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Analog Devices Inc. LTC5543IUH#PBF
- Part No.:
- LTC5543IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
LTC5543IUH#PBF.pdf
- Description:
- IC MIXER 2.3-4GHZ DWN CONV 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,385
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Product details
Overview
LTC5543IUH#PBF from Analog Devices (acquired Linear Technology) is a high-dynamic-range passive downconverting mixer optimized for 2.3GHz–4GHz RF input with 2.4GHz–3.6GHz LO range, delivering 8.4dB conversion gain, 24.5dBm IIP3, and 10.2dB noise figure at 2500MHz - used in LTE/WiMAX receivers requiring high-side LO injection and lossy IF filtering.
For engineers reviewing the LTC5543IUH#PBF datasheet, LTC5543IUH#PBF pinout, LTC5543IUH#PBF application, or LTC5543IUH#PBF equivalent, key selection criteria include RF/LO frequency alignment, dual-LO switching capability via LOSEL, shutdown control, IF amplifier supply flexibility (3.3V/5V), and QFN thermal management via exposed pad.
Technical Context
The LTC5543IUH#PBF integrates a double-balanced passive mixer core, differential IF amplifier with open-collector outputs, high-isolation SPDT LO switch, and LO buffer amplifiers - enabling frequency-hopping operation with <50ns LO switching time and >44dB LO1/LO2 isolation. Its RF input uses an integrated transformer with center-tap (CT) bias at 1.2V, while LO inputs remain 50Ω-matched 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 and requiring external matching networks (e.g., 4:1 transformer or discrete balun). The IF amplifier draws 102mA total from VCCIF (3.1–5.3V), and mixer/LO circuits draw 201mA from 3.3V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 2.3GHz to 4GHz - defines usable input signal band for cellular/WiMAX infrastructure receivers. |
| LO Frequency Range | 2.4GHz to 3.6GHz - specifies required local oscillator tuning range for optimal conversion performance. |
| Conversion Gain | 8.4dB at 2500MHz - enables direct drive of ADCs without additional IF gain stages in wideband receivers. |
| IIP3 | 24.5dBm at 2500MHz - ensures robust linearity against strong adjacent-channel interferers in dense RF environments. |
| Noise Figure | 10.2dB at 2500MHz - maintains receiver sensitivity when cascaded after LNA in high-selectivity front-ends. |
| Supply Voltage | VCC = 3.3V ±0.2V; VCCIF = 3.1–5.3V - allows IF amplifier headroom extension to 5V for +3dB P1dB improvement. |
| Package | 20-lead 5mm × 5mm QFN with exposed thermal pad - provides low θJA = 34°C/W for continuous 660mW operation. |
Pinout & Package
20-lead (5mm × 5mm) plastic QFN package with exposed pad (Pin 21) soldered to PCB ground for thermal and electrical integrity. Pin pitch: 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF (Pin 2) | Single-ended RF input | Internally connected to primary of integrated RF transformer; requires DC-blocking capacitor due to ~3.2Ω DC path to ground. |
| CT (Pin 3) | RF transformer secondary center-tap | Bias point at 1.2V DC; may require bypass capacitor for LO-frequency-dependent decoupling within 2mm. |
| SHDN (Pin 5) | Shutdown control input | Logic-low (<0.3V) enables device; logic-high (>3V) reduces supply current to 500μA; must not float. |
| LO1 (Pin 11), LO2 (Pin 15) | Dual single-ended LO inputs | 50Ω matched even during shutdown; selected by LOSEL; internal DC resistance ~20Ω (selected), ~50Ω (unselected). |
| IF+ / IF– (Pins 18/19) | Differential open-collector IF outputs | Require external biasing via inductors or transformer center-tap; each draws 51mA; need impedance matching for 50Ω single-ended output. |
| IFGND (Pin 16) | IF amplifier ground return | Mandatory connection to system ground to complete IF amplifier DC current path; omission disables IF output. |
| LOSEL (Pin 9) | LO select logic input | Low selects LO1, high selects LO2; controls SPDT switch with <50ns transition time for frequency-hopping systems. |
Key Features
| Feature | Design Value |
|---|---|
| High dynamic range architecture | 24.5dBm IIP3 and 17.5dB NF under +5dBm blocker enable operation in spectrally crowded base stations. |
| Dual active LO switching | Integrated SPDT LO switch with >44dB isolation supports two synthesizers for seamless frequency hopping without external switches. |
| Flexible IF supply | VCCIF supports 3.3V or 5V operation - raising to 5V increases input P1dB by 3dB (10.9dBm → 13.9dBm at 2500MHz). |
| Thermally enhanced QFN | Exposed pad (Pin 21) soldered to PCB ground achieves θJC = 3°C/W, critical for sustained 660mW power dissipation. |
| Shutdown mode | Reduces total supply current to 500μA while preserving 50Ω LO input match - ideal for TDD or burst-mode systems. |
Applications
| Wireless Infrastructure Receiver | Point-to-Point Microwave Link |
|---|---|
Use Scenario: LTE/WiMAX base station receiver operating in 2.3–2.7GHz band with 190MHz IF and high-side LO injection. IC Role / Device Role / Timing Role: Downconverting mixer providing RF-to-IF translation, LO switching, and IF amplification in single-chip solution. Use Value: High 24.5dBm IIP3 prevents desensitization from co-site interferers; 8.4dB gain reduces need for external IF gain stages. |
Use Scenario: 5GHz licensed microwave backhaul link using 3.5GHz RF input and 190MHz IF with low-phase-noise LO. IC Role / Device Role / Timing Role: High-linearity passive mixer core with integrated IF amplifier and dual-LO support for agile channel selection. Use Value: >44dB LO switch isolation minimizes LO leakage-induced spurs; 10.2dB NF preserves EVM in high-order QAM demodulation. |
| Frequency-Hopping System | Wideband Spectrum Analyzer Front-End |
Use Scenario: Military/commercial radio employing rapid LO switching between two synthesizers across 2.4–3.6GHz band. IC Role / Device Role / Timing Role: Mixer with hardware-controlled LO selection (LOSEL pin) and sub-50ns switching for minimal dead time. Use Value: Eliminates need for external RF switches or relays; maintains 50Ω match on inactive LO port during transition. |
