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Analog Devices Inc. 112261-HMC738LP4
- Part No.:
- 112261-HMC738LP4
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
112261-HMC738LP4.pdf
- Description:
- BOARD EVAL HMC738LP4E
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
The 112261-HMC738LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs InGaP HBT MMIC voltage-controlled oscillator with integrated divide-by-16 prescaler and Fo/2 output. It operates from 20.9–23.9 GHz at RFOUT, delivers +9 dBm typical output power from a +5 V supply, exhibits –95 dBc/Hz phase noise at 100 kHz offset, and is packaged in a 24-lead 4×4 mm QFN. It serves as the core frequency source in high-frequency point-to-point radio transceivers.
For engineers reviewing the 112261-HMC738LP4 datasheet, 112261-HMC738LP4 pinout, 112261-HMC738LP4 application, or 112261-HMC738LP4 equivalent, key selection criteria include its dual-output capability (RFOUT and RFOUT/2), integrated prescaler for PLL feedback, wide tuning voltage range (1–13 V), low pulling sensitivity (22 MHz pp into 2.0:1 VSWR), and guaranteed operation from –40°C to +85°C.
Technical Context
The 112261-HMC738LP4 integrates a monolithic resonator, negative resistance device, varactor diode, and a divide-by-16 prescaler on a single GaAs die-enabling stable oscillation without external tuning components. Its Fo/2 output is AC-coupled and provides a usable 10.45–11.95 GHz signal, while the prescaler output supports PLL loop division at 1.306–1.494 GHz.
Phase noise performance remains consistent across temperature (–40°C to +85°C) due to monolithic construction, and pushing is specified at –90 MHz/V at Vtune = 5 V. The device requires separate RF and digital supply rails (Vcc(RF) and Vcc(DIG)), with the latter optional if the prescaler is unused-reducing total current draw by ~100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range (RFOUT) | 20.9–23.9 GHz - full-band coverage suitable for E-band fixed wireless links |
| Output Power (RFOUT) | +9 dBm typical - sufficient to drive mixer LO ports without external amplification |
| SSB Phase Noise @ 100 kHz | –95 dBc/Hz typ. - meets stringent spectral purity requirements for high-order QAM modulation |
| Tuning Voltage Range | 1–13 V - enables wide loop bandwidth design with standard DAC or op-amp control circuits |
| Supply Current (Total) | 200 mA typ. at +5 V - includes both RF and digital sections; drops to ~100 mA if Vcc(DIG) is omitted |
| Package Size | 4×4 mm QFN, 24-lead - compact footprint compatible with high-density RF PCB layouts |
| Operating Temperature | –40°C to +85°C - qualified for outdoor base station and VSAT terminal environments |
Pinout & Package
24-lead leadless QFN package (4×4 mm body, exposed ground paddle); RoHS-compliant version marked H738 with 4-digit lot code; MSL1 rating; Sn/Pb finish for HMC738LP4 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5–9, 12–14, 18–19, 21, 23–24 | No Connect (NC) | Internally unconnected; may be tied to RF/DC ground without performance impact |
| 2 | RFOUT/16 | AC-coupled divided output at 1.306–1.494 GHz; requires external DC blocking capacitor |
| 4 | Vcc(DIG) | +5 V supply for internal prescaler; omitting this rail disables prescaler and saves ~100 mA |
| 10 | RFOUT/2 | AC-coupled half-frequency output at 10.45–11.95 GHz; usable as secondary LO source |
| 11, 15, 17 | GND | Ground terminals connected to exposed metal paddle; must be soldered to PCB ground plane |
| 16 | RFOUT | Main AC-coupled RF output at 20.9–23.9 GHz; requires external DC blocking capacitor |
| 20 | Vcc(RF) | +5 V supply for oscillator core; decoupling required per RF layout best practices |
| 22 | VTUNE | Control voltage input (1–13 V); modulation bandwidth depends on source impedance |
Key Features
| Feature | Design Value |
|---|---|
| No external resonator required | Monolithic GaAs integration eliminates discrete tank circuit, reducing BOM count and layout sensitivity |
