0.4GHz to 2.7GHz High Linearity Upconverting Mixer

The LT5578 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 –1dBm 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 –0.7dB, high OIP3 of 24.3dBm and a low noise floor of –158dBm/Hz at a –5dBm 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, combined with the excellent LO leakage performance, translate into lower LO signal contamination of the output signal.

Applications

* GSM 900PCS/1800PCS and W-CDMA Infrastructure

* LTE and WiMAX Basestations

* Wireless Repeaters

* Public Safety Radios

* High Output IP3:

* 27dBm at 0.9GH

* 24.3dBm at 1.95GHz

* Low Noise Floor: –158dBm/Hz (POUT = –5dBm)

* High Conversion Gain: 1.4dB at 0.9GHz

* Noise Figure: 8.6dB

* Low LO-RF Leakage: –43dBm

* Single-Ended RF and LO Ports

* Low LO Drive Level: –1dBm

* Single 3.3V Supply

* 5mm × 5mm QFN24 Package (Pin Compatible with LT5579)