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Analog Devices Inc. HMC621LP4ETR
- Part No.:
- HMC621LP4ETR
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
HMC621LP4ETR.pdf
- Description:
- IC RFIC DOWNCONVERTER 24-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
HMC621LP4ETR from Analog Devices (formerly Hittite Microwave) is a highly integrated RFIC downconverter IC for cellular/3G/LTE/WiMAX/4G infrastructure transceivers, operating from 0.9–1.6 GHz RF with 50–500 MHz IF output, +33 dBm OIP3, 4.5 dB noise figure, and 30 dB conversion gain at 0 dBm LO drive.
For engineers reviewing the HMC621LP4ETR datasheet, HMC621LP4ETR pinout, HMC621LP4ETR application, or HMC621LP4ETR equivalent, this device supports compact SMT-based receiver front-ends requiring high linearity, low-noise downconversion, and minimal external biasing in BTS, repeaters, femtocells, and public safety radios.
Technical Context
The HMC621LP4ETR integrates a single-balanced mixer core with on-die RF, LO, and IF amplifiers - enabling full downconversion functionality without discrete gain stages. It operates with low-side or high-side LO injection and supports DC-coupled IF output up to 40 mA sink/source capability.
Its architecture delivers 45 dB LO-to-RF isolation and maintains stable performance across –40°C to +85°C, with thermal resistance of 47.9°C/W and junction temperature rating up to 150°C. Bias is set via external resistor R1 on RES pin to control RF amplifier current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 0.9–1.6 GHz - covers primary LTE Band 5/8/20/28 and WiMAX 2.3/2.5 GHz front-end downconversion when used with appropriate LO synthesis |
| LO Frequency Range | 0.85–1.1 GHz - enables low-side LO injection for 0.9–1.6 GHz RF input with 200 MHz IF |
| IF Frequency Range | 50–500 MHz - supports baseband and intermediate frequency processing in multi-standard receivers |
| Conversion Gain | 30 dB typical - eliminates need for external IF amplification in many compact transceiver designs |
| Noise Figure (SSB) | 4.5 dB - ensures high sensitivity in weak-signal reception scenarios such as femtocell uplink paths |
| OIP3 | +33 dBm - provides robust interference rejection in dense spectral environments like urban macrocells |
| LO Drive Level | 0 dBm - reduces LO synthesizer output power requirement and simplifies local oscillator design |
| Supply Current | 250 mA at +5 V - defines PCB power delivery and thermal management requirements for continuous operation |
Pinout & Package
Package: 24-lead 4×4 mm QFN with exposed ground paddle (RoHS-compliant matte Sn finish, MSL1, max reflow 260°C). Requires soldering of all ground leads and paddle to PCB RF ground plane per Hittite land pattern guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VddRF) | RF amplifier supply rail | Must be decoupled with choke inductor and bypass capacitors; sets RF amp bias point |
| 2 (RES) | RF amplifier current control | External resistor (e.g., 3.92 kΩ) sets IddRF; enables optimization of gain/noise trade-off |
| 3 (RFIN) | 50 Ω-matched RF input | Direct connection to antenna or LNA output; no external matching required |
| 4,6–8,10,11,13,16,18–20,23,24 (N/C) | No-connect terminals | May be tied to ground for mechanical stability but carry no electrical function |
| 5 (GND) | Ground reference | Backside exposed paddle must be soldered to PCB ground plane for thermal and RF performance |
| 9 (LOIN) | 50 Ω-matched LO input | AC-coupled; accepts 0 dBm drive level directly from LO synthesizer or buffer |
| 12 (VddLO) | LO amplifier supply | Requires external RF bypass capacitor; powers internal LO buffer stage |
| 14 (MIXIF) | Mixer IF output node | DC-coupled; supports operation to DC if current ≤40 mA; otherwise requires external blocking cap |
| 15 (IFIN) | IF amplifier input | DC-coupled; requires off-chip DC blocking capacitor for AC-coupled IF chain interfaces |
| 17 (IFOUT) | IF amplifier output & bias rail | Provides amplified IF signal and supplies Vcc to output stage; may require series DC block |
