MAX9985 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch

19-0705 Rev 0; 1/07
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
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
850/950, 2G/2.5G EDGE, WCDMA, cdma2000^®, and
iDEN^® base-station applications.
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-
ture range, from T_C = -40°C to +85°C.
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
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.
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
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
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
Ordering Information
PART
MAX9985ETX
TEMP RANGE PIN-PACKAGE
PKG
CODE
-40°C to +85°C ^{36 Thin QFN-EP*} T3666-2
(6mm x 6mm)
MAX9985ETX-T
36 Thin QFN-EP*
-40°C to +85°C (6mm x 6mm), T3666-2
T/R
MAX9985ETX+
36 Thin QFN-EP*
-40°C to +85°C (6mm x 6mm), T3666-2
lead free, bulk
36 Thin QFN-EP*
MAX9985ETX+T -40°C to +85°C (6mm x 6mm), T3666-2
lead free, T/R
*EP = Exposed paddle.
T = Tape-and-reel package.
+Denotes lead-free and RoHS compliant.
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1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.