Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2754EUA+

General Description

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 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 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.

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

OUT

GND2

SHDNMOD

GND1

TUNE

VREG

MAX2754

µMAX

TOP VIEW

Pin Configuration

Ordering Information

SHDN

GND2

OUT

MOD

GND1

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.

PART TEMP RANGE PIN-PACKAGE

MAX2754EUA -40°C to +85°C 8 µMAX

(3mm

5mm)

8-pin µMAX

EVALUATION KIT

AVAILABLE

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

Summary of content (8 pages)

PAGE 1
9-2102; Rev 2; 5/06 KIT ATION EVALU E L B AVAILA 1.2GHz VCO with Linear Modulation Input 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.
PAGE 2
MAX2754 1.2GHz VCO with Linear Modulation Input ABSOLUTE MAXIMUM RATINGS 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 VCC to GND ...........................................................-0.3V to +6.0V VREG to GND ...........................................
PAGE 3
1.2GHz VCO with Linear Modulation Input (MAX2754 EV kit. VCC = +2.7V to +5.5V, VTUNE = +0.4V to +2.4V, V SHDN ≥ +2.0V, VMOD = +1.4V, OUT is connected to a 50Ω load, TA = +25°C. Typical values are at VCC = +3.0V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER Modulation Linearity SYMBOL CONDITIONS VMOD = +0.4 to +2.4V, fMIN < f < fMAX (Note 4) Modulation Full-Power Bandwidth (Note 5) Return Loss (Note 6) fMIN < f < fMAX Output Harmonics MIN TYP MAX UNITS ±4 % 2.5 MHz 7.
PAGE 4
Typical Operating Characteristics (MAX2754 EV kit, VCC = +3.0V, V SHDN ≥ +2.0V, VTUNE = VMOD = +1.4V, and TA = +25°C, unless otherwise noted.) VCO TUNING CURVE 1050 TA = +85°C 1000 -480 -500 -520 -540 -560 950 0 0.5 1.0 1.5 2.0 2.5 3.0 1140 1160 1180 MAX2754 toc04 OUTPUT POWER (dBm) OUTPUT POWER (dBm) -4.0 -4.5 VCC = +4.0V -5.0 VCC = +2.7V -5.5 1200 1220 1240 0.4 0.2 1260 -40 -15 10 35 60 TEMPERATURE (°C) OUTPUT POWER vs.
PAGE 5
1.2GHz VCO with Linear Modulation Input PIN NAME FUNCTION 1 VREG Capacitor Connection to the On-Chip Linear Regulator Output. Connect a 330nF capacitor to ground. 2 TUNE Oscillator Frequency Tuning-Voltage Input. High-impedance input with a voltage range of +0.4V (low frequency) to +2.4V (high frequency). 3 GND1 Ground Connection for the Oscillator Core. Requires a low-inductance connection to the circuitboard ground plane. 4 MOD Linear Modulation Input.
PAGE 6
Applications Information Tune Input The tuning input is typically connected to the output of the PLL loop filter. The loop filter provides an appropriately low-impedance source. Incorporate an extra RC filter stage to reduce high-frequency noise and spurious signals. Any excess noise on the tuning input is directly translated into FM noise, which can degrade the phase-noise performance of the oscillator. Therefore, it is important to minimize the noise introduced on the tuning input.
PAGE 7
1.2GHz VCO with Linear Modulation Input Let R = R1 + R3 + R4. Setting R based on the desired current from VCC and filter impedance level: R1 = R , 2 ⎛V ⎞ R R2 = ⎜ MODB − 1⎟ × , 4 ⎝ ∆V ⎠ ⎛1 ⎞ V R 3 = R × ⎜ − MODB ⎟ , VCC ⎠ ⎝2 R4 = VMODB VCC Layout Issues Use controlled impedance lines (microstrip, co-planar waveguide, etc.) each time for high-frequency signals.
PAGE 8
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 4X S 8 8 INCHES DIM A A1 A2 b E Ø0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6° 0° 0.0207 BSC 8LUMAXD.EPS MAX2754 1.