The MAX2209 is a wideband (800MHz to 2GHz) RF
power detector. It takes an RF signal from the directional
coupler at the input, and outputs a DC voltage propor-
tional to the RF peak voltage. The change in output
voltage versus temperature is very repeatable from part
to part and enables a lookup table based on nominal
behavior, minimizing the effective detection error to less
than Q0.5dB relative to room temperature.
The MAX2209 comes in a space-saving 2 x 2, 0.5mm
pitch wafer-level package (WLP) and requires only two
external components.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
4-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Note 2: For detailed information on soldering, refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
CAUTION! ESD SENSITIVE DEVICE
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 5.0V, T
noted.) (Note 3)
PARAMETERCONDITIONSMINTYPMAXUNITS
Supply Voltage2.75.0V
Supply Current3.66mA
Idle Output VoltageVCC = 2.8V, no RF signal35mV
Output Current Source CapabilityPIN = 0dBm, V
Output Current Sink CapabilityNo RF signal, V
= -40NC to +85NC, no RF signal applied. Typical values are at VCC = 2.8V, T
A1OUTDetector Output
A2V
B1GNDGround Connection. Connect to PCB ground plane with as low inductance as possible.
B2RFIN
CC
Detailed Description
The MAX2209 power detector is designed to operate from 800MHz to 2.0GHz. The device is ideal for
wideband code-division multiple access (WCDMA),
cdma2000M, and high-speed downlink/uplink packet
access. The MAX2209 accepts an RF signal at the input,
and outputs a temperature-independent voltage related
to the input signal voltage. The output voltage expressed
in dBV is proportional to the input power expressed in
dBm. The device has a detection range from -25dBm to
0dBm.
Applications Information
The MAX2209 contains an internal termination resistor
for use with directional couplers. The typical application
circuit is shown in Figure 1. The output of the detector
goes to an ADC for further processing by the baseband
system. Connect a series resistor and shunt capacitor to
the MAX2209 output to reduce residual amplitude ripple.
Power Supply. Bypass to GND with a capacitor as close as possible to the bump.
RF Input. Internally terminated to 50I. AC-couple the RF input to this pin.
ADC
PA
MAX2209
A1
OUT
B1
GND
DIRECTIONAL
COUPLER
A2
V
CC
B2
RFIN
V
CC
RF INPUT
TO
ANTENNA
MAX2209
Layout
There are two areas that require attention: the GND pin
and the supply bypassing. Connect the GND pin to the
PCB ground with a GND via as close as possible, and
bypass VCC to ground with a capacitor as close as possible to the part.
Chip Information
PROCESS: BIPOLAR
cdma2000 is a registered trademark of the Telecommunications
Industry Association.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 5
2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Figure 1. Typical Application Circuit
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that
a “+”, “#”, or “-” in the package code indicates RoHS
status only. Package drawings may show a different suffix character, but the drawing pertains to the package
regardless of RoHS status.
PACKAGE TYPEPACKAGE CODEDOCUMENT NO.
4 UCSPB4+4
21-0117
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