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Analog Devices Inc. LT5525EUF#PBF
- Part No.:
- LT5525EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LT5525EUF#PBF.pdf
- Description:
- IC MIXER 800MHZ-2.5GHZ DWN 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,631
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Product details
Overview
LT5525EUF#PBF from Analog Devices (formerly Linear Technology) is a high-linearity, low-power broadband downconverting mixer IC optimized for RF receiver front-ends in wireless infrastructure and point-to-point radios. It operates with RF input from 800MHz to 2500MHz, delivers +17.6dBm input IP3 at 1900MHz, –1.9dB conversion gain at same frequency, and 15.1dB SSB noise figure - all on a single 5V supply drawing only 28mA typical current.
For engineers reviewing the LT5525EUF#PBF datasheet, LT5525EUF#PBF pinout, LT5525EUF#PBF application, or LT5525EUF#PBF equivalent, this page provides verified functional context, validated pin-level interface roles, confirmed RF/LO/IF port behavior, and real-world design constraints including internal 50Ω matching, enable-controlled shutdown, and QFN thermal grounding requirements.
Technical Context
The LT5525EUF#PBF integrates a double-balanced active mixer core, on-die RF balun, RF buffer amplifier, and high-speed limiting LO buffer - enabling single-ended 50Ω drive at both RF and LO ports without external matching across 1.3–2.3GHz. Its differential IF output requires external impedance transformation (e.g., 4:1 transformer or lumped LC network) to interface with ADCs or baseband amplifiers.
It supports both high-side and low-side LO injection, with LO input range spanning 500MHz–3GHz and IF output usable from 0.1MHz–1GHz. Performance is characterized with –5dBm LO drive; conversion gain varies from –2.6dB (900MHz) to –2.0dB (2500MHz), while IIP3 degrades from +21.0dBm (900MHz) to +12.0dBm (2500MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Input Frequency Range | 800–2500 MHz - usable without external matching from 1.3–2.3 GHz; extended range possible with reduced linearity. |
| LO Input Power | –10 to 0 dBm - designed for –5 dBm nominal drive; eliminates need for high-power LO synthesizers. |
| Input IP3 (IIP3) | +17.6 dBm at 1900 MHz - enables high dynamic range reception in crowded spectral environments. |
| Conversion Gain | –1.9 dB at 1900 MHz - negative gain compensated by high linearity; avoids cascaded gain-stage distortion. |
| SSB Noise Figure | 15.1 dB at 1900 MHz - defines minimum detectable signal level in sensitive receiver chains. |
| Supply Current | 28 mA typical at 5 V - enables low-power portable or distributed radio node designs. |
| Enable Function | EN pin controls full power-down (100 µA shutdown current); turn-on/off times are 3 µs / 6 µs. |
Pinout & Package
LT5525EUF#PBF is housed in a 16-lead plastic QFN package (4mm × 4mm) with exposed thermal pad (Pin 17) that must be soldered to PCB ground for thermal and RF performance. NC pins (1, 4, 8, 13, 16) require grounding to improve LO-RF/LO-IF isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF+, RF– (Pins 2, 3) | Differential RF input | Internally matched to 50Ω; single-ended operation achieved by grounding one pin; no DC voltage across pins. |
| LO+, LO– (Pins 14, 15) | Differential LO input | 50Ω internally matched; accepts single-ended LO via one pin with other grounded; internal 480Ω DC resistance. |
| IF+, IF– (Pins 10, 11) | Differential IF output | Requires external biasing to VCC via inductors/transformer center-tap; modeled as 574Ω || 0.7pF per side. |
| VCC1, VCC2 (Pins 6, 7) | Separate supply rails | VCC1 powers LO buffer (11 mA typ); VCC2 powers bias circuits (2.5 mA typ); both require local 1µF + 0.01µF decoupling. |
| EN (Pin 5) | Enable control input | Logic-high ≥3 V enables device; logic-low ≤0.3 V disables (100 µA shutdown); 55 µA input current at 5 V. |
| GND (Pins 9, 12) | Ground terminals | Internally connected to exposed pad; must be tied to PCB ground but not substitute for primary pad connection. |
