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LT5520 Datasheet(PDF) 1 Page - Linear Technology |
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LT5520 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LT5520 1 5520f APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO s Wide RF Output Frequency Range: 1.3GHz to 2.3GHz s 15.9dBm Typical Input IP3 at 1.9GHz s On-Chip RF Output Transformer s No External LO or RF Matching Required s Single-Ended LO and RF Operation s Integrated LO Buffer: –5dBm Drive Level s Low LO to RF Leakage: – 41dBm Typical s Wide IF Frequency Range: DC to 400MHz s Enable Function with Low Off-State Leakage Current s Single 5V Supply s Small 16-Lead QFN Plastic Package s Wireless Infrastructure s Cable Downlink Infrastructure s Point-to-Point Data Communications s High Linearity Frequency Conversion 1.3GHz to 2.3GHz High Linearity Upconverting Mixer The LT ®5520 mixer is designed to meet the high linearity requirements of wireless and cable infrastructure trans- mission applications. A high-speed, internally matched, LO amplifier drives a double-balanced mixer core, allow- ing the use of a low power, single-ended LO source. An RF output transformer is integrated, thus eliminating the need for external matching components at the RF output, while reducing system cost, component count, board area and system-level variations. The IF port can be easily matched to a broad range of frequencies for use in many different applications. The LT5520 mixer delivers 15.9dBm typical input 3rd order intercept point at 1.9GHz with IF input signal levels of –10dBm. The input 1dB compression point is typically 4dBm. The IC requires only a single 5V supply. , LTC and LT are registered trademarks of Linear Technology Corporation. Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter RF Output Power and Output IM3 vs IF Input Power (Two Input Tones) IF+ IF – LO– LO+ RF+ RF – PA LO INPUT –5dBm BIAS EN VCC1 VCC2 VCC3 5VDC 5520 F01 BPF BPF GND IF INPUT 4:1 220pF 220pF 15pF 100 Ω 100 Ω (OPTIONAL) 1 µF 1000pF 39nH RF OUTPUT 10pF 5pF 5pF 85 Ω LT5520 IF INPUT POWER (dBm/TONE) –16 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 0 5520 • F01b –12 –8 –4 4 PLO = –5dBm fLO = 1760MHz fIF1 = 140MHz fIF2 = 141MHz fRF = 1900MHz TA = 25°C POUT IM3 |
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