________________General Description

The MAX2323/MAX2325 are low-noise amplifier (LNA)

plus mixer ICs optimized for code-division multiple-access

(CDMA) applications in both cellular and PCS bands. The

MAX2323 addresses dual-band, triple-mode CDMA appli-

cations by providing switched signal paths for cellular FM,

cellular CDMA, and PCS CDMA. The MAX2325 is a cellu-

lar-band dual-mode version.

To optimize cellular-band dynamic range at minimum cur-

rent, the MAX2323/MAX2325 implement four LNA states:

high gain/high linearity, high gain/low linearity, midgain,

and low gain. In high-gain/high-linearity mode, the

adjustable high-intercept LNA minimizes desensitization in

the presence of a large interfering signal. For the other

gain states, the LNA current is reduced to improve stand-

by time.

The CDMA mixers are designed for high linearity, low

noise, and differential IF outputs, while the FM mixer is

designed for lower current and single-ended output. Each

band is implemented with a separate mixer to optimize

performance for the specific band.

The MAX2323/MAX2325 can also be used in TDMA,

EDGE, and W-CDMA phones.

________________________Applications

Dual-Band, Triple-Mode PCS/Cellular Phones

Dual-Mode Cellular Phones

____________________________Features

o 2.7V Operation

o Dual Band, Triple Mode

o Three LNA Gain Settings (Cellular)

o Two LNA Gain Settings (PCS)

o 18mA in Low-Gain Mode

19.5mA in Paging and Midgain Mode

26.5mA in High-Gain, High-Linearity Mode

16.5mA in FM Mode, High-Gain, Low-Linearity

Mode

o 2.5dB (typ) Cascade Noise Figure

o Adjustable LNA IIP3, +5dBm to +13dBm

o Ultra-Small 28-Pin Package (5mm x 5mm)

Triple/Dual-Mode

CDMA LNA/Mixers

________________________________________________________________ Maxim Integrated Products

1

19-1736; Rev 0; 7/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Pin Configuration/

Functional Diagram

Typical Application Circuits appear at end of data sheet.

MAX2323

25

26

27

28

22

23

24

8

9

10

11

12

13

14

15

16

17

18

19

20

21

1

2

3

4

5

6

7

GND

CLNAIN

SLEEP

G2

G1

PLNAIN

RLNA

CDMA-

GND

BAND

FMOUT

CDMA+

RBIAS

QFN

TOP VIEW

PART

TEMP. RANGE

PIN- PACKAGE

MAX2323EGI

-40

°C to +85°C

28 QFN

MAX2325EGI

-40

°C to +85°C

28 QFN

MAX2323EVKIT

-40

°C to +85°C

28 QFN

Ordering Information