|
MAX2754 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 1.2GHz VCO with Linear Modulation Input | |||
|
19-2102; Rev 2; 5/06
EVAALVUAAILTAIOBNLEKIT
1.2GHz VCO with Linear
Modulation Input
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
Maximâs 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 ±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 50â¦) 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 0.2µA. Even when active,
power consumption is a modest 41mW.
The MAX2754 is packaged in the miniature 8-pin µMAX
to offer the worldâs smallest, complete 2.4GHz direct-
modulation VCO solution.
Applications
HomeRF WLAN
Bluetooth
2.4GHz Cordless Phones
2.4GHz Wireless Data Radios
Features
⦠Fully Monolithic VCO Construction with On-Chip
Inductor and Varactor Tuning Elements
⦠Guaranteed 1145MHz to 1250MHz Tuning Range
to Support 1/2 LO Applications
⦠Modulation Linearity Within ±4%
⦠Precise Modulation Gain (-500kHz/V)
⦠Low Phase Noise (-137dBc/Hz at 4MHz offset)
⦠+2.7V to +5.5V Single-Supply Operation
⦠Low-Current Shutdown Mode
⦠Miniature 8-Pin µMAX® Package
PART
MAX2754EUA
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8-pin µMAX
(3mm â 5mm)
µMAX is a registered trademark of Maxim Integrated Circuits, Inc.
Typical Operating Circuit
330nF
VREG
REG AND BIAS
VCC
VCC
330nF
TOP VIEW
Pin Configuration
VREG 1
TUNE 2
GND1 3
MOD 4
MAX2754
µMAX
8 VCC
7 OUT
6 GND2
5 SHDN
TUNE
TUNE
OSCILLATOR
CORE
GND1
MODULATION
VOLTAGE
SIGNAL
MOD
MAX2754
LINEAR
MODULATION
INTERFACE
OUT
OUT TO
MIXER/
SYNTHESIZER
GND2
SHDN SHDN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maximâs website at www.maxim-ic.com.
|
▷ |