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AD606JR
a 50 MHz, 80 dB Demodulating Logarithmic Amplifier with Limiter Output AD606 a loadable output voltage of +0.1 V dc to +4 V dc. The logarithmic scaling is such that the output is +0.5 V for a sinusoidal input of –75 dBm and +3.5 V at an input of +5 dBm; over this range the logarithmic linearity is typically within ± 0.4 dB. All scaling parameters are proportional to the supply voltage. FEATURES Logarithmic Amplifier Performance –75 dBm to +5 dBm Dynamic Range ≤1.5 nV/√Hz Input Noise Usable to >50 MHz 37.5 mV/dB Voltage Output On-Chip Low-Pass Output Filter Limiter Performance ؎1 dB Output Flatness over 80 dB Range ؎3؇ Phase Stability at 10.7 MHz over 80 dB Range Adjustable Output Amplitude Low Power +5 V Single Supply Operation 65 mW Typical Power Consumption CMOS-Compatible Power-Down to 325 W typ <5 s Enable/Disable Time The AD606 can operate above and below these limits, with reduced linearity, to provide as much as 90 dB of conversion range. A second low-pass filter automatically nulls the input offset of the first stage down to the submicrovolt level. Adding external capacitors to both filters allows operation at input frequencies as low as a few hertz. The AD606’s limiter output provides a hard-limited signal output as a differential current of ± 1.2 mA from open-collector outputs. In a typical application, both of these outputs are loaded by 200 Ω resistors to provide a voltage gain of more than 90 dB from the input. Transition times are 1.5 ns, and the phase is stable to within ± 3° at 10.7 MHz for signals from –75 dBm to +5 dBm. APPLICATIONS Ultrasound and Sonar Processing Phase-Stable Limiting Amplifier to 100 MHz Received Signal Strength Indicator (RSSI) Wide Range Signal and Power Measurement The logarithmic amplifier operates from a single +5 V supply and typically consumes 65 mW. It is enabled by a CMOS logic level voltage input, with a response time of <5 µs. When disabled, the standby power is reduced to <1 mW within 5 µs. PRODUCT DESCRIPTION The AD606J is specified for the commercial temperature range of 0°C to +70°C and is available in 16-lead plastic DIPs or SOICs. Consult the factory for other packages and temperature ranges. The AD606 is a complete, monolithic logarithmic amplifier using a 9-stage “successive-detection” technique. It provides both logarithmic and limited outputs. The logarithmic output is from a three-pole post-demodulation low-pass filter and provides FUNCTIONAL BLOCK DIAGRAM INHI COMM PRUP VPOS FIL1 FIL2 LADJ LMHI 16 15 14 13 12 11 10 9 REFERENCE AND POWER-UP 30pF 360k⍀ X1 30k⍀ 360k⍀ 30pF 30k⍀ OFFSET-NULL LOW-PASS FILTER 1.5k⍀ 250⍀ 9.375k⍀ 12A/dB HIGH-END DETECTORS 1.5k⍀ FINAL LIMITER MAIN SIGNAL PATH 11.15dB/STAGE ONE-POLE FILTER AD606 2pF 9.375k⍀ TWO-POLE SALLEN-KEY FILTER X2 2pF 2A/dB 1 2 3 4 5 6 7 8 INLO COMM ISUM ILOG BFIN VLOG OPCM LMLO REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999
AD
Analog Devices
U.S.A
半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。
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