19-1912; Rev 3; 11/03 KIT ATION EVALU E L B A IL AVA 2.4GHz to 2.5GHz Linear Power Amplifier ________________________Applications Features ♦ 2.4GHz to 2.5GHz Operating Range ♦ +22.5dBm Linear Output Power (ACPR of <-33dBc 1st-Side Lobe and <-55dbc 2nd-Side Lobe) ♦ 28.5dB Power Gain ♦ On-Chip Power Detector ♦ External Bias Control for Current Throttleback ♦ +2.7V to +3.6V Single-Supply Operation ♦ 0.5µA Shutdown Mode ♦ Tiny Chip-Scale Package (1.5mm ✕ 2.0mm) Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK MAX2242EBC-T -40°C to +85°C 3 ✕ 4 UCSP AAE Pin Configuration RF_IN GND VCC1 C4 B4 A4 IEEE 802.11b DSSS Radios Wireless LANs HomeRF 2.4GHz Cordless Phones GND 2.4GHz ISM Radios C3 VCCB BIAS CIRCUIT A3 PD_OUT SHDN C2 B2 VCC2 A2 Actual Size DET 1.5mm ✕ 2.0mm Typical Application Circuit appears at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. C1 B1 A1 BIAS RF_OUT GND 3✕4 UCSP ________________________________________________________________ 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 MAX2242 General Description The MAX2242 low-voltage linear power amplifier (PA) is designed for 2.4GHz ISM-band wireless LAN applications. It delivers +22.5dBm of linear output power with an adjacent-channel power ratio (ACPR) of <-33dBc 1st-side lobe and <-55dBc 2nd-side lobe, compliant with the IEEE 802.11b 11MB/s WLAN standard with at least 3dB margin. The PA is packaged in the tiny 3x4 chip-scale package (UCSP™), measuring only 1.5mm x 2.0mm, ideal for radios built in small PC card and compact flash card form factors. The MAX2242 PA consists of a three-stage PA, power detector, and power management circuitry. The power detector provides over 20dB of dynamic range with ±0.8dB accuracy at the highest output power level. An accurate automatic level control (ALC) function can be easily implemented using this detector circuit. The PA also features an external bias control pin. Through the use of an external DAC, the current can be throttled back at lower output power levels while maintaining sufficient ACPR performance. As a result, the highest possible efficiency is maintained at all power levels. The device operates over a single +2.7V to +3.6V power-supply range. An on-chip shutdown feature reduces operating current to 0.5µA, eliminating the need for an external supply switch. MAX2242 2.4GHz to 2.5GHz Linear Power Amplifier ABSOLUTE MAXIMUM RATINGS VCC1, VCC2 to GND (no RF signal applied) ..........-0.3V to +5.5V RF Input Power ...............................................................+10dBm SHDN, BIAS, PD_OUT, RF_OUT ................-0.3V to (VCC + 0.3V) DC Input Current at RF_IN Port.............................-1mA to +1mA Maximum VSWR Without Damage ........................................10:1 Maximum VSWR for Stable Operation.....................................5:1 Continuous Power Dissipation (TA = +85°C) 3✕4 UCSP (derate 80mW/°C above +85°C) ..................1.6W Operating Temperature Range ...........................-40°C to +85°C Thermal Resistance .........................................................25°C/W Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +125°C Lead Temperature (soldering, 10s) .................................