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 efficiency 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 dynamically 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-saving
feature is a logic-level shutdown pin that reduces supply current to 0.5?A and eliminates the need for an external supply switch. The integrated shutdown function also allows guaranteed device
ramp-on and ramp-off times.
The MAX2247 integrates a power detector with 20dB dynamic range and
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