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Analog Devices Inc. LTC5542IUH#PBF
- Part No.:
- LTC5542IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
LTC5542IUH#PBF.pdf
- Description:
- IC MIXR 1.6-2.7GHZ DWNCONV 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,855
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Product details
Overview
LTC5542IUH#PBF from Analog Devices (formerly Linear Technology) is a high-dynamic-range passive downconverting mixer IC optimized for 1.6GHz–2.7GHz RF input and 1.7GHz–2.5GHz LO operation. It delivers 8dB conversion gain, 26.8dBm IIP3, and 9.9dB noise figure at 2.4GHz, with integrated SPDT LO switch, 3.3V/5V dual-supply IF amplifier, and shutdown control - enabling LTE/WiMAX receiver front-ends requiring high linearity and low-noise IF extraction.
For engineers reviewing the LTC5542IUH#PBF datasheet, LTC5542IUH#PBF pinout, LTC5542IUH#PBF application, or LTC5542IUH#PBF equivalent, this page provides verified RF frequency range, LO switching isolation, IF output biasing requirements, conversion gain flatness, and thermal stability data directly extracted from the official 5542f datasheet and evaluation circuit documentation.
Technical Context
The LTC5542IUH#PBF integrates a double-balanced passive mixer core, differential IF amplifier with open-collector outputs, high-speed SPDT LO switch (50ns switching), and LO buffer amplifiers optimized for 1.7–2.5GHz. Its RF and LO inputs are single-ended and 50Ω-matched; IF output is differential and requires external biasing via inductors or transformer center-tap.
It supports both low-side (RF = LO + IF) and high-side (RF = LO – IF) LO injection, with measured conversion gain flatness of ±0.15dB over 2350±30MHz RF and 190±30MHz IF. The CT pin (Pin 3) provides transformer secondary center-tap access for bypassing, and LOSEL (Pin 9) selects between LO1 and LO2 with logic-controlled isolation >49dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 1.6GHz to 2.7GHz - defines usable input band for LTE/WiMAX receivers; requires external matching for full-band return loss >12dB. |
| LO Frequency Range | 1.7GHz to 2.5GHz - must be driven within this window for optimal conversion gain and IIP3; supports frequency-hopping via LO1/LO2 selection. |
| Conversion Gain | 8.0dB at 2.4GHz - enables direct interface with ADCs or IF filters without additional gain stages; flatness ±0.15dB ensures stable channel response. |
| IIP3 | 26.8dBm at 2.4GHz - allows handling strong adjacent-channel interferers in dense RF environments without third-order distortion corruption. |
| Noise Figure | 9.9dB at 2.4GHz - sets minimum detectable signal level; degrades to 17.3dB under +5dBm blocker, confirming robust blocking immunity. |
| Supply Current | 199mA total (VCC + VCCIF) at 3.3V - determines thermal design and PCB copper weight; drops to 500μA in shutdown mode for power-gated systems. |
| Package | 20-lead 5mm × 5mm QFN (UH) with exposed thermal pad - requires soldered GND connection to PCB for thermal dissipation (θJC = 3°C/W). |
Pinout & Package
20-lead (5mm × 5mm) plastic QFN package (UH) with exposed pad (Pin 21) connected to GND and required to be soldered to PCB for thermal and electrical integrity. Pin 1 is NC (no internal connection); all GND pins (4, 10, 12, 13, 17, 21) must connect to RF ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF (Pin 2) | Single-ended RF input | Internally connected to primary of integrated transformer; requires DC-blocking capacitor due to ~3.6Ω DC path to GND. |
| 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) | Shutdown control input | Logic-low (<0.3V) enables device; logic-high (>3V) reduces supply current to 500μA; must not float. |
| VCC1/VCC2 (Pins 6, 8) | Mixer and LO buffer supply | Internally tied; requires 3.3V ±0.2V with local 1μF bypass; supplies 99mA typical for mixer/LO circuits. |
| LOSEL (Pin 9) | LO port select control | Logic-low selects LO1; logic-high selects LO2; controls SPDT switch with >49dB isolation between ports. |
| LO1/LO2 (Pins 11, 15) | Single-ended LO inputs | 50Ω matched even during shutdown; require DC-blocking capacitors; accept 0dBm ±6dB drive. |
