LT5515 Datasheet | Linear Technology

LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator .. Features - - - - - - - - - DESCRIPTIO Frequency Range: 1.5GHz to 2.5GHz High IIP3: 20d Bm at 1.9GHz High IIP2: 51d Bm at 1.9GHz Noise Figure: 16.8d B at 1.9GHz Conversion Gain: - 0.7d B at 1.9GHz I/Q Gain Mismatch: 0.3d B I/Q Phase Mismatch: 1° Shutdown Mode 16-Lead QFN 4mm × 4mm Package with Exposed Pad The LT ®5515 is a 1.5GHz to 2.5GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for munications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth up to 260MHz. The LT5515 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, high frequency quadrature generator. In an RF receiver, the high linearity of the LT5515 provides excellent spur-free dynamic range, even with fixed gain front end amplification. This direct conversion receiver can eliminate the need for intermediate frequency (IF) signal processing, as well as the corresponding requirements for image filtering and IF filtering. Channel filtering can be performed directly at the outputs of the I and Q channels. These outputs can interface directly to channelselect filters (LPFs) or to a baseband amplifier. LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U APPLICATIO S - - - - Cellular/PCS/UMTS Infrastructure High Linearity Direct Conversion I/Q Receiver High Linearity I/Q Demodulator RF Power Amplifier Linearization TYPICAL APPLICATIO 5V BPF LNA BPF RF + VCC LT5515 IOUT+ 0° IOUT- LPF POUT, IM2, IM3 (d Bm/TONE) VGA RF - LO + QOUT+ 0°/90° LO - ENABLE EN 90° QOUT - DSP LO INPUT LPF VGA 5515 F01 Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure I/Q Output Power, IM2, IM3 vs RF Input Power 20 0 POUT - 20 IM3 - 40 IM2 -...