| 21 (MIXRF) | Mixer RF output node | DC-coupled; connects internally to RF amplifier output and mixer input |
| 22 (RFOUT) | 50 Ω-matched RF output | Used only in upconversion mode; not active in standard downconverter configuration |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RF/LO/IF amplifiers | Reduces bill-of-materials by eliminating three discrete gain stages while maintaining 30 dB system gain |
| +33 dBm output IP3 | Enables coexistence in spectrally crowded bands without external filtering or attenuation |
| 4.5 dB noise figure | Preserves receiver sensitivity in low-SNR environments such as indoor femtocell deployments |
| 0 dBm LO drive requirement | Lowers LO synthesizer power consumption and simplifies clock tree design in multi-channel systems |
| 45 dB LO-to-RF isolation | Minimizes LO leakage into antenna path, easing compliance with radiated emission standards |
| DC-coupled IF interface | Supports zero-IF and low-IF architectures without mandatory AC coupling, reducing component count |
Applications
| Cellular Base Transceiver Station (BTS) | Small Cell Femtocell |
|---|---|
Use Scenario: Downconverting 1.8 GHz LTE uplink signals to 200 MHz IF in macrocell remote radio heads. IC Role / Device Role / Timing Role: Primary RFIC downconverter providing gain, filtering, and linearity in receive signal chain. Use Value: 30 dB conversion gain and +33 dBm OIP3 enable direct digitization after one IF stage, reducing ADC dynamic range requirements. |
Use Scenario: Compact indoor residential femtocell supporting simultaneous 3G/LTE bands with minimal footprint. IC Role / Device Role / Timing Role: Integrated downconverter handling dual-band RF-to-IF translation with shared LO resources. Use Value: Low 4.5 dB noise figure and 0 dBm LO drive simplify RF front-end design and lower overall system power budget. |
| Public Safety Radio Receiver | WiMAX Access Point |
Use Scenario: Wideband receiver for T-Band (470–512 MHz) and 700 MHz FirstNet spectrum in portable base stations. IC Role / Device Role / Timing Role: High-isolation downconverter minimizing LO feedthrough in battery-powered field units. Use Value: 45 dB LO-to-RF isolation meets stringent spurious emission limits without additional shielding or filtering. |
Use Scenario: Fixed wireless access point operating in 2.3–2.7 GHz WiMAX band with 50 MHz channel bandwidth. IC Role / Device Role / Timing Role: IF-stage downconverter delivering flat 50–500 MHz response for flexible channel selection. Use Value: Broad IF bandwidth supports reconfigurable digital IF processing across multiple modulation schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF downconverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC1040LP4E | Wider RF range (0.7–2.7 GHz), higher OIP3 (+35 dBm), but requires +7 dBm LO drive | Better suited for wideband military/comms where LO power is available; less optimal for low-power LTE small cells | Select HMC1040LP4E only when broader RF coverage and higher linearity outweigh LO drive penalty |
| ADL5360ACPZ-R7 | Lower noise figure (3.8 dB), narrower RF range (800–1000 MHz), no integrated LO amplifier | Preferred for ultra-low-noise narrowband receivers (e.g., GPS-assisted timing); lacks LO buffering for simplified LO routing | Choose ADL5360ACPZ-R7 when NF < 4 dB is critical and LO source can deliver > +13 dBm |
Compared with HMC621LP4ETR, HMC1040LP4E trades higher LO drive for extended bandwidth and improved linearity, while ADL5360ACPZ-R7 offers superior noise performance at the cost of integration and frequency agility - making HMC621LP4ETR the balanced choice for cost-sensitive, space-constrained LTE/WiMAX infrastructure.
Availability
HMC621LP4ETR is available at Aetrix Electronics and suitable for cellular infrastructure, small cell femtocells, and public safety radio systems requiring stable component supply, RoHS-compliant packaging, and proven RFIC downconversion performance.
