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Analog Devices Inc. HMC687LP4ETR
- Part No.:
- HMC687LP4ETR
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
HMC687LP4ETR.pdf
- Description:
- IC MMIC MIXER BICMOS 24-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
HMC687LP4ETR from Analog Devices (formerly Hittite Microwave) is a BiCMOS MMIC double-balanced mixer with integrated LO amplifier, designed for RF-to-IF downconversion and upconversion in 1.7–2.2 GHz systems. It delivers 8 dB typical conversion loss, +35 dBm input IP3, +23 dBm input P1dB, and operates from DC to 500 MHz IF bandwidth at +5 V supply. It serves as the core signal translation element in cellular base station transceivers.
For engineers reviewing the HMC687LP4ETR datasheet, HMC687LP4ETR pinout, HMC687LP4ETR application, or HMC687LP4ETR equivalent, key selection criteria include high-side LO optimization, adjustable G_BIAS for linearity vs. loss trade-off, differential IF interface, and 24-pin 4×4 mm QFN package compatibility with RF layout best practices.
Technical Context
The HMC687LP4ETR implements a passive double-balanced mixer core with an on-die LO buffer amplifier, enabling operation with low LO drive (−3 to +3 dBm). Its internal RF and LO baluns provide single-ended 50 Ω ports while maintaining high isolation: ≥32 dB LO-to-RF and ≥42 dB RF-to-IF.
It supports both upconversion and downconversion modes, optimized for high-side LO injection. Bias control via G_BIAS (0–5 V) and LO_BIAS (via external R9) allows dynamic adjustment of conversion loss, noise figure, and IP3 across temperature and supply conditions without changing hardware layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 1.7–2.2 GHz - Covers full LTE Band 1/3/7/38/40 and WCDMA UMTS bands. |
| LO Frequency Range | 1.7–2.4 GHz - Enables high-side LO injection for 1.7–2.2 GHz RF with IF = RF − LO. |
| IF Bandwidth | DC–500 MHz - Supports baseband I/Q, zero-IF, and low-IF architectures up to 500 MHz. |
| Conversion Loss | 8 dB typical - Low loss preserves SNR in receiver front-ends and reduces transmit chain gain requirements. |
| Input IP3 | +35 dBm typical - Enables handling of strong adjacent-channel interferers in dense cellular environments. |
| Input P1dB | +23 dBm typical - Accommodates wide dynamic range signals without compression in basestation receivers. |
| LO–RF Isolation | ≥32 dB - Minimizes LO leakage into antenna path, easing filter requirements and improving spectral purity. |
| Supply Current | 120 mA @ +5 V - Configurable via G_BIAS and R9 to reduce power in lower-performance modes. |
Pinout & Package
Package: 24-lead 4×4 mm QFN with exposed thermal paddle; RoHS-compliant matte tin plating; MSL1 rating; max reflow 260 °C.
