuning Elements
o
Guaranteed 1145MHz to 1250MHz Tuning Range
to Support 1/2 LO Applications
o
Modulation Linearity Within 鹵4%
o
Precise Modulation Gain (-500kHz/V)
o
Low Phase Noise (-137dBc/Hz at 4MHz offset)
o
+2.7V to +5.5V Single-Supply Operation
o
Low-Current Shutdown Mode
o
Miniature 8-Pin 碌MAX Package
General Description
The MAX2754 self-contained, linear modulation, volt-
age-controlled oscillator (VCO) is intended for use in
the 2.4GHz to 2.5GHz ISM band, particularly for FSK
modulation systems that utilize a direct frequency-mod-
ulation transmit architecture. This device features a lin-
ear modulation input in addition to the standard
frequency tuning input. The frequency tuning range of
1145MHz to 1250MHz (1/2 LO) also supports an IF up
to 110MHz with low side LO. The VCO is based on
Maxim鈥檚 proprietary monolithic VCO technology, where
all VCO components are integrated on-chip, including
the varactor and inductor.
The MAX2754 linear modulation input offers a means to
directly FM modulate the VCO with a constant modula-
tion sensitivity over the tuning voltage input range.
Typical frequency deviation is -500kHz/V which is linear
to 鹵4% over the guaranteed frequency limits. The tun-
ing input voltage range is +0.4V to +2.4V and the oscil-
lator frequency is factory adjusted to provide
guaranteed limits. The oscillator signal is buffered by
an output amplifier stage (internally matched to 50鈩? to
provide higher output power and isolate the oscillator
from load impedance variations.
The MAX2754 operates over a +2.7V to +5.5V supply
range. This device also provides a digitally controlled
shutdown mode to permit implementation of sophisti-
cated power-supply management. In shutdown, the
supply current is reduced to 0.2碌A(chǔ). Even when active,
power consumption is a modest 41mW.
The MAX2754 is packaged in the miniature 8-pin 碌MAX
to offer the world鈥檚 smallest, complete 2.4GHz direct-
modulation VCO solution.
MAX2754
Ordering Information
PART
MAX2754EUA
TEMP RANGE
-40擄C to +85擄C
PIN-PACKAGE
8 碌MAX
8-pin 碌MAX
(3mm
鉁?/div>
5mm)
Applications
HomeRF WLAN
Bluetooth
2.4GHz Cordless Phones
2.4GHz Wireless Data Radios
VREG
330nF
Typical Operating Circuit
V
CC
REG AND BIAS
V
CC
330nF
Pin Configuration
TOP VIEW
TUNE
TUNE
OSCILLATOR
CORE
OUT
OUT TO
MIXER/
SYNTHESIZER
GND1
GND2
LINEAR
MODULATION
INTERFACE
VREG
TUNE
GND1
MOD
1
2
3
4
8
V
CC
OUT
GND2
SHDN
MODULATION
VOLTAGE
SIGNAL
MOD
SHDN
SHDN
MAX2754
7
6
5
碌MAX
MAX2754
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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