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Analog Devices Inc. HMC798LC4TR
- Part No.:
- HMC798LC4TR
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
HMC798LC4TR.pdf
- Description:
- IC MMIC MIXER SUB-HARM 24SMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,661
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Product details
Overview
HMC798LC4TR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC sub-harmonically pumped (×2) mixer with integrated LO amplifier, operating 24–34 GHz RF, 12–17.75 GHz LO, and DC–4 GHz IF. It delivers 10–13 dB conversion loss, 30 dB 2LO-to-RF isolation, and +5 V single-supply operation at 95 mA, enabling compact upconverter designs in millimeter-wave radios.
For engineers reviewing the HMC798LC4TR datasheet, HMC798LC4TR pinout, HMC798LC4TR application, or HMC798LC4TR equivalent, key selection criteria include its 24–34 GHz RF bandwidth, integrated +4 dBm LO drive requirement, 4×4 mm leadless SMT package, and suitability for SATCOM upconverters requiring minimal external filtering.
Technical Context
The HMC798LC4TR implements a sub-harmonic (×2) mixing architecture where the LO frequency is half the RF frequency, reducing LO generation complexity in E-band systems. Its integrated GaAs LO amplifier accepts +4 dBm input and drives the mixer core directly, eliminating external LO buffer stages.
RF and LO ports are internally matched to 50 Ω, while the DC-coupled IF port supports baseband-to-4 GHz operation. The device operates as an upconverter by default (IF = 1 GHz, LO = 4 dBm), with spurious output suppression verified across mIF/nLO combinations including 2LO±1IF and 1LO±1IF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 24–34 GHz - Covers full E-band (24–40 GHz) lower segment for point-to-point links. |
| LO Frequency Range | 12–17.75 GHz - Enables ×2 sub-harmonic pumping; eliminates need for 24–34 GHz LO source. |
| IF Bandwidth | DC–4 GHz - Supports wide IF bandwidths including 1–3 GHz modulated signals without AC coupling constraints. |
| Conversion Loss | 10–13 dB typical - Defines signal path attenuation; impacts system noise figure and gain budget. |
| 2LO-to-RF Isolation | 25–30 dB - Reduces need for external 2LO filtering at RF port, simplifying front-end design. |
| Input IP3 | 17–22 dBm - Determines linearity headroom for multi-carrier or high-PAPR waveforms. |
| Supply Current | 95 mA @ +5 V - Enables low-power biasing; thermal dissipation managed via ground paddle soldering. |
Pinout & Package
Package: 24-lead, 4×4 mm leadless ceramic SMT package (alumina body, gold-over-nickel plating, MSL3). Ground paddle must be soldered to PCB RF ground per datasheet Note 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 6, 7, 9, 12–14, 16, 18, 19, 24 | GND | RF/DC ground terminals; all must connect to solid ground plane for impedance control and thermal conduction. |
| 2, 3, 10, 17, 20–23 | N/C | No internal connection; externally grounded during characterization but not required for operation. |
| 5 | IF | DC-coupled IF port; requires external series capacitor for AC coupling if DC blocking needed. |
| 8 | RF | DC-coupled 50 Ω RF port; matches standard mmWave test fixtures without external matching. |
| 11 | Vcc | +5 V supply for integrated LO amplifier; decoupling required near pin per evaluation board layout. |
| 15 | LO | DC-blocked 50 Ω LO port; accepts +4 dBm nominal drive; no DC bias path to die. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO amplifier | Eliminates external LO buffer stage; reduces bill-of-materials and layout area in E-band transceivers. |
| Sub-harmonic (×2) pumping | Lowers LO synthesis complexity: 12–17.75 GHz LO generates 24–34 GHz RF, easing oscillator design. |
| 2LO-to-RF isolation ≥30 dB | Minimizes 2LO leakage into antenna path, reducing need for bandpass filtering before power amplification. |
| DC-coupled IF port | Supports zero-IF and low-IF architectures without transformer or balun; enables direct ADC interface. |
| Leadless 4×4 mm RoHS SMT package | Enables automated assembly and high-density RF PCB layouts; ground paddle improves thermal and RF grounding. |
Applications
| Point-to-Point Radios | SATCOM Terminals |
|---|---|
Use Scenario: High-capacity backhaul links operating in 24–28 GHz licensed bands. IC Role / Device Role / Timing Role: Upconverter in transmit chain, translating IF-modulated signals to RF band. Use Value: 30 dB 2LO-to-RF isolation avoids additional filter stages, reducing insertion loss and size. |
Use Scenario: Mobile satellite communication terminals requiring compact, high-linearity E-band upconversion. IC Role / Device Role / Timing Role: RF mixer in LNB or transmit module, supporting wide IF bandwidth for multi-channel modulation. Use Value: DC–4 GHz IF bandwidth accommodates 2–3 GHz wide digitally modulated carriers without IF limiting. |
| Test Equipment Front-Ends | Military Radar Sensors |
Use Scenario: Signal generator and spectrum analyzer front-ends needing broadband mmWave translation. IC Role / Device Role / Timing Role: Active mixer in receiver/transmitter calibration path with known conversion loss. Use Value: 10–13 dB conversion loss and ±1 dB flatness over 24–34 GHz enable accurate amplitude reference paths. |
Use Scenario: Compact active electronically scanned array (AESA) radar T/R modules operating at 28 GHz. IC Role / Device Role / Timing Role: Sub-harmonic upconverter in distributed transmit channel with integrated LO drive. Use Value: Integrated +4 dBm LO amplifier reduces component count and interconnect loss in dense T/R tile layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sub-harmonic mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC1048LP4E | Wider RF range (17–44 GHz), higher conversion loss (14 dB typ), no integrated LO amp. | Requires external LO buffer; better suited for lab-grade wideband test equipment than compact radios. | Select when broader RF coverage outweighs integration and power efficiency needs. |
| Qorvo QM11030 | Similar 24–34 GHz RF range, 12–17 GHz LO, but uses different GaAs process; 11 dB conversion loss, no integrated LO amp. | Needs discrete LO driver; optimized for high-volume 5G FWA infrastructure with tighter production tolerances. | Select for cost-sensitive, high-volume deployments where external LO buffering is already standardized. |
Compared with HMC798LC4TR, HMC1048LP4E offers wider bandwidth at the expense of higher loss and no LO integration, while QM11030 provides comparable RF performance but shifts design burden to external LO drive-making HMC798LC4TR optimal for space-constrained, single-supply mmWave upconverters.
