Rainbow Electronics MAX2325 User Manual

________________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 appli­cations by providing switched signal paths for cellular FM,
cellular CDMA, and PCS CDMA. The MAX2325 is a cellu­lar-band dual-mode version.

To optimize cellular-band dynamic range at minimum cur­rent, 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 stand­by 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

♦ 2.7V Operation

♦ Dual Band, Triple Mode

♦ Three LNA Gain Settings (Cellular)

♦ Two LNA Gain Settings (PCS)

♦ 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

♦ 2.5dB (typ) Cascade Noise Figure

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

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

MAX2323/MAX2325

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 [phone].
For small orders, phone [phone].

Pin Configuration/

Functional Diagram

Typical Application Circuits appear at end of data sheet.

T

Ordering Information

PART TEMP. RANGE PIN- PACKAGE

MAX2323EGI -40°C to +85°C 28 QFN
MAX2325EGI -40°C to +85°C
MAX2323EVKIT -40°C to +85°C

28 QFN

28 QFN

TOP VIEW

RLNA

PLNAIN

GND

CLNAIN

SLEEP

G2

G1

CLNAOU

GND

PLNAOUTGND

27

28 22

1

2

3

4

5

6

7

8

9

GND

LOLIN

2526

MAX2323

10 11 12 13 14

GND

LOHIN

QFN

GND

GND

2324

PMIXIN

GND

CMIXIN

MODE.

21

20

19

18

17

16

15

RBIAS

CDMA+

CDMA-

GND

BAND

V

CC

FMOUT

MAX2323/MAX2325

Triple/Dual-Mode
CDMA LNA/Mixers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +3.6V, R

RBIAS

= 20kΩ, R

RLNA

= 24kΩ, TA= -40°C to +85°C, no RF applied. Typical values are VCC= 2.75V and

T

A

= +25°C, unless otherwise noted.)

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, +4.3V

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

CC

+ 0.3V)

LNA Input Level .....................................................................1Vp

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

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

Continuous Power Dissipation (T

A

= +70°C)
28-Pin QFN (derate 28.5mW/°C
above T

A

= +70°C) ...................................................2000mW

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

PCS CDMA MODE (MAX2323)

PARAMETER CONDITIONS MIN TYP MAX UNITS

CELLULAR CDMA MODE (MAX2323/MAX2325)

Operating Supply Current

FM MODE (MAX2323/MAX2325)

Operating Supply Current

SHUTDOWN MODE

Shutdown Supply Current SLEEP = high 1 25 µA

ALL MODES

Digital Input Logic High Except SLEEP input 2.0 V

SLEEP Input Logic High

Digital Input Logic Low 0.6 V
Digital Input Current High 5 µA
Digital Input Current Low -25 µA

Midgain mode 20.5 24

High-gain, low-linearity idle mode 22 25.5Operating Supply Current

High-gain, high-linearity mode 25.5 30

Low-gain mode 18.0 21.5

Midgain mode 19.5 23.5

High-gain, low-linearity idle mode 19.5 23.5

High-gain, high-linearity mode 26.5 31.5

Low-gain mode 15 18

Midgain mode 16.5 20

High-gain, low-linearity mode 16.5 20

High-gain, high-linearity mode 23.5 28

V

-

CC

0.6

mA

mA

mA

V

MAX2323/MAX2325

Triple/Dual-Mode

CDMA LNA/Mixers

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2323 EV kit, F

PLNAIN

= 1960MHz, F

CLNAIN

= 881MHz, FIF= 110MHz, high-side LO, 50Ω system, R

RBIAS

= 20kΩ,

R

RLNA

= 24kΩ. Typical values are VCC= 2.75V, TA= +25°C. LO input power = -7dBm, LOW = 0V, HIGH = VCC, unless otherwise

noted.) (Note 1)

OVERALL PERFORMANCE

Low-Band RF Frequency Range (Note 2) 850 950 MHz

High-Band RF Frequency
Range

Low-Band LO Frequency Range (Note 2)

High-Band LO Frequency
Range

IF Frequency Range (Note 2) 40 400 MHz
LO Input Level 100Ω input impedance -7 -5 0 dBm

CELLULAR LNA PERFORMANCE (MAX2323/MAX2325)

CDMA AND FM HIGH-GAIN, HIGH-LINEARITY MODES

Gain TA = T

Noise Figure 1.7 1.9 dB

IIP3

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

Gain TA = T

LNA Noise Figure 1.7 1.9 dB

LNA IIP3 (Note 3)

CDMA AND FM MIDGAIN MODES

Gain TA = T

Noise Figure 3.3 3.5 dB

IIP3 (Note 3)

CDMA AND FM LOW-GAIN MODES

Gain TA = T

Noise Figure 7.5 8.5 dB

IIP3 (Note 3) 13 17.5 dBm

PCS LNA PERFORMANCE (MAX2323)

CDMA HIGH-GAIN, HIGH-LINEARITY MODE

Gain TA = T

Noise Figure 1.9 2.1 dB

IIP3 (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX2323 (Note 2) 1800 2200 MHz

MAX2323 (Note 2) 1600 2300 MHz

MIN

MIN

MIN

MIN

MIN

800 1150 MHz

to T

to T

to T

to T

to T

MAX

MAX

MAX

MAX

MAX

TA = +25°C 9 10.5

= T

= T

= T

= T

MIN

MIN

MIN

MIN

to T

to T

to T

to T

MAX

MAX

MAX

MAX

T

A

TA = +25°C 2.5 5
T

A

TA = +25°C 8.5 10

T

A

TA = +25°C78

T

A

14.5 15.5 17 dB

7.5

13 14.5 16 dB

2.7

4.5 6 8 dB

5

-4.5 -3.5 -1.5 dB

13.5 14.5 15.5 dB

5.5

dBm

dBm

dBm

dBm

Note 1: Devices are production tested for functionality at frequencies stated; 30 units from 3 independent wafer lots, when one lot

was at the upper process extreme, one lot was nominal, and one lot was at the lower process extreme, were characterized.
The resulting standard deviation therefore includes process variations. Data sheet limits are ±3σ from the mean.

