AD8317 - 1 MHz to 10 GHz , 50 dB Log Detector/Controller

AD8317是AD公司的一款RF功率检波器产品，AD8317是1 MHz to 10 GHz , 50 dB Log Detector/Controller，本站介绍了AD8317的封装应用图解、特点和优点、功能等，并给出了与AD8317相关的AD元器件型号供参考。

AD8317 - 1 MHz to 10 GHz , 50 dB Log Detector/Controller - RF功率检波器 - 非RMS响应功率检波器 - Analog Devices

产品描述

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 50 dB (re: 50 Ω) with error less than ±1 dB. The AD8317 has 8 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.

The AD8317 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention has been paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin.

The feedback loop through an RF amplifier is closed via VOUT, the output of which regulates the output of the amplifier to a magnitude corresponding to VSET. The AD8317 provides 0 V to (VPOS ? 0.1 V) output capability at the VOUT pin, suitable for controller applications. As a measurement device, VOUT is externally connected to VSET to produce an output voltage VOUT that is a decreasing linear-in-dB function of the RF input signal amplitude.

The logarithmic slope is ?22 mV/dB, determined by the VSET interface. The intercept is 15 dBm (re: 50 Ω, CW input) using the INHI input. These parameters are very stable against supply and temperature variations.

The AD8317 is fabricated on a SiGe bipolar IC process and is available in a 2 mm × 3 mm, 8-lead LFCSP with an operating temperature range of ?40°C to +85°C.

Applications

RF transmitter PA setpoint control and level monitoring

Power monitoring in radiolink transmitters

RSSI measurement in base stations, WLANs, WiMAX, and radars

Data Sheet, Rev. A, 8/07

优势和特点

Wide bandwidth: 1 MHz to 10 GHz

High accuracy: ±1.0 dB over temperature

50 dB dynamic range up to 8 GHz

Stability over temperature: ±0.5 dB

Low noise measurement/controller output VOUT

Pulse response time: 8 ns/10 ns (fall/rise)

Small footprint, 2 mm × 3 mm LFCSP

Supply operation: 3.0 V to 5.5 V @ 22 mA

Fabricated using high speed SiGe process