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Analog Devices Inc. LTC5541IUH#PBF
- Part No.:
- LTC5541IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
LTC5541IUH#PBF.pdf
- Description:
- IC MIXR 1.3-2.3GHZ DWNCONV 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,483
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Product details
Overview
LTC5541IUH#PBF from Analog Devices (formerly Linear Technology) is a high-dynamic-range passive downconverting mixer optimized for 1.3GHz–2.3GHz RF input and 1.4GHz–2.0GHz LO operation, delivering 7.8dB conversion gain, 26.4dBm IIP3, and 9.6dB noise figure at 1950MHz - enabling LTE/W-CDMA receiver front-ends with lossy IF filtering and minimal board space.
For engineers reviewing the LTC5541IUH#PBF datasheet, LTC5541IUH#PBF pinout, LTC5541IUH#PBF application, or LTC5541IUH#PBF equivalent, key selection factors include dual LO switching capability, 50Ω single-ended RF/LO interfaces, differential IF output with adjustable bias, shutdown control, and QFN-20 package thermal performance in wireless infrastructure designs.
Technical Context
The LTC5541IUH#PBF integrates a double-balanced passive mixer core, integrated SPDT LO switch with <50ns switching time and >50dB isolation, and a fully differential IF amplifier with open-collector outputs. It supports both low-side and high-side LO injection configurations.
Its RF input uses an internal transformer with center-tap (CT) bias at 1.2V, while LO inputs are 50Ω-matched across 1.4–2.0GHz regardless of shutdown state. The IF amplifier accepts 3.3V or 5V supply (VCCIF), enabling P1dB scaling from 11.3dBm to 14.6dBm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 1.3GHz–2.3GHz - defines usable signal band for cellular infrastructure receivers (LTE Bands 3/4/25/38/41). |
| LO Frequency Range | 1.4GHz–2.0GHz - specifies optimal local oscillator injection window for low-side or high-side mixing. |
| Conversion Gain | 7.8dB at 1950MHz - enables direct connection to ADCs or IF filters without additional gain stages. |
| IIP3 | 26.4dBm at 1950MHz - supports strong adjacent-channel interferers in dense spectrum environments. |
| Noise Figure | 9.6dB at 1950MHz - ensures adequate SNR in base station receiver chains with moderate LNA gain. |
| Supply Current | 192mA total (VCC + VCCIF) at 3.3V - determines thermal design and power rail sizing for multi-channel systems. |
| Shutdown Current | 500μA - allows power gating in TDD or burst-mode applications without PCB layout changes. |
Pinout & Package
Package: 20-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 21 = GND). Requires soldering exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF (Pin 2) | Single-ended RF input | Internally connected to primary of integrated transformer; requires DC-blocking capacitor; 50Ω match enabled only when selected LO is driven. |
| CT (Pin 3) | RF transformer center-tap | Provides 1.2V internal bias node; requires DC isolation; optional bypass capacitor for LO-frequency-dependent decoupling. |
| SHDN (Pin 5) | Shutdown control input | Active-low logic: <0.3V = enabled, >3V = disabled; controls all internal supplies including VCC1/VCC2/VCC3/VCCIF paths. |
| LO1 / LO2 (Pins 11 / 15) | Dual single-ended LO inputs | 50Ω matched even in shutdown; selected via LOSEL; support frequency-hopping with <50ns switch time and >50dB isolation. |
| IF+ / IF– (Pins 18 / 19) | Differential open-collector IF outputs | Require external biasing via inductors or transformer center-tap; each draws ~50mA; support 5–500MHz IF bandwidth with external matching. |
| IFBIAS (Pin 20) | IF amplifier bias adjustment | Allows fine-tuning of IF amplifier quiescent current; nominal DC voltage 2.1V; typically left unconnected in standard applications. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated SPDT LO switch | Enables dual-synthesizer architectures with <50ns switching and >50dB LO1/LO2 isolation - critical for frequency-hopping receivers. |
| 50Ω single-ended RF/LO interfaces | Eliminates need for external baluns or matching networks at RF and LO ports - reduces BOM count and layout complexity. |
| Dual-supply IF amplifier (3.3V/5V) | Scaling VCCIF from 3.3V to 5V increases RF input P1dB by 3.3dB - allows trade-off between linearity and power consumption. |
| Shutdown mode with 500μA leakage | Supports time-division duplex (TDD) operation and power cycling without reinitialization - preserves system-level timing alignment. |
| Thermally enhanced QFN package | θJC = 3°C/W enables >1W dissipation with proper PCB copper area - suitable for multi-carrier base station modules. |
Applications
| Cellular Base Station Receiver | Point-to-Point Microwave Link |
|---|---|
Use Scenario: LTE FDD macrocell receiver with 1.7–2.2GHz RF input and 190MHz IF output using low-side LO injection. IC Role / Device Role / Timing Role: Primary downconverting mixer providing RF-to-IF translation, image rejection, and IF amplification before SAW filtering and ADC sampling. Use Value: High IIP3 (26.4dBm) and low NF (9.6dB) maintain EVM under co-site interference; 7.8dB gain reduces need for post-mixer amplification. | Use Scenario: 23GHz licensed microwave backhaul receiver requiring high selectivity and dynamic range over temperature. IC Role / Device Role / Timing Role: Wideband downconverter supporting multiple channel plans via programmable LO selection and IF bandwidth tuning. Use Value: Dual LO inputs enable seamless frequency hopping; 50Ω RF/LO interfaces simplify impedance matching across wide IF range (5–500MHz). |
| TD-SCDMA Infrastructure | UMTS Femtocell Front-End |
