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Analog Devices Inc. HMC798LC4
- Part No.:
- HMC798LC4
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
HMC798LC4.pdf
- Description:
- IC MMIC MIXER SUB-HARM 24SMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
HMC798LC4 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC sub-harmonically pumped (x2) mixer with integrated LO amplifier, operating RF from 24–34 GHz, LO from 12–17.75 GHz, and IF from DC to 4 GHz. It delivers 10–13 dB conversion loss, 30 dB 2LO-to-RF isolation, and requires only +5 V @ 95 mA - enabling compact, high-isolation upconversion in millimeter-wave radios.
For engineers reviewing the HMC798LC4 datasheet, HMC798LC4 pinout, HMC798LC4 application, or HMC798LC4 equivalent, this device is selected for its single-supply operation, wide IF bandwidth, excellent 2LO suppression, and surface-mount 4×4 mm package eliminating wire bonding - critical for production-ready 24–34 GHz transceivers.
Technical Context
The HMC798LC4 implements a sub-harmonic (x2) mixing architecture where the LO frequency is half the RF frequency, reducing LO generation complexity at mmWave bands. Its integrated +5 V LO amplifier accepts +4 dBm drive and provides sufficient gain to directly pump the mixer core without external amplification.
RF and LO ports are 50 Ω matched; IF is DC-coupled and supports baseband-to-4 GHz signals. The device operates over −40°C to +85°C, with thermal resistance of 119 °C/W junction-to-ground paddle - requiring direct soldering of all ground leads and the exposed paddle to PCB RF ground per package notes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 24–34 GHz - covers E-band point-to-point and SATCOM uplink bands. |
| LO Frequency Range | 12–17.75 GHz - enables x2 sub-harmonic pumping with relaxed LO synthesis requirements. |
| IF Bandwidth | DC to 4 GHz - supports widebaseband modulation schemes including OFDM and QAM without IF filtering constraints. |
| Conversion Loss | 10–13 dB typical - defines signal path attenuation; impacts system noise figure and required IF gain staging. |
| 2LO to RF Isolation | 25–30 dB - suppresses second harmonic LO leakage into RF path, reducing need for external filtering. |
| Supply Voltage / Current | +5 V @ 95 mA - single positive rail simplifies power delivery; low quiescent current aids thermal management. |
| IIP3 | 17–22 dBm - determines linearity headroom for multi-carrier or high-PAPR waveforms in VSAT and radar. |
| Package Size | 4 × 4 mm SMT - compact footprint compatible with high-density RF PCB layouts and automated assembly. |
Pinout & Package
Package: 24-lead leadless ceramic SMT package (alumina body, gold-over-nickel plating), 4 × 4 mm footprint, MSL3, with exposed ground paddle requiring solder connection to PCB RF ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 6, 7, 9, 12–14, 16, 18, 19, 24) | RF/DC Ground Reference | Must be soldered to PCB ground plane; forms return path for RF, IF, and supply currents - critical for isolation and impedance matching. |
| N/C (Pins 2, 3, 10, 17, 20–23) | No Internal Connection | Not bonded internally; measured data assumes external grounding - recommended for mechanical stability and thermal conduction. |
| IF (Pin 5) | Differential IF Input/Output | DC-coupled; requires external series capacitor for AC coupling - value chosen per lowest IF frequency (e.g., ≥100 pF for 100 MHz). |
| RF (Pin 8) | RF Port | DC-coupled, 50 Ω matched; connects to antenna or PA/LNA chain - no external DC blocking needed. |
| Vcc (Pin 11) | LO Amplifier Supply | +5 V input for integrated LO amplifier; bypass with 100 pF (C1) and 10,000 pF (C2) capacitors per evaluation board layout. |
| LO (Pin 15) | LO Input | DC-blocked, 50 Ω matched; accepts +4 dBm nominal drive - external bias tee or AC coupling required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO amplifier | Eliminates external LO buffer stage, reducing bill-of-materials and board area while maintaining +4 dBm drive requirement. |
| Sub-harmonic (x2) pumping | Halves required LO frequency versus fundamental mixing - eases LO synthesis at 24–34 GHz using mature 12–18 GHz sources. |
| 2LO-to-RF isolation ≥30 dB | Reduces or removes need for external 2LO bandstop filters at RF port, simplifying front-end design and improving size/cost. |
| DC–4 GHz IF bandwidth | Supports zero-IF and low-IF architectures with wide instantaneous bandwidth - suitable for high-data-rate modems and test instrumentation. |
| Leadless 4×4 mm RoHS SMT package | Enables reflow-compatible assembly without wire bonds; exposed paddle ensures low thermal resistance (119 °C/W) for sustained mmWave operation. |
Applications
| Point-to-Point Radios | VSAT Terminals |
|---|---|
|
Use Scenario: High-capacity licensed E-band backhaul links operating at 24–34 GHz with OFDM modulation and adaptive coding. IC Role / Device Role / Timing Role: Upconverter mixer translating baseband/IF signals to RF band with minimal added noise and distortion. Use Value: 10–13 dB conversion loss and 17–22 dBm IIP3 maintain link budget and spectral efficiency across temperature (-40°C to +85°C). |
Use Scenario: Outdoor satellite terminal transmit chain requiring compact, reliable mmWave upconversion for Ka-band uplinks. IC Role / Device Role / Timing Role: RF front-end mixer driven by sub-harmonic LO to avoid high-frequency LO generation complexity. Use Value: Integrated LO amplifier and 30 dB 2LO-to-RF isolation reduce external component count and filter requirements in constrained enclosures. |
| Military Radar Sensors | Millimeter-Wave Test Equipment |
|
