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Analog Devices Inc. HMC305ALP4ETR
- Part No.:
- HMC305ALP4ETR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Attenuators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
HMC305ALP4ETR.pdf
- Description:
- RF ATTENUATOR 0.5-15.5DB 24VFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,268
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Product details
Overview
HMC305ALP4ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 5-bit serial-controlled digital attenuator operating from 0.7 to 3.8 GHz, featuring 0.5 dB LSB steps, ±0.25 dB typical attenuation accuracy, and 15.5 dB total range. It delivers <2.5 dB insertion loss across its band and supports +3V to +5V single-supply operation with CMOS-compatible serial interface - ideal for RF signal level control in cellular infrastructure and test instrumentation.
For engineers reviewing the HMC305ALP4ETR datasheet, HMC305ALP4ETR pinout, HMC305ALP4ETR application, or HMC305ALP4ETR equivalent, key selection criteria include broadband frequency coverage, low bit error (±0.3 dB typical), fast switching (<830 ns), high linearity (IIP3 up to +52 dBm at 5V), and QFN-24 package compatibility with RF PCB layout best practices.
Technical Context
The HMC305ALP4ETR implements a monolithic GaAs MMIC architecture with integrated serial-to-parallel decoder and five independent attenuation bit cells (0.5/1/2/4/8 dB). Its control logic accepts 5-bit serial words via SPI-compatible interface with latch enable, reset, and shift clock inputs - enabling precise state programming without parallel bus overhead.
RF path design uses DC-coupled 50 Ω matched ports (RF1/RF2) requiring external blocking capacitors; bias is delivered through a single Vcc pin via external 5 kΩ resistor. The exposed paddle QFN-24 package ensures thermal stability and RF grounding integrity across -40°C to +85°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 0.7–3.8 GHz - fully characterized broadband operation suitable for multi-band 3G/4G/WiMAX front-end calibration. |
| Attenuation Range & Step | 0–15.5 dB in 0.5 dB LSB increments - enables fine-grained RF power leveling with deterministic step summation. |
| Insertion Loss | 1.2–2.5 dB (freq.-dependent) - low path loss preserves system noise figure and gain budget in cascaded stages. |
| IIP3 | +52 dBm @ 5V, +48 dBm @ 3V - high linearity supports high-dynamic-range receivers and transmitter output control. |
| Switching Time | tON/tOFF ≤ 830 ns - supports real-time AGC loops and fast channel reconfiguration in automated test systems. |
| Control Interface | CMOS/SPI-compatible 5-bit serial input with Reset, Shift Clock, Latch Enable - reduces MCU GPIO count and simplifies firmware integration. |
| Supply Voltage | +3V to +5V - compatible with standard digital supply rails; no auxiliary voltage required. |
Pinout & Package
Package: 24-lead 4×4 mm leadless QFN with exposed thermal paddle (MSL1, RoHS-compliant per HMC305ALP4E variant). Requires soldering of all ground leads and paddle to PCB RF ground plane using recommended land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 6, 10, 12, 13, 15, 16, 18 | N/C | No internal connection; must be grounded externally per RF/DC layout requirements. |
| 2, 17 | RF1, RF2 | DC-coupled 50 Ω RF I/O ports; require external blocking capacitors (e.g., 100–300 pF) for low-frequency operation. |
| 5 | Serial Output | Serial data output delayed by 8 clock cycles - enables daisy-chaining or loopback verification. |
| 7 | Reset | Active-low asynchronous clear of internal shift register - ensures known initial state on power-up or fault recovery. |
| 8 | Shift Clock | Drives serial bit loading into internal 5-bit shift register - supports up to 30 MHz clock rate (5V). |
| 9 | Latch Enable | Transfers shift register contents to attenuation control latches - defines precise timing of attenuation state change. |
| 11 | Serial Input | CMOS-compatible serial data input (LSB first) - accepts 5-bit word defining target attenuation state. |
| 14 | Vcc | +3V to +5V supply input - requires external 5 kΩ resistor for proper biasing per application circuit. |
| 19–24 | GND | Ground terminals including exposed paddle - all must connect to low-inductance RF ground for performance and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5 dB LSB resolution | Enables precise RF gain/loss adjustment in 0.5 dB increments across full 15.5 dB range - critical for closed-loop power control accuracy. |
| ±0.25 dB typical attenuation accuracy | Minimizes calibration overhead in production test and field deployment - reduces need for per-unit correction tables. |
| 5-bit serial interface with Reset & Latch | Reduces control wiring to 4 pins (SI, SCLK, LE, RESET); eliminates parallel bus routing and associated skew issues. |
| +52 dBm IIP3 at 5V | Supports high-input-power applications such as base station transmit chains without distortion-induced adjacent-channel interference. |
| QFN-24 4×4 mm package | Compact footprint with exposed paddle enables high-density RF layout and efficient thermal dissipation in space-constrained modules. |
Applications
| Cellular Base Station Transceivers | WiMAX/WiBro Front-End Modules |
|---|---|
|
Use Scenario: Dynamic output power control in LTE/FDD/TDD macrocell and small-cell transmitters to meet ACLR and spectral mask requirements. IC Role / Device Role / Timing Role: RF signal path attenuator placed between PA driver and final stage, controlled via FPGA or BB processor over SPI. Use Value: Maintains EVM and ACLR compliance across wide output power range (−20 to +43 dBm) while enabling fast TDD slot switching. |