| Dual RF outputs (Fo and Fo/2) | Enables simultaneous use of fundamental and half-frequency signals-e.g., main LO and auxiliary IF source-in single-chip architecture |
| Integrated divide-by-16 prescaler | Provides low-frequency feedback signal (1.3–1.5 GHz) compatible with commercial PLL ICs and FPGA-based synthesizers |
| Low phase noise over temperature | –95 dBc/Hz @ 100 kHz maintained from –40°C to +85°C-critical for stable E-band link budgets |
| High immunity to load pulling | 22 MHz peak-to-peak variation into 2.0:1 VSWR-reduces need for isolators in cost-sensitive radios |
Applications
| Point-to-Point Radios | VSAT Terminals |
|---|---|
Use Scenario: High-capacity backhaul links operating in the 24 GHz licensed band with 256-QAM modulation. IC Role / Device Role / Timing Role: Primary LO source for upconverter and downconverter stages, providing synchronized Fo and Fo/2 outputs. Use Value: Eliminates need for external frequency dividers or synthesizers-reducing bill-of-materials and board area while maintaining phase coherence. |
Use Scenario: Outdoor satellite modem units requiring stable local oscillator generation in harsh environmental conditions. IC Role / Device Role / Timing Role: Temperature-stable VCO delivering RFOUT for LNB downconversion and RFOUT/2 for intermediate frequency synthesis. Use Value: Monolithic construction ensures <±3.5 MHz/°C drift and <22 MHz pp pulling-minimizing link margin loss over operational temperature range. |
| Point-to-Multi-Point LMDS | Millimeter-Wave Test Equipment |
Use Scenario: Base station transceivers serving multiple subscriber units in 24–26 GHz spectrum with adaptive beamforming. IC Role / Device Role / Timing Role: Core frequency reference with integrated prescaler enabling fast PLL lock times and fine channel spacing. Use Value: VTUNE sensitivity of –90 MHz/V allows precise frequency resolution (<100 kHz step) using 12-bit DAC control. |
Use Scenario: Signal generator front-end modules requiring clean, tunable millimeter-wave sources for calibration and verification. IC Role / Device Role / Timing Role: Compact, self-contained VCO subsystem generating harmonically rich but phase-noise-optimized output for stimulus applications. Use Value: –23 dBc harmonic suppression and –40 dBc subharmonic rejection reduce filtering complexity in test head designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar VCO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC739LP4 | Same package and pinout; wider frequency range (22.2–25.4 GHz); higher phase noise (–92 dBc/Hz @ 100 kHz) | Better suited for 26 GHz LMDS uplinks where extended upper band coverage is required | Select HMC739LP4 only when >23.9 GHz operation is mandatory; otherwise, 112261-HMC738LP4 offers superior phase noise in shared 24 GHz bands |
| ADF4371BCPZ | Integrated PLL+VCO SiGe solution; lower frequency (6.5–32 GHz); includes SPI interface and fractional-N synthesizer | Replaces discrete PLL + VCO combinations; requires external loop filter and reference clock | Choose ADF4371BCPZ for programmable, digitally controlled synthesis; retain 112261-HMC738LP4 for analog-tuned, ultra-low-phase-noise standalone VCO use |
Compared with HMC739LP4, the 112261-HMC738LP4 delivers better phase noise in the 20.9–23.9 GHz band and tighter pulling specs; compared with ADF4371BCPZ, it avoids digital control overhead and offers faster analog tuning response-making it optimal for fixed-frequency or narrow-sweep high-performance RF systems.
Availability
112261-HMC738LP4 is available at Aetrix Electronics and suitable for point-to-point radios, VSAT terminals, and millimeter-wave test equipment requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for 112261-HMC738LP4 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 product lines, including MMIC VCOs, synthesizers, and microwave components for defense, communications, and instrumentation.
