MAXIM MAX2335 User Manual

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General Description

The MAX2335 RF front-end receiver IC is designed for
CDMA and OFDM applications in the 450MHz band.

The MAX2335 includes a low-noise amplifier (LNA) with
adjustable IIP3 to minimize desensitization due to cross­modulation in the presence of a large interfering signal.

The mixer features differential IF outputs and is
designed for high linearity and low noise, which is well
suited for CDMA and OFDM applications.

An on-chip frequency divider is included to allow the
use of a standard 1GHz VCO. Alternatively, the divider
can be bypassed for use with a lower-frequency VCO.

The MAX2335 is available in a 28-pin TQFN package
with exposed paddle and is specified for the -40°C to
+85°C extended temperature range. The device is also
offered in a lead-free package.

Features

♦ 1.5dB LNA Noise Figure

♦ 16dB LNA Gain

♦ 2.1dB Cascaded Noise Figure

♦ Adjustable LNA IIP3

♦ LO Output Buffer for Transmitter

♦ LO Frequency Divider

♦ Small 5mm x 5mm, 28-Pin (Lead-Free) TQFN

Package

MAX2335

450MHz CDMA/OFDM LNA/Mixer

________________________________________________________________ Maxim Integrated Products 1

MAX2335

TOP VIEW

÷2

THIN QFN

5mm x 5mm

26

27

25

24

10

9

11

R

LNA

LNAIN

MODEO

MODE1

MODE2

12

DEGEN

IF_CDMA+

N.C.

BUFFEN

EP

R

BIAS

VCCV

CC

12

N.C.

4567

2021 19 17 16 15

V

CC

N.C.

I.C.

N.C.

LO_IN

LO/2

GND

IF_CDMA-

3

18

28

8

LNAOUT

N.C.

N.C.

23

13

LO_OUT

I.C.

22

14

N.C.

MIXIN

+

Pin Configuration/

Functional Diagram

Ordering Information

19-0492; Rev 0; 10/05

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.

*EP = Exposed paddle.
+Denotes lead-free package.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

PKG

CODE

MAX2335ETI

(5mm x 5mm)

T2855-3

MAX2335ETI+

(5mm x 5mm)

T2855+3

Applications

450MHz-Band, WCDMA, IS-95, IS-2000, OFDM,
Wireless Data Links

-40°C to +85°C

-40°C to +85°C

28 Thin QFN-EP*

28 Thin QFN-EP*

MAX2335

450MHz CDMA/OFDM LNA/Mixer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.9V to +3.3V, R

BIAS

= 18kΩ, R

LNA

= 24kΩ, BUFFEN = LOW, LO/2 = HIGH, TA= -40°C to +85°C, unless otherwise noted.

Typical values are at V

CC

= +2.9V, LOW = 0V, HIGH = +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 +4.3V

All Other Pins to GND.................................-0.3V to (V

CC

+ 0.3V)

AC Input Pins (LNAIN, LO_IN, MIXIN) to GND ...............1V Peak

Continuous Power Dissipation (T

A

= +70°C)

28-Pin Thin QFN (derate 34.5mW/°C above +70°C) ...........2.7W

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

CAUTION! ESD SENSITIVE DEVICE

PARAMETER

CONDITIONS

UNITS

HGHL mode (MODE[2:0] = 111) 32 38

HGLL mode (MODE[2:0] = 101) 24 29

Operating Supply Current I

CC

LG mode (MODE[2:0] = 011) 27 31

mA

Shutdown Supply Current I

CC

Shutdown mode (MODE[2:0] = 000) 0.2 10 µA

LO Buffer Supply Current I

CC

Addition for BUFFEN = HIGH 7 13 mA

Digital Input-Logic High V

IH

2V

Digital Input-Logic Low V

IL

0.6 V

Digital Input Current (Logic-High)

I

IH

5µA

Digital Input Current (Logic-Low)

I

IL

-25 µA

AC ELECTRICAL CHARACTERISTICS

(MAX2335 EV Kit, VCC= +2.9V to +3.3V, f

LNAIN

= f

MIXIN

= 465MHz, fIF= 110MHz, fLO= 2 x (f

MIXIN

+ fIF), 50Ω system impedance,

R

BIAS

= 18kΩ, R

LNA

= 24kΩ, cascaded performance includes 2dB interstage filter loss, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at V

CC

= +2.9V, P

LO_IN

= -7dBm, LOW = 0V, HIGH = +3.0V, TA= +25°C, unless otherwise noted.)

SYMBOL

MIN TYP MAX

OVERALL PERFORMANCE

RF Frequency Range f

LO Frequency Range f

IF Frequency Range f

LO Input Power (Note 2) -7 -3 0 dBm

LO Buffer Output Power BUFFEN = HIGH -10 -6 dBm

Return Loss

CASCADED PERFORMANCE

HIGH-GAIN, HIGH-LINEARITY MODE (MODE[2:0] = 111)

Gain G (Note 1) 23.0 27 31.5 dB

Noise Figure NF Incl ud i ng off- chi p m atchi ng , TA = + 25°C ( N ote 2) 2.2 2.6 dB

Input Third-Order Intercept Point IIP3 TA = + 25°C (Notes 1, 3) -14 -11.5 dBm

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RF

LO

IF

After optional LO/2 500 to 660 MHz

All modes, all active ports, including
2-element matching network, if necessary

420 to 470 MHz

80 to 190 MHz

10 dB

MAX2335

450MHz CDMA/OFDM LNA/Mixer

_______________________________________________________________________________________ 3

Note 1: Specifications at TA= +25°C and +85°C are guaranteed by production test. Specifications at TA= -40°C are guaranteed

by design and characterization.

