AD8309ARUZ

Overview

The AD8309ARUZ is a complete IF limiting amplifier and logarithmic converter by Analog Devices Inc. It provides a 100 dB dynamic range RSSI output with a typical slope of 20 mV/dB and an intercept of -95 dBm (re 50 Ω). The device features a limiter output usable from 5 MHz to 500 MHz, with a small-signal bandwidth of 3.5 MHz for the log amp section. It operates on a single supply voltage ranging from +2.7 V to +6.5 V, drawing a typical quiescent current of 16 mA. The input impedance is 1 kΩ in parallel with 2.5 pF.

Feature Summary

• Integrates a six-stage cascaded amplifier chain with full-wave detectors to achieve high dynamic range signal measurement.
• Provides a programmable limiter output stage capable of delivering differential signals up to 10 mA.
• Features a CMOS-compatible enable interface that allows rapid power-up and low-current standby modes.
• Utilizes band-gap reference circuitry to maintain stable RSSI scaling parameters across temperature variations.

Applications

• Receiver Signal Strength Indication (RSSI) systems
• Frequency and phase modulation receivers
• Very wide range IF and RF power measurement
• Low cost radar and sonar signal processing

Procurement Notes

Verify the specific package variant RU-16 against the design requirements. Confirm the industrial temperature range specifications (-40°C to +85°C) align with the operational environment. Ensure the single-supply voltage constraints are met within the system architecture before finalizing procurement.

Selection Notes

Select this component when a combined limiting amplifier and logarithmic detector is required for IF signals. Consider the 1 kΩ input impedance which may necessitate external matching networks for 50 Ω sources. Evaluate the need for the limiter output functionality versus standalone RSSI applications to optimize system complexity.

Part Context

This part belongs to the AD8309 series of demodulating logarithmic amplifiers. It is designed for applications requiring both signal limiting and precise magnitude detection. The device utilizes silicon-on-insulator isolation techniques on an advanced complementary bipolar process to ensure performance stability.

Replacement Considerations

Public confirmed substitute part numbers: None identified in official documentation.