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19-4982; Rev 0; 10/09
KIT ATION EVALU ABLE AVAIL
RMS Power Detector
General Description
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(R), 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 -40C to +85C extended temperature range. The device is available in a 6-bump WLP package. 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
Features
o -24dBm to +3dBm Power-Detection Range
MAX2203
Ordering Information
PART MAX2203EWT+T10 TEMP RANGE -40C to +85C PINPACKAGE 6 WLP TOP MARK AA
Applications
WCDMA, cdma2000, 1xEVDO High-Speed Downlink Packet Access (HSDPA) High-Speed Uplink Packet Access (HSUPA)
+Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel.
Pin Configuration
TOP VIEW (BUMPS ON BOTTOM)
1 + 2
Typical Operating Circuit appears at end of data sheet.
A
MAX2203
RFIN/ENA GND B GND C VCC OUT FILT
cdma2000 is a registered trademark of Telecommunications Industry Association.
________________________________________________________________ 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.
RMS Power Detector MAX2203
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 = +70C) 6-Bump WLP (derate 2.9mW/C above +70C)...........232mW Junction-to-Ambient Thermal Resistance (JA) (Note 1) ......................................................................347C/W Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +160C Junction Temperature .....................................................+150C 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 = -40C to +85C, VENA = 2.7V, no RF signal applied. Typical values are at VCC = 2.8V, TA = +25C, unless otherwise noted.) (Note 3)
PARAMETER Supply Voltage Supply Current Shutdown Supply Current ENA Logic-High Threshold ENA Logic-Low Threshold ENA Input Current VIH VIL VENA = 1.1V SYMBOL VCC ICC VCC = 2.8V, RF input = -24dBm to +3dBm VENA = 0V 1.1 0 25 CONDITIONS MIN 2.5 TYP 2.8 5 0.5 MAX 4.2 8 10 2.7 0.6 UNITS V mA A V V A
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.8V, TA = -40C to +85C, VENA = 2.7V, fRF = 800MHz to 2GHz, unless otherwise noted. Typical values are at TA = +25C.) (Note 3)
PARAMETER RF Input Frequency Maximum Output Voltage Minimum Output Voltage Minimum Input Power Level Log Slope Log Conformance Error with 10dB Step Power-Detector Accuracy Due to Temperature RFIN at +3dBm No RF input power +1dB input power step results in at least 25mV increase in VOUT (Note 4) [(VOUT at +3dBm) - (VOUT at -24dBm)]/27 (Notes 4, 5) RF input at -4dBm to 0dBm, TA = -40C to +85C, relative to +25C -24 25 -1.3 0.4 35 45 +1.3 SYMBOL CONDITIONS MIN 800 1.05 1.5 300 TYP MAX 2000 1.75 400 UNITS MHz V mV dBm mV/dB dB dB
Note 3: Guaranteed by production test at TA = +85C and 800MHz. Guaranteed by design and characterization at TA = -40C and TA = +25C, 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 = +25C.
2
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RMS Power Detector
Typical Operating Characteristics
(VCC = 2.7V, TA = +25C, WCDMA uplink DPCCH + 1DPDCH, log conformance calculation is referenced to a straight line that is calibrated at -20dBm and 0dBm, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT POWER
MAX2203 toc01
MAX2203
PCS WCDMA 1+1 vs. 1+5 RMS ERROR ( DEVIATION FROM MIDPOINT)
MAX2203 toc02
CELL WCDMA 1+1 vs. 1+5 RMS ERROR ( DEVIATION FROM MIDPOINT)
MAX2203 toc03
1.6 1.4 OUTPUT VOLTAGE (V) 1.2 1.0 0.8 2000MHz 0.6 0.4 0.2 -30 -25 -20 -15 -10 -5 0 5 INPUT POWER (dBm)
0.25
0.06 0.05 RMS ERROR (dB) 0.04 0.03 0.02 0.01 0
0.20 RMS ERROR (dB)
800MHz
0.15
0.10
0.05
0
-25 -21 -17 -13 -9 -5 -1 3 -23 -19 -15 -11 -7 -3 1 5 PIN (dBm)
-25 -21 -17 -13 -9 -5 -1 3 -23 -19 -15 -11 -7 -3 1 5 PIN (dBm)
LOG CONFORMANCE WITH 1dB STEP CELLULAR BAND
MAX2203 toc04
LOG CONFORMANCE WITH 1dB STEP PCS BAND
MAX2203 toc05
LOG CONFORMANCE WITH 10dB STEP CELLULAR BAND
MAX2203 toc06
0.3 0.2 LOG CONFORMANCE (dB) 0.1 0 -0.1 -0.2 -0.3 -25 -20 -15 -10 -5 0 INPUT POWER (dBm) MEAN - 3 x STDEV MEAN