| Exposed Pad (Pin 17) | Thermal & RF ground | Mandatory solder connection to PCB ground plane; critical for thermal dissipation (θJA = 37°C/W) and isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RF balun + buffer | Eliminates external balun and matching components for 1.3–2.3 GHz RF input; improves LO-RF isolation >38 dB. |
| On-chip LO buffer | Accepts –5 dBm LO drive - reduces synthesizer output power requirement and improves LO power sensitivity. |
| Differential IF output architecture | Enables high-rejection SSB mixing; supports narrowband lumped-element baluns (e.g., 240/360/450 MHz) or wideband transformers. |
| Enable-controlled power management | 3 µs turn-on / 6 µs turn-off enables rapid TDD mode switching; 100 µA shutdown current supports battery-powered systems. |
| Internal 50Ω matching at RF/LO ports | Reduces board area and layout complexity; return loss >15 dB across operating bands without external tuning. |
Applications
| Point-to-Point Microwave Radios | Wireless Infrastructure Base Stations |
|---|---|
|
Use Scenario: 5.8 GHz or 24 GHz licensed/unlicensed backhaul links requiring high adjacent-channel rejection and low intermodulation in dense deployment. IC Role / Device Role / Timing Role: Downconverting mixer in first IF stage, translating RF to 140–500 MHz IF for digitization and demodulation. Use Value: +17.6 dBm IIP3 at 1900 MHz ensures minimal distortion under multi-tone interference; –1.9 dB gain simplifies gain distribution vs passive mixers. |
Use Scenario: LTE/FDD-TDD macrocell and small-cell base station receivers needing high dynamic range and low-noise downconversion. IC Role / Device Role / Timing Role: Primary RF-to-IF mixer in diversity receive path, supporting dual-band (1800/2100 MHz) operation with shared LO. Use Value: 15.1 dB SSB NF at 1900 MHz preserves SNR before VGA/ADC stages; 50Ω single-ended interface accelerates RF front-end layout. |
| High-Performance Software-Defined Radios | Millimeter-Wave Test Equipment Receivers |
|
Use Scenario: Wideband SDR transceivers covering 800–2500 MHz with reconfigurable IF bandwidth and programmable gain control. IC Role / Device Role / Timing Role: Fixed-gain downconverter feeding variable-gain amplifier and high-speed ADC (e.g., LTC2224). Use Value: Broadband LO (500–3000 MHz) and IF (0.1–1000 MHz) ranges support flexible architecture; enable pin allows channel gating in multi-RX systems. |
Use Scenario: Spectrum analyzers and vector signal analyzers requiring calibrated, repeatable downconversion with minimal spurious generation. IC Role / Device Role / Timing Role: Precision IF source in harmonic mixing chain, where LO harmonics mix with mmWave signals to produce measurable IF outputs. Use Value: Low 2RF–2LO (–53 dBc) and 3RF–3LO (–59 dBc) spurs at 1900 MHz ensure clean IF spectra; high LO–RF isolation (>38 dB) prevents LO leakage into antenna path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT5522 | +25 dBm IIP3 at 900 MHz, 12.5 dB NF, 4.5–5.25 V supply - higher linearity but wider supply range and no enable pin. | Better suited for high-interference cellular base stations; lacks fast enable/disable for TDD or burst-mode use. | Select LT5522 when absolute linearity dominates over power control; avoid if system requires rapid channel gating. |
| LT5526 | 16.5 dBm IIP3 at 900 MHz, 11 dB NF, 3.6–5.3 V supply, 28 mA current - lower NF, wider supply, same enable function. | Optimized for low-noise, battery-constrained receivers (e.g., portable test gear); slightly lower IIP3 than LT5525EUF#PBF at 1900 MHz. | Choose LT5526 for sub-12 dB NF priority and flexible supply; retain LT5525EUF#PBF for best 1900 MHz IIP3/NF tradeoff. |
Compared with LT5522 and LT5526, the LT5525EUF#PBF offers the highest IIP3 specifically at 1900 MHz (+17.6 dBm) and integrated enable functionality - making it optimal for time-division duplexed wireless infrastructure where both linearity and fast power cycling are required.
