LT5538 - 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
Datasheet 
DocumentationDatasheet
Reliability Data
Press Release
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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.3x3 DFN-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT5538IDD#PBF | DFN | 8 | I | $6.40 | $4.50 |
| LT5538IDD#TRPBF | DFN | 8 | I | $4.55 |
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 |