The 112261-HMC738LP4 belongs to Hittite's legacy MMIC VCO family-designed specifically for E-band wireless infrastructure where monolithic integration, thermal stability, and low phase noise are critical system-level requirements.
FAQ
What is the recommended power supply configuration for the 112261-HMC738LP4?
The 112261-HMC738LP4 requires two independent +5 V supplies: Vcc(RF) on Pin 20 powers the oscillator core, and Vcc(DIG) on Pin 4 powers the divide-by-16 prescaler. If the prescaler is unused, Vcc(DIG) may be left unconnected-reducing total current draw by ~100 mA. Decoupling capacitors (100 pF and 4.7 µF) must be placed near each supply pin per the evaluation board layout.
Can the 112261-HMC738LP4 operate without an external resonator?
Yes-the 112261-HMC738LP4 is a fully monolithic MMIC VCO integrating the resonator, varactor, negative resistance device, and prescaler on a single GaAs die. No external LC tank, crystal, or SAW resonator is required, simplifying design and improving reliability across temperature and vibration profiles.
What are the RF output interface requirements for the 112261-HMC738LP4?
All RF outputs (RFOUT, RFOUT/2, RFOUT/16) are AC-coupled and require external DC blocking capacitors. RFOUT and RFOUT/2 are matched to 50 Ω; RFOUT/16 has lower output power (–3.5 dBm typ.) and also requires 50 Ω termination. Output return loss is ≥3 dB across the band, and harmonic suppression is –23 dBc (2Fo) and –40 dBc (3Fo/2).
How does temperature affect the 112261-HMC738LP4's frequency stability?
The 112261-HMC738LP4 exhibits a frequency drift rate of 3.5 MHz/°C over –40°C to +85°C. Its monolithic GaAs structure minimizes process- and temperature-induced phase noise degradation-maintaining –95 dBc/Hz at 100 kHz offset across the full operating range, unlike hybrid or discrete VCOs that suffer greater thermal hysteresis.
Is the 112261-HMC738LP4 pin-compatible with other Hittite VCOs in the LP4 package?
No-the 112261-HMC738LP4 has a unique pin assignment optimized for its dual-output and prescaler functionality. While it shares the 24-lead 4×4 mm QFN footprint with other LP4 devices, pin functions (e.g., RFOUT/16 on Pin 2, RFOUT/2 on Pin 10) differ significantly from variants like HMC739LP4 or HMC740LP4. Always verify pinout against the official datasheet before PCB layout.
112261-HMC738LP4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Type:
- Voltage Controlled Oscillator (VCO)
- Frequency:
- 20.9GHz ~ 23.9GHz
- Contents:
- Board(s)
- Utilized IC / Part:
- HMC738LP4
112261-HMC738LP4 FAQ
1.How can I place an order for 112261-HMC738LP4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 112261-HMC738LP4 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 112261-HMC738LP4 reliable?
The price and inventory of 112261-HMC738LP4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 112261-HMC738LP4 is usually 5 days.
3.What payment methods are accepted for 112261-HMC738LP4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 112261-HMC738LP4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 112261-HMC738LP4?
112261-HMC738LP4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 112261-HMC738LP4 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 112261-HMC738LP4?
For technical support, including 112261-HMC738LP4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 112261-HMC738LP4 requirements.
6.How does Aetrix verify that 112261-HMC738LP4 is sourced from the original manufacturer or authorized distributors?
All 112261-HMC738LP4 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 112261-HMC738LP4 meets industry standards.
7.What is the process for return or replacement of 112261-HMC738LP4?
All 112261-HMC738LP4 units undergo pre-shipment inspection (PSI). If there is an issue with 112261-HMC738LP4, 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 112261-HMC738LP4 part is unused and in its original packaging.
Return procedure for 112261-HMC738LP4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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