AD8317

Data Sheet FEATURES Wide bandwidth: 1 MHz to 10 GHz High accuracy: ±1.0 dB over temperature 55 dB dynamic range up to 8 GHz ± 3 dB error Stability over temperature: ±0.5 dB Low noise measurement/controller output, VOUT Pulse response time: 6 ns/10 ns (fall/rise) Small footprint, 2 mm × 3 mm LFCSP Supply operation: 3.0 V to 5.5 V at 22 mA Fabricated using high speed SiGe process APPLICATIONS RF transmitter PA setpoint control and level monitoring Power monitoring in radio link transmitters RSSI measurement in base stations, WLANs, WiMAX, and radars GENERAL DESCRIPTION The AD8317 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8317 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 55 dB (referenced to 50 Ω) with less than ±3 dB error. The AD8317 has 6 ns/10 ns response time (fall time/rise time) that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 μA when the dev...