LT5575 - 800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
Features
- Input Frequency Range: 0.8GHz to 2.7GHz*
- 50Ω Single-Ended RF and LO Ports
- High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz
- High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz
- Input P1dB: 13.2dBm at 900MHz
- I/Q Gain Mismatch: 0.04dB Typical
- I/Q Phase Mismatch: 0.4° Typical
- Low Output DC Offsets
- Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz
- Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz
- Very Few External Components
- Shutdown Mode
- 16-Lead QFN 4mm × 4mm Package with Exposed Pad
Typical Application
Description
The LT5575 is an 800MHz to 2.7GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for communications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth up to 490MHz. The LT5575 incorporates balanced I and Q mixers, LO buffer amplifi ers and a precision, high frequency quadrature phase shifter. The integrated on-chip broadband transformers provide 50Ω single-ended interfaces at the RF and LO inputs. Only a few external capacitors are needed for its application in an RF receiver system.The high linearity of the LT5575 provides excellent spurfree dynamic range for the receiver. This direct conversion demodulator can eliminate the need for intermediate frequency (IF) signal processing, as well as the corresponding requirements for image filtering and IF filtering. Channel fi ltering can be performed directly at the outputs of the I and Q channels. These outputs can interface directly to channel-select filters (LPFs) or to baseband amplifiers.
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 |
|---|---|---|---|---|---|
| LT5575EUF#PBF | 4x4 QFN-16 | UF | E | 05-08-1692 | Yes |
| LT5575EUF#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 | |
|---|---|---|---|---|---|---|
| LT5575EUF#PBF | 4x4 QFN-16 | E | $11.04 | $7.75 | Yes | |
| LT5575EUF#TRPBF | 4x4 QFN-16 | E | $7.80 | 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 |
|---|---|---|---|
| DC1048A | LT5575EUF | 800MHz to 2.7GHz Direct I/Q Demodulator | $150.00 | |
| Buy Now | |||
Applications
- Cellular/PCS/UMTS Infrastructure
- RFID Reader
- High Linearity Direct Conversion I/Q 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.
