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MAX2247 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX2247 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 10 page General Description The MAX2247 low-voltage, three-stage linear power amplifier (PA) is optimized for 802.11b/g wireless LAN (WLAN) applications in the 2.4GHz ISM band. The device is integrated with an adjustable bias control, power detector, and shutdown mode. The MAX2247 features 29dB of power gain and delivers up to +24dBm of linear output power at 24% efficiency from a single +3.3V supply. It achieves less than -32dBc first- side lobe suppression and less than -55dBc second- side lobe suppression under 802.11b modulation. In addition, the device can be matched for optimum effi- ciency and performance at output power levels from +10dBm to +24dBm. Its high +28dBm saturated output power also allows the device to meet the requirements of 802.11g OFDM modulation. The MAX2247 features an external bias-control pin that allows the supply current of the device to be dynamical- ly throttled back at lower output power levels, thus improving efficiency while maintaining sufficient side- lobe suppression. Proprietary internal bias circuitry maintains stable device performance over temperature and voltage-supply variations. An additional power-sav- ing feature is a logic-level shutdown pin that reduces supply current to 0.5µA and eliminates the need for an external supply switch. The integrated shutdown func- tion also allows guaranteed device ramp-on and ramp- off times. The MAX2247 integrates a power detector with 20dB dynamic range and ±0.8dB accuracy at the highest output power level. The detector provides a buffered DC voltage proportional to the output power of the device, saving cost and space by eliminating a coupler and op amp usually required to implement a power detector function. The device is packaged in the tiny 3 ✕ 4 chip-scale package (UCSP™), measuring only 1.5mm ✕ 2mm, making it the ideal solution for radios built in small form factors. Applications IEEE 802.11b DSSS WLAN IEEE 802.11g OFDM WLAN HomeRF™ 2.4GHz Cordless Phones 2.4GHz ISM Radios Features ♦ 2.4GHz to 2.5GHz Operating Range ♦ Up to +24dBm Linear Output Power (ACPR of Less than -32dBc First-Side Lobe and Less than -55dBc Second-Side Lobe) ♦ 24% PAE at +24dBm Linear Output Power, 3.3V 24% PAE at +21dBm Linear Output Power, 3.0V ♦ 29dB Power Gain ♦ On-Chip Power Detector with Buffered Output ♦ Internal 50Ω Input Matching ♦ External Bias Control for Current Throttleback ♦ Integrated Bias Circuitry ♦ +2.7V to +4.2V Single-Supply Operation ♦ 0.5µA Shutdown Mode ♦ Tiny Chip-Scale Package (1.5mm ✕ 2mm) 2.4GHz SiGe Linear Power Amplifier ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2520; Rev 4; 8/03 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. Typical Operating Circuit appears at end of data sheet. PART TEMP RANGE PIN- PACKAGE TOP MARK MAX2247EBC-T -40°C to +85°C 3 x 4 UCSP* AAW TOP VIEW BIAS A1 GND3 B1 RF_ OUT C1 VCC2 A2 C2 GND2 A3 PD_ OUT B3 VCCB C3 VCC1 A4 GND1 B4 RF_IN C4 MAX2247 SHDN Pin Configuration *Requires special solder temperature profile in the Absolute Maximum Ratings Sections. UCSP is a trademark of Maxim Integrated Products, Inc. HomeRF is a trademark of HomeRF Working Group. |
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