Availability
HMC798LC4TR is available at Aetrix Electronics and suitable for point-to-point radios, SATCOM terminals, and military radar sensors requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for HMC798LC4TR 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 Hittite Microwave in 2014 and maintains its high-frequency RF portfolio, specializing in mmWave ICs for defense, communications, and instrumentation.
The HMC798LC4TR belongs to Hittite's legacy GaAs MMIC mixer product line, designed specifically for E-band sub-harmonic upconversion in size- and power-constrained wireless infrastructure.
FAQ
What is the recommended LO drive level for the HMC798LC4TR?
The HMC798LC4TR is specified for +4 dBm nominal LO drive at the LO pin (Pin 15), with performance validated across 2–6 dBm. Operating below +2 dBm increases conversion loss and degrades IP3; exceeding +6 dBm risks compression and potential damage. The integrated LO amplifier is optimized for this drive level, making external amplification unnecessary in most implementations.
Does the HMC798LC4TR require external DC blocking on the LO port?
Yes, the LO port (Pin 15) is DC-blocked internally, so no external DC blocking capacitor is required. However, the IF port (Pin 5) is DC-coupled and must be externally DC-blocked using a series capacitor sized for the target IF bandwidth (e.g., 100 pF for 1–4 GHz). Applying DC voltage to Pin 5 will cause non-function or permanent die failure.
Can the HMC798LC4TR be used as a downconverter?
Yes, the HMC798LC4TR supports bidirectional operation. As a downconverter, it accepts RF input (24–34 GHz), applies sub-harmonic LO (12–17.75 GHz), and outputs IF (DC–4 GHz). Conversion loss and isolation specs remain valid, though system-level noise figure and dynamic range must be re-evaluated based on IF chain design and LO phase noise.
What is the thermal management requirement for the HMC798LC4TR?
The HMC798LC4TR has a junction-to-ground-paddle thermal resistance of 119 °C/W and maximum channel temperature of 175 °C. To maintain reliability at full load (95 mA @ +5 V), the exposed ground paddle must be fully soldered to a thermally robust PCB ground plane with ≥6 thermal vias (0.3 mm diameter) connecting to inner/outer ground layers. No heatsink is required for ambient ≤+85 °C with proper PCB layout.
Is the HMC798LC4TR pin-compatible with other Hittite 4×4 mm mixers like the HMC774LC4?
No, the HMC798LC4TR is not pin-compatible with HMC774LC4 or other 4×4 mm Hittite mixers. Pin functions differ significantly: HMC798LC4TR uses Pin 11 for Vcc and Pin 15 for LO, whereas HMC774LC4 assigns Vcc to Pin 20 and LO to Pin 1. Layout reuse is not possible without redesign; refer to each device's specific pin description table for routing.
HMC798LC4TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- RF Type:
- General Purpose
- Frequency:
- 24GHz ~ 34GHz
- Number of Mixers:
- 1
- Gain:
- -
- Noise Figure:
- -
- Secondary Attributes:
- -
- Current - Supply:
- 95mA
- Voltage - Supply:
- 5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
HMC798LC4TR FAQ
1.How can I place an order for HMC798LC4TR through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC798LC4TR 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 HMC798LC4TR reliable?
The price and inventory of HMC798LC4TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC798LC4TR is usually 5 days.
3.What payment methods are accepted for HMC798LC4TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC798LC4TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC798LC4TR?
HMC798LC4TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC798LC4TR 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 HMC798LC4TR?
For technical support, including HMC798LC4TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC798LC4TR requirements.
6.How does Aetrix verify that HMC798LC4TR is sourced from the original manufacturer or authorized distributors?
All HMC798LC4TR 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 HMC798LC4TR meets industry standards.
7.What is the process for return or replacement of HMC798LC4TR?
All HMC798LC4TR units undergo pre-shipment inspection (PSI). If there is an issue with HMC798LC4TR, 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 HMC798LC4TR part is unused and in its original packaging.
Return procedure for HMC798LC4TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC798LC4TR Tags
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MAX2671EUT+T
Analog Devices Inc./Maxim Integrated
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ADEX-10+
Mini-Circuits
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ADE-2+
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ADE-1+
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LT5560EDD#PBF
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LT5560EDD#TRPBF
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LTC5562IUC#TRPBF
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MAX2681EUT+T
Analog Devices Inc./Maxim Integrated
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ADE-1ASK+
Mini-Circuits
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ADE-1L+
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ADL5350ACPZ-R7
Analog Devices Inc.
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AD608ARZ-RL
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