LT5516 Datasheet | Linear Technology

LT5516 800MHz to 1.5GHz Direct Conversion Quadrature Demodulator Features s s s s s s s s DESCRIPTIO Frequency Range: 800MHz to 1.5GHz High IIP3: 21.5d Bm at 900MHz High IIP2: 52d Bm Noise Figure: 12.8d B at 900MHz Conversion Gain: 4.3d B at 900MHz I/Q Gain Mismatch: 0.2d B Shutdown Mode 16-Lead QFN 4mm × 4mm Package with Exposed Pad The LT ®5516 is an 800MHz to 1.5GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for munications 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 quadrature 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 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 channelselect filters (LPFs) or to a baseband amplifier. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s s Cellular/PCS/UMTS Infrastructure High Linearity Direct Conversion I/Q Receiver High Linearity I/Q Demodulator TYPICAL APPLICATIO BPF LNA BPF 5V RF + VCC LT5516 IOUT+ 0° IOUT- LPF VGA RF - LO + QOUT 0°/90° LO - ENABLE EN 90° QOUT- + POUT, IM3 (d Bm/TONE) DSP LO INPUT LPF VGA 5516 F01 Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure I/Q Output Power, IM3 vs RF Input Power 20 0 POUT - 20 - 40 IM3 - 60 - 80 - 100 - 18 VCC = 5v TA = 25°C PLO = - 10d Bm f LO = 901MHz f RF1 = 899.9MHz f RF2 = 900.1MHz 2 6 5516 TA01 - 14 -...