ADL5387ACPZ-WP1

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 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 of LO levels, excellent demodulation accuracy is achieved with amplitude and phase balances ~0.05 dB and ~0.4°, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered and provide a voltage conversion gain of >4 dB. The buffered baseband outputs are capable of driving a 2 V p-p differential signal into 200 Ω. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. The fully balanced design minimizes effects from second-order distortion. The leakage from the LO port to the RF port is