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Analog Devices Inc. LTC5544IUF#TRPBF
- Part No.:
- LTC5544IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC5544IUF#TRPBF.pdf
- Description:
- IC MIXER DOWN CONVERTER 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,184
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Product details
Overview
LTC5544IUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-dynamic-range passive downconverting mixer optimized for 4GHz–6GHz RF input and 4.2GHz–5.8GHz LO operation, delivering 7.4dB conversion gain, 25.9dBm IIP3, and 11.3dB noise figure at 5250MHz - used in WiMAX/WLAN receivers with 240MHz IF output.
For engineers reviewing the LTC5544IUF#TRPBF datasheet, LTC5544IUF#TRPBF pinout, LTC5544IUF#TRPBF application, or LTC5544IUF#TRPBF equivalent, key selection criteria include LO drive sensitivity (+2dBm typical), differential IF output impedance (332Ω||1.7pF at 240MHz), shutdown control (0.3V/3.0V logic), thermal sensing diode (TEMP pin), and 16-lead 4mm×4mm QFN package with exposed ground pad.
Technical Context
The LTC5544IUF#TRPBF integrates a double-balanced passive mixer core, LO buffer amplifier, IF differential amplifier, and bias/shutdown circuitry. It supports both low-side and high-side LO injection, with RF and LO inputs single-ended and IF output differential.
Its RF input uses an integrated transformer with center-tap (CT pin) for LO leakage tuning; LO input employs a two-stage limiting amplifier optimized for 4.2–5.8GHz; IF amplifier allows dual supply (3.3V or 5V) to trade power consumption for +3.2dB P1dB improvement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 4GHz to 6GHz - defines usable input band for wireless infrastructure and radar front-ends |
| LO Frequency Range | 4.2GHz to 5.8GHz - sets required synthesizer tuning range for downconversion |
| Conversion Gain | 7.4dB at 5250MHz - enables direct connection to ADC without intermediate amplification |
| IIP3 | 25.9dBm at 5250MHz - ensures robust linearity against adjacent-channel interferers in dense RF environments |
| Noise Figure | 11.3dB SSB at 5250MHz - determines minimum detectable signal level in receiver chain |
| IF Output Bandwidth | Up to 1GHz - supports wideband modulation schemes including OFDM and ultra-wideband signals |
| Supply Voltage | VCC = 3.3V (mixer/LO), VCCIF = 3.3V or 5V (IF amp) - enables flexible power architecture with P1dB boost at 5V |
| Shutdown Current | 500µA - allows rapid power gating in time-division systems without external switches |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 17), rated for –40°C to 105°C case temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 11, 17) | Ground reference | Multiple dedicated ground pins plus exposed pad ensure low-inductance RF grounding and thermal dissipation |
| RF (Pin 2) | Single-ended RF input | Internally connected to primary of integrated transformer; requires DC-blocking capacitor due to internal DC path to ground |
| CT (Pin 3) | RF transformer center-tap | Provides access to secondary center point for LO leakage suppression via tunable bypass capacitor (e.g., 0.4–1pF) |
| SHDN (Pin 4) | Shutdown control | Active-low enable: <0.3V = on, >3.0V = off; input current <10µA; must not float |
| VCC1/VCC2 (Pins 5, 7) | Mixer & LO buffer supply | Internally tied; supplies 96mA typical at 3.3V; requires local 1µF + 22pF decoupling |
| LOBIAS (Pin 6) | LO amplifier bias adjust | Open-circuit for nominal 4mA bias current; optional resistor to ground reduces LO current for power optimization |
| LO (Pin 10) | Single-ended LO input | Drives internal limiting amplifier; matched with 1.2pF series capacitor; accepts +2dBm ±3dB drive |
| TEMP (Pin 12) | Digital temperature sensor anode | Diode-connected node; 726mV @25°C, –1.73mV/°C slope; enables die temperature monitoring |
| IFGND (Pin 13) | IF amplifier ground return | DC return path for 98mA IF amplifier current; must be connected to ground for proper biasing |
| IF+/IF– (Pins 14, 15) | Differential IF outputs | Open-collector; require external bias (via inductors or transformer center-tap) and impedance matching to 50Ω |
| IFBIAS (Pin 16) | IF amplifier bias adjust | Open-circuit for full 98mA IF current; adding resistor reduces current and trades P1dB/IIP3 for lower power |
Key Features
| Feature | Design Value |
|---|---|
| High dynamic range architecture | 25.9dBm IIP3 + 11.3dB NF at 5250MHz enables coexistence in congested 5GHz bands |
| Dual-supply IF amplifier | VCCIF selectable between 3.3V and 5V - increases P1dB by 3.2dB without changing layout |
| Integrated LO buffer | Accepts +2dBm LO drive with ±3dB tolerance - eliminates need for external LO amplifier in many designs |
| On-chip temperature sensing | TEMP pin provides calibrated diode output (726mV @25°C, –1.73mV/°C) for system thermal management |
| Low-side/high-side LO flexibility | Supports both fLO = fRF – fIF and fLO = fRF + fIF configurations - simplifies frequency planning across bands |
| RF/LO transformer integration | Eliminates external baluns; CT pin enables fine-tuning of LO-to-RF leakage below –30dBm |
Applications
| 5GHz WiMAX/WLAN Receiver | 4.9GHz Public Safety Bands |
|---|---|
Use Scenario: Base station or CPE receiver operating in 5.15–5.35GHz unlicensed band with 240MHz IF output. IC Role / Device Role / Timing Role: Downconverting mixer converting RF to baseband-compatible IF while preserving EVM and ACLR performance. Use Value: 7.4dB conversion gain and 25.9dBm IIP3 maintain SNR and linearity under multi-tone interference per IEEE 802.16e. | Use Scenario: Mobile radio transceiver in 4.94–4.99GHz public safety spectrum requiring high selectivity and low phase noise impact. IC Role / Device Role / Timing Role: Front-end mixer providing image-reject downconversion with >38dB RF-to-LO isolation. Use Value: –30dBm LO-to-RF leakage and >29dB RF-to-IF isolation prevent self-desensitization in half-duplex operation. |
| 4.9GHz to 6GHz Military Communications | Radar Systems |
Use Scenario: Secure SATCOM terminal operating across extended 4.9–6GHz band with programmable LO synthesis. IC Role / Device Role / Timing Role: Wideband mixer supporting frequency-hopping waveforms with fast LO switching and stable gain flatness (±0.15dB). Use Value: 7.4dB gain flatness over 60MHz bandwidth and –40°C to 105°C operation ensure reliability in airborne platforms. | Use Scenario: Pulse-Doppler radar front-end requiring wide instantaneous bandwidth and high spurious-free dynamic range. IC Role / Device Role / Timing Role: First-stage mixer translating X-band RF to IF with minimal added noise and distortion. Use Value: –77dBc 3RF–3LO spurious and 11.3dB NF preserve target detection sensitivity in clutter-limited environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC1040LP4CE | Wider RF range (3–8GHz), higher P1dB (+16.5dBm), but no integrated IF amplifier or TEMP pin | Requires external IF buffer and temperature monitoring circuitry; better suited for discrete IF chain designs | Select when maximum RF bandwidth and P1dB outweigh integration benefits of LTC5544IUF#TRPBF |
| ADL5802ACPZ-R7 | Lower frequency range (100MHz–6GHz), integrated LO doubler, no IF amplifier, smaller 3mm×3mm package | Lacks IF gain stage and thermal sensing; requires external IF amplification and temperature compensation | Select when board space is critical and IF amplification is already provided elsewhere in signal chain |
Compared with HMC1040LP4CE and ADL5802ACPZ-R7, the LTC5544IUF#TRPBF uniquely combines integrated IF amplification, on-die temperature sensing, and optimized 4–6GHz performance - reducing BOM count and enabling compact, thermally aware receiver designs without external gain stages.
Availability
LTC5544IUF#TRPBF is available at Aetrix Electronics and suitable for 5GHz WiMAX/WLAN receivers, 4.9GHz public safety radios, and military communications systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC5544IUF#TRPBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving communications, industrial, automotive, and aerospace markets.
The LTC5544IUF#TRPBF belongs to ADI's high-dynamic-range RF mixer product line, designed specifically for demanding wireless infrastructure and defense applications where linearity, noise, and integration are critical.
FAQ
What is the recommended LO drive level for optimal performance of the LTC5544IUF#TRPBF?
The LTC5544IUF#TRPBF is optimized for +2dBm LO drive across its 4.2–5.8GHz range, with acceptable performance from –1dBm to +5dBm. At +2dBm, it achieves 7.4dB conversion gain, 25.9dBm IIP3, and 11.3dB noise figure at 5250MHz. Deviations beyond ±3dB reduce linearity and increase spurious content, so maintaining +2dBm ±1dB is advised for production designs using the LTC5544IUF#TRPBF.
Can the LTC5544IUF#TRPBF operate with both low-side and high-side LO injection?
Yes, the LTC5544IUF#TRPBF supports both low-side LO (fLO = fRF – fIF) and high-side LO (fLO = fRF + fIF) configurations. For low-side LO, RF range is 4.2–6.0GHz with IF up to 1GHz; for high-side LO, RF range is 4.0–5.8GHz. Performance metrics such as conversion gain, IIP3, and NF are characterized separately for each mode in the datasheet, and the LTC5544IUF#TRPBF requires no hardware change to switch between them.
How does the IF amplifier supply voltage affect RF performance in the LTC5544IUF#TRPBF?
Raising VCCIF from 3.3V to 5V increases the LTC5544IUF#TRPBF's RF input P1dB by 3.2dB (from 11.4dBm to 14.6dBm at 5250MHz) with only marginal degradation in IIP3 (+0.6dB) and NF (+0.1dB). This allows improved blocking immunity in high-interference environments. The LTC5544IUF#TRPBF draws 98mA at 3.3V and 101mA at 5V, making the trade-off between linearity and power consumption design-dependent.
What is the function of the CT (center-tap) pin on the LTC5544IUF#TRPBF?
The CT pin (Pin 3) connects to the center-tap of the internal RF transformer secondary winding. It enables external tuning of LO-to-RF leakage - adding a small capacitor (e.g., 0.4–1pF) between CT and ground reduces LO feedthrough below –30dBm. The LTC5544IUF#TRPBF's nominal CT DC voltage is 1.2V, and the capacitor must be placed within 2mm of Pin 3 for effective high-frequency decoupling.
Does the LTC5544IUF#TRPBF require external matching components for 50Ω RF and LO interfaces?
Yes, the LTC5544IUF#TRPBF requires external matching: a 0.6pF series capacitor (C1) and 2.2nH shunt inductor (L4) for RF input; a 1.2pF series capacitor (C3) for LO input. These components establish 50Ω broadband match across the specified frequency bands. The datasheet provides measured return loss plots and impedance tables (e.g., Table 1 and Table 2) confirming match validity for the LTC5544IUF#TRPBF when these values are used.
LTC5544IUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- RF Type:
- WiMax, WLAN
- Frequency:
- 4GHz ~ 6GHz
- Number of Mixers:
- 1
- Gain:
- 7.4dB
- Noise Figure:
- 11.3dB
- Secondary Attributes:
- -
- Current - Supply:
- 194mA
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LTC5544IUF#TRPBF FAQ
1.How can I place an order for LTC5544IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5544IUF#TRPBF 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 LTC5544IUF#TRPBF reliable?
The price and inventory of LTC5544IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5544IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC5544IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5544IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5544IUF#TRPBF?
LTC5544IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5544IUF#TRPBF 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 LTC5544IUF#TRPBF?
For technical support, including LTC5544IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5544IUF#TRPBF requirements.
6.How does Aetrix verify that LTC5544IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC5544IUF#TRPBF 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 LTC5544IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC5544IUF#TRPBF?
All LTC5544IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5544IUF#TRPBF, 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 LTC5544IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC5544IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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