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AD608

Analog Devices
Part Number AD608
Manufacturer Analog Devices
Description Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem
Published Mar 23, 2005
Detailed Description Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem AD608 FEATURES Mixer −15 dBm, 1 dB compression point −5 dBm IP3 ...
Datasheet PDF File AD608 PDF File

AD608
AD608

Overview
Low Power Mixer/Limiter/RSSI 3 V Receiver IF Subsystem AD608 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 downconvert 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 preamplifier 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 conformance is typically ±1 dB.
The logarithmic slope is proportional to ...


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