19-4982; Rev 0; 10/09
KIT
ATION
EVALU
E
L
B
A
AVAIL
RMS Power Detector
The MAX2203 RMS power detector is designed to
operate from 800MHz to 2.0GHz. The device is ideal for
wideband code-division multiple access (WCDMA),
cdma2000®, and high-speed downlink/uplink packet
access. The MAX2203 accepts an RF signal at the
input and outputs the same voltage regardless of the
peak-average of the input signal. The output voltage
and input power is linear in dB. The device has a
-24dBm to +3dBm detection range, and every dB
change in input power gives 35mV (typ) change in output voltage.
The MAX2203 operates from a 2.5V to 4.2V supply and
is specified over the -40°C to +85°C extended temperature range. The device is available in a 6-bump WLP
package.
Applications
WCDMA, cdma2000, 1xEVDO
Features
o -24dBm to +3dBm Power-Detection Range
o 35mV/dB (typ) Log Detector
o 0.1dB (typ) RMS Accuracy from WCDMA
Modulation Change
o ±0.4dB Detection Error Due to Temperature
o +2.5V to +4.2V Single-Supply Operation
o Space-Saving 6-Bump WLP Package
Ordering Information
PART
TEMP RANGE
PINPACKAGE
TOP
MARK
MAX2203EWT+T10
-40°C to +85°C
6 WLP
AA
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
High-Speed Downlink Packet Access (HSDPA)
Pin Configuration
High-Speed Uplink Packet Access (HSUPA)
TOP VIEW
(BUMPS ON BOTTOM)
1
2
+
Typical Operating Circuit appears at end of data sheet.
MAX2203
A
RFIN/ENA GND
B
GND
FILT
VCC
OUT
C
cdma2000 is a registered trademark of Telecommunications
Industry Association.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX2203
General Description
MAX2203
RMS Power Detector
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +4.5V
ENA, OUT, FILT to GND ........................................-0.3V to +3.0V
RFIN Input Power ...........................................................+10dBm
Continuous Power Dissipation (TA = +70°C)
6-Bump WLP (derate 2.9mW/°C above +70°C)...........232mW
Junction-to-Ambient Thermal Resistance (θJA)
(Note 1) ......................................................................347°C/W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Junction Temperature .....................................................+150°C
Lead Temperature (soldering, 10s)..........Reflow Profile (Note 2)
Note 1: Package thermal resistances were obtained using the method described in JEDEC specifications. For detailed information
on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Note 2: 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 = 2.5V to 4.2V, TA = -40°C to +85°C, VENA = 2.7V, no RF signal applied. Typical values are at VCC = 2.8V, TA = +25°C, unless
otherwise noted.) (Note 3)
PARAMETER
SYMBOL
Supply Voltage
VCC
Supply Current
ICC
Shutdown Supply Current
CONDITIONS
MIN
TYP
MAX
2.5
2.8
4.2
V
5
8
mA
10
µA
VCC = 2.8V, RF input = -24dBm to +3dBm
VENA = 0V
0.5
UNITS
ENA Logic-High Threshold
VIH
1.1
2.7
V
ENA Logic-Low Threshold
VIL
0
0.6
V
ENA Input Current
VENA = 1.1V
25
µA
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.8V, TA = -40°C to +85°C, VENA = 2.7V, fRF = 800MHz to 2GHz, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 3)
PARAMETER
SYMBOL
CONDITIONS
RF Input Frequency
MIN
TYP
MAX
UNITS
2000
MHz
1.5
1.75
V
300
400
mV
800
Maximum Output Voltage
RFIN at +3dBm
1.05
Minimum Output Voltage
No RF input power
Minimum Input Power Level
+1dB input power step results in at least
25mV increase in VOUT (Note 4)
-24
Log Slope
[(VOUT at +3dBm) - (VOUT at -24dBm)]/27
25
Log Conformance Error with
10dB Step
(Notes 4, 5)
Power-Detector Accuracy Due to
Temperature
RF input at -4dBm to 0dBm, TA = -40°C to
+85°C, relative to +25°C
dBm
35
-1.3
±0.4
45
mV/dB
+1.3
dB
dB
Note 3: Guaranteed by production test at TA = +85°C and 800MHz. Guaranteed by design and characterization at TA = -40°C and
TA = +25°C, and over frequency limits.
Note 4: Guaranteed by design and characterization.
Note 5: Input power -24dBm to +3dBm. Ideal straight line calibrated with input power -20dBm and 0dBm at TA = +25°C.