Note 2: Guaranteed by design and characterization.
Note 3: Two-tone IIP3 tested at f

RF1

= 465.9MHz and f

RF2

= 466.7MHz at -25dBm/tone.

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2335 EV Kit, VCC= +2.9V to +3.3V, f

LNAIN

= f

MIXIN

= 465MHz, fIF= 110MHz, fLO= 2 x (f

MIXIN

+ fIF), 50Ω system impedance,

R

BIAS

= 18kΩ, R

LNA

= 24kΩ, cascaded performance includes 2dB interstage filter loss, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at V

CC

= +2.9V, P

LO_IN

= -7dBm, LOW = 0V, HIGH = +3.0V, TA= +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

TYP

UNITS

HIGH-GAIN, LOW-LINEARITY MODE (MODE[2:0] = 101)

Gain G (Note 1)

26.5

dB

Noise Figure NF

2.1

dB

Input Third-Order Intercept Point

IIP3 TA = + 25°C (Notes 1, 3)

-12.5

dBm

LOW-GAIN MODE (MODE[2:0] = 011)

Gain G (Note 1) 5 9

dB

Noise Figure NF

12

dB

Input Third-Order Intercept Point

IIP3 TA = + 25°C (Notes 1, 3) 3 7

dBm

LNA PERFORMANCE

HIGH-GAIN, HIGH-LINEARITY MODE (MODE[2:0] = 111)

Gain G

LNA

15.5 dB

Noise Figure

Including off-chip matching 1.7 dB

Input Third-Order Intercept Point

(Note 3) +7

dBm

HIGH-GAIN, LOW-LINEARITY MODE (MODE[2:0] = 101)

Gain G

LNA

14.5 dB

Noise Figure NF

LNA

Including off-chip matching 1.5 dB

Input Third-Order Intercept Point

IIP3

LNA

(Note 3) +5

dBm

LOW-GAIN MODE (MODE[2:0] = 011)

Gain G

LNA

-2.7 dB

Noise Figure

Including off-chip matching 5.5 dB

Input Third-Order Intercept Point

(Note 3) +14

dBm

MIXER PERFORMANCE

HIGH-GAIN, HIGH-LINEARITY MODE (MODE[2:0] = 111)

Gain

14 dB

Noise Figure

Including off-chip matching 7 dB

Input Third-Order Intercept Point

(Note 3) +2

dBm

HIGH-GAIN, LOW-LINEARITY MODE (MODE[2:0] = 101)

Gain

13.5 dB

Noise Figure

Including off-chip matching 6.7 dB

Input Third-Order Intercept Point

(Note 3) 0

dBm

LOW-GAIN MODE (MODE[2:0] = 011)

Gain

14 dB

Noise Figure

Including off-chip matching 7 dB

Input Third-Order Intercept Point

(Note 3) +2

dBm

SYMBOL

IIP3

IIP3

G

NF

IIP3

G

NF

IIP3

G

NF

IIP3

Incl ud i ng off- chi p m atchi ng , TA = + 25°C ( N ote 2)

Incl ud i ng off- chi p m atchi ng , TA = + 25°C ( N ote 2)

NF

LNA

LNA

NF

LNA

LNA

MIXER

MIXER

MIXER

MIXER

MIXER

MIXER

MIXER

MIXER

MIXER

MIN

21.0

MAX

30.5

2.5

-15

14

15

MAX2335

450MHz CDMA/OFDM LNA/Mixer

4 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX2335 EV Kit, VCC= +2.9V, f

LNAIN

= 465MHz, fIF= 110MHz, f

LO_IN

= 1150MHz, P

LO_IN

= -7dBm, R

BIAS

= 18kΩ, R

LNA

= 24kΩ,

TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT (HGHL)

vs. TEMPERATURE

MAX2335 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

603510-15

28

30

32

34

26

-40 85

LNA GAIN VS RF FREQUENCY

MAX2335 toc02

RF FREQUENCY (MHz)

LNA GAIN (dB)

480460440420

-4

0

4

8

12

16

20

-8
400 500

HG

LG

6

4

2

0

400

LG

HG

440420 460 480 500

LNA NOISE FIGURE vs. RF FREQUENCY

MAX2335 toc03

RF FREQUENCY (MHz)

LNA NOISE FIGURE (dB)

5

6

8

7

9

10

-40 10-15 35 60 85

LNA HGHL IIP3 vs. TEMPERATURE

MAX2335 toc04

TEMPERATURE (°C)

LNA HGHL IIP3 (dBm)

R

LNA

= 18kΩ

R

LNA

= 24kΩ

MIXER HGHL IIP3 vs. TEMPERATURE

MAX2335 toc05

TEMPERATURE (°C)

MIXER HGHL IIP3 (dBm)

603510-15

-1

0

1

2

3

4

-2

-40 85

R

BIAS

= 18kΩ

R

BIAS

= 24kΩ

MIXER HG NOISE FIGURE

vs. RF FREQUENCY

MAX2335 toc06

RF FREQUENCY (MHz)

MIXER HG NOISE FIGURE (dB)

480460440420

6.6

6.8

7.0

6.4
400 500

20

15

10

5

0

2.0

1.5

1.0

0.5

0

0 200100 300 400 500

MIXER IF PORT DIFFERENTIAL

PORT IMPEDANCE

MAX2335 toc07

RF FREQUENCY (MHz)

EQUIVALENT PARALLEL RESISTANCE (kΩ)

EQUIVALENT PARALLEL CAPACITANCE (pF)

CAPACITANCE

RESISTANCE