Bluetooth Power Amplifiers
MAX2244/MAX2245 are optimized to deliver a robust +22 dBm output power with 30% power-added efficiency, which overcomes the filter loss between the PA and the antenna and enables +20 dBm to be delivered at the antenna. The MAX2246 is optimized to deliver +20 dBm output power at a 30% reduction in supply current.
The PAs feature an analog power control pin, which allows continuous control of the output power from 0 dBm to maximum power, covering Bluetooth Class 1, 2, and 3 power levels. The closed-loop power control keeps the output nearly constant at any power level between 0 dBm and maximum power. A 1 microamps low-current shutdown mode is available to extend battery life. Internal circuitry automatically controls the ramp up/down of the output power level during turn-on and turn-off to meet Bluetooth spurious emissions requirements.