General Description
The MAX2204 RF power detector is designed to oper-
ate from 450MHz to 2.5GHz. The device is ideal for
wideband code-division multiple access (WCDMA),
cdma2000®, and high-speed downlink/uplink packet
access. The MAX2204 accepts an RF signal at the
input, and outputs a highly repeatable voltage. The out-
put voltage increases monotonically with increasing
input power. The device is designed to compensate for
temperature and process shifts, reducing the typical
output variation to less than ±0.5dB at full input power
and ±1.5dB at the lower power.
The MAX2204 features a detection range from -16dBm
to +5dBm. High input impedance allows for low-loss
resistive tap if an isolator is used. The device uses
external termination at the input so that the RF signal
from several directional couplers can be connected to
a single detector chip.
The MAX2204 operates from a 2.7V to 3.3V power
supply. The device is available in a tiny 5-pin SC70 pack-
age. Electrical performance is guaranteed over a -40°C to
+85°C temperature range.
Applications
WCDMA, cdma2000
High-Speed Downlink Packet Access (HSDPA)
High-Speed Uplink Packet Access (HSUPA)
Features
o-16dBm to +5dBm Detection Range
o±0.3dB Detection Error Due to Temperature
o+2.7V to +3.3V Single-Supply Operation
oEasy-to-Assemble, Lead-Free, 5-Pin SC70
Package
MAX2204
RF Power Detector
________________________________________________________________
Maxim Integrated Products
1
GND
ENARFIN
1 5 OUTVCC
MAX2204
TOP VIEW
2
34
+
Pin Configuration
Ordering Information
19-0753; Rev 0; 4/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead-free package.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
PART TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX2204EXK+ -40°C to +85°C 5 SC70 X5+1
EVALUATION KIT
AVAILABLE
MAX2204
RF Power Detector
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 3.3V, TA= -40°C to +85°C, ENA = 2.0V, no RF signal applied. Typical values are at VCC = 2.85V, TA= +25°C, unless
otherwise noted.) (Note 1)
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.
Note 1: Specifications over TA= -40°C to +85°C are guaranteed by design. Production tests are performed at TA= +25°C.
Note 2: Guaranteed by design and characterization.
VCC to GND ...........................................................-0.3V to +3.6V
OUT, Logic Input (ENA) to GND ................-0.3V to (VCC + 0.3V)
RF Input Power ...............................................................+10dBm
Continuous Power Dissipation (TA= +70°C)
(derate 3.1mW/°C above +70°C)................................247mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
θJC ...............................................................................+115°C/W
θJA ...............................................................................+324°C/W
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC 2.7 3.3 V
Operating Supply Current ICC 1.2 2.5 mA
Sleep Mode Supply Current ENA = 0V 0.5 10 µA
ENA Logic-High Threshold VIH 2 V
ENA Logic-Low Threshold VIL 0.6 V
ENA = 2V -2 +10
ENA Input Current ENA = 0.6V -2 +1 µA
AC ELECTRICAL CHARACTERISTICS
(MAX2204 Evaluation Kit, VCC = 2.85V, TA= -40°C to +85°C, ENA = 2.0V. fRF = 450MHz to 2.5GHz. Typical values are at VCC = 2.85V,
TA=+25°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RF Input Frequency 450 2500 MHz
TA = +25°C, RFIN at 836MHz 3.3 4.8 6.3
RF Input Level for 2.0V TA = +25°C, RFIN at 1880MHz 1.9 3.4 4.9 dBm
Minimum Input Level -16dBm to -15dBm change in PIN
(836MHz to 2500MHz) 814 mV
PIN for 2.0V output ±0.5 ±1.1
Power Detector Accuracy Due to
Temperature
VCC = 2.85V,
836MHz to 1880MHz
TA = -40°C to +85°C
(Note 2) PIN for 0.1V output ±1.5 ±4
dB
824MHz to 849MHz 0.1
In-Band Variation 1850MHz to 1980MHz 0.2 dB
Note: This part is not for automotive applications.