2
_______________________________________________________________________________________
RMS Power Detector
PCS WCDMA 1+1 vs. 1+5 RMS ERROR
(± DEVIATION FROM MIDPOINT)
800MHz
1.0
0.8
2000MHz
0.15
0.10
0.05
0.6
0.05
0
0.2
INPUT POWER (dBm)
LOG CONFORMANCE WITH 1dB STEP
CELLULAR BAND
LOG CONFORMANCE WITH
1dB STEP PCS BAND
-15
-10
-5
5
0
0.2
0.1
MEAN
0
-0.1
-0.2
0.2
LOG CONFORMANCE (dB)
MEAN + 3 x STDEV
MEAN + 3 x STDEV
0.1
0
MEAN
-0.1
-25 -21 -17 -13 -9 -5 -1
3
-23 -19 -15 -11 -7
-3
1
5
PIN (dBm)
1.0
0.6
MEAN + 3 x STDEV
0.2
MEAN
-0.2
-0.6
MEAN - 3 x STDEV
-0.2
MEAN - 3 x STDEV
0.02
LOG CONFORMANCE WITH
10dB STEP CELLULAR BAND
0.3
MAX2203 toc04
0.3
0.03
0
LOG CONFORMANCE (dB)
-20
MAX2203 toc05
-25
0.04
0.01
-25 -21 -17 -13 -9 -5 -1
3
-23 -19 -15 -11 -7
-3
1
5
PIN (dBm)
-30
MAX2203 toc03
MAX2203 toc02
0.20
0.4
MEAN - 3 x STDEV
-0.3
-15
-10
-5
0
-25
-20
INPUT POWER (dBm)
-15
-10
-5
INPUT POWER (dBm)
1.0
0.6
MEAN + 3 x STDEV
0.2
-0.2
0
-15
-10
-5
0
INPUT POWER (dBm)
55-UNIT CELLULAR ROOM-COLD
TEMPERATURE ERROR
LOG CONFORMANCE WITH
10dB STEP PCS BAND
0.8
0.6
TEMPERATURE ERROR (dB)
-20
MAX2203 toc07
-25
-1.0
MEAN
-0.6
MAX2203 toc08
-0.3
LOG CONFORMANCE (dB)
LOG CONFORMANCE (dB)
0.06
RMS ERROR (dB)
1.2
RMS ERROR (dB)
1.4
OUTPUT VOLTAGE (V)
0.25
MAX2203 toc01
1.6
CELL WCDMA 1+1 vs. 1+5 RMS ERROR
(± DEVIATION FROM MIDPOINT)
MAX2203 toc06
OUTPUT VOLTAGE vs. INPUT POWER
0.4
0.2
0
-0.2
MEAN - 3 x STDEV
-1.0
-0.4
-15
-10
-5
INPUT POWER (dBm)
0
-25 -21 -17 -13 -9 -5 -1
3
-23 -19 -15 -11 -7
-3
1
5
INPUT POWER (dBm)
_______________________________________________________________________________________
3
MAX2203
Typical Operating Characteristics
(VCC = 2.7V, TA = +25°C, WCDMA uplink DPCCH + 1DPDCH, log conformance calculation is referenced to a straight line that is
calibrated at -20dBm and 0dBm, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 2.7V, TA = +25°C, WCDMA uplink DPCCH + 1DPDCH, log conformance calculation is referenced to a straight line that is
calibrated at -20dBm and 0dBm, unless otherwise noted.)
55-UNIT PCS ROOM-HOT
TEMPERATURE ERROR
-0.2
-0.4
-0.6
-1.0
MAX2203 toc10
1.2
-0.8
1.0
0.8
0.6
0.4
0
-25 -21 -17 -13 -9 -5 -1
3
-23 -19 -15 -11 -7
-3
1
5
INPUT POWER (dBm)
1.2
0dBm
0
-0.4
-25 -21 -17 -13 -9 -5 -1
3
-23 -19 -15 -11 -7
-3
1
5
INPUT POWER (dBm)
TURN-ON TIME
MAX2203 toc14
MAX2203 toc13
MAX2203 toc12
1.4
+5dBm
0.2
TURN-ON TIME
OUTPUT VOLTAGE vs. FREQUENCY
1.6
0.4
-0.2
0.2
-25 -21 -17 -13 -9 -5 -1
3
-23 -19 -15 -11 -7
-3
1
5
INPUT POWER (dBm)
0.6
TEMPERATURE ERROR (dB)
TEMPERATURE ERROR (dB)
0
1.4
TEMPERATURE ERROR (dB)
MAX2203 toc09
0.2
55-UNIT CELLULAR ROOM-HOT
TEMPERATURE ERROR
MAX2203 toc11
55-UNIT PCS ROOM-COLD
TEMPERATURE ERROR
VOUT (V)
0.5V/div
0.5V/div
-5dBm
1.0
-10dBm
0.8
-15dBm
0.6
-20dBm
0.4
-25dBm
INPUT POWER = 0dBm, 2000MHz
INPUT POWER = 0dBm, 800MHz
0.2
0.2V/div
0.2V/div
0
50
300
550
800
1050
1300
1550
1800
2050
2300
2550
2800
3050
3300
MAX2203
RMS Power Detector
40µs/div
40µs/div
FREQUENCY (MHz)
TURN-ON TIME
TURN-ON TIME
MAX2203 toc16
MAX2203 toc15
0.5V/div
0.5V/div
INPUT POWER = -25dBm, 2000MHz
INPUT POWER = -25dBm, 800MHz
50mV/div
50mV/div
40µs/div
4
40µs/div
_______________________________________________________________________________________
RMS Power Detector
BUMP
NAME
FUNCTION
RF Input and Enable Logic Input. See the Typical Operating Circuit. Drive ENA high to turn on the
device. Drive ENA low to place it in shutdown mode.
