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Analog Devices Inc. HMC686LP4ETR
- Part No.:
- HMC686LP4ETR
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
HMC686LP4ETR.pdf
- Description:
- IC MMIC MIXER BICMOS 24-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,478
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Product details
Overview
HMC686LP4ETR from Analog Devices (formerly Hittite Microwave) is a high-dynamic-range BiCMOS passive MMIC mixer with integrated LO amplifier, designed for RF-to-IF downconversion and upconversion in cellular infrastructure. It delivers +34 dBm input IP3, 7.5 dB typical conversion loss, and DC–500 MHz IF bandwidth, operating across 0.7–1.1 GHz (high-side LO) and 1.4–1.5 GHz (low-side LO) RF bands with 5 V supply.
For engineers reviewing the HMC686LP4ETR datasheet, HMC686LP4ETR pinout, HMC686LP4ETR application, or HMC686LP4ETR equivalent, this device supports critical LTE/WiMAX base station receiver/transmitter signal chains requiring high linearity, wide IF bandwidth, and adjustable bias for trade-offs between gain, noise, and power consumption.
Technical Context
The HMC686LP4ETR integrates a broadband LO amplifier driving a passive double-balanced mixer core, enabling high-side LO injection for 0.7–1.1 GHz RF band operation and low-side LO injection for 1.4–1.5 GHz LTE band operation. Its differential IF interface (IFP/IFN) supports DC-coupled or AC-coupled configurations, while internal baluns provide 50 Ω single-ended matching at RF and LO ports.
Supply current is actively adjustable via G_BIAS (0–5 V) and LO_BIAS (external R9), allowing optimization of Icc (60–120 mA) versus IP3 (+31.5 to +34 dBm), conversion gain (−12 to −6 dB), and P1dB (+23.5 to +25 dBm). Thermal resistance is 52 °C/W, rated for −40 to +85 °C operation.
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 LTE/GSM infrastructure reuse. |
| IF Bandwidth | DC to 500 MHz; supports full GSM/CDMA transmit/receive channel plans without external IF filtering. |
| Conversion Loss | 7.5 dB typical @ 0 dBm LO; defines minimum required LNA gain before mixer in receiver chain. |
| Input IP3 | +34 dBm typical @ 0.7–1.1 GHz; ensures robust handling of strong adjacent-channel interferers in base stations. |
| LO to RF Isolation | 26 dB typical; reduces LO leakage into antenna path, easing front-end filter requirements. |
| Supply Current | 60–120 mA (adjustable via G_BIAS & LO_BIAS); allows power/linearity trade-off in thermally constrained designs. |
| Package | 24-lead 4×4 mm QFN with exposed thermal paddle; requires soldered ground paddle for thermal and RF performance. |
Pinout & Package
24-lead 4×4 mm QFN package (MSL1, RoHS-compliant, matte Sn finish) with exposed thermal paddle requiring connection to PCB RF ground. Pin 1 marked by dot; pins 1,6,7,11–14,18,20,23 are no-connect but may be grounded without performance impact.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 3 (RF) | Single-ended RF port | 50 Ω matched, DC-short via internal balun; connects directly to antenna or PA output without external matching. |
| 16 (LO) | Single-ended LO port | 50 Ω matched, DC-short via internal balun; accepts −3 to +3 dBm drive; integrated LO amp eliminates external driver. |
| 21,22 (IFN, IFP) | Differential IF interface | Matched to differential 50 Ω; supports DC-coupled baseband or AC-coupled IF stages; requires external blocking caps if DC not needed. |
| 9 (LO_BIAS) | LO amplifier bias control | Adjusts LO buffer current via external R9 (330 Ω nominal); sets LO drive level and power dissipation. |
| 19 (G_BIAS) | Mixer core gate bias | 0–5 V adjustable bias; tunes conversion loss vs. IP3 trade-off (e.g., +3.5 V = nominal 5 V operation). |
| 8,10,24 (Vcc1,Vcc2,Vcc3) | Power supply inputs | Three independent 5 V supplies; decoupling required per application circuit to suppress supply noise coupling into IF. |
| 2,5,15,17 (GND) | Ground terminals | Must connect to RF/DC ground plane; package bottom paddle must be soldered to PCB ground for thermal and isolation performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO amplifier | Eliminates need for external LO driver stage, reducing BOM count and layout area in compact RF modules. |
| Adjustable G_BIAS and LO_BIAS | Enables real-time optimization of linearity (IP3), conversion loss, and supply current for specific system requirements. |
| DC–500 MHz IF bandwidth | Supports zero-IF and low-IF architectures for GSM, CDMA, OFDM, and LTE without IF filtering bottlenecks. |
| High-side and low-side LO support | Single device covers both 0.7–1.1 GHz (high-side) and 1.4–1.5 GHz (low-side) RF bands-reducing inventory SKUs. |
| 24-lead 4×4 mm QFN with thermal paddle | Enables high-power RF operation (0.76 W max dissipation) with low thermal resistance (52 °C/W) in space-constrained layouts. |
Applications
| Cellular Base Station Receiver | LTE Band 3/7 Transmitter |
|---|---|
|
Use Scenario: Downconverting 1.8 GHz LTE signals to 140 MHz IF in macro base station receive chain. IC Role / Device Role / Timing Role: Passive double-balanced mixer with integrated LO amplifier performing RF-to-IF translation. Use Value: +34 dBm IP3 prevents desensitization from strong out-of-band interferers; 1.4–1.5 GHz low-side LO mode enables clean IF placement. |
Use Scenario: Upconverting 140 MHz IF to 1.8 GHz LTE Tx band in remote radio head transmitter. IC Role / Device Role / Timing Role: Active upconverter using differential IF input and single-ended RF output. Use Value: DC–500 MHz IF bandwidth accommodates wide digital IF signals; adjustable G_BIAS optimizes EVM under varying PA backoff. |
