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详细说明： FEATURES I/Q Demodulator RF frequency 400 MHz to 6000MHz IIP3 +31 dBm IIP2 +60dBm Input P1dB +12dBm NF 13.2 dB @ 2.5GHz Voltage Conversion Gain of 4dB Quadrature demodulation accuracy Phase accuracy <0.5° Amplitude balance <0.25 dB LO Input –10 to +6 dBm Demodulation Bandwidth ~500 MHz I/Q Drive 2Vpp into 200Ω APPLICATIONS QAM/QPSK demodulator W-CDMA/CDMA/CDMA2000/GSM Point-to-(Multi)Point Radio WiMax/LTE GENERAL DESCRIPTION The ADL5380 is a high performance quadrature I-Q demodulator that covers an RF input frequency ra nge from 400 MHz to 6 GHz. With a NF = 13dB, IP1dB = 12dBm and IIP3 = 31dBm at 2.5GHz, the demodulator offers good dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF inputs provide a well-behaved broad-band input impedance of 50Ω and should be driven from a 1:1 balun for best performance. Excellent quadrature accuracy is achieved using on-chip polyphase filters for LO quadrature generation. Over a wide range of local oscillator (LO) levels, excellent demodulation accuracy is achieved with phase and amplitude balances < 0.25 dB and < 0.5o, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered. The ADL5380 provides a typical voltage conversion gain of 4dB independent of differential load impedances as low as 100 Ω with a drive capability exceeding 2Vpp in to 200 Ω. The fully balanced design minimizes effects from 2nd order distortion. The leakage from the LO port to the RF port is <- 60dBc. Differential DC-offsets at the I and Q outputs are <10mV. Both of these factors contribute to the excellent IIP2 of >60dBm. The ADL5380 operates off a 4.75V to 5.25V supply with a typical supply current of 200mA. The ADL5380 is fabricated using Analog Devices’ advanced Silicon-Germanium bipolar process and is available in a 24-lead exposed paddle LFCSP package. Performance is specified over a -40oC to +85oC temperature range. Rev. PrB 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 . 2008 Analog Devices, Inc. All rights reserved. 表格： SPECIFICATIONS Table 1. VS = 5 V, TA = 25oC, RBIAS = 1.5kΩ for RF ≤ 3GHz, RBIAS = 200Ω for RF ≥ 3GHz, Zo= 50 Ω unless otherwise noted. I & Q are loaded to 50 Ω using a 9:1 balun. Loss of RF input balun de-embedded from measurements. M/A COM ETC1-1-13 used for RF ≤ 3GHz. Johanson 3600BL14M050 used for 3GHz ≤ RF≤ 4GHz. Parameter Condition Min Typ Max Unit OPERATING CONDITIONS LO Frequency Range 0.4 6 GHz RF input Impedance 50 Ω RF Frequency Range 0.4 6 GHz RF INPUT @ 700MHz RFIP, RFIN Input P1dB 11.2 dBm Voltage Conversion Gain 450Ω load on QHI, QLO, IHI, ILO 4.3 dB Second Order Input Intercept (IIP2) -5 dBm Each Tone 72 dBm Third Order Input Intercept (IIP3) -5 dBm Each Tone 28 dBm Noise Figure 11.5 dB With a -4dBm interferer 5MHz away TBD dB RF INPUT @ 1900MHz RFIP, RFIN Input P1dB 11 dBm Voltage Conversion Gain 450Ω load on QHI, QLO, IHI, ILO 3.5 dB Second Order Input Intercept (IIP2) -5 dBm Each Tone 67 dBm Third Order Input Intercept (IIP3) -5 dBm Each Tone 27 dBm Noise Figure 12.8 dB With a -4dBm interferer 5MHz away TBD dB RF INPUT @ 2500MHz RFIP, RFIN Input P1dB 12 dBm Voltage Conversion Gain 450Ω load on QHI, QLO, IHI, ILO 2.9 dB Second Order Input Intercept (IIP2) -5 dBm Each Tone 60 dBm Third Order Input Intercept (IIP3) -5 dBm Each Tone 31 dBm Noise Figure 13.2 dB With a -4dBm interferer 5MHz away TBD dB RF INPUT @ 3500MHz RFIP, RFIN Input P1dB 11 dBm Voltage Conversion Gain 450Ω load on QHI, QLO, IHI, ILO 4.5 dB Second Order Input Intercept (IIP2) -5 dBm Each Tone 54 dBm Third Order Input Intercept (IIP3) -5 dBm Each Tone 22 dBm Noise Figure 14.7 dB With a -4dBm interferer 5MHz away TBD dB LO INPUT LOIP, LOIN Input Return Loss AC-coupled into LOIP with LOIN bypassed, measured at 2GHz 9 dB LO input level -10 5 dBm LO-RF Leakage RFIN,RFIP terminated in 50 Ω, LO Power= 0dBm –57 dBm Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 表格2 Table 2. Pin Function Descriptions Pin No. Mnemonic Description 1,2,5,8,11,14,17,18,20,23 GND Ground Connect. 6, 13, 24 VCC Supply. Positive supply for LO, IF, biasing, and baseband sections. These pins should be decoupled to the board ground using appropriate-sized capacitors. o a low impedance ground plane. 12, NC Do not connect these pins. 7 ENBL Enable Control. current. The default setting for this pin is open. 9,10 LOIP, LOIN Local Oscillator Input. Pins must be ac-coupled. A differential drive through a balun (recommended balun is the M/A-COM ETC1-1-13 for lower frequecies and Johanson xxxx for higher frequecies) is necessary to achieve optimal performance. 3,4,15,16 IHI, ILO, QLO, QHI I Channel and Q Channel Mixer Baseband Outputs. These outputs have a 50 Ω differential output impedance (25 Ω per pin). Each output pair can swing 2 V p-p (differential) into a load of 200 Ω. Output 3 dB bandwidth is ~ 500 MHz. 19 ADJ A resistor to VPOS that optimizes third order intercept. For operation < 3GHz, RADJ = 1.5 kΩ. For operation from 3GHz to 4GHz, RADJ = 200Ω. 21, 22 RFIN, RFIP RF Input. A single-ended 50 Ω signal can be applied to the RF inputs through a 1:1 balun (recommended balun is the M/A-COM ETC1-1-13 for lower frequecies and Johanson xxxx for higher frequecies). EP Exposed Paddle. Connect to a low impedance thermal and electrical ground plane. The ADL5382 evaluation board is available. There are two versions of the board, optimized for performance for separate frequency ranges. For operation < 3GHz, an FR4 material based board with the ETC1-1-13 balun footprint is available. For operation between 3GHz to 4GHz, a Rogers material based board with the Johanson 3600BL14M050 balun footprint is available. The board can be used for single-ended or differential baseband analysis. The default configuration of the board is for single-ended baseband analysis. ...展开收缩
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