MAXIM MAX2338 User Manual

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General Description

The MAX2338 receiver RF front-end IC is designed for dual-band CDMA cellular phones and can also be used in dual-band TDMA, GSM, or EDGE cellular phones. Thanks to the MAX2338’s on-chip low-power LO divider, the cellular VCO module can be eliminated.

The MAX2338 includes a low-noise amplifier (LNA) with an adjustable high-input third-order intercept point (IIP3) to minimize intermodulation and cross-modulation in the presence of large interfering signals. For cellular band operation, a low-gain LNA is available for higher cascaded IIP3 at lower current.

The CDMA mixers are designed for high linearity, low noise, and differential IF outputs. The FM mixer is designed for lower current and single-ended output.

The MAX2338 triple-mode LNA/mixer includes an onchip LO frequency divider to allow the use of a single VCO for both bands. This device is available in an ultrasmall 28-pin leadless QFN package.

________________________Applications

Dual-Band, Triple-Mode PCS/Cellular Phones

Dual-Mode Cellular Phones

Features

♦ 1.4dB LNA Noise Figure

♦ 15dB LNA Gain

♦ Mixer Noise Figure

7.5dB (CDMA)

8.7dB (AMPS)

♦ Mixer Gain

14.5dB PCS

13.3dB Cellular

8.8dB AMPS

♦ LO Frequency Divider, Saves VCO Module

♦ LO Output Buffers for TX

♦ Ultra-Small 28-Pin Leadless Package

MAX2338

Triple/Dual-Mode CDMA LNA/Mixers

________________________________________________________________ Maxim Integrated Products 1

MAX2338

2526

28 22

2324

10 11 12 13 14

N.C.

GND

LO/2

LOIN

GND

PLOOUT

CLOOUT

CMIXIN

CLNAOUT

GND

PLNAOUT

GND

PMIXIN

GND

CLNAIN

LIN

GAIN

PLNAIN

RLNA

IF-

GND

BUFFEN

FMOUT

IF+

RBIAS

QFN

TOP VIEW

÷2

BAND

19-1807; Rev 1; 3/01

EVALUATION KIT

AVAILABLE

Ordering Information

28 QFN

PIN-PACKAGETEMP RANGE

-40°C to +85°CMAX2338EGI

PART

Pin Configuration/

Functional Diagram

Typical Operating Circuit appears at end of data sheet.

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.

MAX2338

Triple/Dual-Mode CDMA LNA/Mixers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +3.3V, R

RBIAS

= R

RLNA

= 24kΩ, BUFFEN = LOW, all RF and IF outputs connected to VCC, no RF applied, TA= -40°C

to +85°C. Typical values are at +3.0V and T

= +25°C, unless otherwise noted. Refer to Operational Modes table for control logic.)

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 +4.3V

Digital Input Voltage to GND......................-0.3V to (V

+ 0.3V)

LNA Input Level...............................................................1V peak

LO, Mixer Input Levels .....................................................+5dBm

Digital Input Current .........................................................±10mA

Continuous Power Dissipation (T

= +70°C)

28-Pin QFN (derate 28.5mW/°C above T

= +70°C).........2W

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

UNITS

PCS CDMA MODES

High-gain, low-linearity mode 18 24

Operating Supply Current

High-gain, high-linearity mode 25 33

CELLULAR CDMA MODE

Low-gain mode

High-gain, low-linearity mode 18 24

Operating Supply Current

High-gain, high-linearity mode 28 35

FM MODE

Operating Supply Current

17 mA

SHUTDOWN MODE

Shutdown Supply Current 0.1 5 µA

ALL MODES

LO/2 = LOW 7.2 9.5

LO Buffer Supply Current BUFFEN = HIGH

LO/2 = HIGH

Additional Operational Current Divider Active

Cellular and FM mode; LO/2 = HIGH 1.2 mA

Digital Input Logic High 2.0 V

Digital Input Logic Low 0.6 V

Digital Input High Current 5 µA

Digital Input Low Current -25 µA

MIN TYP MAX

19.5

13.5

10.3

MAX2338

Triple/Dual-Mode CDMA LNA/Mixers

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2338 EV kit, VCC= +2.7V to +3.3V, f

PLNAIN

= f

PMIXIN

= 1930MHz to 1990MHz, f

CLNAIN

= f

CMIXIN

= 869MHz to 894MHz, fIF=

183MHz, high side LO, LO/2 = LOW. All ports matched to 50Ω, R

RLNA

= R

RBIAS

= 24kΩ, TA= -40°C to +85°C. Typical values are at

= +25°C, VCC= +3.0V, unless otherwise noted.)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

OVERALL PERFORMANCE

Low-Band RF Frequency Range

894

MHz

High-Band RF Frequency Range

MHz

Low-Band LO Frequency Range After divider if active (Note 1)

MHz

High-Band LO Frequency Range (Note 1)

MHz

IF Frequency Range (Note 1) 80 220

MHz

LO Input Level -7 -3 0

dBm

CELLULAR LNA PERFORMANCE

HIGH-GAIN, HIGH-LINEARITY MODES

Gain (Note 2)

