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Analog Devices Inc. LTC5541IUH#TRPBF
- Part No.:
- LTC5541IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
LTC5541IUH#TRPBF.pdf
- Description:
- IC MIXR 1.3-2.3GHZ DWNCONV 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
LTC5541IUH#TRPBF from Analog Devices (formerly Linear Technology) is a high-dynamic-range passive downconverting mixer IC optimized for 1.3GHz–2.3GHz RF input and 1.4GHz–2.0GHz LO operation. It delivers 7.8dB conversion gain, 26.4dBm IIP3, and 9.6dB noise figure at 1950MHz, with integrated SPDT LO switch and differential IF amplifier - enabling LTE/W-CDMA receiver front-ends requiring high linearity and wide IF bandwidth (5–500MHz).
For engineers reviewing the LTC5541IUH#TRPBF datasheet, LTC5541IUH#TRPBF pinout, LTC5541IUH#TRPBF application, or LTC5541IUH#TRPBF equivalent, key selection criteria include LO switching time (50ns), shutdown current (500μA), dual-supply IF biasing (3.3V/5V), 20-pin 5mm × 5mm QFN package, and verified low-side/high-side LO injection support.
Technical Context
The LTC5541IUH#TRPBF integrates a passive double-balanced mixer core, high-speed SPDT LO switch, LO buffer amplifier, and differential IF amplifier with adjustable bias. Its RF and LO inputs are single-ended and 50Ω-matched; IF output is differential open-collector requiring external bias inductors or transformer center-tap.
It supports both low-side (fLO = fRF – fIF) and high-side (fLO = fRF + fIF) injection, with LO switch isolation ≥50dB and RF-to-LO isolation >52dB. The CT pin provides RF transformer secondary center-tap access for bypassing, and IFBIAS/LOBIAS pins allow DC bias tuning of respective amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 1.3GHz to 2.3GHz - covers LTE Band 3/4/25/38/41 and W-CDMA UMTS 2100 MHz bands. |
| LO Frequency Range | 1.4GHz to 2.0GHz - requires precise synthesizer alignment; supports frequency-hopping via LO1/LO2 selection. |
| Conversion Gain | 7.8dB at 1950MHz - enables direct connection to ADCs without additional IF gain stages in many designs. |
| IIP3 | 26.4dBm at 1950MHz - ensures robust blocking immunity in dense RF environments like macrocell base stations. |
| Noise Figure | 9.6dB at 1950MHz - maintains SNR integrity when cascaded after LNA in high-selectivity receivers. |
| Supply Current | 192mA total (VCC + VCCIF) at 3.3V - defines thermal management requirements for compact RF modules. |
| Shutdown Current | 500μA - allows power-gating during idle periods in battery-assisted or TDD systems. |
Pinout & Package
The LTC5541IUH#TRPBF is housed in a 20-lead 5mm × 5mm plastic QFN package (UH) with exposed thermal pad (Pin 21) soldered to PCB ground. Pin 1 is NC; RF, LO1, LO2, IF+, IF−, and GND pins require strict RF layout practices including controlled-impedance traces and local decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF (Pin 2) | Single-ended RF input | Internally connected to primary of integrated transformer; requires series DC-blocking capacitor (e.g., 2.2pF) and 50Ω source match. |
| CT (Pin 3) | RF transformer secondary center-tap | Provides 1.2V DC bias point; may require local bypass capacitor for LO-frequency-dependent decoupling. |
| SHDN (Pin 5) | Active-low shutdown control | Drives internal circuits ON below 0.3V; OFF above 3V; enables fast (<1μs) power cycling in TDD systems. |
| LO1 / LO2 (Pins 11 / 15) | Single-ended LO inputs | 50Ω matched even in shutdown state; selected via LOSEL; require DC-blocking capacitors (e.g., 22pF). |
| IF+ / IF− (Pins 18 / 19) | Differential open-collector IF outputs | Each draws ~50mA; require external bias (via inductors or transformer center-tap) to VCCIF (3.3V or 5V). |
| IFGND (Pin 16) | IF amplifier DC return path | Must be connected directly to ground; omission prevents IF amplifier current flow and disables IF output. |
