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Analog Devices Inc. HMC686LP4E
- Part No.:
- HMC686LP4E
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
HMC686LP4E.pdf
- Description:
- IC MMIC MIXER BICMOS 24-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
HMC686LP4E from Analog Devices (formerly Hittite Microwave) is a high-dynamic-range BiCMOS double-balanced mixer with integrated LO amplifier, designed for RF downconversion and upconversion in cellular infrastructure. It operates across 0.7–1.1 GHz (high-side LO) and 1.4–1.5 GHz (low-side LO), delivers +34 dBm input IP3, 7.5 dB typical conversion loss, and DC–500 MHz IF bandwidth - ideal for LTE/WiMAX base station receivers and transmitters.
For engineers reviewing the HMC686LP4E datasheet, HMC686LP4E pinout, HMC686LP4E application, or HMC686LP4E equivalent, key selection criteria include its dual-band LO optimization, adjustable G_BIAS for linearity–loss trade-off, integrated LO amplifier eliminating external driver stages, and 24-lead 4×4 mm QFN package with RF-grounded paddle.
Technical Context
The HMC686LP4E implements a passive MMIC mixer core with on-chip baluns and an integrated LO buffer amplifier, enabling direct 0 dBm LO drive without external amplification. Its RF and LO ports are single-ended 50 Ω matched, while IF is differential 50 Ω, supporting both DC-coupled and AC-coupled configurations.
It supports two distinct operational modes: high-side LO injection for 0.7–1.1 GHz RF band (e.g., GSM/CDMA downconversion), and low-side LO injection for 1.4–1.5 GHz LTE band (e.g., TDD-LTE upconversion), with independent biasing (G_BIAS = 3.5 V or 2.5 V) and supply current tuning via R9 to optimize IP3, P1dB, and conversion gain per application.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 0.7–1.1 GHz (high-side LO) and 1.4–1.5 GHz (low-side LO); enables dual-band reuse in multi-standard base stations. |
| IF Bandwidth | DC to 500 MHz; supports wideband OFDM signals and DC-coupled I/Q demodulation paths. |
| Conversion Loss | 7.5 dB typical at 0 dBm LO; low loss reduces system noise figure and relaxes LNA gain requirements. |
| Input IP3 | +34 dBm typical at 0.7–1.1 GHz; handles strong interferers in dense cellular environments without distortion. |
| LO–RF Isolation | 26 dB min; minimizes LO leakage into antenna path, easing front-end filter requirements. |
| Supply Current | 60–120 mA (adjustable via R9); allows power–performance scaling for thermal-constrained designs. |
| G_BIAS Range | 0–5 V (internal 15 kΩ pull-down); enables real-time linearity–conversion-loss trade-off in adaptive systems. |
Pinout & Package
Package: 24-lead, 4 mm × 4 mm, RoHS-compliant QFN with exposed ground paddle (MSL1, 260 °C peak reflow). Requires soldering of all ground leads and paddle to PCB RF ground plane for optimal thermal and RF performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6, 7, 11–14, 18, 20, 23 | No Connection | May be tied to RF ground; no electrical function, but improves mechanical stability and thermal conduction. |
| 2, 5, 15, 17 | Ground | RF/DC ground reference; must connect directly to PCB ground plane with multiple vias. |
| 3 | RF Input | Single-ended 50 Ω matched RF port; internally DC-short via balun - no external DC blocking required. |
| 4 | RF Balun Tap | Center tap of internal RF balun secondary; must be shorted to ground with zero-ohm resistor near package. |
| 8, 10, 24 | Vcc1/Vcc2/Vcc3 | Three independent 5 V supply pins; decoupling required per application circuit to suppress supply noise coupling. |
| 9 | LO_BIAS | LO buffer current control; 330 Ω to ground sets nominal 105 mA total Icc - adjusts LO drive strength and linearity. |
| 16 | LO Input | Single-ended 50 Ω matched LO port; internally DC-short via balun - no external DC blocking required. |
| 19 | G_BIAS | External gate bias control; 3.5 V sets nominal operation; varying voltage trades conversion loss vs. IP3/P1dB. |
