LT5557 - 400MHz to 3.8GHz 3.3V High Linearity Downconverting RF Mixer
Features
- Wide RF Frequency Range: 400MHz to 3.8GHz*
- High Input IP3: 25.6dBm at 900MHz
24.7dBm at 1950MHz
23.7dBm at 2.6GHz - Conversion Gain: 3.3dB at 900MHz
2.9dB at 1950MHz - –3dBm LO Drive Level
- Low LO Leakage
- Low Noise Figure: 10.6dB at 900MHz
11.7dB at 1950MHz - Low Power: 3.3V/269mW
- 50Ω Single-Ended RF and LO Ports
- Very Few External Components
- 16-Lead (4mm × 4mm) QFN Package
Typical Application
Description
The LT5557 active mixer is optimized for high linearity, wide dynamic range downconverter applications. The IC includes a high speed differential LO buffer amplifier driving a double-balanced mixer. Broadband, integrated transformers on the RF and LO inputs provide singleended 50Ω interfaces. The differential IF output allows convenient interfacing to differential IF filters and amplifiers, or is easily matched to drive a single-ended 50Ω load, with or without an external transformer.
The RF input is internally matched to 50Ω from 1.6GHz to 2.3GHz, and the LO input is internally matched to 50Ω from 1GHz to 5GHz. The frequency range of both ports is easily extended with simple external matching. The IF output is partially matched and usable for IF frequencies up to 600MHz.
The LT5557’s high level of integration minimizes the total solution cost, board space and system-level variation.
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 |
|---|---|---|---|---|---|
| LT5557EUF#PBF | 4x4 QFN-16 | UF | E | 05-08-1692 | Yes |
| LT5557EUF#TRPBF | 4x4 QFN-16 | UF | E | 05-08-1692 | 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 | |
|---|---|---|---|---|---|---|
| LT5557EUF#PBF | 4x4 QFN-16 | E | $8.48 | $5.95 | Yes | |
| LT5557EUF#TRPBF | 4x4 QFN-16 | E | $6.00 | 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 |
|---|---|---|---|
| DC1131A | LT5557EUF | 400MHz to 3.8GHz 3.3V Down Mixer, 1.95GHz RFin, 240MHz balun IF out. | $125.00 | |
| DC910A | LT5557EUF | 400MHz to 3.8GHz down mixer, 1.95GHz RFin, 240MHz discrete matching IF | $125.00 | |
| Buy Now | |||
Applications
- Cellular, CDMA, WCDMA, TD-SCDMA and UMTS Infrastructure
- WiMAX
- Wireless Infrastructure Receiver
- Wireless Infrastructure PA Linearization
- 900MHz/2.4GHz/3.5GHz WLAN
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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.
