19-1825; Rev 0; 10/00
2.4GHz Monolithic
Voltage-Controlled Oscillators
General Description
Features
The MAX2750/MAX2751/MAX2752 are self-contained volt-
age-controlled oscillators (VCOs) intended for use in the
2.4GHz to 2.5GHz ISM band. Each IC combines a fully
integrated oscillator and output buffer in a miniature 8-pin
µMAX package.
ꢀ Guaranteed Frequency Tuning Range
MAX2750: 2400MHz to 2500MHz (Zero IF)
MAX2751: 2120MHz to 2260MHz
(240MHz to 280MHz IF)
MAX2752: 2025MHz to 2165MHz
(335MHz to 375MHz IF)
The inductor and varactor elements of the tank are inte-
grated on-chip, greatly simplifying application of the part.
The only required external components are a couple of
supply bypass capacitors. The IC provides direct connec-
tion to the VCO tuning voltage input and the VCO buffer
output. The tuning voltage input range is +0.4V to +2.4V,
and the oscillator frequency tuning range is factory adjust-
ed to provide guaranteed limits. The output signal is
buffered by an amplifier stage (internally matched to 50Ω)
to provide higher output power and isolate the device from
load impedance variations.
ꢀ On-Chip Tank Circuit
ꢀ Internally Matched Output Buffer Amplifier
ꢀ Low-Current Shutdown Mode
ꢀ +2.7V to +5.5V Supply Voltage Range
ꢀ Miniature 8-Pin µMAX Package
Ordering Information
The MAX2750/MAX2751/MAX2752 operate over a +2.7V
to +5.5V supply voltage range. Internal regulation of the
oscillator supply voltage eliminates the need for an exter-
nal LDO regulator for the VCO. The IC also provides a dig-
itally controlled shutdown mode to permit implementation
of sophisticated power-supply management. In shutdown,
the supply current is reduced to less than 1µA.
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
MAX2750EUA
MAX2751EUA
MAX2752EUA
8 µMAX
8 µMAX
Pin Configuration appears at end of data sheet.
________________________Applications
802.11b DSSS WLAN
802.11 FHSS WLAN
Home RF
2.4GHz Bluetooth ISM Proprietary Radio
Typical Operating Circuit
BYP
GND
OUT
TUNE
GND
OSCILLATOR
CORE
OUT TO MIXER/
SYNTHESIZER
TUNE
V
CC1
CC2
MAX2750
MAX2751
MAX2752
V
CC
V
SHDN
SHDN
BIAS
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.