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| 19-0753; Rev 0; 4/07 KIT ATION EVALU BLE AVAILA RF Power Detector General Description Features o -16dBm to +5dBm Detection Range o 0.3dB Detection Error Due to Temperature o +2.7V to +3.3V Single-Supply Operation o Easy-to-Assemble, Lead-Free, 5-Pin SC70 Package MAX2204 The MAX2204 RF power detector is designed to operate from 450MHz to 2.5GHz. The device is ideal for wideband code-division multiple access (WCDMA), cdma2000(R), and high-speed downlink/uplink packet access. The MAX2204 accepts an RF signal at the input, and outputs a highly repeatable voltage. The output 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 package. Electrical performance is guaranteed over a -40C to +85C temperature range. Ordering Information PART TEMP RANGE PINPACKAGE 5 SC70 PKG CODE X5+1 Applications WCDMA, cdma2000 High-Speed Downlink Packet Access (HSDPA) High-Speed Uplink Packet Access (HSUPA) MAX2204EXK+ -40C to +85C +Denotes a lead-free package. Pin Configuration TOP VIEW cdma2000 is a registered trademark of Telecommunications Industry Association. + VCC 1 5 OUT GND 2 MAX2204 4 ENA RFIN 3 ________________________________________________________________ Maxim Integrated Products 1 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. RF Power Detector MAX2204 ABSOLUTE MAXIMUM RATINGS 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 = +70C) (derate 3.1mW/C above +70C) ................................247mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C JC ...............................................................................+115C/W JA ...............................................................................+324C/W Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s) .................................+300C 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 Note: This part is not for automotive applications. DC ELECTRICAL CHARACTERISTICS (VCC = 2.7V to 3.3V, TA = -40C to +85C, ENA = 2.0V, no RF signal applied. Typical values are at VCC = 2.85V, TA = +25C, unless otherwise noted.) (Note 1) PARAMETER Supply Voltage Operating Supply Current Sleep Mode Supply Current ENA Logic-High Threshold ENA Logic-Low Threshold ENA Input Current VIH VIL ENA = 2V ENA = 0.6V -2 -2 SYMBOL VCC ICC ENA = 0V 2 0.6 +10 +1 CONDITIONS MIN 2.7 1.2 0.5 TYP MAX 3.3 2.5 10 UNITS V mA A V V A AC ELECTRICAL CHARACTERISTICS (MAX2204 Evaluation Kit, VCC = 2.85V, TA = -40C to +85C, ENA = 2.0V. fRF = 450MHz to 2.5GHz. Typical values are at VCC = 2.85V, TA =+25C, unless otherwise noted.) (Note 1) PARAMETER RF Input Frequency RF Input Level for 2.0V Minimum Input Level TA = +25C, RFIN at 836MHz TA = +25C, RFIN at 1880MHz -16dBm to -15dBm change in PIN (836MHz to 2500MHz) VCC = 2.85V, 836MHz to 1880MHz TA = -40C to +85C (Note 2) 824MHz to 849MHz 1850MHz to 1980MHz PIN for 2.0V output PIN for 0.1V output SYMBOL CONDITIONS MIN 450 3.3 1.9 8 4.8 3.4 14 0.5 1.5 0.1 0.2 1.1 dB 4 dB TYP MAX 2500 6.3 4.9 UNITS MHz dBm mV Power Detector Accuracy Due to Temperature In-Band Variation Note 1: Specifications over TA = -40C to +85C are guaranteed by design. Production tests are performed at TA = +25C. Note 2: Guaranteed by design and characterization. 2 _______________________________________________________________________________________ RF Power Detector Typical Operating Characteristics (MAX2204 Evaluation Kit, typical values are at VCC = 2.85V, ENA = 2.0V, TA = +25C, modulation equals CW, unless otherwise noted.) DETECTOR ERROR FROM TA = +25C AT 450MHz MAX2204 toc02 MAX2204 OUTPUT VOLTAGE vs. INPUT POWER MAX2204 toc01 OUTPUT VOLTAGE vs. INPUT POWER 3.0 f = 1950MHz 2.5 2.0 VOUT (V) 1.5 1.0 VCC = 2.7V, 3.0V, 3.3V ERROR (dB) 1.5 f = 836MHz 2.0 VCC = 2.7V, 3.0V, 3.3V VOUT (V) 1.5 f = 450MHz 1.0 0.5 0 -0.5 -1.0 -1.5 TA = +85C TA = -40C 1.0 0.5 0.5 0 -20 -15 -10 -5 PIN (dBm) 0 5 10 -20 -15 -10 -5 PIN (dBm) 0 5 10 0 -20 -15 -10 -5 PIN (dBm) 0 5 10 DETECTOR ERROR FROM TA = +25C AT 824MHz MAX2204 toc04 DETECTOR ERROR FROM TA = +25C AT 849MHz MAX2204 toc05 DETECTOR ERROR FROM TA = +25C AT 1850MHz f = 