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LTC5530 Datasheet(PDF) 1 Page - Linear Technology |
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LTC5530 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LT5575 1 5575f LO INPUT POWER (dBm) –15 15 20 25 5 5575 TA01b 10 5 0 –10 –5 0 35 30 30 40 50 20 10 0 70 60 CONV GAIN DSB NF IIP2 IIP3 –40 °C 25 °C 85 °C TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator The LT®5575 is an 800MHz to 2.7GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for communications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth up to 490MHz. The LT5575 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, high frequency quadrature phase shifter. The integrated on-chip broadband transform- ers provide 50Ω single-ended interfaces at the RF and LO inputs. Only a few external capacitors are needed for its application in an RF receiver system. The high linearity of the LT5575 provides excellent spur- free dynamic range for the receiver. This direct conversion demodulator can eliminate the need for intermediate fre- quency (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 channel-select filters (LPFs) or to baseband amplifiers. High Signal-Level I/Q Demodulator for Wireless Infrastructure ■ Input Frequency Range: 0.8GHz to 2.7GHz* ■ 50Ω Single-Ended RF and LO Ports ■ High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz ■ High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz ■ Input P1dB: 13.2dBm at 900MHz ■ I/Q Gain Mismatch: 0.04dB Typical ■ I/Q Phase Mismatch: 0.4° Typical ■ Low Output DC Offsets ■ Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz ■ Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz ■ Very Few External Components ■ Shutdown Mode ■ 16-Lead QFN 4mm × 4mm Package with Exposed Pad ■ Cellular/PCS/UMTS Infrastructure ■ RFID Reader ■ High Linearity Direct Conversion I/Q Receiver Conversion Gain, NF, IIP3 and IIP2 vs LO Input Power at 1900MHz BPF +5V VCC BPF RF INPUT RF LPF LT5575 IOUT + IOUT – 0 ° LO LO INPUT EN ENABLE LPF QOUT + QOUT – 90 ° 0 °/90° 5575 TA01 LNA VGA VGA A/D A/D , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Operation over a wider frequency range is possible with reduced performance. Consult the factory. |
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