Use Scenario: FMCW radar transceiver modules operating at 28 GHz for perimeter surveillance or altimetry. IC Role / Device Role / Timing Role: Core mixer in compact, thermally stable RF section supporting fast chirp rates and wide IF bandwidth. Use Value: DC–4 GHz IF bandwidth captures full beat signal spectrum; 4×4 mm SMT package enables dense array integration. |
Use Scenario: Vector signal analyzer or synthesizer front-end requiring calibrated, repeatable mmWave mixing performance. IC Role / Device Role / Timing Role: Precision upconverter/downconverter in metrology-grade instrument signal paths. Use Value: Stable conversion loss vs. temperature and low spurious output (<−30 dBc) ensure measurement fidelity across frequency sweeps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sub-harmonic mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC1048LC4 | Wider RF range (22–38 GHz), higher conversion loss (12–15 dB), no integrated LO amplifier - requires external LO driver. | Better suited for ultra-wideband test equipment needing extended coverage beyond 34 GHz. | Select HMC1048LC4 when RF bandwidth >34 GHz is mandatory and external LO buffering is acceptable. |
| Qorvo QM11020 | Similar 24–34 GHz RF range, but uses fundamental mixing (not sub-harmonic); requires 24–34 GHz LO source. | Preferred where LO synthesis at RF frequency is available and 2LO suppression is less critical than absolute conversion loss. | Choose QM11020 when fundamental LO architecture aligns with existing synthesizer design and lower conversion loss (~9 dB) is prioritized. |
Compared with HMC798LC4, HMC1048LC4 trades integrated LO functionality for wider RF bandwidth, while QM11020 offers lower conversion loss at the cost of requiring full-band LO generation - making HMC798LC4 optimal for space-constrained, LO-simplification designs in 24–34 GHz radios.
Availability
HMC798LC4 is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and military radar sensors requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for HMC798LC4 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 communications, defense, and instrumentation.
The HMC798LC4 belongs to Hittite's legacy GaAs MMIC mixer product line, designed specifically for sub-harmonic upconversion in E-band wireless infrastructure and ruggedized RF systems.
FAQ
What is the recommended LO drive level for the HMC798LC4?
The HMC798LC4 specifies a nominal +4 dBm LO drive level at the LO pin (Pin 15), with typical performance validated at ±2 dBm variation. Driving below +2 dBm increases conversion loss and degrades IP3; exceeding +6 dBm risks compression and may reduce reliability. The integrated LO amplifier is optimized for this range, eliminating need for external gain stages in most implementations.
Can the HMC798LC4 be used as a downconverter?
Yes, the HMC798LC4 supports bidirectional operation and is characterized as both upconverter and downconverter. When used as a downconverter, RF remains the 24–34 GHz input, IF becomes the DC–4 GHz output, and LO is still applied at half-RF (12–17.75 GHz). Conversion loss, isolation, and linearity specs apply equivalently in either mode per datasheet measurements.
Is DC blocking required on the LO pin of the HMC798LC4?
Yes - the LO pin (Pin 15) is DC-blocked internally, and external DC blocking (e.g., via bias tee or series capacitor) is mandatory. Applying DC voltage to Pin 15 will cause die non-function and possible permanent failure. Evaluation board design uses AC coupling consistent with this requirement.
What is the thermal management requirement for the HMC798LC4?
The HMC798LC4 has a junction-to-ground-paddle thermal resistance of 119 °C/W. To maintain operation within −40°C to +85°C case temperature, the exposed ground paddle and all GND pins (1, 4, 6, 7, 9, 12–14, 16, 18, 19, 24) must be soldered to a low-impedance, multi-via PCB ground plane. Use of thermal vias and optional heatsinking is recommended for continuous high-power operation.
Does the HMC798LC4 require external matching networks?
No - RF (Pin 8), LO (Pin 15), and IF (Pin 5) ports are internally matched to 50 Ω. RF and LO are broadband 50 Ω matched; IF is DC-coupled but requires external series capacitor for AC coupling. No external baluns, transformers, or tuning stubs are needed for nominal operation, simplifying layout and validation.
HMC798LC4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TFQFN Exposed Pad
- Packaging:
- Bulk
- 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)
HMC798LC4 FAQ
1.How can I place an order for HMC798LC4 through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC798LC4 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 HMC798LC4 reliable?
The price and inventory of HMC798LC4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC798LC4 is usually 5 days.
3.What payment methods are accepted for HMC798LC4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC798LC4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC798LC4?
HMC798LC4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC798LC4 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 HMC798LC4?
For technical support, including HMC798LC4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC798LC4 requirements.
6.How does Aetrix verify that HMC798LC4 is sourced from the original manufacturer or authorized distributors?
All HMC798LC4 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 HMC798LC4 meets industry standards.
7.What is the process for return or replacement of HMC798LC4?
All HMC798LC4 units undergo pre-shipment inspection (PSI). If there is an issue with HMC798LC4, 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 HMC798LC4 part is unused and in its original packaging.
Return procedure for HMC798LC4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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