+260°C Continuous Operating Lifetime.....................10yrs × 0.92(TA - 60°C) (For Operating Temperature, TA ≥ +60°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 DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +3.6V, fIN = 2.4GHz to 2.5GHz, V SHDN = VCC, RF_IN = RF_OUT = connected to 50Ω load, TA = -40°C to +85°C. Typical values are measured at VCC = +3.3V, fIN = 2.45GHz, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS Supply Voltage Supply Current (Notes 2, 3, 6) Shutdown Supply Current Logic Input Voltage High MIN TYP 2.7 POUT = +22dBm, VCC = +3.3V, idle current = 280mA 300 POUT = +13dBm, idle current = 55mA 90 POUT = +5dBm, idle current = 25mA 50 V SHDN = 0, no RF input 0.5 UNITS 3.6 V 335 mA 10 2.0 Logic Input Voltage Low 2 MAX µA V 0.8 V Logic Input Current High -1 5 µA Logic Input Current Low -1 1 µA _______________________________________________________________________________________ 2.4GHz to 2.5GHz Linear Power Amplifier (MAX2242 Evaluation Kit, VCC = +3.3V, V SHDN = VCC, 50Ω source and load impedance, fIN = 2.45GHz, TA = +25°C, unless otherwise noted.) (Note 6) PARAMETER CONDITIONS Frequency Range (Notes 3, 4) Power Gain (Notes 1, 3) MIN TYP 2.4 TA = +25°C 26.5 TA = -40°C to +85°C 25.5 MAX UNITS 2.5 GHz 28.5 dB Gain Variation Over Temperature (Note 3) TA = -40°C to +85°C ±1.2 dB Gain Variation Over VCC (±10%) (Note 3) VCC = +3.0V to +3.6V ±0.3 dB Output Power (Notes 3, 5, 8) ACPR, 1st-side lobe < -33dBc, 2nd-side lobe < -55dBc 22.5 dBm Saturated Output Power PIN = +5dBm 26.5 dBm -40 dBc Input VSWR Over full PIN range 1.5:1 Output VSWR Over full POUT range 2.5:1 Power Ramp Turn-On Time (Note 7) SHDN from low to high 1 1.5 µs Power Ramp Turn-Off Time (Note 7) SHDN from high to low 1 1.5 µs 2.5 5 µs Harmonic Output (2f, 3f, 4f) RF Output Detector Response TIme Po = +22dBm (Note 9) RF Output Detector Voltage Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: 21.5 1.8 Po = +13dBm (Note 9) 0.9 Po = +5dBm (Note 9) 0.55 V Specifications over TA = -40°C to +85°C are guaranteed by design. Production tests are performed at TA = +25°C. Idle current is controlled by external DAC for best efficiency over the entire output power range. Parameter measured with RF modulation based on IEEE 802.11b standard. Power gain is guaranteed over this frequency range. Operation outside this range is possible, but is not guaranteed. Output two-tone third-order intercept point (OIP3) is production tested at TA = +25°C. The OIP3 is tested with two signals at f1 = 2.450GHz and f2 = 2.451GHz with fixed PIN. Min/max limits are guaranteed by design and characterization. The total turn-on and turn-off times required for PA output power to settle to within 0.5dB of the final value. Excludes PC board loss of approximately 0.15dB. See Typical Operating Characteristics for statistical variation. _______________________________________________________________________________________ 3 MAX2242 AC ELECTRICAL CHARACTERISTICS Typical Operating Characteristics (VCC = +3.3V, fIN = 2.45MHz, RF modulation = IEEE 802.11b, V SHDN = VCC, TA = +25°C, unless otherwise noted.) PO = +22dBm 320 28 280 TA = -40°C 260 TA = +25°C TA = +85°C TA = +85°C 27 240 IDLE CURRENT SET TO 280mA AT VCC = +3.3V, TA = +25°C 26 220 3.3 3.6 2.7 3.0 SUPPLY VOLTAGE (V) 300 IDLE CURRENT ADJUSTED TO KEEP ACPR/ALT = -33/-55dBc 240 ICC (mA) ACPR (dBc) TA = -40°C 210 180 TA = +25°C 150 120 90 TA = +85°C 60 30 0 2 4 6 8 10 12 14 16 18 20 22 MAX2242 toc07 TA = +85°C 305 300 295 TA = -40°C 290 TA = -40°C TA = +25°C -32 POUT = +22 dBm -35 17 18 19 20 21 22 23 2 24 25 2400 2425 2450 FREQUENCY (MHz) 1.8 1.6 1.4 1.2 1 0.8 0.4 280 2400 2425 2450 FREQUENCY (MHz) 2475 2500 5 TA = +85°C 0.6 285 3 -34 POWER DETECTOR VOLTAGE vs. OUTPUT POWER TA = +25°C 1 -33 ICC vs. FREQUENCY 310 -3 -1 ACPR vs. FREQUENCY IDLE CURRENT = 280mA OUTPUT POWER (dBm) PO = +22dBm -7 -5 INPUT POWER (dBm) OUTPUT POWER (dBm) 320 315 -24 -25 -26 -27 -28 -29 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39 -40 16 POWER DETECTOR VOLTAGE (V) 0 -15 -13 -11 -9 MAX2242 toc08 270 3.6 ACPR vs. OUTPUT POWER MAX2242 toc04 ICC vs. OUTPUT POWER 330 3.3 SUPPLY VOLTAGE (V) ACPR (dBc) 3.0 MAX2242 toc05 2.7 4 OUTPUT POWER (dBm) 29 ICC (mA) GAIN (dB) 300 TA = +25°C 28 27 26 