1850MHz 1.0 0.5 ERROR (dB) 0 -0.5 TA = -40C MAX2204 toc06 1.5 f = 824MHz 1.0 0.5 ERROR (dB) TA = -40C 1.5 f = 849MHz 1.0 0.5 ERROR (dB) 0 -0.5 TA = -40C 1.5 0 -0.5 -1.0 -1.5 -20 -15 -10 -5 PIN (dBm) 0 5 10 TA = +85C -1.0 -1.5 -20 -15 -10 TA = +85C -1.0 -1.5 TA = +85C -5 PIN (dBm) 0 5 10 -20 -15 -10 -5 PIN (dBm) 0 5 10 DETECTOR ERROR FROM TA = +25C AT 1910MHz f = 1910MHz 1.0 0.5 ERROR (dB) ERROR (dB) 0 -0.5 -1.0 -1.5 -20 -15 -10 -5 PIN (dBm) 0 5 10 TA = +85C TA = -40C MAX2204 toc07 DETECTOR ERROR FROM TA = +25C AT 2500MHz TA = -40C 1.0 0.5 0 -0.5 -1.0 f = 2500MHz -1.5 -20 -15 -10 -5 PIN (dBm) 0 5 10 TA = +85C MAX2204 toc08 1.5 1.5 _______________________________________________________________________________________ MAX2204 toc03 2.5 3 RF Power Detector MAX2204 Typical Operating Characteristics (continued) (MAX2204 Evaluation Kit, typical values are at VCC = 2.85V, ENA = 2.0V, TA = +25C, modulation equals CW, unless otherwise noted.) OUTPUT VOLTAGE vs. INPUT POWER AT 836MHz WITH RESISTIVE TAP MAX2204 toc09 OUTPUT VOLTAGE vs. INPUT POWER AT 1880MHz WITH RESISTIVE TAP f = 1880MHz R = 1.5k 2.0 MAX2204 toc10 2.5 f = 836MHz R = 3k 2.0 2.5 VOUT (V) 1.0 VOUT (V) 0 5 10 15 20 PIN (dBm) 25 30 1.5 1.5 1.0 0.5 0.5 0 0 0 5 10 15 20 PIN (dBm) 25 30 RESPONSE TIME MAX2204 toc11 DEVIATION FROM DPCCH+1DPDCH, 1950MHz f = 1950MHz 0.4 0.2 0 -0.2 -0.4 DPCCH+5DPDCH -0.6 DPCCH+4DPDCH DPCCH+2DPDCH DPCCH+3DPDCH MAX2204 toc12 ENA 1V/div 0.6 VOUT 200mV/div 200s/div DEVIATION (dB) -25 -20 -15 -10 -5 PIN (dBm) 0 5 10 OUTPUT VOLTAGE vs. INPUT POWER WITH WCDMA DOWNLINK f = 2140MHz 2.0 1 DPCH PCPCH + SCH MAX2204 toc13 2.5 VOUT (V) 1.5 3 DPCH, PCPCH + SCH + 1DPCH, PCPCH + SCH + 3DPCH 1.0 0.5 0 -20 -15 -10 -5 PIN (dBm) 0 5 10 4 _______________________________________________________________________________________ RF Power Detector Pin Description PIN 1 2 3 4 5 NAME VCC GND RFIN ENA OUT FUNCTION Power-Supply Pin. Bypass to GND with a capacitor as close as possible to the pin. Ground Connection. Use multiple ground vias to connect the GND pin to the ground plane. RF Input. AC-couple with an external capacitor. Enable Input. Drive low to turn the part off. Drive high or connect to VCC to turn the part on. Power Detector Output. Filter with a capacitor to GND. MAX2204 PA 1 COUPLER 1 PA 1 COUPLER 1 50 10 PA 2 50 COUPLER 2 50 10 50 PEAK DETECT BUFFER DETECTOR OUTPUT PEAK DETECT BUFFER DETECTOR OUTPUT ENABLE BIAS ENABLE BIAS MAX2204 APPLICATION DIAGRAM FOR ONE PA MAX2204 APPLICATION DIAGRAM FOR TWO PAs Figure 1. Typical Application Circuit 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 voltage, 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 V CC . 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 application circuit. The output of the detector is typically connected to an ADC in cdma2000 or WCDMA powercontrol topology. _______________________________________________________________________________________ 5 RF Power Detector MAX2204 Table 1. MAX2204 Input Impedance Over Frequency FREQUENCY (GHz) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 PIN = -16dBm REAL () 109.3 80.5 73.4 64.1 65.8 62.3 48.9 33.1 21.8 15.2 10.6 11.8 IMAG (j) -556.5 -369.0 -300.3 -260.2 -216.4 -194.9 -177.5 -157.4 -142.2 -131.2 -116.8 -99.8 REAL () 120.0 91.0 80.8 75.6 79.9 64.4 53.9 39.9 25.9 18.3 10.6 10.6 PIN = +5dBm IMAG (j) -563.3 -379.3 -310.7 -275.8 -231.3 -202.8 -192.3 -174.6 -158.3 -144.5 -131.9 -115.6 Layout PA ISOLATOR TO ANT PEAK DETECT BUFFER OUTPUT TO ADC CFILTER 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. ENABLE BIAS MAX2204 Figure 2. Typical Application Circuit Using Resistive Tapping from a Power Amplifier 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. 6 _______________________________________________________________________________________ RF Power Detector 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.) MAX2204 PACKAGE OUTLINE, 5L SC70 21-0076 E 1 1 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) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. SC70, 5L.EPS |
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