ADL5387

50 MHz to 2 GHz Quadrature Demodulator ADL5387 FEATURES Operating RF frequency 50 MHz to 2 GHz LO input at 2 × fLO 100 MHz to 4 GHz Input IP3: 31 dBm @ 900 MHz Input IP2: 62 dBm @ 900 MHz Input P1dB: 13 dBm @ 900 MHz www.DataSheet4U.com Noise figure (NF) 12.0 dB @ 140 MHz 14.7 dB @ 900 MHz Voltage conversion gain > 4 dB Quadrature demodulation accuracy Phase accuracy ~0.4° Amplitude balance ~0.05 dB Demodulation bandwidth ~240 MHz Baseband I/Q drive 2 V p-p into 200 Ω Single 5 V supply FUNCTIONAL BLOCK DIAGRAM 24 1 2 3 4 5 6 23 22 21 20 19 CMRF CMRF RFIP RFIN CMRF VPX VPA VPB 18 COM BIAS VPL VPL VPL CML 7 LOIP LOIN CML 8 9 10 CML 11 DIVIDE-BY-2 PHASE SPLITTER VPB 17 QHI 16 QLO 15 IHI 14 ILO 13 12 06764-001 COM Figure 1. APPLICATIONS QAM/QPSK RF/IF demodulators W-CDMA/CDMA/CDMA2000/GSM Microwave point-to-(multi)point radios Broadband wireless and WiMAX Broadband CATVs GENERAL DESCRIPTION The ADL5387 is a broadband quadrature I/Q demodulator that covers an RF/IF input frequency range from 50 MHz to 2 GHz. With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm @ 450 MHz, the ADL5387 demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF/IF inputs provide a wellbehaved broadband input impedance of 50 Ω and are best driven from a 1:1 balun for optimum performance. Ultrabroadband operation is achieved with a divide-by-2 method for local oscillator (LO) quadrature generation. Over a wide range...