25 24 23 22 21 20 19 18 17 16 15 MAX2242 toc03 30 OUTPUT POWER vs. INPUT POWER MAX2242 toc02 TA = -40°C MAX2242 toc01 PO = +22dBm ICC vs. SUPPLY VOLTAGE MAX2242 toc06 GAIN vs. SUPPLY VOLTAGE 31 ICC (mA) MAX2242 2.4GHz to 2.5GHz Linear Power Amplifier 0 2 4 6 8 10 12 14 16 18 20 22 OUTPUT POWER (dBm) _______________________________________________________________________________________ 2475 2500 p2.4GHz to 2.5GHz Linear Power Amplifier SIGMA = 0.25dBm BASED ON 100 PARTS 20 15 10 10 5 5 0 0 12.1 12.3 12.5 12.7 12.9 13.1 13.3 13.5 13.7 2.8 3.4 4.0 4.6 5.2 5.8 6.4 7.0 OUTPUT POWER (dBm) S11, S22, vs. FREQUENCY MAX2242 S21 vs. FREQUENCY -5 30 PIN = -15dBm 29 S21 (dB) S22 -7 MAX2242 toc13 PIN = -15dBm -3 S11, S22 (dB) 2.2 OUTPUT POWER (dBm) MAX2242 toc12 -1 SIGMA = 0.75dBm BASED ON 100 PARTS 15 OCCURRENCES OCCURRENCES 20 MAX2242 toc10 25 MAX2242 toc11 OUTPUT POWER HISTOGRAM AT FIXED 0.5V POWER DETECTOR VOLTAGE OUTPUT POWER HISTOGRAM AT FIXED 0.8V POWER DETECTOR VOLTAGE 28 27 -9 -11 S11 26 -13 25 -15 2400 2420 2440 2460 FREQUENCY (MHz) 2480 2500 2400 2420 2440 2460 2480 2500 FREQUENCY (MHz) _______________________________________________________________________________________ 5 MAX2242 Typical Operating Characteristics (continued) (VCC = +3.3V, fIN = 2.45MHz, RF modulation = IEEE 802.11b, V SHDN = VCC, TA = +25°C, unless otherwise noted.) 2.4GHz to 2.5GHz Linear Power Amplifier MAX2242 Pin Description PIN NAME FUNCTION A1 GND 3rd Stage Ground. Refer to Application Information section for detailed PC-board layout information. A2 VCC2 2nd Stage Supply Voltage. Bypass to ground using configuration in the typical operating circuit. A3 GND 3rd Stage Ground. Refer to Application Information section for detailed PC-board layout information. A4 VCC1 1st Stage Supply Voltage. Bypass to ground using configuration in the typical operating circuit. B1 RF_OUT RF Output. Requires external matching. B2 PD_OUT Power Detector Output. This output is a DC voltage indicating the PA output power. Connect a 47kΩ resistor to GND. B4 GND 1st Stage and Bias Control Circuit Ground C1 BIAS Bias Control. Connect one 8kΩ resistor from BIAS to GND and one 8kΩ resistor from BIAS to DAC block to set the idle current. C2 SHDN Shutdown Input. Drive logic low to place the device in shutdown mode. Drive logic high for normal operation. C3 VCCB Bias Circuit DC Supply Voltage. Bypass to ground using configuration in the typical operating circuit. C4 RF_IN RF Input. Requires external matching. Detailed Description The MAX2242 is a linear PA intended for 2.4GHz ISMband wireless LAN applications. The PA is fully characterized in the 2.4GHz to 2.5GHz ISM band. The PA consists of two driver stages and an output stage. The MAX2242 also features an integrated power detector and power shutdown control mode. Dynamic Power Control The MAX2242 is designed to provide optimum poweradded efficiency (PAE) in both high and low power applications. For a +3.3V supply at high output power level, the output power is typically +22.5dBm with an idle current of 280mA. At low output-power levels, the DC current can be reduced by an external DAC to increase PAE while still maintaining sufficient ACPR performance. This is achieved by using external resistors connected to the BIAS pin to set the bias currents of the driver and output stages. The resistors are typically 8kΩ. Typically, a DAC voltage of 1.0V will give a 280mA bias current. Increasing the DAC voltage will decrease the idle current. Similarly, decreasing the DAC voltage will increase the idle current. The BIAS pin is maintained at a constant voltage of 1.0V, allowing the user to set the desired idle current using only two off-chip 1% resistors: a shunt resistor, R2, from