| 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/LNA path. |
| 16 (LO) | Single-ended LO port | 50 Ω matched, DC-short via internal balun; accepts −3 to +3 dBm drive without external amplification. |
| 21, 22 (IFP, IFN) | Differential IF interface | 50 Ω differential; supports DC-coupled I/Q demodulation or AC-coupled IF output with external blocking caps. |
| 8, 10, 24 (Vcc1, Vcc2, Vcc3) | Power supply inputs | Three independent +5 V rails; decoupling required per application circuit to suppress supply noise coupling. |
| 9 (LO_BIAS) | LO buffer current control | External resistor (e.g., 270 Ω) sets LO driver bias current, trading power vs. LO linearity and isolation. |
| 19 (G_BIAS) | Mixer core bias control | 0–5 V analog input adjusts conversion loss and IP3; +2.5 V nominal for balanced performance at +5 V supply. |
| 2, 5, 15, 17 (GND) | Ground terminals | Must be soldered to PCB RF ground plane; critical for balun return path and thermal dissipation. |
| 1, 6, 7, 11–14, 18, 20, 23 (N/C) | No-connect pins | May be grounded for mechanical stability; no electrical function or performance impact. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO amplifier | Eliminates need for external LO buffer, reducing BOM count and board area in compact RF modules. |
| Adjustable G_BIAS and LO_BIAS | Enables real-time optimization of conversion loss, IP3, and supply current without hardware change. |
| High LO–RF and RF–IF isolation | ≥32 dB LO–RF and ≥42 dB RF–IF reduce spurious mixing and simplify filtering in full-duplex systems. |
| DC–500 MHz IF bandwidth | Supports zero-IF, complex I/Q, and wideband IF sampling architectures used in software-defined radios. |
| 24-pin 4×4 mm QFN package | Small footprint with exposed paddle enables high-density RF layout and efficient thermal management. |
| High-side LO optimization | Designed for RF = LO + IF configuration, simplifying frequency planning in FDD LTE and WCDMA basestations. |
Applications
| Cellular Basestation Receiver | LTE/WiMAX Transmitter |
|---|---|
Use Scenario: Downconverting 1.8–2.2 GHz LTE FDD receive signals to 10–200 MHz IF in macrocell basestation. IC Role / Device Role / Timing Role: Core double-balanced mixer performing RF-to-IF translation with integrated LO amplification. Use Value: +35 dBm IP3 and +23 dBm P1dB enable robust reception in interference-rich urban deployments without front-end attenuation. | Use Scenario: Upconverting 10–200 MHz baseband I/Q signals to 1.7–2.2 GHz for LTE/WiMAX transmission. IC Role / Device Role / Timing Role: High-linearity active mixer translating IF to RF with precise phase coherence. Use Value: 8 dB conversion loss minimizes DAC and driver stage gain requirements, lowering overall transmit chain noise and power. |
| GSM/CDMA Repeaters | OFDM Test Equipment Front-End |
Use Scenario: Bidirectional signal translation in in-building repeaters covering 1.7–2.2 GHz GSM/CDMA bands. IC Role / Device Role / Timing Role: Dual-mode mixer supporting simultaneous up/down conversion with shared LO path. Use Value: Pin-compatible with HMC685LP4E allows dual-band repeater designs using one PCB layout for high/low-side LO variants. | Use Scenario: Signal conditioning in vector signal analyzers and arbitrary waveform generators operating up to 2.2 GHz. IC Role / Device Role / Timing Role: Precision mixer for calibration, stimulus generation, and harmonic analysis. Use Value: DC–500 MHz IF bandwidth supports wide instantaneous bandwidth capture and synthesis for OFDM symbol analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC685LP4ETR | Same 4×4 mm QFN package and pinout; optimized for low-side LO (RF = LO − IF) instead of high-side. | Suitable for systems requiring LO < RF (e.g., certain TDD-LTE or ISM band configurations). | Select when frequency plan mandates LO below RF; otherwise HMC687LP4ETR preferred for FDD LTE. |
| ADL5802ACPZ-R7 | Active double-balanced mixer; 0.4–2.7 GHz RF, +22 dBm P1dB, +30 dBm IP3; requires external LO buffer. | Broadband alternative with wider RF range but lower linearity and higher supply current (190 mA). | Choose for multi-band systems spanning sub-1 GHz to 2.7 GHz where HMC687LP4ETR's narrowband optimization is unnecessary. |
Compared with HMC687LP4ETR, HMC685LP4ETR offers identical form-factor and bias architecture but inverted LO-side optimization, while ADL5802ACPZ-R7 trades bandwidth and integration for reduced linearity and higher power-making HMC687LP4ETR optimal for high-dynamic-range 1.7–2.2 GHz FDD infrastructure.
Availability
HMC687LP4ETR is available at Aetrix Electronics and suitable for cellular basestation receivers, LTE/WiMAX transmitters, and GSM/CDMA repeaters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for HMC687LP4ETR 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 HMC687LP4ETR belongs to Hittite's BiCMOS MMIC mixer family, engineered specifically for high-linearity, low-loss signal translation in 3G/4G wireless infrastructure equipment.
