閉ループ出力制御内蔵の小型Bluetoothパワーアンプ
Note to Editor: MAX2244/MAX2245/MAX2246 is the first Bluetooth power amplifiers on the market that offer an integrated closed-loop power control, saving 24 components and $0.71 extra cost compared to an off-chip discrete implementation. The power control provides near constant performance over full temperature, supply, and input power range.
SUNNYVALE, CA-February 6, 2002-Maxim Integrated Products introduces the
MAX2244/MAX2245/MAX2246 family of 2.4GHz power amplifiers (PA) designed for Bluetooth Class 1 radio modules. The PAs integrate a unique closed-loop power control circuit that enables a near constant output power over full temperature (-40°C to +85°C), voltage supply (+3.0V to +3.6V), and input power range (-4dBm to +4dBm). Compared to a discrete implementation, the integrated closed-loop control circuit saves 24 components, $0.71 extra cost, and significant board space. The PAs are available in the tiny 3 x 3 ultra-chip-scale package (UCSP™), measuring only 1.56mm x 1.56mm. The small size makes them ideal for embedded Bluetooth application in cellular phones, notebook computers, and PDAs.
MAX2244/MAX2245 are optimized to deliver a robust +22dBm output power with 30% power-added efficiency, which overcomes the filter loss between the PA and the antenna and enables +20dBm to be delivered at the antenna. The MAX2246 (available in December) is optimized to deliver +20dBm 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 0dBm 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 0dBm and maximum power. A 1µA 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.
Prices start at $1.69 (1000-up, FOB USA). A fully assembled evaluation kit (MAX2244/45EVKIT) is available to help reduce design time. Visit the Maxim website (www.maxim-ic.com) to get the full data sheet and information on Maxim’s full line of RFIC products.
 |
