LT5578 Datasheet | Linear Technology

.. LT5578 0.4GHz to 2.7GHz High Linearity Upconverting Mixer DESCRIPTION The LT®5578 mixer is a high performance upconverting mixer optimized for frequencies in the 0.4GHz to 2.7GHz range. The single-ended LO input and RF output ports simplify board layout and reduce system cost. The mixer needs only - 1d Bm of LO power and the balanced design results in low LO signal leakage to the RF output. At 1.95GHz operation, the LT5578 provides conversion gain of - 0.7d B, high OIP3 of 24.3d Bm and a low noise floor of - 158d Bm/Hz at a - 5d Bm RF output signal level. The LT5578 offers a high performance alternative to passive mixers. Unlike passive mixers, which have conversion loss and require high LO drive levels, the LT5578 delivers conversion gain at significantly lower LO input levels and is less sensitive to LO power level variations. The lower LO drive level requirements, bined with the excellent LO leakage performance, translate into lower LO signal contamination of the output signal. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Features n n n n n n n n n High Output IP3: 27d Bm at 0.9GHz 24.3d Bm at 1.95GHz Low Noise Floor: - 158d Bm/Hz (POUT = - 5d Bm) High Conversion Gain: 1.4d B at 0.9GHz Noise Figure: 8.6d B Low LO-RF Leakage: - 43d Bm Single-Ended RF and LO Ports Low LO Drive Level: - 1d Bm Single 3.3V Supply 5mm × 5mm QFN24 Package (Pin patible with LT5579) APPLICATIONS n n n n GSM 900PCS/1800PCS and W-CDMA Infrastructure LTE and Wi MAX Basestations Wireless Repeaters Public Safety Radios TYPICAL APPLICATION Frequency Upconversion in LTE Transmitter LO INPUT - 1d Bm 2.7p F 6.8p F 30 LT5578 LO GND 13.7Ω IF 140MHz 100n H IF+ 39p F IF- RF 22n H 2p F BIAS RF 700MHz 13n H TO 950MHz 2.7p F GAIN (d B), NF (d B), OIP3 (d Bm) 25 20 15 10 5 GAIN 100n H VCC 10μF 100μF 5579 TA01a Gain, NF and OIP3 vs RF Output Frequency OIP3 TC4-1W+ 220p F...