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LTC1957 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1957 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LT5516 1 5516f The LT ®5516 is an 800MHz to 1.5GHz direct conversion quadrature demodulator optimized for high linearity re- ceiver applications. It is suitable for communications receivers where an RF or IF signal is directly converted into I and Q baseband signals with bandwidth up to 260MHz. The LT5516 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 LT5516 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. s Cellular/PCS/UMTS Infrastructure s High Linearity Direct Conversion I/Q Receiver s High Linearity I/Q Demodulator , LTC and LT are registered trademarks of Linear Technology Corporation. s Frequency Range: 800MHz to 1.5GHz s High IIP3: 21.5dBm at 900MHz s High IIP2: 52dBm s Noise Figure: 12.8dB at 900MHz s Conversion Gain: 4.3dB at 900MHz s I/Q Gain Mismatch: 0.2dB s Shutdown Mode s 16-Lead QFN 4mm × 4mm Package with Exposed Pad 800MHz to 1.5GHz Direct Conversion Quadrature Demodulator Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure BPF 5V VCC BPF RF+ RF – LPF LT5516 IOUT + IOUT – 0 ° LO+ LO INPUT LO– EN ENABLE LPF DSP QOUT + QOUT – 90 ° 0 °/90° 5516 F01 LNA VGA VGA 20 0 –20 –40 –60 –80 –100 RF INPUT POWER (dBm) –18 –14 –10 –6 –2 26 5516 TA01 POUT IM3 VCC = 5v TA = 25°C PLO = –10dBm fLO = 901MHz fRF1 = 899.9MHz fRF2 = 900.1MHz I/Q Output Power, IM3 vs RF Input Power APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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