A1
RFIN/ENA
A2, B1
GND
Ground. Connect to PCB ground plane.
B2
FILT
Intermediate Filtering Node. Bypass FILT with a capacitor as close as possible to the device.
C1
VCC
Power Supply. Connect to either a regulated supply or battery. Bypass VCC with a capacitor as close
as possible to the device.
C2
OUT
Detector Output. Connect an external lowpass RC filter for filtering.
Detailed Description
The MAX2203 RMS power detector is designed to
operate from 800MHz to 2.0GHz. The device is ideal for
WCDMA, cdma2000, and high-speed downlink/uplink
packet access. The MAX2203 accepts an RF signal at
the input and outputs the same voltage regardless of
the peak-average of the input signal. The output voltage and input power is linear in dB. The device has a
-24dBm to +3dBm detection range, and every dB
change in input power gives 35mV (typ) change in output voltage. Table 1 shows the peak to average of the
signals used to test the MAX2203.
Table 1. Peak-to-Average Ratio (PAR*) of Test Signals
MODULATION
DPCCH + 1DPDCH
PAR AT DIFFERENT PROBABILITY OF COMPLEMENTARY CUMULATIVE
DISTRIBUTION (dB)
10%
1%
0.1%
0.01%
4.8
5.8
6.2
6.5
DPCCH + 5DPDCH
6.5
8.4
9.2
9.8
IS95 Reverse
5.5
6.9
7.6
8.1
IS95 Forward Pilot
5.6
7.6
8.8
9.5
7
10.3
12
12.7
6.8
8.3
9.2
9.7
9-Channel Forward
cdma2000 Pilot + DCCH
*PAR of CW is 3dB.
_______________________________________________________________________________________
5
MAX2203
Pin Description
MAX2203
RMS Power Detector
PA 1
COUPLER 1
10Ω
50Ω
PA 2
COUPLER 2
10Ω
50Ω
RMS
DETECT
ENABLE
BUFFER
DETECTOR
OUTPUT
BIAS
MAX2203
Figure 1. System Level Connection
Applications Information
The MAX2203 uses external termination when using
directional couplers. Figure 1 shows the system level
connection of dual-band power detection. The output of
the detector is typically connected to an ADC in
cdma2000 or WCDMA power-control topology.
Enable Logic Level
The MAX2203 features an enable input (ENA) that
allows the device to be put into shutdown. For normal
operation, drive ENA high. For device shutdown, drive
ENA low. The ENA pin is DC biased through a resistor.
The value of the resistor is recommended to be greater
than 1kΩ to avoid loading the RF input signal. There is
an internal resistor to GND of approximately 50kΩ. If
the control source high voltage is greater than 2.8V,
calculate and use a resistor value that ensures the ENA
pin only sees a maximum of 2.7V, which is within specification. In this manner, the MAX2203 can be driven
from a control device with a logic-high greater than
2.8V.
6
Layout
The MAX2203 is not particularly sensitive to the layout
since it only needs 3dBm for maximum output voltage.
However, there are two areas that need attention: the
GND pins and the supply bypassing. Connect the GND
pins to the PCB ground with a ground via as close as
possible, and bypass VCC to ground with a capacitor
as close as possible to the part.
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________
RMS Power Detector
TERMINATION RESISTOR NOT NEEDED
IF TWO OR MORE DIRECTIONAL COUPLERS
ARE USED AND CONFIGURED AS IN FIGURE 1.
MAX2203
+
220pF
RF INPUT FROM
DIRECTIONAL
COUPLER
50Ω
1%
A1
RFIN/
ENA
A2
GND
B1
GND
B2
FILT
C1
VCC
C2
OUT
24.3kΩ
ENABLE
LOGIC INPUT
VCC
TYPE
C1 (µF)
C2 (nF)
WCDMA
0.1
4.7
NCDMA
0.33
15
0.1µF
C1
0.1µF
MUST BE X5R
OR X7R TYPE
10kΩ
TO ADC
C2
4700pF
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
6 WLP
W61B1+1
21-0217
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
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX2203
Typical Operating Circuit
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