DESCRIPTION
The SA2421 transceiver is a combined low–noise amplifier, receive mixer, transmit mixer and LO buffer IC designed using a 20 GHz fT BiCMOS process, QUBiC2, for high–performance low–power communication systems for 2.4–2.5 GHz applications. The LNA has a 3.2 dB noise figure at 2.45 GHz with 14.3 dB gain and an IP3 intercept of –3 dBm at the input. The wide–dynamic–range receive mixer has a 11.2 dB noise figure and an input IP3 of +2.5 dBm at 2.45 GHz. The nominal current drawn from a single 3 V supply is 34 mA in transmit mode and 20 mA in receive mode. The SA2421 differs from the SA2420 by removal of the LO doubler and LO switch. The LNA reverse isolation is improved, and a separate pin is allocated for the transmit output.

FEATURES
• Low current consumption: 34 mA nominal transmit mode and 20 mA nominal receive mode
• High system power gain: 24 dB (LNA + Mixer) at 2.45 GHz
• Excellent gain stability versus temperature and supply voltage
• Separate Rx IN and Tx OUT pins
• Wide IF range: 50–500 MHz
• –10dBm typical LO input power
• Improved LNA reverse isolation S12
• TSSOP24 package

APPLICATIONS
• IEEE 802.11 (WLAN)
• 2.45 GHz ISM band