CAUTION! ESD SENSITIVE DEVICE
MAX2204
RF Power Detector
_______________________________________________________________________________________
3
OUTPUT VOLTAGE vs. INPUT POWER
PIN (dBm)
VOUT (V)
MAX2204 toc01
-20 -15 -10 -5 0 5 10
0
0.5
1.0
1.5
2.0
2.5
f = 836MHz
VCC = 2.7V, 3.0V, 3.3V
OUTPUT VOLTAGE vs. INPUT POWER
PIN (dBm)
VOUT (V)
MAX2204 toc02
-20 -15 -10 -5 0 5 10
0
0.5
1.0
1.5
2.0
2.5
3.0
f = 1950MHz
VCC = 2.7V, 3.0V, 3.3V
DETECTOR ERROR FROM
TA = +25°C AT 450MHz
PIN (dBm)
ERROR (dB)
MAX2204 toc03
-20 -15 -10 -5 0 5 10
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
TA = -40°C
TA = +85°C
f = 450MHz
DETECTOR ERROR FROM
TA = +25°C AT 824MHz
PIN (dBm)
ERROR (dB)
MAX2204 toc04
-20 -15 -10 -5 0 5 10
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
f = 824MHz
TA = +85°C
TA = -40°C
DETECTOR ERROR FROM
TA = +25°C AT 849MHz
PIN (dBm)
ERROR (dB)
MAX2204 toc05
-20 -15 -10 -5 0 5 10
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
f = 849MHz TA = -40˚C
TA = +85˚C
DETECTOR ERROR FROM
TA = +25°C AT 1850MHz
PIN (dBm)
ERROR (dB)
MAX2204 toc06
-20 -15 -10 -5 0 5 10
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
f = 1850MHz
TA = +85°C
TA = -40°C
DETECTOR ERROR FROM
TA = +25°C AT 1910MHz
PIN (dBm)
ERROR (dB)
MAX2204 toc07
-20 -15 -10 -5 0 5 10
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
f = 1910MHz
TA = +85°C
TA = -40°C
DETECTOR ERROR FROM
TA = +25°C AT 2500MHz
PIN (dBm)
ERROR (dB)
MAX2204 toc08
-20 -15 -10 -5 0 5 10
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
f = 2500MHz
TA = -40°C
TA = +85°C
Typical Operating Characteristics
(MAX2204 Evaluation Kit, typical values are at VCC = 2.85V, ENA = 2.0V, TA= +25°C, modulation equals CW, unless otherwise noted.)
MAX2204
RF Power Detector
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(MAX2204 Evaluation Kit, typical values are at VCC = 2.85V, ENA = 2.0V, TA= +25°C, modulation equals CW, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT POWER
AT 836MHz WITH RESISTIVE TAP
PIN (dBm)
VOUT (V)
MAX2204 toc09
0 5 10 15 20 25 30
0
0.5
1.0
1.5
2.0
2.5
f = 836MHz
R = 3k
OUTPUT VOLTAGE vs. INPUT POWER
AT 1880MHz WITH RESISTIVE TAP
PIN (dBm)
VOUT (V)
MAX2204 toc10
0 5 10 15 20 25 30
0
0.5
1.0
1.5
2.0
2.5
f = 1880MHz
R = 1.5k
200µs/div
RESPONSE TIME
MAX2204 toc11
VOUT
200mV/div
ENA
1V/div
DEVIATION FROM DPCCH+1DPDCH, 1950MHz
PIN (dBm)
DEVIATION (dB)
MAX2204 toc12
-25 -20 -15 -10 -5 0 5 10
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
DPCCH+5DPDCH
DPCCH+4DPDCH
DPCCH+3DPDCH
DPCCH+2DPDCH
f = 1950MHz
OUTPUT VOLTAGE vs. INPUT POWER
WITH WCDMA DOWNLINK
PIN (dBm)
VOUT (V)
MAX2204 toc13
-20 -15 -10 -5 0 5 10
0
0.5
1.0
1.5
2.0
2.5
1 DPCH
PCPCH + SCH
3 DPCH,
PCPCH + SCH + 1DPCH,
PCPCH + SCH + 3DPCH
f = 2140MHz
MAX2204
RF Power Detector
_______________________________________________________________________________________ 5
Pin Description
PIN NAME FUNCTION
1V
CC
Power-Supply Pin. Bypass to GND with a capacitor as close as possible to the pin.