| LOSEL (Pin 9) | LO port select logic input | Low = LO1 active; High = LO2 active; controls <50ns switch transition for frequency-hopping applications. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated SPDT LO switch | Enables dual-synthesizer architectures with 52dB LO1/LO2 isolation and sub-50ns switching for LTE-TDD or radar pulse timing. |
| Adjustable IF amplifier bias (IFBIAS) | Allows optimization of P1dB vs power trade-off: +3dB P1dB gain achieved by raising VCCIF from 3.3V to 5V. |
| 50Ω-matched RF/LO ports | Eliminates need for external matching networks across full RF/LO bands, reducing BOM count and board area in multi-band radios. |
| Wide IF bandwidth support | Validated operation from 5MHz to 500MHz enables flexible IF placement - e.g., 190MHz SAW filtering or direct sampling at 100+ MHz. |
| Thermally enhanced QFN package | Exposed pad (Pin 21) and θJA = 34°C/W enable stable operation up to +85°C ambient in densely packed RF front-ends. |
Applications
| Cellular Base Station Receiver | Point-to-Point Microwave Link |
|---|---|
Use Scenario: LTE FDD macrocell receiver processing 1700–2200MHz RF signals with 190MHz IF output. IC Role / Device Role / Timing Role: Primary downconverting mixer providing RF-to-IF translation, LO switching, and IF amplification in first IF stage. Use Value: 26.4dBm IIP3 and 7.8dB gain allow use of lossy SAW filters without cascaded LNAs, reducing system cost and footprint. | Use Scenario: 2.3GHz licensed microwave backhaul link requiring high adjacent-channel rejection and low phase noise mixing. IC Role / Device Role / Timing Role: High-linearity passive mixer core with differential IF output driving bandpass filter and ADC interface. Use Value: >52dB RF-to-LO isolation and <–32dBm LO leakage minimize reciprocal mixing and improve EVM in 256-QAM systems. |
| Frequency-Hopping Military Radio | Wideband Spectrum Analyzer Front-End |
Use Scenario: Tactical radio supporting rapid LO switching between two independent synthesizers across 1.4–2.0GHz range. IC Role / Device Role / Timing Role: Dual-LO-input mixer with hardware-controlled LOSEL pin enabling <50ns port selection for anti-jamming agility. Use Value: LO switch isolation ≥50dB prevents cross-coupling between synthesizers, preserving signal integrity during hop transitions. | Use Scenario: Portable spectrum analyzer covering 1.3–2.3GHz with real-time IF digitization at 100–500MHz. IC Role / Device Role / Timing Role: Wideband downconverter delivering flat conversion gain (±0.1dB) and consistent NF across full RF band. Use Value: 5–500MHz IF bandwidth and <±0.1dB gain flatness enable calibrated amplitude response without per-channel correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-dynamic-range downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC774ALC3B | Wider RF range (1.7–4.2GHz); higher P1dB (+16.5dBm); no integrated IF amplifier; requires external IF gain stage. | Better suited for wideband test equipment where IF gain is implemented separately; lacks shutdown and LO switching features. | Select when maximum RF bandwidth and P1dB outweigh need for integrated IF amplification and power control. |
| MAX2039ETX+ | Lower IIP3 (22.5dBm); integrated LO buffer only (no SPDT switch); 32-pin 5mm × 5mm TQFN; supports 0.6–2.7GHz RF. | Targeted at cost-sensitive infrastructure where dual-LO switching is unnecessary and moderate linearity suffices. | Select when dual-LO capability is not required and lower IIP3 is acceptable for indoor small-cell deployments. |
Compared with HMC774ALC3B and MAX2039ETX+, the LTC5541IUH#TRPBF uniquely combines integrated IF amplification, dual-LO switching, and 26.4dBm IIP3 in a 20-pin QFN - making it optimal for space-constrained, high-selectivity receivers needing rapid reconfiguration and minimal external components.
