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Analog Devices Inc. LTC5548IUDB#PBF
- Part No.:
- LTC5548IUDB#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC5548IUDB#PBF.pdf
- Description:
- IC MIXER 2GHZ-14GHZ 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
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Product details
Overview
LTC5548IUDB#PBF from Analog Devices (formerly Linear Technology) is a high-performance microwave double-balanced passive mixer IC designed for frequency upconversion or downconversion in 2GHz–14GHz RF systems. It features integrated LO buffer (0dBm drive), selectable LO frequency doubler, DC–6GHz differential IF port, +24.4dBm IIP3 at 5.8GHz, and 7.1dB conversion loss at 5.8GHz - enabling compact, high-linearity transceiver designs for C/X/Ku-band radar and wireless backhaul.
For engineers reviewing the LTC5548IUDB#PBF datasheet, LTC5548IUDB#PBF pinout, LTC5548IUDB#PBF application, or LTC5548IUDB#PBF equivalent, key selection considerations include its wideband IF support (DC–6GHz), low LO-to-RF leakage (<–30dBm), fast 0.2μs turn-on time for TDD operation, and 3mm × 2mm 12-lead QFN package with exposed thermal pad.
Technical Context
The LTC5548IUDB#PBF integrates a double-balanced passive mixer core, broadband RF balun (2–14GHz), LO amplifier (1–12GHz), and digitally controlled LO frequency doubler. Its differential IF interface supports DC-coupled baseband or wideband IF signals up to 6GHz, making it suitable for both zero-IF and low-IF architectures.
Operation supports low-side or high-side LO injection in upconversion or downconversion modes. The EN pin enables fast power gating (0.2μs on, 0.1μs off), while X2 pin selects doubler state - both CMOS-compatible with internal 376kΩ pull-down resistors and <30μA input current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 2GHz to 14GHz - covers full C-band (4–8GHz), X-band (8–12GHz), and Ku-band (12–18GHz) radar and comms. |
| IF Frequency Range | DC to 6GHz - supports baseband I/Q, low-IF, and wideband IF interfaces without external IF balun for differential use. |
| LO Frequency Range | 1GHz to 12GHz - enables flexible LO planning; doubler extends effective LO range to 0.5–6GHz when enabled. |
| IIP3 (5.8GHz) | +24.4dBm - delivers high linearity for multi-carrier and high-order modulation in point-to-point microwave links. |
| Conversion Loss | 7.1dB at 5.8GHz - defines signal path attenuation; stable over temperature (0.006dB/°C drift). |
| LO Drive Level | 0dBm typical - eliminates need for external LO amplification in most 5G/mmWave front-end designs. |
| Supply Voltage | 3.3V ±0.3V - compatible with standard LDOs; draws 120mA (X2 off) or 136mA (X2 on) during active operation. |
Pinout & Package
Package: 12-lead (3mm × 2mm) plastic QFN with exposed thermal pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 6, 10, 12, 13) | Ground reference | Multiple dedicated ground pins + exposed pad ensure low-inductance RF grounding and thermal dissipation (θJC = 25°C/W). |
| IF+, IF– (Pins 2, 3) | Differential IF interface | 25Ω parallel impedance per pin; supports DC-coupled IF signals up to 6GHz; requires external balun for single-ended IF. |
| RF (Pin 5) | Single-ended RF port | Internally connected to primary of integrated transformer; 50Ω matched from 2–14GHz with 0.15pF shunt capacitor; DC-blocking cap required if RF source has DC offset. |
| EN (Pin 7) | Enable control | CMOS-compatible logic input; >1.2V = enabled (120mA supply current); <0.3V = shutdown (100μA); internal 376kΩ pull-down. |
| X2 (Pin 8) | LO doubler control | Digital select for integrated LO frequency doubler; >1.2V = enabled (adds 2× LO multiplication); <0.3V = bypassed; internal 376kΩ pull-down. |
| VCC (Pin 9) | Power supply | 3.3V regulated input; requires local 1µF bypass capacitor; supplies LO amp, mixer core, and bias circuits. |