| 21, 22 | IFP / IFN | Differential 50 Ω IF interface; supports true differential signal processing or single-ended use with termination. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO amplifier | Eliminates need for external LO driver stage, reducing BOM count, board area, and LO phase noise degradation. |
| Dual-band LO optimization | Supports both high-side LO (0.7–1.1 GHz) and low-side LO (1.4–1.5 GHz) configurations in same device - simplifies multi-band radio design. |
| Adjustable G_BIAS and LO_BIAS | Enables dynamic optimization of linearity (IP3), compression (P1dB), and conversion loss without hardware change. |
| DC–500 MHz IF bandwidth | Accommodates zero-IF and low-IF architectures, including wideband LTE 20 MHz channels and legacy GSM/CDMA signals. |
| 24-lead 4×4 mm QFN with ground paddle | Provides low thermal resistance (52 °C/W), high RF grounding integrity, and compact footprint for dense RF modules. |
Applications
| Cellular Base Station Receiver | LTE TDD Transmitter |
|---|---|
Use Scenario: Downconverting 0.8–0.9 GHz GSM/CDMA signals to 150 MHz IF in macrocell BTS. IC Role / Device Role / Timing Role: Double-balanced mixer with integrated LO amplifier performing RF-to-IF translation and image rejection. Use Value: +34 dBm IP3 prevents intermodulation from adjacent channel interferers; 7.5 dB conversion loss maintains system NF budget. | Use Scenario: Upconverting 140 MHz IF to 1.4–1.5 GHz LTE TDD band in small-cell remote radio head. IC Role / Device Role / Timing Role: High-linearity upconverter with low-side LO injection and differential IF interface. Use Value: Adjustable G_BIAS allows trade-off between EVM and output power; DC–500 MHz IF supports flexible digital predistortion loop placement. |
| WiMAX Base Station Transceiver | OFDM Signal Analyzer Front-End |
Use Scenario: Dual-mode WiMAX (2.3/2.5 GHz) transceiver using HMC686LP4E in receive path with 1.1 GHz LO. IC Role / Device Role / Timing Role: High-isolation mixer providing LO-to-RF suppression (>26 dB) and RF-to-IF isolation (>27 dB). Use Value: LO–RF isolation reduces need for external LO filtering; 500 MHz IF bandwidth captures full 20 MHz WiMAX channel plus guard bands. | Use Scenario: Wideband spectrum analyzer front-end capturing multi-carrier OFDM signals from 0.7–1.1 GHz. IC Role / Device Role / Timing Role: Passive mixer core with integrated LO buffer enabling calibrated, repeatable amplitude response across band. Use Value: Stable conversion loss (±0.5 dB over band) and flat IF response (DC–500 MHz) ensure measurement accuracy without post-processing correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC684LP4E | 0.7–1.0 GHz RF band optimized for low-side LO; no high-side LO support; identical pinout and package. | Best suited for legacy GSM downconverters requiring low-side LO architecture below 1 GHz. | Select when LO frequency planning mandates low-side injection and RF band is strictly ≤1.0 GHz. |
| ADL5802ACPZ-R7 | Wider RF range (9 MHz–6 GHz); higher conversion loss (8.5 dB typ); no integrated LO amplifier - requires external LO driver. | Used in broadband test equipment and software-defined radios where frequency agility outweighs power efficiency. | Choose for multi-band lab instruments needing single-part coverage beyond 1.5 GHz, accepting higher loss and added LO driver complexity. |
Compared with HMC686LP4E, HMC684LP4E offers identical form-factor and bias compatibility but lacks 1.4–1.5 GHz LTE band support, while ADL5802ACPZ-R7 provides broader frequency coverage at the cost of higher conversion loss and external LO drive requirement - making HMC686LP4E optimal for power- and linearity-critical 700–1500 MHz infrastructure applications.
Availability
HMC686LP4E is available at Aetrix Electronics and suitable for cellular base stations, LTE repeaters, and WiMAX transceivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for HMC686LP4E 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 continues to manufacture and support its high-performance RF IC portfolio, including mixers, amplifiers, and synthesizers for communications infrastructure.
