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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 on-

chip LO frequency divider to allow the use of a single

VCO for both bands. This device is available in an ultra-

small 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.

Summary of content (13 pages)

PAGE 1
9-1807; Rev 1; 3/01 KIT ATION EVALU LE B A IL A AV Triple/Dual-Mode CDMA LNA/Mixers Features 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.
PAGE 2
MAX2338 Triple/Dual-Mode CDMA LNA/Mixers ABSOLUTE MAXIMUM RATINGS VCC to GND..........................................................+0.3V to +4.3V Digital Input Voltage to GND ......................-0.3V to (VCC + 0.3V) LNA Input Level...............................................................1V peak LO, Mixer Input Levels .....................................................+5dBm Digital Input Current .........................................................
PAGE 3
Triple/Dual-Mode CDMA LNA/Mixers (MAX2338 EV kit, VCC = +2.7V to +3.3V, fPLNAIN = fPMIXIN = 1930MHz to 1990MHz, fCLNAIN = fCMIXIN = 869MHz to 894MHz, fIF = 183MHz, high side LO, LO/2 = LOW. All ports matched to 50Ω, RRLNA = RRBIAS = 24kΩ, TA = -40°C to +85°C. Typical values are at TA = +25°C, VCC = +3.0V, unless otherwise noted.
PAGE 4
MAX2338 Triple/Dual-Mode CDMA LNA/Mixers AC ELECTRICAL CHARACTERISTICS (continued) (MAX2338 EV kit, VCC = +2.7V to +3.3V, fPLNAIN = fPMIXIN = 1930MHz to 1990MHz, fCLNAIN = fCMIXIN = 869MHz to 894MHz, fIF = 183MHz, high side LO, LO/2 = LOW. All ports matched to 50Ω, RRLNA = RRBIAS = 24kΩ, TA = -40°C to +85°C. Typical values are at TA = +25°C, VCC = +3.0V, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS 13 16 dB 7.3 9.
PAGE 5
Triple/Dual-Mode CDMA LNA/Mixers HGHL 25 15 10 5 15 LGHL 20 15 HGLL 0 50 100 11 10 -50 0 50 100 4 6 8 10 12 14 TEMPERATURE (°C) TEMPERATURE (°C) LNA CURRENT (mA) CELLULAR-BAND HGHL LNA GAIN vs. CURRENT CELLULAR-BAND LNA GAIN vs. FREQUENCY PCS-BAND LNA GAIN vs.
PAGE 6
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) CELLULAR-BAND HGHL MIXER CONVERSION GAIN vs. CURRENT 6mA 1.2 1.0 0.8 0.6 16 0.4 14 12 TA = +25°C 10 16 TA = +85°C TA = -40°C, HIGH SIDE LO 15 14 13 12 11 TA = -40°C, LOW SIDE LO 10 TA = +25°C, HIGH SIDE LO 9 TA = +25°C, LOW SIDE LO 8 8 TA = +85°C, HIGH SIDE LO 7 0.2 6 0 840 850 860 870 880 890 TA = +85°C, LOW SIDE LO 6 4 900 MAX2338 toc12 11mA 1.4 TA = -40°C CONVERSION GAIN (dB) 16mA 1.
PAGE 7
Triple/Dual-Mode CDMA LNA/Mixers PCS-BAND MIXER NOISE FIGURE vs. RF FREQUENCY CELLULAR-BAND MIXER NOISE FIGURE vs. RF FREQUENCY 8.0 NOISE FIGURE (dB) 7.5 HGLL 7.0 6.5 5.5 5.5 HGLL HIGH SIDE LO 5.0 870 880 890 900 1920 1960 1980 2000 RF FREQUENCY (MHz) CELLULAR-BAND LO BUFFER OUTPUT LEVEL vs.
PAGE 8
Triple/Dual-Mode CDMA LNA/Mixers MAX2338 Pin Description 8 PIN NAME FUNCTION 1 RLNA 2 PLNAIN 3, 8, 11, 18, 24, 25, 27, Exposed Paddle GND 4 CLNAIN Low-Band RF Input. Requires a blocking capacitor which may be used as part of the input matching network. 5 BAND Band-Select Logic Input. LOW selects high-band (PCS), HIGH selects low-band (cellular). 6 LIN 7 GAIN Gain-Select Logic Input. See Detailed Description for control modes. 9 LO/2 LO Divider-Select Input.
PAGE 9
Triple/Dual-Mode CDMA LNA/Mixers The MAX2338 consists of cellular band and PCS band (LNAs) and mixers. The IC also consists of a local oscillator (LO) divider and LO buffers for cellular and PCS bands. Low-Noise Amplifiers The MAX2338 LNAs’ gain and linearity are switched by the GAIN and LIN input, respectively. The PCS band LNA has two operational modes: high-gain high-linearity (HGHL) and high-gain low-linearity (HGLL).
PAGE 10
MAX2338 Triple/Dual-Mode CDMA LNA/Mixers Operational Modes The various operating modes are controlled by the logic inputs BAND, GAIN, LIN, and LO/2. Table 1 shows the pin settings for the various operating modes. Applications Information Cascaded LNA/Mixer Performance The LNA and mixer design optimizes cascaded performance in all gain and linearity modes. In HGHL mode both the LNA and mixer have a low noise figure, high gain, and high linearity.
PAGE 11
Triple/Dual-Mode CDMA LNA/Mixers MAX2338 Layout Considerations Keep RF signal lines as short as possible to minimize losses and radiation. Use high Q components for the LNA input-matching circuit to achieve the lowest possible noise figure. At the digital mixer outputs, keep the differential signal lines together and of equal length to ensure signal balance. For best gain and noise performance, solder the exposed paddle evenly to the board ground plane. Table 3.
PAGE 12
MAX2338 Triple/Dual-Mode CDMA LNA/Mixers Table 4. MAX2338 Cellular Band Mixer Input S-Parameters High-Gain, HighLinearity Mode 12 Table 5. MAX2338 PCS Band Mixer Input S-Parameters High-Gain, High-Linearity Mode FREQUENCY (MHz) |S11| ∠S11 FREQUENCY (MHz) |S11| ∠S11 800 0.843 -67.5 1900 0.762 -76.9 810 0.843 -68.2 1910 0.759 -77.8 820 0.842 -68.8 1920 0.755 -79.0 830 0.842 -69.5 1930 0.752 -80.1 840 0.843 -70.2 1940 0.747 -81.2 850 0.843 -71.0 1950 0.744 -82.
PAGE 13
Triple/Dual-Mode CDMA LNA/Mixers 0.01µF CELL VCC 2.7nH 0.75pFPCS 2.7pF 7pF 20Ω 2.7nH 6800pF 15nH 8.2nH 28 24kΩ 26 27 25 24 22 23 24kΩ PCS 100pF 100pF 120nH 6800pF 2.2nH VCC 21 1 2 20 3 19 4 18 120nH 4pF CDMA 3.3kΩ 4pF 6800pF 3.9nH 100pF CELLULAR BAND 5 LIN 6 GAIN MAX2338 17 BUFFEN 16 ÷2 120nH VCC 8.25kΩ 1% 15 7 4.7pF 8 9 11 10 12 22pF LO/2 PCS LO FM 14 13 N.C. LO_OUT Package Information For the latest package outline information, go to www.