LT5538 - 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
Features
- Frequency Range: 40MHz to 3.8GHz
- 75dB Log Linear Dynamic Range
- Exceptional Accuracy over Temperature
- Linear DC Output vs. Input Power in dBm
- -72dBm Detection Sensitivity
- Single-ended RF Input
- Low Supply Current: 29mA
- Supply Voltage: 3V to 5.25V
- 8-lead DFN 3mm × 3mm package
Typical Application
Description
The LT5538 is a 40MHz to 3800MHz monolithic logarithmic RF power detector, capable of measuring RF signals over a wide dynamic range, from -75dBm to 10dBm. 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 dBm. The LT5538 delivers superior temperature stable output (within ±1dB over full temperature range) from 40MHz to 3.8GHz. The output is buffered with a low impedance driver.Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT5538IDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LT5538IDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT5538IDD#PBF | 3x3 DFN-8 | I | $6.40 | $4.50 | Yes | |
| LT5538IDD#TRPBF | 3x3 DFN-8 | I | $4.55 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1120A | LT5538IDD | 40MHz to 3.8GHz 75dB Dynamic Range Log Detector. Board optimized for 40MHz to 2.7GHz. Call Factory for higher freq. | $100.00 | |
| Buy Now | |||
Applications
- Received Signal Strength Indication (RSSI)
- RF Power Measurement and Control
- RF/IF Power Detection
- Receiver RF/IF Gain Control
- Envelope Detection
- ASK Receiver
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