| VCC3 (Pin 14) | LO switch supply | 3.3V supply dedicated to SPDT switch; draws <100μA; must be bypassed locally. |
| IFGND (Pin 16) | IF amplifier DC return | Completes IF amplifier current path; must be connected to GND - open connection disables IF output. |
| IF+/IF– (Pins 18, 19) | Differential IF amplifier outputs | Open-collector; require external bias via inductors or transformer center-tap; each sinks 50mA at 3.3V. |
| IFBIAS (Pin 20) | IF amplifier bias adjustment | Allows fine-tuning of IF amplifier quiescent current; nominal DC voltage 2.1V; typically left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| High dynamic range architecture | 26.8dBm IIP3 + 9.9dB NF enables receiver designs meeting LTE ACLR and ACS specifications without external preselection. |
| Integrated SPDT LO switch | 50ns switching time and >49dB isolation support frequency-hopping systems using two independent synthesizers. |
| Dual-supply IF amplifier | VCCIF configurable from 3.3V to 5V - increases RF P1dB by 3.4dB (11.3dBm → 14.7dBm) for high-sensitivity applications. |
| 50Ω single-ended RF/LO interfaces | Eliminates need for external baluns or matching networks at RF/LO ports when driven with standard 50Ω sources. |
| Thermally enhanced QFN package | Exposed pad (Pin 21) and θJC = 3°C/W allow sustained operation at 85°C ambient with minimal heatsinking. |
Applications
| LTE Base Station Receiver | WiMAX Subscriber Unit Front-End |
|---|---|
|
Use Scenario: Downconversion of 2.3–2.7GHz RF signals to 190MHz IF in macrocell base station transceivers. IC Role / Device Role / Timing Role: Passive mixer core with integrated IF amplifier performs RF-to-IF translation while maintaining EVM and ACLR compliance. Use Value: 8dB conversion gain and 26.8dBm IIP3 reduce cascaded noise figure and eliminate need for LNA gain staging before filtering. |
Use Scenario: High-selectivity downmixing in fixed WiMAX CPE units operating in 2.5–2.7GHz licensed band. IC Role / Device Role / Timing Role: LO-switched mixer enables rapid channel switching between adjacent 3.5MHz channels with minimal settling delay. Use Value: LOSEL-controlled SPDT switch provides >49dB isolation, preventing LO leakage-induced desensitization during frequency agility. |
| Point-to-Point Microwave Link | Wideband Spectrum Analyzer Front-End |
|
Use Scenario: 1.7–2.5GHz IF-downconversion in 6–8GHz microwave backhaul radios using image-reject architecture. IC Role / Device Role / Timing Role: Supports both low-side and high-side LO injection to enable flexible image rejection filter placement. Use Value: ±0.15dB conversion gain flatness across 60MHz IF bandwidth ensures amplitude accuracy for digital demodulation. |
Use Scenario: Broadband RF sampling front-end covering 1.6–2.7GHz with real-time spectrum analysis capability. IC Role / Device Role / Timing Role: High-linearity mixer feeds digitizer with minimal intermodulation distortion across multi-tone test signals. Use Value: 17.3dB NF under +5dBm blocker preserves dynamic range when analyzing crowded spectral environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC5541IUH#PBF | RF range 1.3–2.3GHz, LO range 1.4–2.0GHz; 0.3dB lower IIP3 (26.5dBm typ) at 1.95GHz; same 20-lead QFN package. | Better suited for PCS/W-CDMA bands (1850–1990MHz); not rated for 2.6GHz LTE Band 7 operation. | Select when targeting 1.4–2.0GHz RF/LO bands and lower power consumption is prioritized over upper-band coverage. |
| ADL5365ACPZ-R7 | RF range 1.7–2.7GHz, LO range 1.7–2.7GHz; higher 24.2dBm IIP3 but no integrated LO switch or IF amplifier; 32-lead LFCSP package. | Requires external LO switch and IF driver; better for ultra-low-noise applications where discrete optimization is acceptable. | Choose when system-level integration is less critical than ultimate linearity and LO flexibility beyond 2.5GHz. |
Compared with LTC5542IUH#PBF, LTC5541IUH#PBF trades upper-band RF coverage for marginally lower LO range and reduced IIP3, while ADL5365ACPZ-R7 sacrifices integration (no LO switch, no IF amp) to achieve broader LO tuning and higher raw linearity - making LTC5542IUH#PBF optimal for compact, high-performance LTE/WiMAX receivers needing embedded switching and bias control.
