19-0753; Rev 0; 4/07 KIT ATION EVALU E L B AVAILA RF Power Detector 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®, 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 -40°C to +85°C temperature range. 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 Ordering Information PART Applications WCDMA, cdma2000 TEMP RANGE MAX2204EXK+ -40°C to +85°C +Denotes a lead-free package. PINPACKAGE PKG CODE 5 SC70 X5+1 High-Speed Downlink Packet Access (HSDPA) High-Speed Uplink Packet Access (HSUPA) Pin Configuration TOP VIEW cdma2000 is a registered trademark of Telecommunications Industry Association. + VCC 1 GND 2 RFIN 3 5 OUT 4 ENA MAX2204 ________________________________________________________________ Maxim Integrated Products 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. 1 MAX2204 General Description MAX2204 RF Power Detector 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 = +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 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 = -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) PARAMETER SYMBOL Supply Voltage VCC Operating Supply Current ICC Sleep Mode Supply Current CONDITIONS MIN VIH ENA Logic-Low Threshold VIL ENA Input Current MAX 3.3 V 1.2 2.5 mA 0.5 10 µA 0.6 V 2.7 ENA = 0V ENA Logic-High Threshold TYP 2 UNITS V ENA = 2V -2 +10 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 RF Input Frequency RF Input Level for 2.0V TYP 450 MAX UNITS 2500 MHz TA = +25°C, RFIN at 836MHz 3.3 4.8 6.3 TA = +25°C, RFIN at 1880MHz 1.9 3.4 4.9 8 14 Minimum Input Level -16dBm to -15dBm change in PIN (836MHz to 2500MHz) Power Detector Accuracy Due to Temperature VCC = 2.85V, 836MHz to 1880MHz TA = -40°C to +85°C (Note 2) In-Band Variation MIN mV PIN for 2.0V output ±0.5 ±1.1 PIN for 0.1V output ±1.5 ±4 dB 824MHz to 849MHz 0.1 1850MHz to 1980MHz 0.2 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. 2 dBm _______________________________________________________________________________________ dB RF Power Detector 1.0 0.5 1.5 -0.5 0.5 -1.0 -15 -10 -5 PIN (dBm) 0 5 -15 -5 PIN (dBm) 0 5 10 -20 f = 824MHz TA = -40°C f = 849MHz TA = -40˚C 1.0 TA = +85°C -1.0 0 -15 -10 -5 PIN (dBm) 0 5 TA = +85°C -10 -5 PIN (dBm) 0 5 10 -20 -15 -10 -5 PIN (dBm) 0 DETECTOR ERROR FROM TA = +25°C AT 2500MHz 1.5 MAX2204 toc07 1.5 f = 1910MHz TA = -40°C TA = -40°C 1.0 0.5 ERROR (dB) 0.5 ERROR (dB) 10 0 -1.5 -15 DETECTOR ERROR FROM TA = +25°C AT 1910MHz 1.0 5 TA = -40°C -1.0 TA = +85˚C -20 10 10 -0.5 -1.5 -20 5 0.5 -1.0 -1.5 0 f = 1850MHz -0.5 -0.5 -5 PIN (dBm) 1.0 ERROR (dB) ERROR (dB) 0 -10 1.5 0.5 0.5 -15 DETECTOR ERROR FROM TA = +25°C AT 1850MHz 1.5 MAX2204 toc04 1.5 ERROR (dB) -10 DETECTOR ERROR FROM TA = +25°C AT 849MHz DETECTOR ERROR FROM TA = +25°C AT 824MHz 1.0 TA = +85°C -1.5 -20 10 MAX2204 toc05 -20 0 1.0 0 0 TA = -40°C 0.5 ERROR (dB) VOUT (V) VOUT (V) 1.5 f = 450MHz 1.0 VCC = 2.7V, 3.0V, 3.3V 2.0 MAX2204 toc03 2.5 VCC = 2.7V, 3.0V, 3.3V 1.5 MAX2204 toc06 2.0 f = 1950MHz MAX2204 toc08 f = 836MHz MAX2204 toc02 3.0 MAX2204 toc01 2.5 DETECTOR ERROR FROM TA = +25°C AT 450MHz OUTPUT VOLTAGE vs. INPUT POWER OUTPUT VOLTAGE vs. INPUT POWER 0 0 -0.5 -0.5 TA = +85°C -1.0 TA = +85°C -1.0 f = 2500MHz -1.5 -1.5 -20 -15 -10 -5 PIN (dBm) 0 5 10 -20 -15 -10 -5 PIN (dBm) 0 5 10 _______________________________________________________________________________________ 3 MAX2204 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.) 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 OUTPUT VOLTAGE vs. INPUT POWER AT 1880MHz WITH RESISTIVE TAP f = 836MHz R = 3kΩ 2.0 MAX2204 toc10 2.5 MAX2204 toc09 2.5 f = 1880MHz R = 1.5kΩ 2.0 1.5 VOUT (V) 1.0 0.5 1.5 1.0 0.5 0 0 0 5 10 15 20 PIN (dBm) 25 30 0 RESPONSE TIME 5 10 15 20 PIN (dBm) 25 30 DEVIATION FROM DPCCH+1DPDCH, 1950MHz MAX2204 toc11 0.6 ENA 1V/div f = 1950MHz DEVIATION (dB) 0.4 VOUT 200mV/div DPCCH+4DPDCH MAX2204 toc12 VOUT (V) DPCCH+2DPDCH 0.2 DPCCH+3DPDCH 0 -0.2 -0.4 DPCCH+5DPDCH -0.6 200µs/div -25 -20 -15 -10 -5 PIN (dBm) 0 5 OUTPUT VOLTAGE vs. INPUT POWER WITH WCDMA DOWNLINK f = 2140MHz 2.0 MAX2204 toc13 2.5 VOUT (V) MAX2204 RF Power Detector 1 DPCH PCPCH + SCH 3 DPCH, PCPCH + SCH + 1DPCH, PCPCH + SCH + 3DPCH 1.5 1.0 0.5 0 -20 4 -15 -10 -5 PIN (dBm) 0 5 10 _______________________________________________________________________________________ 10 RF Power Detector PIN NAME FUNCTION 1 VCC 2 GND 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. 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 VCC to turn the part on. 5 OUT Power Detector Output. Filter with a capacitor to GND. PA 1 COUPLER 1 PA 1 COUPLER 1 10Ω 50Ω PA 2 COUPLER 2 50Ω 50Ω 10Ω 50Ω PEAK DETECT ENABLE BUFFER DETECTOR OUTPUT PEAK DETECT BUFFER DETECTOR OUTPUT BIAS ENABLE MAX2204 BIAS MAX2204 APPLICATION DIAGRAM FOR ONE PA 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 100kΩ. 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 MAX2204 Pin Description MAX2204 RF Power Detector Table 1. MAX2204 Input Impedance Over Frequency PIN = -16dBm FREQUENCY (GHz) PIN = +5dBm REAL (Ω) IMAG (jΩ) REAL (Ω) IMAG (jΩ) 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 Layout PA ISOLATOR PEAK DETECT TO ANT BUFFER OUTPUT TO ADC 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. CFILTER 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 SC70, 5L.EPS 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 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX2204 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.)