| LO (Pin 11) | Local oscillator input | Single-ended 50Ω port; DC voltage ~1.6V; requires series DC-blocking capacitor; accepts –6 to +6dBm LO drive. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO buffer amplifier | Enables 0dBm LO drive requirement - reduces external component count and LO chain complexity in microwave transceivers. |
| Selectably enabled LO frequency doubler | Allows flexible LO synthesis: direct 1–12GHz LO or halved 0.5–6GHz LO with same RF/IF performance trade-offs. |
| DC–6GHz differential IF port | Supports true zero-IF I/Q demodulation and wideband IF sampling without external IF balun - simplifies baseband interface design. |
| Low LO-to-RF leakage | <–30dBm (1–5GHz LO) - minimizes LO feedthrough into antenna path, critical for FDD/TDD coexistence and radar clutter suppression. |
| Fast enable/disable timing | 0.2μs turn-on / 0.1μs turn-off - meets stringent TDD frame timing requirements in 5G FR2 and satellite modem applications. |
Applications
| Phased-Array Radar Beamforming | Point-to-Point Microwave Backhaul |
|---|---|
Use Scenario: Active electronically scanned array (AESA) radar with distributed T/R modules operating in X-band (8–12GHz). IC Role / Device Role / Timing Role: Downconversion mixer in receive channel; converts RF echoes to baseband I/Q for digital beamforming. Use Value: DC–6GHz IF bandwidth enables direct sampling of wide instantaneous bandwidths; +24.4dBm IIP3 maintains dynamic range under strong clutter interference. | Use Scenario: 5G fixed wireless access (FWA) link operating at 28GHz with 500MHz channel bandwidth. IC Role / Device Role / Timing Role: Upconversion mixer in transmit chain; translates baseband OFDM symbols to RF carrier. Use Value: 7.1dB conversion loss and low LO leakage preserve EVM and ACLR; fast EN switching supports burst-mode transmission. |
| Satellite Modem IF Interface | C/X-Band Test Equipment |
Use Scenario: LEO satellite user terminal requiring DC-coupled I/Q modulation/demodulation for Doppler-tolerant waveforms. IC Role / Device Role / Timing Role: Dual-role mixer supporting both upconversion (Tx) and downconversion (Rx) in half-duplex mode. Use Value: DC–6GHz IF range accommodates wide symbol rates and pilot tones; differential IF reduces common-mode noise in space-constrained PCB layouts. | Use Scenario: Portable microwave signal analyzer front-end covering 2–14GHz with programmable IF output. IC Role / Device Role / Timing Role: Core downconversion element; provides calibrated IF output to ADC stage. Use Value: Stable conversion loss (±0.006dB/°C) ensures measurement repeatability across environmental chambers; 50Ω RF/LO ports simplify calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microwave mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC1040LP3E | Wider RF range (2–20GHz), higher conversion loss (8.5dB @ 10GHz), no integrated LO doubler or enable pin. | Requires external LO buffer and enable circuitry; better suited for wideband test equipment than power-constrained TDD radios. | Choose HMC1040LP3E when extended RF coverage beyond 14GHz is required and board space allows discrete LO conditioning. |
| LTC5549IUDB#PBF | Same RF/LO specs but includes integrated IF balun; IF range limited to 500MHz–6GHz (no DC coupling). | Optimized for high-side LO injection above 500MHz IF; not suitable for zero-IF or baseband applications. | Choose LTC5549IUDB#PBF only when IF >500MHz is guaranteed and DC-coupled IF is unnecessary - avoids unused IF balun overhead. |
Compared with HMC1040LP3E and LTC5549IUDB#PBF, the LTC5548IUDB#PBF uniquely combines DC–6GHz IF capability, integrated LO doubler, and fast enable control in a 3mm × 2mm package - making it the optimal choice for compact, low-power, zero-IF radar and satellite modems.