Availability
LTC5542IUH#PBF is available at Aetrix Electronics and suitable for LTE infrastructure receivers, WiMAX subscriber units, point-to-point microwave links, and wideband spectrum analyzer front-ends requiring stable component supply, extended temperature operation (–40°C to +85°C), and lead-free compliance.
Supply support for LTC5542IUH#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, datasheet archives, and application engineering for legacy Linear RF components including the LTC5542 series.
The LTC5542IUH#PBF belongs to Linear's high-dynamic-range passive mixer family designed specifically for wireless infrastructure receivers demanding high IIP3, low noise figure, and integrated LO switching - targeting LTE, WiMAX, and microwave communication systems.
FAQ
What is the recommended LO drive level for LTC5542IUH#PBF?
The LTC5542IUH#PBF is optimized for 0dBm LO drive across its 1.7–2.5GHz range, with specified performance maintained over ±6dB (–6dBm to +6dBm). Drive levels above +6dBm risk ESD diode conduction; below –6dBm degrade conversion gain and IIP3. The datasheet confirms 8dB gain and 26.8dBm IIP3 at exactly 0dBm LO input at 2.4GHz.
Can LTC5542IUH#PBF operate with only one LO source?
Yes - LTC5542IUH#PBF supports single-LO operation. When only LO1 is used, LO2 may be grounded; when only LO2 is used, LO1 may be grounded. The LOSEL pin (Pin 9) must be held at appropriate logic level (low for LO1, high for LO2), and the unselected port remains 50Ω-matched even during shutdown, minimizing layout complexity.
How does supply voltage affect RF input P1dB in LTC5542IUH#PBF?
Raising VCCIF from 3.3V to 5V increases RF input P1dB by 3.4dB - from 11.3dBm to 14.7dBm at 2.4GHz - due to higher IF amplifier output swing and improved headroom. VCC (mixer/LO supply) remains fixed at 3.3V; only VCCIF pins (18,19) are elevated, as confirmed in the "AC Electrical Characteristics" table on page 3 of the 5542f datasheet.
What is the function of the CT pin (Pin 3) on LTC5542IUH#PBF?
The CT (center-tap) pin connects to the secondary winding midpoint of the internal RF transformer. It provides a 1.2V DC bias node for optional bypass capacitor placement to suppress LO-related noise coupling. While not required for basic operation, it improves RF input match stability across frequency - especially critical in broadband applications per Figure 3 and Applications Information section.
Does LTC5542IUH#PBF require external matching for 50Ω RF input impedance?
Yes - LTC5542IUH#PBF requires external matching to achieve >12dB RF input return loss across 1.6–2.7GHz. The datasheet specifies use of series capacitor C1 (22pF) and shunt capacitor C11 (0.7pF) at Pin 2, as shown in Figure 3 and validated in Figure 4. Without these, S11 degrades significantly - e.g., 0.35 magnitude at 1.6GHz implies only ~9dB return loss.
LTC5542IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- RF Type:
- CDMA, LTE, W-CDMA, WiMAX
- Frequency:
- 1.6GHz ~ 2.7GHz
- Number of Mixers:
- 1
- Gain:
- 8dB
- Noise Figure:
- 9.9dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 199mA
- Voltage - Supply:
- 3.1V ~ 3.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (5x5)
LTC5542IUH#PBF FAQ
1.How can I place an order for LTC5542IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5542IUH#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 LTC5542IUH#PBF reliable?
The price and inventory of LTC5542IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5542IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC5542IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5542IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5542IUH#PBF?
LTC5542IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5542IUH#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 LTC5542IUH#PBF?
For technical support, including LTC5542IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5542IUH#PBF requirements.
6.How does Aetrix verify that LTC5542IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC5542IUH#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 LTC5542IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC5542IUH#PBF?
All LTC5542IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5542IUH#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 LTC5542IUH#PBF part is unused and in its original packaging.
Return procedure for LTC5542IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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