MAXIM MAX2754 Technical data

General Description

The MAX2754 self-contained, linear modulation, volt­age-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-mod­ulation transmit architecture. This device features a lin­ear 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 modula­tion sensitivity over the tuning voltage input range.
Typical frequency deviation is -500kHz/V which is linear
to ±4% over the guaranteed frequency limits. The tun­ing input voltage range is +0.4V to +2.4V and the oscil­lator frequency is factory adjusted to provide
guaranteed limits. The oscillator signal is buffered by
an output amplifier stage (internally matched to 50Ω) 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 sophisti­cated 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 direct­modulation 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

MAX2754

1.2GHz VCO with Linear
Modulation Input

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

SHDN

GND2

OUT

V

CC

V

CC

MOD

GND1

TUNE

TUNE

VREG

330nF

OUT TO
MIXER/
SYNTHESIZER

330nF

MODULATION

VOLTAGE

SIGNAL

MAX2754

REG AND BIAS

OSCILLATOR

CORE

LINEAR

MODULATION

INTERFACE

SHDN

Typical Operating Circuit

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.

(3mm ✕5mm)

8-pin µMAX

EVALUATION KIT

AVAILABLE

µMAX is a registered trademark of Maxim Integrated Circuits, Inc.

PART TEMP RANGE PIN-PACKAGE

MAX2754EUA -40°C to +85°C 8 µMAX

TOP VIEW

1

VREG

2

TUNE

GND1

MAX2754

3

4

µMAX

8

V

CC

7

OUT

6

GND2

5

SHDNMOD

MAX2754

1.2GHz VCO with Linear
Modulation Input

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, V

TUNE

= +0.4V to +2.4V, V

SHDN

≥ +2.0V, V

MOD

= +1.4V, OUT is connected to a 50Ω load, TA= -40°C to

+85°C. Typical values are at V

CC

= +3.0V, TA= +25°C, unless otherwise noted.) (Note 1)

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 +6.0V

VREG to GND ........................................................-0.3V to +6.0V

TUNE, SHDN, MOD to GND.......................-0.3V to (V

CC

+ 0.3V)

OUT to GND ..........................................................-0.3V to +6.0V

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 +160°C

Lead Temperature (soldering, 10s) .................................+300°C

AC ELECTRICAL CHARACTERISTICS

(MAX2754 EV kit. VCC= +2.7V to +5.5V, V

TUNE

= +0.4V to +2.4V, V

SHDN

≥ +2.0V, V

MOD

= +1.4V, OUT is connected to a 50Ω load,

T

A

= +25°C. Typical values are at VCC= +3.0V, TA= +25°C, unless otherwise noted.) (Note 1)

CAUTION! ESD SENSITIVE DEVICE

Supply Voltage V

Supply Current I

Digital Input Voltage High V

Digital Input Voltage Low V

Digital Input Current High I

Digital Input Current Low I

Modulation Input Voltage Range V

TUNE Leakage Current (Note 2) V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CC

T

A

T

CC

IH

IL

IH

IL

MOD

A

V

SHDN

V

SHDN

V

SHDN

TUNE

= +25°C, V

= -40°C to +85°C, V

≤ 0.6V -2 0.2 2 µA

≥ 2.0V -2 2 µA
≤ 0.6V -1 1 µA

= +0.4V to +2.4V 0.01 nA

2.7 5.5 V

≥ 2.0V 13.7 19

SHDN

≥ 2.0V 20

SHDN

2.0 V

0.6 V

0.4 2.4 V

mA

Oscillator Guaranteed Frequency

Limits

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

f

MIN

f

MAX

Phase Noise

Tuning Gain

,

V

= +0.4V to +2.4V,

TUNE

T

= -40°C to +85°C

A

f

= 4MHz -137 dBc/Hz

OFFSET

Noise floor -151 dBm/Hz

V

at f

V

TUNE

TUNE

at f

MIN

MAX

1145 1250 MHz

124
81

MHz/V

Output Power -5 dBm
Modulation Peak Frequency

Deviation

Modulation Sensitivity Common-mode V

f

MIN

< f < f

(Note 2) ±400 ±500 ±600 kHz

MAX

= 1.4V -500 kHz/V

MOD

MAX2754

1.2GHz VCO with Linear
Modulation Input

_______________________________________________________________________________________ 3

Note 1: Specifications are production tested at TA= +25°C. Limits over temperature are guaranteed by design and characterization.
Note 2: Limits are guaranteed by production test at +25°C.
Note 3: Center point is nominally +1.4V.
Note 4: Maximum variation in the modulation sensitivity from its average value over the guaranteed frequency limits.
Note 5: Bandwidth is defined as the point where the response to the modulation port is 0.707 times the low-frequency response.

Bandwidth limits on the modulation input for a 1Vp-p sine wave. Common-mode V

MOD

= +1.4V.

Note 6: Refer to Output Buffer section for suggestions to improve the return loss to 12dB.
Note 7: Turn-on time to within 3dB of final output power.
Note 8: Turn-off time to output power of -10dBm.

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2754 EV kit. VCC= +2.7V to +5.5V, V

TUNE

= +0.4V to +2.4V, V

SHDN

≥ +2.0V, V

MOD

= +1.4V, OUT is connected to a 50Ω load,

T

A

= +25°C. Typical values are at VCC= +3.0V, TA= +25°C, unless otherwise noted.) (Note 1)

p-p

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Modulation Linearity

Modulation Full-Power Bandwidth

(Note 5)

Return Loss (Note 6) f

V

MOD

f

< f < f

MIN

= +0.4 to +2.4V,

(Note 4)

MAX

±4 %

2.5 MHz

MIN

< f < f

MAX

7.5 dB
Output Harmonics -20 dBc
Load Pulling VSWR = 2:1, all phases 1.5 MHz
Supply Pushing V

stepped: +3.3V to +2.8V 0.16 MHz/V

CC

Oscillator Turn-On Time (Note 7) 10 µs
Oscillator Turn-Off Time (Note 8) 8 µs