BIAS to ground; and a series resistor, R1, to 6 the DAC voltage, as shown in the Typical Application Circuit. Resistor values R1 and R2 are determined as follows: VMAX = 1.0 + (1.0 ✕ R1) / R2; (ICC = 0, VDAC = VMAX) (1) IMAX = (1.0 ✕ 1867) ✕ (R1 + R2) / (R1 ✕ R2); (ICC = IMAX = max value, VDAC = 0) (2) IDAC = (VDAC - 1.0) / R1 (3) IMID = (1.0 ✕ 1867) / R2; (VDAC = 1.0V or floating) (4) ICC = 1867 ✕ IBIAS (5) where VMAX = is the maximum DAC voltage IMAX = is the maximum idle current IMID = is the idle current with VDAC = 1.0V or not connected VDAC = is the DAC voltage IDAC = is the DAC current If no DAC is used and a constant idle current is desired, use equation 4 to determine the resistor values for a given total bias current. Only R2 is required. _______________________________________________________________________________________ 2.4GHz to 2.5GHz Linear Power Amplifier MAX2242 For a DAC capable of both sourcing and sinking currents, the full voltage range of the DAC (typically from 0 to +3V) can be used. By substituting the desired values of VMAX and IMAX into equations 1 and 2, R1 and R2 can be easily calculated. For a DAC capable of sourcing current only, use equation 4 to determine the value of resistor R2 for the desired maximum current. Use equation 1 to determine the value of resistor R1 for the desired minimum current. For a DAC capable of sinking current only, set resistors R1 and R2 to 0 and connect the DAC directly to the BIAS pin. Use equation 5 to determine the DAC current required for a given ICC. Shutdown Mode Apply logic low to SHDN (pin C2) to place the MAX2242 into shutdown mode. In this mode, all gain stages are disabled and supply current typically drops to 0.5µA. Note that the shutdown current is lowest when V SHDN = 0. Power Detector The power detector generates a voltage proportional to the output power by monitoring the output power using an internal coupler. It is fully temperature compensated and allows the user to set the bandwidth with an exter- _______________________________________________________________________________________ 7 2.4GHz to 2.5GHz Linear Power Amplifier MAX2242 Typical Application Circuit VCC VCC DET OUT DAC 0.1µF 47kΩ SHDN R1 8kΩ R2 8kΩ VCC2 0.1µF PD_OUT 50Ω BIAS 33pF VCCB VCC BIAS CIRCUIT 33pF DETECTOR 10nH VCC1 VCC 0.1µF 100pF RF_IN RF_OUT 1.8pF 6pF 2.2nH GND GND GND NOTE: REFER TO MAX2242 EV KIT DATA SHEET FOR DETAILED LAYOUT INFORMATION. Package Diagram 1.5 0.75 MAX 0.5 C4 B4 A4 C3 B3 NOT USED A3 C2 B2 A2 C1 B1 A1 2.0 UCSP reliability performance shows that it is capable of performing reliably through environmental stresses. Users should also be aware that as with any interconnect system there are electromigration-based current limits that, in this case, apply to the maximum allowable current in the bumps. Reliability is a function of this current, the duty cycle, lifetime, and bump temperature. See the Absolute Maximum Ratings section for any specific limitations listed under Continuous Operating Lifetime.Results of environmental stress tests and additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at www.maxim-ic.com. Chip Information 0.5 TRANSISTOR COUNT: 486 BOTTOM VIEW CHIP-SCALE PACKAGE (ALL DIMENSIONS IN mm) 8 _______________________________________________________________________________________ SIDE VIEW 2.4GHz to 2.5GHz Linear Power Amplifier Package Information 12L, UCSP 4x3.EPS (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.) PACKAGE OUTLINE, 4x3 UCSP 21-0104 F 1 1 Note: MAX2242 does not use bump B3. 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 _____________________ 9 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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