Use Scenario: Portable spectrum analyzer covering 2.3–4GHz with programmable IF output from 5–600MHz. IC Role / Device Role / Timing Role: Broadband downconverter supporting variable IF frequencies via external matching network reconfiguration. Use Value: Wide 5–600MHz IF bandwidth enables real-time FFT analysis; 8.4dB gain flattens across IF band (±0.1dB at 190MHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC8193LP3DE | Higher 27dBm IIP3 but narrower 2.5–3.5GHz RF range; requires external IF amp; no integrated LO switch. | Preferred for ultra-high-linearity fixed-frequency links where dual-LO switching is unnecessary. | Select HMC8193LP3DE when maximum IIP3 outweighs integration benefits and LO agility is not required. |
| ADL5802ACPZ-R7 | Wider 700MHz–2.8GHz RF range; lower 19.5dBm IIP3; single LO input; 3.3V-only IF supply. | Suitable for multi-band portable receivers but lacks frequency-hopping capability and 5V IF headroom. | Choose ADL5802ACPZ-R7 for cost-sensitive, non-hopping applications below 2.8GHz with simpler biasing. |
Compared with LTC5543IUH#PBF, HMC8193LP3DE offers superior linearity at the expense of LO flexibility and integration, while ADL5802ACPZ-R7 trades bandwidth and IIP3 for lower cost and smaller footprint in sub-2.8GHz designs.
Availability
LTC5543IUH#PBF 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, full traceability, and long-term lifecycle support.
Supply support for LTC5543IUH#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 continues its legacy of high-performance RF signal chain components, emphasizing precision, linearity, and integration for demanding communications applications.
The LTC5543IUH#PBF belongs to Linear's high-dynamic-range passive mixer family designed specifically for cellular infrastructure, microwave backhaul, and defense EW systems requiring wide RF bandwidth, dual-LO agility, and robust blocking immunity.
FAQ
What is the recommended LO drive level for optimal performance of the LTC5543IUH#PBF?
The LTC5543IUH#PBF is optimized for 0dBm LO drive across its 2.4–3.6GHz range, delivering peak conversion gain (8.4dB), IIP3 (24.5dBm), and NF (10.2dB) at 2500MHz. Performance remains stable within ±6dB (–6 to +6dBm); drive levels above +6dBm risk ESD diode conduction. The internal limiting amplifiers ensure consistent operation without external level control.
Can the LTC5543IUH#PBF operate with only one LO source, and how should the unused LO input be terminated?
Yes, the LTC5543IUH#PBF can operate with a single LO source. When only LO1 is used, tie LO2 to ground through a DC-blocking capacitor (e.g., 2.7pF) to maintain 50Ω match and minimize reflections. The LO switch remains functional - LOSEL pin must be held low to select LO1. Unused LO inputs retain 50Ω match even during shutdown, eliminating need for external termination resistors.
How does the IF amplifier supply voltage affect the RF performance of the LTC5543IUH#PBF?
Raising VCCIF from 3.3V to 5V increases the LTC5543IUH#PBF's RF input P1dB by 3dB (10.9dBm → 13.9dBm at 2500MHz) with negligible impact on conversion gain or IIP3. This extended compression point improves dynamic range in high-signal environments. The IF amplifier draws 102mA total regardless of VCCIF, so thermal design must accommodate higher power dissipation at 5V.
What is the function of the CT (center-tap) pin on the LTC5543IUH#PBF, and is it mandatory to use?
The CT (Pin 3) provides access to the RF transformer secondary center-tap, biased internally at 1.2V DC. It is not mandatory for basic operation but may require a bypass capacitor (value LO-frequency-dependent) placed within 2mm for improved high-frequency decoupling in demanding layouts. Omitting CT connection has no effect on RF matching or conversion performance when LO inputs are properly driven.
Does the LTC5543IUH#PBF support both high-side and low-side LO injection, and what are the RF frequency limits for each?
Yes, the LTC5543IUH#PBF supports both configurations. For high-side LO (fLO = fRF + fIF), RF range is 2.2–3.2GHz (e.g., 2.3–2.7GHz RF with 190MHz IF). For low-side LO (fLO = fRF – fIF), RF range extends to 2.4–4.0GHz (e.g., 3.5GHz RF with 190MHz IF). LO frequency must always stay within 2.4–3.6GHz, and IF bandwidth remains 5–600MHz in both modes.
LTC5543IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- 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:
- Down Converter
- Current - Supply:
- 201mA
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (5x5)
LTC5543IUH#PBF FAQ
1.How can I place an order for LTC5543IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5543IUH#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 LTC5543IUH#PBF reliable?
The price and inventory of LTC5543IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5543IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC5543IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5543IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5543IUH#PBF?
LTC5543IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5543IUH#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 LTC5543IUH#PBF?
For technical support, including LTC5543IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5543IUH#PBF requirements.
6.How does Aetrix verify that LTC5543IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC5543IUH#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 LTC5543IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC5543IUH#PBF?
All LTC5543IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5543IUH#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 LTC5543IUH#PBF part is unused and in its original packaging.
Return procedure for LTC5543IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC5543IUH#PBF Tags
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