General Description

The MAX9985 high-linearity, dual-channel downconver-

sion mixer is designed to provide approximately 6dB

gain, +28.5dBm of IIP3, and 10.5dB of noise figure (NF)

ideal for diversity receiver applications. With a 700MHz

to 1000MHz RF frequency range and a 570MHz to

865MHz LO frequency range, this mixer is ideal for low-

side LO injection architectures. In addition, the broad

frequency range makes the MAX9985 ideal for GSM

The MAX9985 dual-channel downconverter achieves a

high level of component integration. The MAX9985 inte-

grates two double-balanced active mixer cores, two LO

buffers, a dual-input LO selectable switch, and a pair of

differential IF output amplifiers. In addition, integrated

on-chip baluns at the RF and LO ports allow for single-

ended RF and single-ended LO inputs. The MAX9985

requires a typical 0dBm LO drive. Supply current is

adjustable up to 400mA.

The MAX9985 is available in a 36-pin thin QFN pack-

age (6mm x 6mm) with an exposed paddle. Electrical

performance is guaranteed over the extended tempera-

Applications

850MHz WCDMA Base Stations

GSM 850/GSM 950, 2G/2.5G EDGE Base

Stations

cdmaOne™ and cdma2000 Base Stations

iDEN Base Stations

Fixed Broadband Wireless Access

Wireless Local Loop

Private Mobile Radios

Military Systems

Digital and Spread-Spectrum Communication

Systems

Microwave Links

Features

o 700MHz to 1000MHz RF Frequency Range

o 570MHz to 865MHz LO Frequency Range

o 50MHz to 250MHz IF Frequency Range

o 6dB Typical Conversion Gain

o 10.5dB Typical Noise Figure

o +28.5dBm Typical Input IP3

o +16.2dBm Typical Input 1dB Compression Point

o 77dBc Typical 2RF-2LO Spurious Rejection at

o Dual Channels Ideal for Diversity Receiver

Applications

o 47dB Typical Channel-to-Channel Isolation

o -3dBm to +3dBm LO Drive

o Integrated LO Buffer

o Internal RF and LO Baluns for Single-Ended

Inputs

o Built-In SPDT LO Switch with 43dB LO1-to-LO2

Isolation and 50ns Switching Time

o Pin-Compatible with MAX9995/MAX9995A

1700MHz to 2200MHz Mixers

o Lead-Free Package Available

Dual, SiGe, High-Linearity, 700MHz to 1000MHz

Downconversion Mixer with LO Buffer/Switch

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-0705 Rev 0; 1/07

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.

T = Tape-and-reel package.

+

Denotes lead-free and RoHS compliant.

cdma2000 is a registered trademark of Telecommunications

Industry Association.

iDEN is a registered trademark of Motorola, Inc.

cdmaOne is a trademark of CDMA Development Group.

PART

TEMP RANGE

PIN-PACKAGE

PKG

CODE

MAX9985ETX

-40°C to +85°C

36 Thin QFN-EP*

(6mm x 6mm)

T3666-2

MAX9985ETX-T

-40°C to +85°C

36 Thin QFN-EP*

(6mm x 6mm),

T/R

T3666-2

MAX9985ETX+

-40°C to +85°C

36 Thin QFN-EP*

(6mm x 6mm),

lead free, bulk

T3666-2

MAX9985ETX+T

-40°C to +85°C

36 Thin QFN-EP*

(6mm x 6mm),

lead free, T/R

T3666-2