The AD8307 is a low cost DC-500MHz, 92dB logarithmic amplifier. It features a complete multistage logarithmic amplifier, 92dB dynamic range, single supply operation of 2.7V, and can be powered up in 100ns.
The AD8307 is a complete 500 MHz monolithic logarithmic amplifier offered in an 8‑lead SO‑8 package. It provides a 92 dB dynamic range from –75 dBm to +17 dBm, operates from a single 2.7 V–5.5 V supply, and features a fully differential input with high impedance.
Key specifications include a 100 ns power‑up time, 400 ns small‑signal response, 500 MHz upper usable frequency, 10 Hz lower usable frequency, and a logarithmic slope of about 25 mV/dB. The device is supplied in industrial temperature grades (‑40 °C to +85 °C) and is suited for applications such as RSSI, antenna power measurement, radar/sonar processing, and spectrum analysis.
| Dynamic Range | 92 dB (‑75 dBm to +17 dBm) |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V |
| Supply Current | 8 – 10 mA |
| Power‑Up Time | 100 ns |
| Upper Usable Frequency | 500 MHz |
| Lower Usable Frequency | 10 Hz |
| Logarithmic Slope | ≈25 mV/dB |
| Logarithmic Intercept | 20 pV |
| Input Noise Spectral Density | 1.5 nV/√Hz |
| Output Resistance (Pin 4) | 12.5 kΩ |
| Internal Load Capacitance | 3.5 pF |
| Small‑Signal Response Time (10‑90 %) | 400 ns |
It operates from a single supply of 2.7 V to 5.5 V.
The device provides a 92 dB dynamic range from –75 dBm to +17 dBm.
The AD8307 employs six cascaded amplifier/limiter cells.
It is available for industrial use from –40 °C to +85 °C.