2 GND Ground Connection. Use multiple ground vias to connect the GND pin to the ground plane.
3 RFIN RF Input. AC-couple with an external capacitor.
4 ENA Enable Input. Drive low to turn the part off. Drive high or connect to V
CC
to turn the part on.
5 OUT Power Detector Output. Filter with a capacitor to GND.
Detailed Description
The MAX2204 RF power detector is designed to operate
from 450MHz to 2.5GHz. The device accepts an RF
signal at the input and outputs a highly repeatable volt-
age, which increases monotonically with increasing
input power. See the
Typical Operating Characteristics
.
The device is designed to compensate for temperature
and process shifts, reducing the typical output variation
to less than ±0.5dB at full input power and ±1.5dB at
the lower power.
The MAX2204 features a detection range from -16dBm
to +5dBm. High input impedance allows a for low-loss
resistive tap if an isolator is used. The device uses
external termination at the input so that the RF signal
from several directional couplers can be connected to
a single detector chip.
The MAX2204 features an enable input (ENA) that
allows the device to be put in shutdown. For normal
operation, drive ENA high or connect to VCC. For
device shutdown, drive ENA low.
The MAX2204 integrates an output series resistor of
approximately 100k. For output filtering, connect only
a capacitor to ground at the output.
Applications Information
The MAX2204 uses external termination when using
directional couplers. See Figure 1 for the typical appli-
cation circuit. The output of the detector is typically
connected to an ADC in cdma2000 or WCDMA power-
control topology.
PEAK
DETECT BUFFER
PA 1
PA 1
PA 2
COUPLER 1
COUPLER 1
COUPLER 2
BIAS
DETECTOR
OUTPUT
10
10
50
50
50
50
ENABLE
ENABLE
PEAK
DETECT BUFFER
BIAS
DETECTOR
OUTPUT
MAX2204 MAX2204
APPLICATION DIAGRAM FOR ONE PA
APPLICATION DIAGRAM FOR TWO PAs
Figure 1. Typical Application Circuit
MAX2204
The MAX2204 has high input impedance to allow
for high-value resistive tapping from a power amplifier.
This coupling method is the lowest cost and lowest
power loss when used with an isolator. See Figure 2 for
the typical application circuit.
The MAX2204 input impedance over frequency is listed
in Table 1.
Layout
The MAX2204 is not particularly sensitive to the layout,
since it only needs 5dBm for maximum output voltage.
However, there are two areas that need attention: the
GND pin and the supply bypassing. The GND pin should
be connected to the PCB ground with a GND via as
close as possible, and the supply bypass capacitor
should be close to the part.
RF Power Detector
6 _______________________________________________________________________________________
Table 1. MAX2204 Input Impedance Over Frequency
PIN = -16dBm PIN = +5dBm
FREQUENCY (GHz) REAL () IMAG (j) REAL () IMAG (j)
0.4 109.3 -556.5 120.0 -563.3
0.6 80.5 -369.0 91.0 -379.3
0.8 73.4 -300.3 80.8 -310.7
1.0 64.1 -260.2 75.6 -275.8
1.2 65.8 -216.4 79.9 -231.3
1.4 62.3 -194.9 64.4 -202.8
1.6 48.9 -177.5 53.9 -192.3
1.8 33.1 -157.4 39.9 -174.6
2.0 21.8 -142.2 25.9 -158.3
2.2 15.2 -131.2 18.3 -144.5
2.4 10.6 -116.8 10.6 -131.9
2.6 11.8 -99.8 10.6 -115.6
TO ANT
PA
OUTPUT
TO ADC
ISOLATOR
CFILTER
PEAK
DETECT BUFFER
BIAS
ENABLE
MAX2204
Figure 2. Typical Application Circuit Using Resistive Tapping
from a Power Amplifier
MAX2204
RF Power Detector
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 _____________________
7
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
PACKAGE OUTLINE, 5L SC70
21-0076
1
1
E