Availability
LTC5548IUDB#PBF is available at Aetrix Electronics and suitable for phased-array radar, point-to-point microwave backhaul, and satellite modem applications requiring stable component supply, extended temperature operation (–40°C to 105°C), and lead-free compliance.
Supply support for LTC5548IUDB#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, 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 LTC5548IUDB#PBF belongs to ADI's high-frequency mixer product line, engineered specifically for microwave communication and radar systems demanding wide IF bandwidth, high linearity, and integration of LO conditioning functions.
FAQ
What is the minimum IF frequency supported by the LTC5548IUDB#PBF?
The LTC5548IUDB#PBF supports true DC-coupled IF operation - its differential IF port (Pins 2 and 3) is specified from DC to 6GHz. This enables zero-IF receiver architectures and baseband I/Q signal processing without AC-coupling constraints or external IF transformers.
Does the LTC5548IUDB#PBF require an external LO amplifier?
No - the LTC5548IUDB#PBF integrates an LO buffer amplifier optimized for 1–12GHz operation and requires only 0dBm LO drive. External amplification is unnecessary unless LO source power falls below –6dBm or exceeds +6dBm, where performance may degrade.
Can the LTC5548IUDB#PBF be used in both upconversion and downconversion modes?
Yes - the LTC5548IUDB#PBF is a bidirectional double-balanced mixer. It operates in downconversion (RF in → IF out) and upconversion (IF in → RF out) modes, supporting both low-side and high-side LO injection as confirmed in its AC Electrical Characteristics tables and Applications Information section.
What is the thermal resistance (θJC) of the LTC5548IUDB#PBF package?
The LTC5548IUDB#PBF in the 12-lead 3mm × 2mm QFN package has a junction-to-case thermal resistance (θJC) of 25°C/W, as specified in the Absolute Maximum Ratings table. Proper soldering of the exposed pad (Pin 13) to a large PCB ground plane is required to achieve this rating.
Is the LTC5548IUDB#PBF pin-compatible with the LTC5549IUDB#PBF?
No - although both share the same UDB package footprint and pin count, the LTC5548IUDB#PBF and LTC5549IUDB#PBF differ in internal IF port architecture: LTC5548 has a DC–6GHz differential IF without integrated balun, while LTC5549 includes an integrated IF balun and omits DC coupling. Pin functions are identical, but system-level IF interface design differs significantly.
LTC5548IUDB#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Discontinued at Digi-Key
- RF Type:
- Radar
- Frequency:
- 2GHz ~ 14GHz
- Number of Mixers:
- 2
- Gain:
- -
- Noise Figure:
- 10.8dB
- Secondary Attributes:
- -
- Current - Supply:
- 136mA
- Voltage - Supply:
- 3.3V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (3x2)
LTC5548IUDB#PBF FAQ
1.How can I place an order for LTC5548IUDB#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC5548IUDB#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 LTC5548IUDB#PBF reliable?
The price and inventory of LTC5548IUDB#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC5548IUDB#PBF is usually 5 days.
3.What payment methods are accepted for LTC5548IUDB#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC5548IUDB#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC5548IUDB#PBF?
LTC5548IUDB#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC5548IUDB#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 LTC5548IUDB#PBF?
For technical support, including LTC5548IUDB#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC5548IUDB#PBF requirements.
6.How does Aetrix verify that LTC5548IUDB#PBF is sourced from the original manufacturer or authorized distributors?
All LTC5548IUDB#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 LTC5548IUDB#PBF meets industry standards.
7.What is the process for return or replacement of LTC5548IUDB#PBF?
All LTC5548IUDB#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC5548IUDB#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 LTC5548IUDB#PBF part is unused and in its original packaging.
Return procedure for LTC5548IUDB#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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