Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | Logarithmic RF detector/controller |
| Frequency range | 1 MHz to 8 GHz |
| Accurate conformance | 1 MHz to 6 GHz |
| Typical input range | 60 dB with <±1 dB error in documented range |
| Fast response | 10 ns / 12 ns fall/rise |
| Temperature sensor | Integrated, 2 mV/°C |
| Supply | 5 V at 68 mA |
| Package | 16-lead LFCSP, 4 × 4 mm |
Product Overview
The AD8318ACPZ-REEL7 is the tape-and-reel 16-lead LFCSP implementation of Analog Devices’ wide-dynamic-range logarithmic detector/controller. It maintains accurate log conformance from 1 MHz to 6 GHz and remains useful to 8 GHz, supporting RF power measurement and closed-loop amplifier control.
Compared with the smaller AD8317, the AD8318 emphasizes wider high-accuracy dynamic range and includes a temperature-sensor output. Analog Devices specifies a typical 60 dB input range with less than ±1 dB error in the documented operating region and a 2 mV/°C temperature-sensor slope, which can support additional system monitoring or calibration.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Detector type | Demodulating logarithmic amplifier |
| Frequency range | 1 MHz to 8 GHz |
| Accurate log conformance | 1 MHz to 6 GHz |
| Typical input range | 60 dB with <±1 dB error in documented range |
| Feature accuracy | ±1 dB over 55 dB for f <5.8 GHz |
| Pulse response | 10 ns / 12 ns fall/rise |
| Temperature sensor slope | 2 mV/°C |
| Supply voltage | 5 V |
| Typical current | 68 mA |
| Disabled power | <1.5 mW |
| Package | 16-lead LFCSP, 4 × 4 × 0.75 mm with exposed pad |
| Family guidance | Recommended for new designs |
Design Considerations
The temperature-sensor output provides a way to monitor local device temperature, but it does not automatically compensate the RF measurement. If tighter accuracy is required, use the detector’s frequency/temperature calibration behavior together with the temperature signal in the system calibration strategy.
The AD8318’s 68 mA current is significantly higher than many lower-frequency detectors. That power budget and the 4 × 4 mm exposed-pad package should be included in thermal design, especially when the detector is continuously enabled in a sealed RF module.
Related Engineering Resources
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