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

Manufactured by:


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.


  • 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


    checked 量产




    X +



    本页提供1 MHz至10 GHz、50 dB对数检波器/控制器AD8317的评估板文档和订购信息。


    X +



    X +
    AD8317 配套产品

    推荐 Low-Noise Voltage Regulators

    • For a fixed 3V, 300mA low dropout regulator ,我们建议 ADP7102 .
    • For a fixed 3V, 150mA low dropout regulator ,我们建议 ADP150 .


    X +


    X +



    AD8317 材料声明
    PCN-PDN信息 质量和可靠性 原理图符号和PCB封装






    购买评估板 所示报价为单片价格