LT5538IDD#PBF Analog Devices

LINEARITY ERROR (dB) LT5538 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range FEATURES DESCRIPTION Frequency Range: 40MHz to 3.8GHz The LT 5538 is a 40MHz to 3800MHz monolithic logarith- 75dB Log Linear Dynamic Range mic RF power detector, capable of measuring RF signals Exceptional Accuracy over Temperature over a wide dynamic range, from 75dBm to 10dBm. The Linear DC Output vs. Input Power in dBm RF signal in an equivalent decibel-scaled value is precisely 72dBm Detection Sensitivity converted into DC voltage on a linear scale. The wide linear Single-ended RF Input dynamic range is achieved by measuring the RF signal us- Low Supply Current: 29mA ing cascaded RF limiters and RF detectors. Their outputs Supply Voltage: 3V to 5.25V are summed to generate an accurate linear DC voltage 8-lead DFN 3mm 3mm package proportional to the input RF signal in dBm. The LT5538 delivers superior temperature stable output (within 1dB over full temperature range) from 40MHz to 3.8GHz. The APPLICATIONS output is buffered with a low impedance driver. Received Signal Strength Indication (RSSI) , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. RF Power Measurement and Control RF/IF Power Detection Receiver RF/IF Gain Control Envelope Detection ASK Receiver TYPICAL APPLICATION Output Voltage and Linearity Error 40MHz - 3.8GHz Logarithmic RF Detector vs Input Power 2.0 3 V = 5V AT 880 MHz CC LT5538 EN ENBL OUT V OUT 1.7 2 RF + + IN CAP INPUT 1nF IN CAP 1.4 1 56 1nF GND V 5V CC 1.1 0 5538 TA01 9 0.1F 100pF 0.8 1 T = 40C 0.5 A 2 T = 25C A T = 85C A 0.2 3 75 65 55 45 35 25 15 5 5 INPUT POWER (dBm) 5538 TA02 5538f 1 V (V) OUTLT5538 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Power Supply Voltage ..............................................5.5V Enable Voltage .....................................0.3V, V + 0.3V CC ENBL 1 8 OUT RF Input Power ....................................................15dBm + + IN CAP 2 7 Operating Ambient Temperature ............ 40C to +85C IN 3 6 CAP Storage Temperature Range ................. 65C to +125C GND 4 5 V CC Maximum Junction Temperature........................... 150C DD PACKAGE 8-LEAD (3mm 3mm) PLASTIC DFN = 43C/W JA EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT5538IDD PBF LT5538IDD TRPBF LCVG 8-Lead (3mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: