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Analog Devices Inc. LTC5543IUH#TRPBF
- Part No.:
- LTC5543IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
LTC5543IUH#TRPBF.pdf
- Description:
- IC MIXER 2.3-4GHZ 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,478
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Product details
Overview
LTC5543IUH#TRPBF from Analog Devices (acquired Linear Technology) is a high-dynamic-range passive downconverting mixer IC optimized for 2.3GHz–4GHz RF input and 2.4GHz–3.6GHz LO operation. It delivers 8.4dB conversion gain, 24.5dBm IIP3, and 10.2dB noise figure at 2500MHz, with integrated SPDT LO switch, IF amplifier, and shutdown control - deployed in LTE/WiMAX base station receivers requiring high linearity and wideband selectivity.
For engineers reviewing the LTC5543IUH#TRPBF datasheet, LTC5543IUH#TRPBF pinout, LTC5543IUH#TRPBF application, or LTC5543IUH#TRPBF equivalent, key selection criteria include RF/LO frequency alignment, dual-supply IF biasing (3.3V/5V), LO switching time (<50ns), shutdown current (<500μA), and 20-lead 5mm × 5mm QFN thermal management.
Technical Context
The LTC5543IUH#TRPBF integrates a double-balanced passive mixer core, differential IF amplifier with open-collector outputs, and a high-isolation SPDT LO switch controlled by LOSEL. Its RF input uses an internal transformer with center-tap (CT) bias at 1.2V, while LO inputs are 50Ω-matched across 2.4–3.6GHz even during shutdown.
It supports both high-side (fLO = fRF + fIF) and low-side (fLO = fRF – fIF) injection, with IF output bandwidth spanning 5–600MHz. Conversion gain flatness is ±0.1dB over 60MHz bandwidth at 2500MHz RF, and temperature drift is –0.007dB/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 2.3GHz to 4GHz - defines usable signal band for cellular/WiMAX front-end receivers |
| LO Frequency Range | 2.4GHz to 3.6GHz - constrains synthesizer design; requires ≥0dBm drive level |
| Conversion Gain | 8.4dB at 2500MHz - enables direct interfacing with ADCs without additional IF gain stages |
| IIP3 | 24.5dBm at 2500MHz - supports strong adjacent-channel blocker rejection in dense RF environments |
| Noise Figure | 10.2dB at 2500MHz - sets minimum detectable signal floor in high-selectivity receiver chains |
| Supply Voltage | VCC = 3.3V (mixer/LO), VCCIF = 3.3V or 5V (IF amp) - higher IF supply increases P1dB to 13.9dBm |
| Shutdown Current | <500μA - enables power cycling in TDD systems without PCB-level rework |
Pinout & Package
The LTC5543IUH#TRPBF is housed in a 20-lead 5mm × 5mm plastic QFN (UH package) with exposed thermal pad (Pin 21) soldered to PCB ground. The package provides θJA = 34°C/W and supports high-power RF operation up to 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF (Pin 2) | Single-ended RF input | Internally connected to primary of RF transformer; requires DC-blocking capacitor; 50Ω matched only when selected LO is driven |
| CT (Pin 3) | RF transformer secondary center-tap | Bias voltage = 1.2V; bypass capacitor required for LO-frequency-dependent decoupling |
| SHDN (Pin 5) | Shutdown control | Logic low (≤0.3V) enables device; logic high (≥3V) reduces supply current to <500μA |
| LO1 / LO2 (Pins 11, 15) | Single-ended LO inputs | 50Ω matched even during shutdown; LOSEL selects active path; each draws ~90mA when enabled |
| IF+ / IF– (Pins 18, 19) | Differential IF amplifier outputs | Open-collector; require external bias inductors or transformer center-tap; 102mA total DC current draw |
| IFGND (Pin 16) | IF amplifier ground return | Mandatory connection to system ground; omission prevents IF amplifier from drawing current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated SPDT LO switch | 44–47dB isolation between LO1/LO2 paths enables frequency-hopping with two synthesizers |
| High dynamic range architecture | 17.5dB NF under +5dBm blocking allows operation in congested spectrum without front-end attenuation |
| Dual-supply IF amplifier | VCCIF configurable from 3.3V to 5V - raises P1dB from 10.9dBm to 13.9dBm for improved weak-signal capture |
| Thermally enhanced QFN | Exposed pad (Pin 21) must be soldered to PCB ground plane - critical for maintaining TJ ≤ 150°C at full load |
| LO input matching stability | LO inputs remain 50Ω matched during shutdown - eliminates need for external RF switches in TDD designs |
Applications
| Wireless Infrastructure Receiver | Point-to-Point Microwave Link |
|---|---|
Use Scenario: LTE FDD base station downlink receiver operating in 2.3–2.7GHz band with 190MHz IF and high-side LO injection. IC Role / Device Role / Timing Role: Primary downconverting mixer providing RF-to-IF translation, LO switching, and IF amplification in single-chip solution. Use Value: Eliminates discrete LO switch and IF buffer, reducing BOM count by 3–5 components and board area by >25% versus discrete alternatives. | Use Scenario: 5G backhaul transceiver requiring 3.5GHz RF input, 3.31GHz LO, and 190MHz IF with minimal phase noise degradation. IC Role / Device Role / Timing Role: High-linearity mixer enabling wide IF bandwidth (up to 600MHz) and low spurious generation (–74dBc 3LO–3RF). Use Value: Achieves >37dB RF-to-LO isolation and >33dB RF-to-IF isolation - suppresses local oscillator feedthrough that would otherwise degrade EVM. |
| Frequency-Hopping System | Wideband Spectrum Analyzer Front-End |
Use Scenario: Military SATCOM terminal using two independent synthesizers (2.69GHz and 2.725GHz) with sub-50ns LO switching for anti-jamming. IC Role / Device Role / Timing Role: SPDT LO switch with <50ns transition time and LOSEL-controlled selection between two active LO sources. Use Value: Enables seamless hopping without LO leakage spikes - measured LO switching time ensures <1μs total channel reconfiguration. | Use Scenario: Portable spectrum analyzer covering 2.3–4.0GHz RF with real-time 100MHz analysis bandwidth and 5–600MHz IF tuning. IC Role / Device Role / Timing Role: Wideband mixer supporting variable IF output from 5MHz to 600MHz via external matching network. Use Value: Maintains ±0.15dB conversion gain flatness over 60MHz IF bandwidth at 3.5GHz RF - preserves amplitude accuracy across resolution bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC1040LP4CE | Higher P1dB (+15.5dBm), wider LO range (2.5–4.5GHz), but no integrated IF amplifier or LO switch | Requires external IF buffer and LO switch - increases layout complexity and insertion loss | Select when maximum linearity is prioritized over integration and board space |
| ADL5801ACPZ-R7 | Lower IIP3 (21.5dBm), single LO input, no shutdown or LO select functionality | Lacks frequency-hopping capability and power-gating - unsuitable for TDD or battery-powered systems | Select when cost sensitivity outweighs dynamic range and feature set requirements |
Compared with HMC1040LP4CE and ADL5801ACPZ-R7, the LTC5543IUH#TRPBF uniquely integrates LO switching, IF amplification, and shutdown control in a thermally robust QFN - delivering lowest component count for LTE/WiMAX infrastructure where size, power efficiency, and multi-synthesizer support are critical.
Availability
LTC5543IUH#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure receivers, point-to-point microwave links, and frequency-hopping communication systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC5543IUH#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 healthcare markets.
The LTC5543IUH#TRPBF belongs to ADI's high-dynamic-range RF mixer product line, designed specifically for cellular infrastructure, microwave backhaul, and defense electronics demanding wideband operation, low distortion, and integrated signal conditioning.
FAQ
What is the recommended LO drive level for optimal performance of the LTC5543IUH#TRPBF?
The LTC5543IUH#TRPBF is specified for 0dBm LO drive level across its 2.4–3.6GHz range, with excellent performance maintained over ±6dB. Drive levels above +6dBm risk ESD diode conduction; below –4dBm degrades conversion gain and IIP3. The internal limiting amplifiers ensure consistent operation without external level control circuits.
Can the LTC5543IUH#TRPBF operate with a single 3.3V supply, or is dual supply mandatory?
The LTC5543IUH#TRPBF can operate with a single 3.3V supply applied to both VCC (Pins 6, 8, 14) and VCCIF (Pins 18, 19). However, applying 5V to VCCIF increases IF amplifier P1dB from 10.9dBm to 13.9dBm - beneficial for high-dynamic-range applications. The mixer core itself remains powered at 3.3V regardless of VCCIF setting.
How does the shutdown function affect RF and LO port matching on the LTC5543IUH#TRPBF?
When SHDN is high (≥3V), the LTC5543IUH#TRPBF disables internal bias circuits but maintains 50Ω matching on LO1 and LO2 inputs - no external termination is needed. The RF input match degrades significantly during shutdown because the internal transformer bias is lost; thus, RF should be disconnected or attenuated in shutdown mode.
What is the purpose of the CT (center-tap) pin on the LTC5543IUH#TRPBF, and how should it be used?
The CT pin (Pin 3) connects to the center-tap of the internal RF transformer secondary and provides a 1.2V DC bias. It requires a bypass capacitor to ground for high-frequency decoupling - value depends on LO frequency (e.g., 22pF typical at 2.7GHz). Placement within 2mm of Pin 3 is critical for effective RF suppression; omitting this capacitor causes gain ripple and NF degradation.
Does the LTC5543IUH#TRPBF support both high-side and low-side LO injection, and what are the RF frequency limits for each?
Yes, the LTC5543IUH#TRPBF supports both configurations: high-side LO (fLO = fRF + fIF) enables RF input from 2.2–3.2GHz; low-side LO (fLO = fRF – fIF) extends RF coverage to 2.4–4.0GHz. Performance metrics (gain, IIP3, NF) are characterized separately for each mode - see Tables on pages 3–4 of the datasheet for exact boundaries.
LTC5543IUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- RF Type:
- LTE, WCS, WiMax
- Frequency:
- 2.3GHz ~ 4GHz
- Number of Mixers:
- 1
- Gain:
- 8.4dB
- Noise Figure:
- 10.2dB
- Secondary Attributes:
- -
- Current - Supply:
- 201mA
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (5x5)
LTC5543IUH#TRPBF FAQ
1.How can I place an order for LTC5543IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5543IUH#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 LTC5543IUH#TRPBF reliable?
The price and inventory of LTC5543IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5543IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC5543IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5543IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5543IUH#TRPBF?
LTC5543IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5543IUH#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 LTC5543IUH#TRPBF?
For technical support, including LTC5543IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5543IUH#TRPBF requirements.
6.How does Aetrix verify that LTC5543IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC5543IUH#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 LTC5543IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC5543IUH#TRPBF?
All LTC5543IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5543IUH#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 LTC5543IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC5543IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC5543IUH#TRPBF Tags
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MAX2671EUT+T
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ADEX-10+
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ADE-1ASK+
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ADE-1L+
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