PDF AD8317 Download

Description

The AD8317 is a demodulating logarithmic amplifier, capableof 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 IC 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 (re: 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 device is disabled.

Features

1. Wide bandwidth: 1 MHz to 10 GHz
2. High accuracy: ±1.0 dB over temperature
3. 55 dB dynamic range up to 8 GHz ± 3 dB error
4. Stability over temperature: ±0.5 dB
5. Low noise measurement/controller output, VOUT
6. Pulse response time: 6 ns/10 ns (fall/rise)
7. Supply operation: 3.0 V to 5.5 V @ 22 mA
8. Fabricated using high speed SiGe process

Applications :

1. RF transmitter PA setpoint control and level monitoring
2. Power monitoring in radio link transmitters
3. RSSI measurement in base stations, WLANs, WiMAX, and radars