Note 2: Operation over this frequency range requires the ports to be rematched for the desired operating range. Performance at

various frequencies is indicated by the S-parameter data in Tables 3–7.

Note 3: Specifications are based on R

BIAS

= 20kΩ. ICCfor all LNAs (except HGHL) and mixers are inversely proportional to R

RBIAS

.

IIP3 can be traded for I

CC

by selecting other values of R

RBIAS

.

MAX2323/MAX2325

Triple/Dual-Mode
CDMA LNA/Mixers

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2323 EV kit, F

PLNAIN

= 1960MHz, F

CLNAIN

= 881MHz, FIF= 110MHz, high-side LO, 50Ω system, R

RBIAS

= 20kΩ,

R

RLNA

= 24kΩ. Typical values are VCC= 2.75V, TA= +25°C. LO input power = -7dBm, LOW = 0V, HIGH = VCC, unless otherwise

noted.) (Note 1)

CDMA HIGH-GAIN, LOW-LINEARITY PAGING MODE

Gain TA = T

LNA Noise Figure 1.9 2.1 dB

LNA IIP3 (Note 3)

CDMA MIDGAIN MODE

Gain TA = T

Noise Figure 5.6 6.0 dB

IIP3 (Note 3)

CELLULAR MIXER PERFORMANCE (MAX2323/MAX2325)

CDMA, ALL MODES

Gain TA = T

Noise Figure 7.5 8.5 dB

IIP3 TA = T

FM MODE

Gain TA = T

Noise Figure 10.5 11.5 dB

IIP3 TA = T

PCS MIXER PERFORMANCE (MAX2323)

CDMA HIGH-GAIN, HIGH-LINEARITY MODE

Gain TA = T

Noise Figure 7.9 8.5 dB

IIP3 TA = T

PARAMETER CONDITIONS MIN TYP MAX UNITS

to T

MIN

to T

MIN

to T

MIN

to T

MIN

to T

MIN

to T

MIN

to T

MIN

to T

MIN

MAX

TA = +25°C

T

= T

MIN

to T

MAX

A

MAX

MAX

(Note 3) 3.5 4.8 dBm

MAX

MAX

(Note 3) 1.5 5 dBm

MAX

MAX

(Note 3) 1.5 4 dBm

MAX

12.5 14 14.5 dB

4.5 5.5

3.0

-2.0 -1.0 -0.5 dB

12 13.5 dBm

11.5 13 14.5 dB

8.5 10 11.5 dB

12 13.5 15.5 dB

dBm

MAX2323/MAX2325

Triple/Dual-Mode

CDMA LNA/Mixers

_______________________________________________________________________________________ 5

Pin Description

PIN

MAX2323 MAX2325

1 1 RLNA

— 2, 10, 23 N.C. No Connection. Leave this pin floating.

2 — PLNAIN

3, 8, 11,

12, 13, 18,

24, 25, 27

4 4 CLNAIN

5 5 SLEEP Logic Input. High shuts off entire device.

6 6 G2 Logic Input. See Tables 1 and 2 for details.

7 7 G1 Logic Input. See Tables 1 and 2 for details.

9 9 LOLIN

10 — LOHIN

14 14 MODE Logic Input. See Tables 1 and 2 for details.

15 15 FMOUT

16 16 V

17 — BAND Logic Input. High selects high band (PCS). Low selects low band (cellular).

19, 20 19, 20

21 21 RBIAS

22 22 CMIXIN

23 — PMIXIN

26 — PLNAOUT

—

3, 8, 11, 12,

13, 17, 18,

24, 25, 27

26

NAME FUNCTION

L N A B i a s - S e t t i ng P i n . F o r no m i n a l b i a s , c o n n ec t a 24 k Ω r es i s t o r t o g r o u n d . T h i s
r e si s t o r v a l u e c a n b e a d j u st e d t o a l t e r t h e l i n e a r i t y o f t h e i np u t L N A i n hi g h - g ai n ,
h i g h - l i n ea r i t y C D M A m o d e s .

High-Band RF Input Port. Blocking capacitor is required, which may be used as part of
the matching network.

GND Ground

Low-Band RF Input Port. Blocking capacitor is required, which may be used as part of
the matching network.

Low-Frequency LO Input Port. Requires blocking capacitor, which may be used as
part of an optional matching network.

High-Frequency LO Input Port. Requires blocking capacitor, which may be used as
part of an optional matching network.

FM IF Output Port. Requires a pull-up inductor and a DC blocking capacitor, which
may be used as part of the matching network.

CC

CDMA-,
CDMA+

V

CC

2.7V to 3.6V Supply Pin. Must be capacitively bypassed near the pin.

Differential Output Port for CDMA Mode. Requires pull-up inductors and blocking
capacitors, which may be used as part of the matching network.

Bias Setting Pin. For nominal bias, connect a 20kΩ resistor to ground. This resistor
value can be adjusted to alter the linearity of the mixers in all modes and the LNA in all
modes except high gain and high linearity.

Low-Band Mixer Input Port. Requires blocking capacitor, which may be used as part of
the matching network.

High-Band Mixer Input Port. Requires blocking capacitor, which may be used as part
of the matching network.

High-Band LNA Output Port. This port requires an external pull-up inductor and series
capacitor as part of the matching network.

2.7 to 3.6V Supply Pin. Bypassing is not necessary at this pin.