MAXIM MAX2750, MAX2751, MAX2752 Technical data
General Description
The MAX2750/MAX2751/MAX2752 are self-contained voltage-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 integrated on-chip, greatly simplifying application of the part.
The only required external components are a couple of
supply bypass capacitors. The IC provides direct connection 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 adjusted 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 external LDO regulator for the VCO. The IC also provides a digitally 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
♦ 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)
♦ 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
MAX2750/MAX2751/MAX2752
2.4GHz Monolithic
Voltage-Controlled Oscillators
________________________________________________________________ Maxim Integrated Products 1
Typical Operating Circuit
19-1825; Rev 0; 10/00
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information
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.
Pin Configuration appears at end of data sheet.
PART TEMP. RANGE PIN-PACKAGE
MAX2750EUA -40°C to +85°C 8 µMAX
MAX2751EUA -40°C to +85°C 8 µMAX
MAX2752EUA -40°C to +85°C 8 µMAX
BYP
TUNE
SHDN
TUNE
GND
SHDN
MAX2750
MAX2751
MAX2752
OSCILLATOR
CORE
BIAS
GND
OUT
V
V
CC1
CC2
OUT TO MIXER/
SYNTHESIZER
V
CC
ABSOLUTE MAXIMUM RATINGS
MAX2750/MAX2751/MAX2752
2.4GHz Monolithic
Voltage-Controlled Oscillators
2 _______________________________________________________________________________________
DC ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +5.5V, V
TUNE
= +0.4V to +2.4V, V
SHDN
≤ +2V, OUT = connected to 50Ω load, TA= -40°C to +85°C. Typical values
are at V
CC
= +3.0V, TA= +25°C, unless otherwise noted.) (Note 1)
AC ELECTRICAL CHARACTERISTICS
(MAX2750/MAX2751/MAX2752 EV kit, VCC= +2.7V to +5.5V, V
TUNE
= +0.4V to +2.4V, V
SHDN
≤ +2V, OUT = connected to 50Ω load,
T
A
= +25°C. Typical values are at VCC= +3.0V, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND..............................................................-0.3V to +6V
TUNE, SHDN, BYP, OUT to GND ...............-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 5.7mW/°C above T
A
= +70°C).....457mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage 2.7 5.5 V
Supply Current
Shutdown Supply Current 0.2 1 µA
SHDN Input Voltage Low
SHDN Input Voltage High
SHDN Input Current Low
SHDN Input Current High
TUNE Input Current 0.4 ≤ V
MAX2750
MAX2751
MAX2752
V
V
TA = +25oC
T
= -40oC to +85oC
A
TA = +25oC
T
= -40oC to +85oC
A
TA = +25oC
T
= -40oC to +85oC
A
11.3 14.4
14.1 17.0
9.7 12.1
12.7 15.9
10 12.1
12.8 15.2
2.0 V
≤ 0.6V -2 2 µA
SHDN
SHDN
≥ 2.0V
≤ 2.4V 0.02 nA
TUNE
-2 2 µA
0.6 V
mA
Oscillator Guaranteed
Frequency Limits (Note1)
Phase Noise
PARAMETER CONDITIONS MIN TYP MAX UNITS
= +0.4V to +2.4V,
V
TUNE
T
= -40oC to +85oC
A
f
= 4MHz
OFFSET
Noise floor -151 dBm/Hz
MAX2750
Tuning Gain (Note 2)
MAX2751
MAX2752
Output Power -3 dBm
Return Loss 12 dB
Harmonics -30 dBc
MAX2750 2400 2500 MHz
MAX2751 2120 2260 MHz
MAX2752 2025 2165 MHz
-125 dBc/Hz
f
= 2400MHz, +3V
OSC
f
= 2500MHz, +3V
OSC
f
= 2120MHz, +3V
OSC
f
= 2260MHz, +3V
OSC
f
= 2025MHz, +3V
OSC
f
= 2165MHz, +3V
OSC
140
90
175
110
170
105
MHz/V
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