Line Card

ADL5571: 2.5 GHz to 2.7 GHz WiMAX Power Amplifier

 2009-01-05

【Basic Info】

【Product Feature】

* Gain: 29 dB
* Operation from 2.5 GHz to 2.7 GHz
* EVM ≤ 3% with 16 QAM OFDMA
@ POUT = 25 dBm (3.3 V, 2.6 GHz)
@ POUT = 27 dBm (5 V, 2.6 GHz)
* Input matched to 50 Ω
* Power supply: 3.2 V to 5 V
* Quiescent current: 135 mA
- Power-added efficiency (PAE)
- 21% @ POUT = 25 dBm (3.3 V, 2.6 GHz)
* Multiple operating modes to reduce battery drain
- Standby mode: 9 mA
- Sleep mode: <1 μA
* Frequency Range (MHz) 2500 to 2700
* Gain (dB) 29dB
* Supply Current (max) 130mA
* Package 16-Lead LFCSP
* 1 dB Comp Point (dBm) 31

【Application】

WiMAX mobile terminals and CPEs

【Overview】

The ADL5571 is a high linearity 2.5 GHz to 2.7 GHz power amplifier designed for WiMAX mobile terminals and CPEs using TDD operation at a duty cycle of 50% or lower. With a gain of 29 dB and an output compression point of 31 dBm, it can operate at an output power level up to 27 dBm while maintaining an EVM of ≤3% with a supply voltage of 5 V. PAE is 21% at POUT = 25 dBm with a 3.3 V supply voltage.

The ADL5571 RF input is matched to provide an input return loss of better than 10 dB. The open-collector output is externally matched with a microstrip line and an external shunt capacitor.

The ADL5571 operates over a supply voltage range from 3.2 V to 5 V with a current of 450 mA burst rms when delivering 25 dBm (3.3 V supply). A standby mode is available that reduces the quiescent current to 9 mA, which is useful when a TDD terminal is receiving data.

The ADL5571 is fabricated in a GaAs HBT process and is packaged in a 4 mm × 4 mm, 16-lead, Pb-free, RoHS-compliant LFCSP that uses an exposed paddle for excellent thermal impedance. It operates from −40°C to +85°C.