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LT5515 Datasheet(PDF) 1 Page - Linear Technology |
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LT5515 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LT5515 1 5515fa LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LT ®5515 is a 1.5GHz to 2.5GHz direct conversion quadrature demodulator optimized for high linearity re- ceiver applications. It is suitable for communications 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 quadra- ture 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 require- ments 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 channel- select filters (LPFs) or to a baseband amplifier. ■ Cellular/PCS/UMTS Infrastructure ■ High Linearity Direct Conversion I/Q Receiver ■ High Linearity I/Q Demodulator ■ RF Power Amplifier Linearization ■ Frequency Range: 1.5GHz to 2.5GHz ■ High IIP3: 20dBm at 1.9GHz ■ High IIP2: 51dBm at 1.9GHz ■ Noise Figure: 16.8dB at 1.9GHz ■ Conversion Gain: –0.7dB at 1.9GHz ■ I/Q Gain Mismatch: 0.3dB ■ I/Q Phase Mismatch: 1 ° ■ Shutdown Mode ■ 16-Lead QFN 4mm × 4mm Package with Exposed Pad 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure BPF 5V VCC BPF RF+ RF – LPF LT5515 IOUT + IOUT – 0 ° LO+ LO INPUT LO– EN ENABLE LPF DSP QOUT + QOUT – 90 ° 0 °/90° 5515 F01 LNA VGA VGA I/Q Output Power, IM2, IM3 vs RF Input Power APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO RF INPUT POWER (dBm) –16 20 0 –20 –40 –60 –80 –100 –12 –8 –4 0 5515 • TA01 48 POUT IM3 IM2 TA = 25°C PLO = –5dBm fLO = 1901MHz fRF1 = 1899.9MHz fRF2 = 1900.1MHz |
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