Use Scenario: TD-SCDMA Node B receiver operating in 2.01–2.025GHz band with time-sliced uplink/downlink paths. IC Role / Device Role / Timing Role: Mixer core with fast shutdown (<1.5μs off-time) synchronized to TDD frame timing for transmit/receive isolation. Use Value: 500μA shutdown current minimizes idle power; LO switch isolation (>50dB) prevents LO leakage into adjacent time slots. | Use Scenario: Indoor UMTS femtocell with compact form factor requiring minimal external components and thermal footprint. IC Role / Device Role / Timing Role: Integrated mixer + IF amplifier replaces discrete solution, reducing component count and PCB area by >40%. Use Value: 5mm × 5mm QFN package with exposed pad meets thermal constraints; single 3.3V supply option simplifies power architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC774ALC3B | Higher frequency range (2.5–5.0GHz), no integrated LO switch, requires external LO buffer; 24dBm IIP3 at 3.5GHz. | Targeted at higher-band 5G NR and mmWave infrastructure, not optimized for sub-3GHz LTE/W-CDMA bands. | Select when operating above 2.3GHz or requiring higher integration density without dual-LO switching. |
| MAX2039ETX+ | Lower frequency range (400MHz–2.5GHz), integrated LO buffer but no SPDT switch; 25.5dBm IIP3 at 1.9GHz; 32-pin TQFN. | Suitable for cost-sensitive small-cell deployments where dual-LO switching is unnecessary and larger package is acceptable. | Select when dual-LO switching is not required and board space permits larger footprint. |
Compared with HMC774ALC3B and MAX2039ETX+, the LTC5541IUH#PBF uniquely combines 1.3–2.3GHz RF optimization, integrated dual-LO SPDT switch, and 50Ω single-ended interfaces - making it the only solution that supports frequency-hopping LTE receivers without external switches or baluns.
Availability
LTC5541IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure receivers, point-to-point microwave links, and high-dynamic-range downmixer applications requiring stable component supply across multi-year production cycles.
Supply support for LTC5541IUH#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC5541IUH#PBF belongs to the LTC554x high-dynamic-range mixer family, designed specifically for cellular infrastructure receivers requiring wide instantaneous bandwidth, high linearity, and robust thermal performance in compact form factors.
FAQ
What is the recommended LO drive level for optimal performance of the LTC5541IUH#PBF?
The LTC5541IUH#PBF is specified for 0dBm LO drive level across 1.4–2.0GHz, with excellent performance maintained over ±6dB range. 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 circuits.
Can the LTC5541IUH#PBF operate with only one LO source, or does it require two active synthesizers?
The LTC5541IUH#PBF supports single-LO operation: connect the unused LO input (LO1 or LO2) to ground and set LOSEL to select the active port. Its integrated SPDT switch remains functional with one source, providing >50dB isolation between ports - eliminating need for external switches in non-frequency-hopping designs.
How does supply voltage affect RF input P1dB in the LTC5541IUH#PBF?
In the LTC5541IUH#PBF, increasing VCCIF from 3.3V to 5V raises RF input P1dB by 3.3dB (from 11.3dBm to 14.6dBm at 1950MHz), with corresponding increase in IF amplifier supply current. VCC (mixer/LO switch) remains fixed at 3.3V; only VCCIF scaling impacts P1dB - enabling precise linearity/power trade-offs per system requirement.
What is the function of the CT (center-tap) pin on the LTC5541IUH#PBF, and is it mandatory to use?
The CT pin (Pin 3) provides access to the RF transformer secondary center-tap, biased internally at 1.2V. It is not mandatory for basic operation but enables optional bypass capacitor placement for improved LO-frequency-dependent decoupling. Leaving CT unconnected is acceptable in most applications; if used, capacitor must be placed within 2mm of Pin 3 for effective HF performance.
Does the LTC5541IUH#PBF require external matching components for 50Ω RF and LO interfaces?
Yes - the LTC5541IUH#PBF requires external 2.2pF series capacitor on RF input and 22pF shunt capacitors on LO inputs to achieve >12dB return loss across 1.3–2.3GHz (RF) and 1.4–2.0GHz (LO). These components establish broadband 50Ω matching and provide DC blocking; omission degrades conversion gain flatness and increases LO leakage.
LTC5541IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- RF Type:
- W-CDMA
- Frequency:
- 1.3GHz ~ 2.3GHz
- Number of Mixers:
- 1
- Gain:
- 7.8dB
- Noise Figure:
- 9.6dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 192mA
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (5x5)
LTC5541IUH#PBF FAQ
1.How can I place an order for LTC5541IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5541IUH#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 LTC5541IUH#PBF reliable?
The price and inventory of LTC5541IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5541IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC5541IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5541IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5541IUH#PBF?
LTC5541IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5541IUH#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 LTC5541IUH#PBF?
For technical support, including LTC5541IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5541IUH#PBF requirements.
6.How does Aetrix verify that LTC5541IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC5541IUH#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 LTC5541IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC5541IUH#PBF?
All LTC5541IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5541IUH#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 LTC5541IUH#PBF part is unused and in its original packaging.
Return procedure for LTC5541IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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