Availability
LTC5541IUH#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure receivers, point-to-point microwave links, and military communications systems requiring stable component supply, extended temperature operation (–40°C to +85°C), and RoHS-compliant packaging.
Supply support for LTC5541IUH#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 RF ICs, formed through the acquisition of Linear Technology in 2017.
The LTC5541IUH#TRPBF belongs to ADI's high-dynamic-range RF mixer product line, engineered specifically for demanding wireless infrastructure applications where linearity, noise performance, and integration reduce system complexity and improve reliability.
FAQ
What is the recommended LO drive level for optimal performance of the LTC5541IUH#TRPBF?
The LTC5541IUH#TRPBF is specified for 0dBm LO drive level across its 1.4–2.0GHz range, with excellent performance maintained over ±6dB. Drive levels exceeding +6dBm risk ESD diode conduction; below –4dBm degrades conversion gain and IIP3. The internal limiting amplifiers ensure consistent operation without external level control.
Can the LTC5541IUH#TRPBF operate with high-side LO injection, and what are the implications?
Yes, the LTC5541IUH#TRPBF supports high-side LO injection (fLO = fRF + fIF) for RF inputs from 1300–1800MHz. At 1600MHz RF, it delivers 8.4dB conversion gain and 24.6dBm IIP3 - slightly lower than low-side mode but still suitable for applications requiring image-reject architecture or specific IF placement constraints.
How does the IF amplifier biasing affect RF performance in the LTC5541IUH#TRPBF?
Raising VCCIF from 3.3V to 5V increases RF input P1dB by ~3.3dB (from 11.3dBm to 14.6dBm at 1950MHz) while increasing total supply current. This trade-off improves strong-signal handling in congested spectral environments but requires careful thermal design due to higher power dissipation in the IF amplifier section of the LTC5541IUH#TRPBF.
What is the function of the CT (center-tap) pin on the LTC5541IUH#TRPBF, and is it mandatory to use?
The CT pin (Pin 3) connects to the secondary center-tap of the internal RF transformer and carries a nominal 1.2V DC bias. While not mandatory for basic operation, adding a bypass capacitor here improves LO-frequency-dependent decoupling and can enhance RF input match stability - particularly critical in broadband or multi-band designs using the LTC5541IUH#TRPBF.
Does the LTC5541IUH#TRPBF require external matching components for 50Ω RF and LO interfaces?
Yes - although the RF and LO ports are internally 50Ω-matched when driven, external components are required: a 2.2pF series capacitor on RF (Pin 2) for DC blocking and match, and 22pF series capacitors on LO1/LO2 (Pins 11/15) for DC blocking and input match optimization. These values are validated in the standard evaluation circuit (DC1431A) for the LTC5541IUH#TRPBF.
LTC5541IUH#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:
- W-CDMA
- Frequency:
- 1.3GHz ~ 2.3GHz
- Number of Mixers:
- 1
- Gain:
- 7.8dB
- Noise Figure:
- 9.5dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 192mA
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (5x5)
LTC5541IUH#TRPBF FAQ
1.How can I place an order for LTC5541IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5541IUH#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 LTC5541IUH#TRPBF reliable?
The price and inventory of LTC5541IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5541IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC5541IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5541IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5541IUH#TRPBF?
LTC5541IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5541IUH#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 LTC5541IUH#TRPBF?
For technical support, including LTC5541IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5541IUH#TRPBF requirements.
6.How does Aetrix verify that LTC5541IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC5541IUH#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 LTC5541IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC5541IUH#TRPBF?
All LTC5541IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5541IUH#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 LTC5541IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC5541IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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