MAX2754EUA Maxim Integrated Products, MAX2754EUA Datasheet

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MAX2754EUA

Manufacturer Part Number
MAX2754EUA
Description
Timers & Support Products 1.2GHz Monolithic VC O with Linear Modula
Manufacturer
Maxim Integrated Products
Datasheet

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Part Number:
MAX2754EUA
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MAXIM
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10 000
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’s 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 50 ) 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 world’s smallest, complete 2.4GHz direct-
modulation VCO solution.
19-2102; Rev 2; 5/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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GND1
VREG
TUNE
MOD
________________________________________________________________ Maxim Integrated Products
1
2
3
4
General Description
MAX2754
MAX
Pin Configuration
7
5
8
6
Applications
V
OUT
GND2
SHDN
CC
1.2GHz VCO with Linear
♦ Fully Monolithic VCO Construction with On-Chip
♦ Guaranteed 1145MHz to 1250MHz Tuning Range
♦ 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
µMAX is a registered trademark of Maxim Integrated Circuits, Inc.
MODULATION
MAX2754EUA
Inductor and Varactor Tuning Elements
to Support 1/2 LO Applications
330nF
VOLTAGE
SIGNAL
TUNE
PART
VREG
TUNE
GND1
MOD
MAX2754
Modulation Input
Typical Operating Circuit
(3mm
-40°C to +85°C
TEMP RANGE
Ordering Information
8-pin µMAX
REG AND BIAS
MODULATION
OSCILLATOR
®
INTERFACE
LINEAR
CORE
Package
5mm)
PIN-PACKAGE
8 µMAX
GND2
SHDN
Features
OUT
V
CC
V
CC
OUT TO
MIXER/
SYNTHESIZER
SHDN
330nF
1

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MAX2754EUA Summary of contents

Page 1

... 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 MAX2754EUA µMAX is a registered trademark of Maxim Integrated Circuits, Inc. Applications 330nF TUNE 8 ...

Page 2

VCO with Linear Modulation Input ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.0V CC VREG to GND ........................................................-0.3V to +6.0V TUNE, SHDN, MOD to GND.......................-0. OUT to GND ..........................................................-0.3V to +6.0V Continuous Power Dissipation (T = ...

Page 3

AC ELECTRICAL CHARACTERISTICS (continued) (MAX2754 EV kit +2.7V to +5.5V +25°C. Typical values are PARAMETER SYMBOL Modulation Linearity Modulation Full-Power Bandwidth (Note 5) Return Loss (Note 6) Output Harmonics Load ...

Page 4

VCO with Linear Modulation Input (MAX2754 EV kit +3.0V, V SHDN CC VCO TUNING CURVE 1350 1300 T = -40 C 1250 A 1200 1150 1100 1050 ...

Page 5

PIN NAME 1 VREG Capacitor Connection to the On-Chip Linear Regulator Output. Connect a 330nF capacitor to ground. Oscillator Frequency Tuning-Voltage Input. High-impedance input with a voltage range of +0.4V (low 2 TUNE frequency) to +2.4V (high frequency). Ground Connection ...

Page 6

VCO with Linear Modulation Input Applications Information The tuning input is typically connected to the output of the PLL loop filter. The loop filter provides an appropri- ately low-impedance source. Incorporate an extra RC filter stage to reduce high-frequency ...

Page 7

500kHz/V (nominal modulation sensitivity) Let Setting R based on the desired current from V and filter impedance level ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products ...

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