1 MHz TO 10 GHz, 62 dB Dual Log Detector / Controller
The ADL5519 is a dual-demodulating logarithmic amplifier that incorporates two AD8317s. It can accurately convert an RF input signal into a corresponding decibel-scaled output. The ADL5519 provides accurately scaled, independent, logarithmic output voltages for both RF measurement channels. The device has two additional output ports, OUTP and OUTN, that provide the measured differences between the OUTA and OUTB channels. The on-chip channel matching makes the log amp outputs insensitive to temperature and process variations.
The temperature sensor pin provides a scaled voltage that is proportional to the temperature over the operating temperature range of the device.
The ADL5519 maintains accurate log conformance for signals from 1 MHz to 8 GHz and provides useful operation to 10 GHz. The ±3 dB dynamic range is typically 62 dB and has a ±1 dB dynamic range of >50 dB (re: 50 Ω). The ADL5519 has a response time of 6 ns/8 ns (fall time/rise time) that enables RF burst detection to a pulse rate of greater than 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.3 V to 5.5 V is required to power the device. Current consumption is typically 60 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. The broadband output pins can support many system solutions.
Any of the ADL5519 output pins can be configured to provide a control voltage to a variable gain amplifier (VGA). Special attention has been paid to minimize the broadband noise of the output pins so that they can be used for controller applications.
The ADL5519 is fabricated on a SiGe bipolar IC process and is available in a 5 mm × 5 mm, 32-lead LFCSP with an operating temperature range of −40°C to +125°C.
- RF transmitter power amplifier linearization and 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
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
ADL5519-EVALZ is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/100 mA power supply. The 5 V power supply should be connected to the test loops labeled VPOS and GND. The two RF input signals are applied to two SMA connectors labeled INHA and INHB. Temperature compensation and power down are accessed through the SMA connectors labeled ADJA, ADJB, and PWDN. The output signals are accessible via the OUTA, OUTB, OUTN, OUTP, and SMA connectors. The temperature output, TEMP, is available via a test loop. The circuit board can also accommodate a 24-pin header through which the power supply, ground, temperature adjust nodes and output signal pins are accessible (the circuit board ships with this header not installed).
RF Source Booklet
RF IC Product Overview
Detecting Fast RF Bursts using Log Amps
by Yuping Toh, Analog Devices, Inc.
Measurement and Control of RF Power, Part I
By Eamon Nash, Analog Devices, Inc.
Make Precise Base-Station Power Measurements
(Microwaves and RF, November 2002)
Log Amps and Directional Couplers Enable VSWR Detection
by Anil Rachakonda and Larry Hawkins, Analog Devices, Inc. (RF Design, 1/1/2007)
Measuring VSWR and Gain in Wireless Systems
By Eamon Nash, Analog Devices Inc., (Microwave Journal, Nov 2005)
Measuring the RF Power in CDMA2000 and W-CDMA High Power Amplifiers (HPAs)
By Larry Hawkins, Analog Devices, Inc. (MPD Digest, Nov. 2005)
Design a Logamp RF Pulse Detector
by Eamon Nash
(Microwaves & RF, January 1, 2000)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.