1 KHz To 10 GHz, 64 DB Dynamic Range Dual Log Detector/Controller
The ADL5519 is a dual-demodulating Logarithmic Amplifier It has the capability of accurately converting an RF input signal to a corresponding decibel-scaled output. The ADL5519 provides accurately scaled, independent, logarithmic outputs of both RF measurement channels. Difference output ports, which measure the difference in power between the two channels, are also available. The on-chip channel matching makes the log-amp channel difference outputs extremely stable with temperature and process variations. The device also includes a useful Temperature Sensor with an accurately scaled voltage proportional to temperature, specified over the device operating temperature range.
The ADL5519 maintains accurate log conformance for signals of 1 kHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 64 dB with linearity better than 3dB and 50 dB (re: 50 ) with error less than .5 dB. Response times of 8/10 ns (fall time/rise time) enables RF burst detection to a pulse rate beyond 50 MHz. The device provides unprecedented logarithmic slope and 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 56 mA, and it decreases to less than 1 mA when the device is disabled.
The device is capable of supplying four log-amp measurements simultaneously. Linear-in-dB measurements are provided at OUTA and OUTB, with conveniently scaled slopes of -22 mV/dB. The log-amp difference between OUTA and OUTB is available as differential or single-ended signals at OUTP and OUTN. An optional voltage applied to VLVL provides a common mode reference level to offset OUTP and OUTN above ground. On-chip wide bandwidth output op amps are used to accommodate flexible configurations that support many system solutions.
The ADL5519 CAN be easily configured to provide a control voltage to a VGA at any output pin. Since the output CAN be used for controller applications, special attention has been paid to minimize wideband noise
The ADL5519 is fabricated using a High Speed SiGe bipolar IC process and is available in 5 mm 5 mm, 32-lead LFCSP package for an operating temperature range of 40oC to +125oC.
Applications RF Power Amplifier linearization & Gain/Power control Power monitoring in Radio link transmitters Dual-channel Wireless infrastructure Radios Antenna VSWR monitor RSSI measurement in base stations, WLAN, WiMAX, Radar
Data Sheet, Rev. PrC, 7/07
By Analog Devices, Inc.
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