Supply support for HMC621LP4ETR 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 its legacy of high-performance RF, microwave, and millimeter-wave ICs for communications, defense, and instrumentation markets.
The HMC621LP4ETR belongs to Hittite's legacy RFIC downconverter product line, designed specifically for compact, high-linearity receiver front-ends in 3G/LTE/WiMAX base station and small cell infrastructure.
FAQ
What is the recommended LO drive level for optimal performance of the HMC621LP4ETR?
The HMC621LP4ETR achieves its specified 30 dB conversion gain and +33 dBm OIP3 at a nominal LO drive level of 0 dBm. Performance remains stable within –3 to +3 dBm; exceeding +3 dBm risks compression or reliability degradation. The integrated LO amplifier eliminates need for external LO buffering, simplifying system-level LO distribution.
Can the HMC621LP4ETR operate with high-side LO injection?
Yes, the HMC621LP4ETR supports both low-side and high-side LO injection configurations as confirmed in the cascade analysis section of its datasheet. For high-side LO, the LO frequency must fall within 0.85–1.1 GHz to maintain proper mixing with 0.9–1.6 GHz RF input and produce valid IF outputs between 50–500 MHz.
Is the IF output of the HMC621LP4ETR DC-coupled, and what are the current limitations?
Yes, the IF output (pin 14, MIXIF) is DC-coupled and capable of sinking or sourcing up to 40 mA. Exceeding this limit may cause device failure. For AC-coupled IF chains, an external series capacitor must be added; value selection depends on lowest IF frequency of interest (e.g., 10 nF for 50 MHz cutoff).
What is the thermal resistance and maximum junction temperature specification for the HMC621LP4ETR?
The HMC621LP4ETR has a junction-to-ground-paddle thermal resistance of 47.9°C/W and a maximum junction temperature rating of 150°C. Continuous power dissipation at +85°C ambient is 1.36 W, derating linearly at 20.8 mW/°C above that temperature. Proper PCB grounding of the exposed paddle is essential to meet thermal specs.
Does the HMC621LP4ETR require external bias resistors, and how is RF amplifier current set?
Yes, the HMC621LP4ETR uses pin 2 (RES) to set the DC current of the internal RF amplifier via an external bias resistor. At +5 V bias, a 3.92 kΩ resistor yields 88 mA RF amplifier current, optimizing gain and noise figure. Resistor values from 65 Ω to 10 kΩ are supported, allowing trade-offs between current consumption and performance.
HMC621LP4ETR 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:
- 900MHz ~ 1.6GHz
- Number of Mixers:
- 1
- Gain:
- 27dB
- Noise Figure:
- 4.5dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 250mA
- Voltage - Supply:
- 5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
HMC621LP4ETR FAQ
1.How can I place an order for HMC621LP4ETR through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC621LP4ETR 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 HMC621LP4ETR reliable?
The price and inventory of HMC621LP4ETR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC621LP4ETR is usually 5 days.
3.What payment methods are accepted for HMC621LP4ETR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC621LP4ETR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC621LP4ETR?
HMC621LP4ETR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC621LP4ETR 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 HMC621LP4ETR?
For technical support, including HMC621LP4ETR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC621LP4ETR requirements.
6.How does Aetrix verify that HMC621LP4ETR is sourced from the original manufacturer or authorized distributors?
All HMC621LP4ETR 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 HMC621LP4ETR meets industry standards.
7.What is the process for return or replacement of HMC621LP4ETR?
All HMC621LP4ETR units undergo pre-shipment inspection (PSI). If there is an issue with HMC621LP4ETR, 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 HMC621LP4ETR part is unused and in its original packaging.
Return procedure for HMC621LP4ETR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC621LP4ETR Tags
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MAX2671EUT+T
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ADEX-10+
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ADE-2+
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ADE-1+
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LT5560EDD#TRPBF
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MAX2681EUT+T
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ADE-1ASK+
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ADE-1L+
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