MAX19985A Datasheet, PDF (1/23 Pages) Maxim Integrated Products – Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch

19-4185; Rev 0; 8/08
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
General Description
The MAX19985A high-linearity, dual-channel, downcon-
version mixer is designed to provide approximately
8.7dB gain, +25.5dBm of IIP3, and 9.0dB of noise fig-
ure for 700MHz to 1000MHz diversity receiver applica-
tions. With an optimized LO frequency range of
900MHz to 1300MHz, this mixer is ideal for high-side
LO injection architectures in the cellular and new
700MHz bands. Low-side LO injection is supported by
the MAX19985, which is pin-pin and functionally com-
patible with the MAX19985A.
In addition to offering excellent linearity and noise per-
formance, the MAX19985A also yields a high level
of component integration. This device includes two
double-balanced passive mixer cores, two LO buffers,
a dual-input LO selectable switch, and a pair of differ-
ential IF output amplifiers. On-chip baluns are also inte-
grated to allow for single-ended RF and LO inputs.
The MAX19985A requires a nominal LO drive of 0dBm
and a typical supply current of 330mA at V_CC = +5.0V
or 280mA at V_CC = +3.3V.
The MAX19985/MAX19985A are pin compatible with
the MAX19995/MAX19995A series of 1700MHz to
2200MHz mixers and pin similar with the MAX19997A/
MAX19999 series of 1850MHz to 3800MHz mixers,
making this entire family of downconverters ideal for
applications where a common PCB layout is used
across multiple frequency bands.
The MAX19985A is available in a 6mm x 6mm, 36-pin
thin QFN package with an exposed pad. Electrical per-
formance is guaranteed over the extended temperature
range of T_C = -40°C to +85°C.
Applications
850MHz WCDMA and cdma2000^® Base Stations
700MHz LTE/WiMAX™ Base Stations
GSM850/900 2G and 2.5G EDGE Base Stations
iDEN^® Base Stations
Fixed Broadband Wireless Access
Wireless Local Loop
Private Mobile Radios
Military Systems
Features
o 700MHz to 1000MHz RF Frequency Range
o 900MHz to 1300MHz LO Frequency Range
o 50MHz to 500MHz IF Frequency Range
o 8.7dB Typical Conversion Gain
o 9.0dB Typical Noise Figure
o +25.5dBm Typical Input IP3
o +12.6dBm Typical Input 1dB Compression Point
o 76dBc Typical 2LO-2RF Spurious Rejection at
P_RF = -10dBm
o Dual Channels Ideal for Diversity Receiver
Applications
o 48dB Typical Channel-to-Channel Isolation
o Low -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 46dB LO1-to-LO2
Isolation and 50ns Switching Time
o Pin Compatible with the MAX19995/MAX19995A
Series of 1700MHz to 2200MHz Mixers
o Pin Similar to the MAX19997A/MAX19999 Series
of 1850MHz to 3800MHz Mixers
o Single +5.0V or +3.3V Supply
o External Current-Setting Resistors Provide Option
for Operating Device in Reduced-Power/Reduced-
Performance Mode
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX19985AETX+
-40°C to +85°C 36 Thin QFN-EP*
MAX19985AETX+T -40°C to +85°C 36 Thin QFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape and reel.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
WiMAX is a trademark of WiMAX Forum.
iDEN is a registered trademark of Motorola, Inc.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.