Noise Figure (Note 3) TA = +25°C 1.4 1.6 dB

Noise Figure Change Due to Temperature

= +25°C to T

MAX

0.3 dB

IIP3 (Notes 3, 4) 9.5 12

dBm

CDMA HIGH-GAIN, LOW-LINEARITY MODE AND FM MODE

Gain (Note 2) 13

Noise Figure (Note 3) TA = +25°C 1.4 1.7 dB

IIP3 (Note 3, 4) 2.5 5.5

dBm

CDMA LOW-GAIN MODE

Gain (Note 2)

dBm

Noise Figure (Note 3) 56dB

IIP3 (Notes 3, 4) 15 18

dBm

PCS LNA PERFORMANCE

CDMA HIGH-GAIN, HIGH-LINEARITY MODE

Gain (Note 2)

Noise Figure (Note 3) TA = +25°C 1.4 1.7 dB

Noise Figure Change Due to Temperature

= +25°C to T

MAX

0.3 dB

IIP3 (Notes 3, 5) 5.0 7.7

dBm

CDMA HIGH-GAIN, LOW-LINEARITY MODE

Gain (Note 2)

Noise Figure (Note 3) TA = +25°C 1.4 1.7 dB

IIP3 (Notes 3, 5) 2.5 7.5

dBm

CELLULAR MIXER PERFORMANCE

CDMA HIGH-GAIN, HIGH-LINEARITY, AND LOW-GAIN MODES

Gain (Note 2)

Noise Figure (Note 3) TA = +25°C 7.8 9.0 dB

IIP3 (Note 4) 3.0 5.5

dBm

869

1930 1990

950 1100

1750 2210

14.0 15.7 17.0

14.7 16.5

-4.0 -2.3

13.8 15.3 16.9

13.0 14.5 16.5

10.3 13.3 16.4

MAX2338

Triple/Dual-Mode CDMA LNA/Mixers

4 _______________________________________________________________________________________

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

HIGH-GAIN, LOW-LINEARITY IDLE MODE

Gain (Note 2)

13 16 dB

Noise Figure (Note 3) TA = +25°C 7.3 9.0 dB

IIP3 (Notes 3, 4) 1.4 3.5

dBm

FM MODE

Gain (Note 2) 6.0 8.8

Noise Figure (Note 3) TA = +25°C 8.7

IIP3 (Note 4) 1.4 3.4

dBm

PCS MIXER PERFORMANCE

CDMA HIGH-GAIN, HIGH-LINEARITY MODE

Gain (Note 2)

17 dB

Noise Figure (Note 3) TA = +25°C 7.8 9.0 dB

IIP3 (Notes 3, 5) 3.5 7.5

dBm

HIGH-GAIN, LOW-LINEARITY MODE

Gain (Note 2)

Noise Figure (Note 3) TA = +25°C 7.2 9.0 dB

IIP3 (Note 5) 0.5 2.5

dBm

ALL MODES

Mixer Output 1dB Compression -1

dBm

4 x 5 Suppression (Note 6)

2 x 2 Inp ut Inter cep t P oi nt ( N otes 3, 7)

25 33

dBm

LO Output Level (Note 3) Into 50Ω or 100Ω load, BUFFEN = HIGH -12 -6

dBm

LO Output Leakage BUFFEN = LOW -35

dBm

LO E m i ssi on at P C S LN A Inp ut P or t -55

dBm

LO Emission at Cellular LNA Input Port

-55

dBm

LO Output Harmonic Suppression BUFFEN = HIGH -15

dBc

PCS band, 80MHz below LO

LO Output Noise Power BUFFEN = HIGH

C ell ul ar b and , 45M Hz b el ow LO

dBm/Hz

RF Ports Return Loss

All active RF ports including 2-element matching

10 dB

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2338 EV kit, VCC= +2.7V to +3.3V, f

PLNAIN

= f

PMIXIN

= 1930MHz to 1990MHz, f

CLNAIN

= f

CMIXIN

= 869MHz to 894MHz, fIF=

183MHz, high side LO, LO/2 = LOW. All ports matched to 50Ω, R

RLNA

= R

RBIAS

= 24kΩ, TA= -40°C to +85°C. Typical values are at

= +25°C, VCC= +3.0V, unless otherwise noted.)

Note 1: Operation over this frequency range may require the ports to be rematched for the desired operating frequency. Note 2: MIN guaranteed by production test, MAX guaranteed by design and characterization. Note 3: Guaranteed by design and device characterization. Note 4: Two-tone IIP3. Tested at f

RF1

= 880MHz, f

RF2

= 880.9MHz, and power = -25dBm/tone.

Note 5: Two-tone IIP3. Tested at f

RF1

= 1960MHz, f

RF2

= 1961.25MHz, and power = -25dBm/tone.

Note 6: F

= 1064MHZ, f

RF1

= 887.8MHz at -30dBm, f

RF2

= 881MHz at -100dBm. Performance is measured as P

due to

RF1 - P

due to RF2.

Note 7: F

= 2143MHz, f

RF1

= 2051.5MHz at -35dBm, f

RF2

= 1960MHz at -100dBm. Performance is measured as P

due to

RF1 - P

due to RF2.

10.1

11.1

11.0

11.7 14.5

11.2

>45

-161

16.2

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