| GSM/CDMA Repeaters | WiMAX CPE Front-End |
|
Use Scenario: Bidirectional signal translation in in-building repeater systems covering 0.8–0.9 GHz GSM bands. IC Role / Device Role / Timing Role: High-isolation mixer enabling simultaneous Rx/Tx on shared antenna via duplexer. Use Value: 26 dB LO-to-RF isolation minimizes self-interference; 27 dB RF-to-IF isolation preserves signal integrity in feedback paths. |
Use Scenario: IF processing in 2.5 GHz WiMAX customer premise equipment with DC-coupled baseband interface. IC Role / Device Role / Timing Role: Zero-IF mixer converting baseband I/Q to RF with integrated LO amplification. Use Value: DC-coupled IFP/IFN pins eliminate external DC-blocking capacitors, reducing component count and phase mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC684LP4ETR | Optimized for 0.7–1.0 GHz RF band with low-side LO only; lacks 1.4–1.5 GHz LTE band support. | Not suitable for LTE Band 3/7 upconversion; limited to legacy GSM/CDMA repeaters and base stations. | Select when only 0.7–1.0 GHz low-side LO operation is required and cost sensitivity outweighs dual-band flexibility. |
| ADL5801ACPZ-R7 | Active mixer with 300 MHz–3.8 GHz RF range; higher conversion gain (+10 dB) but lower IP3 (+22 dBm) and no integrated LO amp. | Requires external LO driver; better suited for wideband test equipment than high-linearity cellular infrastructure. | Select for wide RF coverage and gain-critical applications where LO driver integration is handled externally. |
Compared with HMC686LP4ETR, HMC684LP4ETR offers pin compatibility but sacrifices LTE band support, while ADL5801ACPZ-R7 trades linearity and LO integration for broader frequency coverage and active gain-making HMC686LP4ETR optimal for thermally constrained, high-IP3 cellular infrastructure designs.
Availability
HMC686LP4ETR is available at Aetrix Electronics and suitable for cellular base stations, LTE repeaters, and WiMAX CPE requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for HMC686LP4ETR 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 portfolio for communications infrastructure.
The HMC686LP4ETR belongs to Hittite's high-linearity passive mixer family, engineered specifically for 3G/4G/LTE base station and repeater applications demanding wide IF bandwidth and integrated LO drive.
FAQ
What RF frequency bands does the HMC686LP4ETR support?
The HMC686LP4ETR supports two distinct RF bands: 0.7–1.1 GHz with high-side LO injection and 1.4–1.5 GHz with low-side LO injection. These bands align precisely with GSM/CDMA and LTE Band 3/7 infrastructure requirements. The device is not specified for continuous operation across 0.7–1.5 GHz; performance varies by band and LO configuration as documented in the datasheet.
Does the HMC686LP4ETR require an external LO driver?
No, the HMC686LP4ETR integrates a dedicated LO amplifier and operates with −3 to +3 dBm LO drive level. This eliminates the need for an external LO driver stage, simplifying RF front-end design and reducing board space and power consumption compared to discrete mixer solutions.
How is supply current adjusted on the HMC686LP4ETR?
Supply current is adjusted via two independent controls: G_BIAS pin (0–5 V) sets mixer core bias for IP3/conversion loss trade-off, and LO_BIAS pin (via external R9 resistor) adjusts LO amplifier current. At nominal 5 V supply, 330 Ω on LO_BIAS yields ~105 mA total Icc; reducing R9 lowers current and linearity.
What is the function of the TAP pin (Pin 4) on the HMC686LP4ETR?
Pin 4 (TAP) is the center tap of the internal RF balun's secondary winding. It must be shorted to RF ground with a zero-ohm resistor placed as close as possible to the package. This connection stabilizes balun common-mode impedance and ensures optimal RF port match and isolation performance.
Can the HMC686LP4ETR be used in zero-IF receiver architectures?
Yes-the HMC686LP4ETR supports DC-coupled differential IF operation via IFP/IFN pins, making it suitable for zero-IF receivers. No external DC-blocking capacitors are required unless DC offset rejection is needed; the device maintains balanced performance down to 0 Hz IF frequency.
HMC686LP4ETR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
HMC686LP4ETR FAQ
1.How can I place an order for HMC686LP4ETR through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC686LP4ETR 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 HMC686LP4ETR reliable?
The price and inventory of HMC686LP4ETR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC686LP4ETR is usually 5 days.
3.What payment methods are accepted for HMC686LP4ETR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC686LP4ETR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC686LP4ETR?
HMC686LP4ETR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC686LP4ETR 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 HMC686LP4ETR?
For technical support, including HMC686LP4ETR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC686LP4ETR requirements.
6.How does Aetrix verify that HMC686LP4ETR is sourced from the original manufacturer or authorized distributors?
All HMC686LP4ETR 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 HMC686LP4ETR meets industry standards.
7.What is the process for return or replacement of HMC686LP4ETR?
All HMC686LP4ETR units undergo pre-shipment inspection (PSI). If there is an issue with HMC686LP4ETR, 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 HMC686LP4ETR part is unused and in its original packaging.
Return procedure for HMC686LP4ETR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC686LP4ETR Tags
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