EVALUATION KIT AVAILABLE
MAX9985
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
General Description
Features
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
850/950, 2G/2.5G EDGE, WCDMA, cdma2000®, and
iDEN® base-station applications.
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
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.
P
RF
= -10dBm
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
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-
Inputs
o Built-In SPDT LO Switch with 43dB LO1-to-LO2
Isolation and 50ns Switching Time
ture range, from T = -40°C to +100°C.
C
o Pin-Compatible with MAX9995 1700MHz to
Applications
2200MHz Mixer
850MHz WCDMA Base Stations
o Lead(Pb)-Free Package
GSM 850/GSM 950, 2G/2.5G EDGE Base
Stations
cdmaOne™ and cdma2000 Base Stations
iDEN Base Stations
Ordering Information
PKG
CODE
PART
TEMP RANGE PIN-PACKAGE
Fixed Broadband Wireless Access
Wireless Local Loop
36 Thin QFN-EP*
MAX9985ETX+
-40°C to +100°C (6mm x 6mm), T3666-2
lead free, bulk
Private Mobile Radios
Military Systems
36 Thin QFN-EP*
(6mm x 6mm),
lead free, T/R
Digital and Spread-Spectrum Communication
Systems
MAX9985ETX+T -40°C to +100°C
T3666-2
Microwave Links
*EP = Exposed paddle.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
T = Tape-and-reel package.
+Denotes lead(Pb)-free and RoHS compliant.
iDEN is a registered trademark of Motorola, Inc.
cdmaOne is a trademark of CDMA Development Group.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0705 Rev 1; 12/12