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AD8309

Analog Devices
Part Number AD8309
Manufacturer Analog Devices
Description 5 MHz.500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output
Published Mar 23, 2005
Detailed Description a 5 MHz–500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output AD8309 FUNCTIONAL BLOCK DIAGRAM SIX STAGE...
Datasheet PDF File AD8309 PDF File

AD8309
AD8309

Overview
a 5 MHz–500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output AD8309 FUNCTIONAL BLOCK DIAGRAM SIX STAGES TOTAL GAIN 72dB INHI 12dB INLO LADR ATTEN 4 ؋ DET BIAS CTRL I-V TEN DETECTORS SPACED 12dB 12dB 12dB LIM LMLO LMDR TYP GAIN 18dB LMHI FEATURES Complete Multistage Log-Limiting IF Amplifier 100 dB Dynamic Range: –78 dBm to +22 dBm (Re 50 ⍀ ) Stable RSSI Scaling Over Temperature and Supplies: 20 mV/dB Slope, –95 dBm Intercept ؎0.
4 dB RSSI Linearity up to 200 MHz Programmable Limiter Gain and Output Current Differential Outputs to 10 mA, 2.
4 V p-p Overall Gain 100 dB, Bandwidth 500 MHz Constant Phase (Typical ؎80 ps Delay Skew) Single Supply of +2.
7 V to +6.
5 V at 16 mA Typical Fully Differential Inputs, RIN = 1 k ⍀, CIN = 2.
5 pF 500 ns Power-Up Time, <1 ␮ A Sleep Current APPLICATIONS Receivers for Frequency and Phase Modulation Very Wide Range IF and RF Power Measurement Receiver Signal Strength Indication (RSSI) Low Cost Radar and Sonar Signal Processing Instrumentation: Network and Spectrum Analyzers DET DET DET VLOG FLTR ENBL GAIN BIAS BAND-GAP REFERENCE SLOPE BIAS INTERCEPT TEMP COMP PRODUCT DESCRIPTION The AD8309 is a complete IF limiting amplifier, providing both an accurate logarithmic (decibel) measure of the input signal (the RSSI function) over a dynamic range of 100 dB, and a programmable limiter output, useful from 5 MHz to 500 MHz.
It is easy to use, requiring few external components.
A single supply voltage of +2.
7 V to +6.
5 V at 16 mA is needed, corresponding to a power consumption of under 50 mW at 3 V, plus the limiter bias current, determined by the application and typically 2 mA, providing a limiter gain of 100 dB when using 200 Ω loads.
A CMOS-compatible control interface can enable the AD8309 within about 500 ns and disable it to a standby current of under 1 µA.
The six cascaded amplifier/limiter cells in the main path have a small signal gain of 12.
04 dB (×4), with a –3 dB bandwidth of 850 MHz, providing a total gai...


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