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AD608ARZ 데이터시트(PDF) 1 Page - Analog Devices |
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AD608ARZ 데이터시트(HTML) 1 Page - Analog Devices |
1 / 16 page Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem AD608 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1996–2009 Analog Devices, Inc. All rights reserved. FEATURES Mixer −15 dBm, 1 dB compression point −5 dBm IP3 24 dB conversion gain >500 MHz input bandwidth Logarithmic/limiting amplifier 80 dB RSSI range ±3° phase stability over 80 dB range Low power 21 mW at 3 V power consumption CMOS-compatible power-down to 300 μW typical 200 ns enable/disable time APPLICATIONS PHS, GSM, TDMA, FM, or PM receivers Battery-powered instrumentation Base station RSSI measurements GENERAL DESCRIPTION The AD608 provides a low power, low distortion, low noise mixer as well as a complete, monolithic logarithmic/limiting amplifier that uses a successive-detection technique. In addition, the AD608 provides both a high speed received signal strength indicator (RSSI) output with 80 dB dynamic range and a hard-limited output. The RSSI output is from a two-pole postdemodulation low-pass filter and provides a loadable output voltage of 0.2 V to 1.8 V. The AD608 operates from a single 2.7 V to 5.5 V supply at a typical power level of 21 mW at 3 V. The RF and local oscillator (LO) bandwidths both exceed 500 MHz. In a typical IF application, the AD608 can accept the output of a 240 MHz surface acoustic wave (SAW) filter and down- convert it to a nominal 10.7 MHz IF with a conversion gain of 24 dB (ZIF = 165 Ω). The AD608 logarithmic/limiting amplifier section handles any IF from low frequency (LF) up to 30 MHz. The mixer is a doubly balanced gilbert-cell mixer and operates linearly for RF inputs spanning −95 dBm to −15 dBm. It has a nominal −5 dBm third-order intercept. An on-board LO pre- amplifier requires only −16 dBm of LO drive. The current output of the mixer drives a reverse-terminated, industry-standard 10.7 MHz, 330 Ω filter. The nominal logarithmic scaling is such that the output is +0.2 V for a sinusoidal input to the IF amplifier of −75 dBm and +1.8 V at an input of +5 dBm; over this range, the logarithmic confor- mance is typically ±1 dB. The logarithmic slope is proportional to the supply voltage. A feedback loop automatically nulls the input offset of the first stage down to the submicrovolt level. The AD608 limiter output provides a hard-limited signal output at 400 mV p-p. The voltage gain of the limiting amplifier to this output is more than 100 dB. Transition times are 11 ns and the phase is stable to within ±3° at 10.7 MHz for signals from −75 dBm to +5 dBm. The AD608 is enabled by a CMOS logic-level voltage input, with a response time of 200 ns. When disabled, the standby power is reduced to 300 μW within 400 ns. The AD608 is specified for the industrial temperature range of −25°C to +85°C for 2.7 V to 5.5 V supplies and −40°C to +85°C for 3.0 V to 5.5 V supplies. This device comes in a 16-lead plastic SOIC. FUNCTIONAL BLOCK DIAGRAM 24dB MIXER GAIN 110dB LIMITER GAIN 90dB RSSI BIAS MXOP MIXER BPF DRIVER VMID LO PREAMP AD608 RFHI RFLO IF INPUT –75dBm TO +15dBm2 IFHI IFLO LMOP VPS2 RSSI FDBK COM3 FINAL LIMITER 100nF 10nF 330Ω ±50µA 330Ω MIDSUPPLY IF BIAS LIMITER OUTPUT 400mV p-p PRUP RF INPUT –95dBm TO –15dBm1 VPS1 COM1 COM2 LOHI RSSI OUTPUT 20mV/dB 0.2V TO 1.8V 3dB NOMINAL INSERTION LOSS +2.7V TO 5.5V 5-STAGE IF AMPLIFIER (16dB PER STAGE) 7 FULL-WAVE RECTIFIER CELLS 2.7V TO 5.5V LO INPUT –16dBm CMOS LOGIC INPUT ±6mA MAX OUTPUT (±890mV INTO 165Ω) 100Ω 18nF 1–15dBm = ±56mV MAXIMUM FOR LINEAR OPERATION. 239.76µV RMS TO 397.6mV RMS FOR ±1dB RSSI ACCURACY. 2MHz LPF 10.7MHz BAND-PASS FILTER 5 6 1 2 3 4 16 8 7 10 13 9 15 14 12 11 + Figure 1. |
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