MAX2750 Datasheet, PDF (1/6 Pages) Maxim Integrated Products – 2.4GHz Monolithic Voltage-Controlled Oscillators

19-1825; Rev 0; 10/00
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2.4GHz Monolithic
Voltage-Controlled Oscillators
General Description
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.
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.
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.
________________________Applications
802.11b DSSS WLAN
802.11 FHSS WLAN
Home RF
2.4GHz Bluetooth ISM Proprietary Radio
Features
o 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)
o On-Chip Tank Circuit
o Internally Matched Output Buffer Amplifier
o Low-Current Shutdown Mode
o +2.7V to +5.5V Supply Voltage Range
o Miniature 8-Pin µMAX Package
PART
MAX2750EUA
MAX2751EUA
MAX2752EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
BYP
GND
TUNE
TUNE
OSCILLATOR
OUT
CORE
GND
V_CC1
MAX2750
MAX2751
SHDN ^MAX2752
V_CC2
SHDN
BIAS
OUT TO MIXER/
SYNTHESIZER
V_CC
________________________________________________________________ Maxim Integrated Products 1
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