LT5538 Datasheet | Linear Technology

LT5538 40MHz to 3.8GHz RF Power Detector with 75d B Dynamic Range .. Features - - - - - - - - - DESCRIPTION The LT®5538 is a 40MHz to 3800MHz monolithic logarithmic RF power detector, capable of measuring RF signals over a wide dynamic range, from - 75d Bm to 10d Bm. The RF signal in an equivalent decibel-scaled value is precisely converted into DC voltage on a linear scale. The wide linear dynamic range is achieved by measuring the RF signal using cascaded RF limiters and RF detectors. Their outputs are summed to generate an accurate linear DC voltage proportional to the input RF signal in d Bm. The LT5538 delivers superior temperature stable output (within ±1d B over full temperature range) from 40MHz to 3.8GHz. The output is buffered with a low impedance driver. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Frequency Range: 40MHz to 3.8GHz 75d B Log Linear Dynamic Range Exceptional Accuracy over Temperature Linear DC Output vs. Input Power in d Bm - 72d Bm Detection Sensitivity Single-ended RF Input Low Supply Current: 29m A Supply Voltage: 3V to 5.25V 8-lead DFN 3mm × 3mm package APPLICATIONS - - - - - - Received Signal Strength Indication (RSSI) RF Power Measurement and Control RF/IF Power Detection Receiver RF/IF Gain Control Envelope Detection ASK Receiver TYPICAL APPLICATION 40MHz - 3.8GHz Logarithmic RF Detector 2.0 EN RF INPUT 56 1n F 1n F LT5538 ENBL IN+ IN- GND 9 OUT CAP+ CAP- VOUT (V) VCC 5538 TA01 Output Voltage and Linearity Error vs Input Power VCC = 5V AT 880 MHz 3 2 LINEARITY ERROR (d B) 1 0 - 1 TA = - 40°C TA = 25°C TA = 85°C - 5 5 5538...