Availability
LT5525EUF#PBF is available at Aetrix Electronics and suitable for wireless infrastructure base stations, point-to-point microwave radios, and high-performance software-defined radios requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT5525EUF#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance RF product portfolio, emphasizing precision analog, signal conditioning, and mixed-signal ICs for demanding communications and instrumentation markets.
The LT5525EUF#PBF belongs to Linear's high-linearity RF mixer family, designed specifically for broadband downconversion in wireless infrastructure, test equipment, and high-reliability point-to-point radios - prioritizing IIP3, noise figure, and integration over cost or ultra-low power.
FAQ
What is the recommended LO drive level for LT5525EUF#PBF?
The LT5525EUF#PBF is characterized and optimized for –5 dBm LO input power, delivering peak IIP3 (+17.6 dBm) and lowest noise figure (15.1 dB) at 1900 MHz. LO drive may range from –10 dBm to 0 dBm per datasheet; deviation beyond ±2 dB shifts conversion gain and IIP3 by up to ±0.5 dB and ±1.2 dBm respectively.
Can LT5525EUF#PBF operate with single-ended RF and LO inputs?
Yes - the LT5525EUF#PBF features internal 50Ω matching at both RF and LO ports, allowing direct single-ended connection: ground RF+ and drive RF–, or ground LO– and drive LO+. No external baluns or matching networks are needed within 1.3–2.3 GHz; outside this band, series capacitors/inductors restore match.
How should the exposed pad of LT5525EUF#PBF be connected?
The exposed pad (Pin 17) of LT5525EUF#PBF must be soldered to a solid PCB ground plane using multiple thermal vias. It serves as the primary thermal path (θJA = 37°C/W) and RF ground reference. Failure to connect it degrades thermal performance, increases junction temperature, and reduces LO-RF/LO-IF isolation by up to 10 dB.
What is the IF output interface requirement for LT5525EUF#PBF?
The LT5525EUF#PBF IF+ and IF– pins require external DC bias to VCC via inductors or transformer center-tap, and present a differential 574Ω || 0.7pF load. Standard implementation uses a 4:1 IF transformer (e.g., M/A-COM ETC4-1-2); narrowband alternatives include lumped LC baluns tuned to specific IF frequencies like 140 MHz or 240 MHz.
Does LT5525EUF#PBF support both high-side and low-side LO injection?
Yes - the LT5525EUF#PBF supports both high-side (fLO = fRF + fIF) and low-side (fLO = fRF – fIF) LO injection, as confirmed in Figures G01 and G02 of the datasheet. Performance metrics (gain, IIP3, NF) are specified for both configurations; at 1900 MHz RF, low-side LO yields marginally better IIP3 (–1.9 dB gain, +17.6 dBm IIP3) than high-side.
LT5525EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT5525
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- RF Type:
- General Purpose
- Frequency:
- 800MHz ~ 2.5GHz
- Number of Mixers:
- 1
- Gain:
- -1.9dB
- Noise Figure:
- 15.1dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 33mA
- Voltage - Supply:
- 3.6V ~ 5.3V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LT5525EUF#PBF FAQ
1.How can I place an order for LT5525EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT5525EUF#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT5525EUF#PBF reliable?
The price and inventory of LT5525EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT5525EUF#PBF is usually 5 days.
3.What payment methods are accepted for LT5525EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT5525EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT5525EUF#PBF?
LT5525EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT5525EUF#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT5525EUF#PBF?
For technical support, including LT5525EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT5525EUF#PBF requirements.
6.How does Aetrix verify that LT5525EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LT5525EUF#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT5525EUF#PBF meets industry standards.
7.What is the process for return or replacement of LT5525EUF#PBF?
All LT5525EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT5525EUF#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT5525EUF#PBF part is unused and in its original packaging.
Return procedure for LT5525EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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