FAQ
What is the recommended LO drive level for optimal performance of the HMC687LP4ETR?
The HMC687LP4ETR achieves best-in-class linearity and conversion loss at 0 dBm LO drive, with specified operation from −3 to +3 dBm. At 0 dBm, it delivers 8 dB typical conversion loss and +35 dBm input IP3. Lower LO drive increases conversion loss; higher drive risks saturation of the internal LO amplifier and degrades isolation. The LO port is 50 Ω matched and DC-short, requiring no external matching network.
Can the HMC687LP4ETR be used for both upconversion and downconversion?
Yes, the HMC687LP4ETR supports bidirectional operation: as a downconverter (RF → IF) with high-side LO injection (RF = LO − IF), and as an upconverter (IF → RF) with the same LO configuration. Its symmetric double-balanced architecture and broadband IF response (DC–500 MHz) make it suitable for zero-IF transceivers and wideband modulators/demodulators in LTE and WiMAX systems.
How does G_BIAS voltage affect the performance of the HMC687LP4ETR?
G_BIAS (pin 19) controls the bias point of the mixer core: increasing G_BIAS from 1 V to 3.5 V reduces conversion loss by ~1.5 dB but lowers input IP3 by ~4 dBm. At nominal +2.5 V (with +5 V supply), HMC687LP4ETR balances 8 dB loss and +35 dBm IP3. This analog adjustment enables system-level trade-offs between sensitivity and linearity without hardware changes.
What is the thermal design requirement for reliable operation of the HMC687LP4ETR?
The HMC687LP4ETR has a channel-to-ground thermal resistance of 48.33 °C/W and maximum channel temperature of 125 °C. To maintain safe operation at full 120 mA supply current, the PCB must provide low-impedance thermal conduction from the exposed paddle to a solid ground plane with ≥6 thermal vias (0.3 mm diameter). Operating ambient must stay ≤+85 °C, and derating is required above 85 °C (20.69 mW/°C).
Is the HMC687LP4ETR pin-compatible with any other Hittite/Analog Devices mixers?
Yes, the HMC687LP4ETR is pin-for-pin compatible with the HMC685LP4ETR, which shares the same 24-pin 4×4 mm QFN package and pin assignments. The key difference is LO-side optimization: HMC687LP4ETR targets high-side LO (RF = LO + IF), while HMC685LP4ETR targets low-side LO (RF = LO − IF). This allows reuse of PCB layouts across dual-configuration basestation designs.
HMC687LP4ETR 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:
- 1.7GHz ~ 2.2GHz
- Number of Mixers:
- 1
- Gain:
- -
- Noise Figure:
- 8dB
- Secondary Attributes:
- -
- Current - Supply:
- 120mA
- Voltage - Supply:
- 5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
HMC687LP4ETR FAQ
1.How can I place an order for HMC687LP4ETR through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC687LP4ETR 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 HMC687LP4ETR reliable?
The price and inventory of HMC687LP4ETR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC687LP4ETR is usually 5 days.
3.What payment methods are accepted for HMC687LP4ETR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC687LP4ETR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC687LP4ETR?
HMC687LP4ETR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC687LP4ETR 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 HMC687LP4ETR?
For technical support, including HMC687LP4ETR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC687LP4ETR requirements.
6.How does Aetrix verify that HMC687LP4ETR is sourced from the original manufacturer or authorized distributors?
All HMC687LP4ETR 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 HMC687LP4ETR meets industry standards.
7.What is the process for return or replacement of HMC687LP4ETR?
All HMC687LP4ETR units undergo pre-shipment inspection (PSI). If there is an issue with HMC687LP4ETR, 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 HMC687LP4ETR part is unused and in its original packaging.
Return procedure for HMC687LP4ETR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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