The HMC686LP4E belongs to Hittite's high-linearity BiCMOS mixer product line, engineered specifically for demanding wireless infrastructure applications where IP3, conversion loss, and integration level directly impact base station sensitivity and spectral efficiency.
FAQ
What is the recommended LO drive level for optimal performance of the HMC686LP4E?
The HMC686LP4E is characterized for optimal linearity and conversion loss at +0 dBm LO drive. It accepts LO input from –3 dBm to +3 dBm, with IP3 peaking near 0 dBm and conversion gain varying by <0.5 dB across this range. Driving outside ±3 dBm risks compression or degraded noise figure. The integrated LO amplifier eliminates need for external driver stages when using 0 dBm source.
Does the HMC686LP4E support both upconversion and downconversion?
Yes, the HMC686LP4E supports both upconversion and downconversion. In downconversion mode, it operates with high-side LO (0.7–1.1 GHz RF) or low-side LO (1.4–1.5 GHz RF). For upconversion, evaluation data confirms functional operation with IF input and RF output - e.g., 120 MHz IF to 0.9 GHz RF - maintaining +34 dBm IP3 and 7.5 dB conversion loss under specified bias conditions.
How does G_BIAS adjustment affect the performance of the HMC686LP4E?
G_BIAS adjustment directly trades conversion loss against linearity: at 3.5 V, HMC686LP4E achieves 7.5 dB conversion loss and +34 dBm IP3; lowering G_BIAS to 2.5 V increases conversion loss to ~8.5 dB but improves P1dB by ~1 dB and reduces Icc by ~25 mA. This enables dynamic power–performance scaling in adaptive radio systems without hardware modification.
Is the HMC686LP4E pin-compatible with other devices in the HMC68xLP4 family?
Yes, the HMC686LP4E is pin-for-pin compatible with the HMC684LP4E, differing only in internal optimization (HMC684LP4E targets 0.7–1.0 GHz low-side LO; HMC686LP4E targets 0.7–1.1 GHz high-side LO and 1.4–1.5 GHz low-side LO). Both share identical 24-lead 4×4 mm QFN package, pin functions, and biasing scheme - enabling drop-in replacement in existing layouts when band or LO architecture changes.
What is the maximum RF input power the HMC686LP4E can handle without damage?
The absolute maximum RF/IF input power rating for the HMC686LP4E is +23 dBm (200 mW) at Vcc = +5 V. However, for linear operation, the input 1 dB compression point is +25 dBm - meaning the device begins compressing at +25 dBm input. Sustained operation above +23 dBm risks permanent damage; system design must include limiting or attenuation ahead of the HMC686LP4E if transient peaks exceed this level.
HMC686LP4E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Obsolete
- RF Type:
- LTE, WiMax
- Frequency:
- 700MHz ~ 1.5GHz
- Number of Mixers:
- 1
- Gain:
- -
- Noise Figure:
- 7.5dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 105mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
HMC686LP4E FAQ
1.How can I place an order for HMC686LP4E through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC686LP4E 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 HMC686LP4E reliable?
The price and inventory of HMC686LP4E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC686LP4E is usually 5 days.
3.What payment methods are accepted for HMC686LP4E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC686LP4E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC686LP4E?
HMC686LP4E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC686LP4E 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 HMC686LP4E?
For technical support, including HMC686LP4E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC686LP4E requirements.
6.How does Aetrix verify that HMC686LP4E is sourced from the original manufacturer or authorized distributors?
All HMC686LP4E 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 HMC686LP4E meets industry standards.
7.What is the process for return or replacement of HMC686LP4E?
All HMC686LP4E units undergo pre-shipment inspection (PSI). If there is an issue with HMC686LP4E, 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 HMC686LP4E part is unused and in its original packaging.
Return procedure for HMC686LP4E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC686LP4E Tags
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MAX2671EUT+T
Analog Devices Inc./Maxim Integrated
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ADEX-10+
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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
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ADE-1ASK+
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ADE-1L+
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AD608ARZ-RL
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