0.3 0.2 LOG CONFORMANCE (dB) MEAN + 3 x STDEV 0.1 0 -0.1 -0.2 -0.3 -25 -20 -15 -10 -5 0 INPUT POWER (dBm) MEAN - 3 x STDEV MEAN
1.0
LOG CONFORMANCE (dB)
MEAN + 3 x STDEV
0.6 MEAN + 3 x STDEV MEAN
0.2
-0.2
-0.6 MEAN - 3 x STDEV -1.0 -15 -10 -5 0 INPUT POWER (dBm)
LOG CONFORMANCE WITH 10dB STEP PCS BAND
MAX2203 toc07
55-UNIT CELLULAR ROOM-COLD TEMPERATURE ERROR
MAX2203 toc08
1.0
0.8 0.6 TEMPERATURE ERROR (dB) 0.4 0.2 0 -0.2
LOG CONFORMANCE (dB)
0.6 MEAN + 3 x STDEV 0.2
-0.2
MEAN
-0.6 MEAN - 3 x STDEV -1.0 -15 -10 -5 0 INPUT POWER (dBm)
-0.4
-25 -21 -17 -13 -9 -5 -1 3 -23 -19 -15 -11 -7 -3 1 5 INPUT POWER (dBm)
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3
RMS Power Detector MAX2203
Typical Operating Characteristics (continued)
(VCC = 2.7V, TA = +25C, 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-COLD TEMPERATURE ERROR
MAX2203 toc09
55-UNIT PCS ROOM-HOT TEMPERATURE ERROR
MAX2203 toc10
55-UNIT CELLULAR ROOM-HOT TEMPERATURE ERROR
MAX2203 toc11
0.2 0 TEMPERATURE ERROR (dB) -0.2 -0.4 -0.6 -0.8 -1.0
1.4 1.2 TEMPERATURE ERROR (dB) 1.0 0.8 0.6 0.4 0.2
0.6 0.4
TEMPERATURE ERROR (dB) -25 -21 -17 -13 -9 -5 -1 3 -23 -19 -15 -11 -7 -3 1 5 INPUT POWER (dBm)
0.2
0
-0.2
-25 -21 -17 -13 -9 -5 -1 3 -23 -19 -15 -11 -7 -3 1 5 INPUT POWER (dBm)
0
-0.4
-25 -21 -17 -13 -9 -5 -1 3 -23 -19 -15 -11 -7 -3 1 5 INPUT POWER (dBm)
OUTPUT VOLTAGE vs. FREQUENCY
+5dBm 0dBm -5dBm -10dBm -15dBm -20dBm -25dBm 0.2V/div 50 300 550 800 1050 1300 1550 1800 2050 2300 2550 2800 3050 3300 0 1.4 1.2 VOUT (V) 1.0 0.8 0.6 0.4 0.2
MAX2203 toc12
TURN-ON TIME
MAX2203 toc13
TURN-ON TIME
MAX2203 toc14
1.6
0.5V/div
0.5V/div
INPUT POWER = 0dBm, 800MHz
INPUT POWER = 0dBm, 2000MHz
0.2V/div 40s/div 40s/div
FREQUENCY (MHz)
TURN-ON TIME
MAX2203 toc15
TURN-ON TIME
MAX2203 toc16
0.5V/div
0.5V/div
INPUT POWER = -25dBm, 800MHz
INPUT POWER = -25dBm, 2000MHz
50mV/div 40s/div
50mV/div 40s/div
4
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RMS Power Detector
Pin Description
BUMP A1 A2, B1 B2 C1 C2 NAME RFIN/ENA GND FILT VCC OUT 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. Ground. Connect to PCB ground plane. Intermediate Filtering Node. Bypass FILT with a capacitor as close as possible to the device. Power Supply. Connect to either a regulated supply or battery. Bypass VCC with a capacitor as close as possible to the device. Detector Output. Connect an external lowpass RC filter for filtering.
MAX2203
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 DPCCH + 5DPDCH IS95 Reverse IS95 Forward Pilot 9-Channel Forward cdma2000 Pilot + DCCH PAR AT DIFFERENT PROBABILITY OF COMPLEMENTARY CUMULATIVE DISTRIBUTION (dB) 10% 4.8 6.5 5.5 5.6 7 6.8 1% 5.8 8.4 6.9 7.6 10.3 8.3 0.1% 6.2 9.2 7.6 8.8 12 9.2 0.01% 6.5 9.8 8.1 9.5 12.7 9.7
*PAR of CW is 3dB.
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5
RMS Power Detector MAX2203
PA 1 COUPLER 1
50
10 PA 2 COUPLER 2
10 50
RMS DETECT
BUFFER
DETECTOR OUTPUT
ENABLE
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.
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.
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 1k to avoid loading the RF input signal. There is an internal resistor to GND of approximately 50k. 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.
Chip Information
PROCESS: BiCMOS
6
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RMS Power Detector
Typical Operating Circuit
TERMINATION RESISTOR NOT NEEDED IF TWO OR MORE DIRECTIONAL COUPLERS ARE USED AND CONFIGURED AS IN FIGURE 1. + RF INPUT FROM DIRECTIONAL COUPLER 50 1% 220pF A1 RFIN/ ENA A2 GND
MAX2203
MAX2203
24.3k B1 GND VCC B2 FILT
ENABLE LOGIC INPUT
TYPE WCDMA NCDMA
C1 (F) 0.1 0.33
C2 (nF) 4.7 15
0.1F
C1 VCC
C2 OUT
C1 0.1F MUST BE X5R OR X7R TYPE 10k TO ADC C2 4700pF
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 6 WLP PACKAGE CODE W61B1+1 DOCUMENT NO. 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
(c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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