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RF Power Detector
Pin Description
BUMP
A1
A2
B1
B2
NAME
OUT
V CC
GND
RFIN
FUNCTION
Detector Output
Power Supply. Bypass to GND with a capacitor as close as possible to the bump.
Ground Connection. Connect to PCB ground plane with as low inductance as possible.
RF Input. Internally terminated to 50 I . AC-couple the RF input to this pin.
Detailed Description
The MAX2209 power detector is designed to oper-
ate from 800MHz to 2.0GHz. The device is ideal for
wideband code-division multiple access (WCDMA),
PA
DIRECTIONAL
COUPLER
TO
ANTENNA
cdma2000 M , 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.
MAX2209
Applications Information
The MAX2209 contains an internal termination resistor
ADC
A1
OUT
A2
V CC
V CC
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
B1
GND
B2
RFIN
RF INPUT
the MAX2209 output to reduce residual amplitude ripple.
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 V CC to ground with a capacitor as close as pos-
sible to the part.
Chip Information
PROCESS: BIPOLAR
Figure 1. Typical Application Circuit
Package Information
For the latest package outline information and land pat-
terns, 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 suf-
fix character, but the drawing pertains to the package
regardless of RoH S status.
PACKAGE TYPE
4 UCSP
PACKAGE CODE
B4+4
DOCUMENT NO.
21-0117
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.
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