The AD8309ARUZ 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 100dB and a programmable limiter output, useful from 5 to 500MHz. It is easy to use, requiring few external components. A single supply voltage of +2.7 to +6.5V at 16mA is needed, corresponding to a power consumption of under 50mW at 3V, plus the limiter bias current, determined by the application and typically 2mA, providing a limiter gain of 100dB when using 200W loads. A CMOS-compatible control interface can enable the AD8309 within about 500ns and disable it to a standby current of under 1mA. The programmable output stage provides a further 18dB of gain. The input is fully differential and presents a moderately high impedance (1kR in parallel with 2.5pF). The input-referred noise-spectral-density, when driven from a terminated 50R.
Complete multistage log-limiting IF amplifier
Programmable limiter gain and output current
ESD sensitive device, electrostatic charges as high as 4000V readily accumulate on the human body and test equipment and can discharge without detection.