Use Scenario: Receive path gain setting in fixed wireless access CPE units operating in 2.3–2.7 GHz licensed bands. IC Role / Device Role / Timing Role: Programmable IF/RF attenuator in LNA/driver chain, adjusted during link adaptation based on RSSI feedback. Use Value: Extends dynamic range by >40 dB without degrading NF; supports automatic gain control loop bandwidths up to 100 kHz. |
| Automated RF Test Equipment | Phased Array Radar Calibration |
|
Use Scenario: Signal level conditioning in vector network analyzer (VNA) receiver paths and programmable attenuator modules. IC Role / Device Role / Timing Role: Precision reference attenuator in calibration standards and stimulus-response measurement subsystems. Use Value: Delivers traceable 0.5 dB steps with <±0.3 dB bit error - meets MIL-STD-45662A uncertainty requirements for metrology-grade instruments. |
Use Scenario: Element-level amplitude trimming in T/R module beamforming networks for X-band active electronically scanned arrays (AESA). IC Role / Device Role / Timing Role: Per-channel attenuation element synchronized across 128+ channels via daisy-chained serial interface. Use Value: Enables <±0.5° phase perturbation across 0.7–3.8 GHz band - critical for sidelobe suppression and beam pointing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital RF attenuator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC624LP4E | 6-bit resolution (0.25 dB LSB), 0.1–4.0 GHz, higher IIP3 (+55 dBm), same QFN-24 package. | Better suited for ultra-fine power control and wider frequency coverage; requires updated firmware for 6-bit command handling. | Select when sub-0.5 dB resolution or extended low-end frequency response (<0.7 GHz) is required. |
| ADL5240 | 4-bit (1 dB LSB), 0.05–1.8 GHz, integrated detector, different 24-pin QFN (5×5 mm), SPI-only interface. | Lower frequency range and coarser step size; includes RMS detector for closed-loop control - reduces external component count. | Prefer when system operates below 1.8 GHz and integrated power detection simplifies AGC implementation. |
Compared with HMC305ALP4ETR, HMC624LP4E offers finer resolution and broader bandwidth but increases firmware complexity, while ADL5240 trades step resolution and upper-frequency limit for integrated detection - making each alternative optimal only under specific system-level constraints.
Availability
HMC305ALP4ETR is available at Aetrix Electronics and suitable for cellular infrastructure, fixed wireless access, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for HMC305ALP4ETR 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 integrates its high-frequency RF portfolio into precision analog and RF solutions for communications, defense, and instrumentation markets.
The HMC305ALP4ETR belongs to Hittite's GaAs MMIC digital attenuator product line, engineered for broadband RF signal conditioning in infrastructure and test systems where accuracy, speed, and linearity are critical.
FAQ
What is the operating frequency range of the HMC305ALP4ETR?
The HMC305ALP4ETR operates from 0.7 GHz to 3.8 GHz with fully characterized insertion loss, return loss, and attenuation accuracy across this band. Performance remains stable over temperature (-40°C to +85°C) and supply voltage (+3V to +5V), making it suitable for multi-band wireless infrastructure and broadband test equipment applications.
Does the HMC305ALP4ETR require external DC blocking capacitors?
Yes - the HMC305ALP4ETR has DC-coupled RF1 and RF2 ports that require external blocking capacitors (e.g., 100–300 pF in 0402 package) to prevent DC path disruption and ensure proper 50 Ω impedance matching at the lowest operating frequency. This is mandatory per the application circuit and evaluation board design.
What is the function of Pin 5 (Serial Output) on the HMC305ALP4ETR?
Pin 5 is the Serial Output terminal, providing the shifted-out version of the serial input data delayed by exactly eight clock cycles. This feature allows daisy-chaining multiple HMC305ALP4ETR devices or verifying correct data loading via loopback, enhancing system-level debug and configuration reliability.
Can the HMC305ALP4ETR operate from a 3.3 V supply?
Yes - the HMC305ALP4ETR is fully specified for 3.0 V to 5.0 V operation. At 3.3 V, it maintains 15.5 dB attenuation range, ±0.3 dB typical bit error, and +48 dBm IIP3, though switching time increases slightly (tON/tOFF ≤ 830 ns max) and input P1dB drops to +23 dBm.
Is the HMC305ALP4ETR pin-compatible with other Hittite digital attenuators?
No - the HMC305ALP4ETR uses a unique 24-pin QFN layout optimized for its 5-bit serial interface and RF port placement. While HMC624LP4E shares the same 4×4 mm QFN-24 footprint, pin functions differ (e.g., additional control lines), so PCB redesign is required for substitution.
HMC305ALP4ETR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 24-VFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Attenuation Value:
- 0.5dB ~ 15.5dB
- Frequency Range:
- 700 MHz ~ 3.8 GHz
- Power (Watts):
- -
- Impedance:
- 50 Ohms
- Grade:
- -
- Qualification:
- -
HMC305ALP4ETR FAQ
1.How can I place an order for HMC305ALP4ETR through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC305ALP4ETR 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 HMC305ALP4ETR reliable?
The price and inventory of HMC305ALP4ETR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC305ALP4ETR is usually 5 days.
3.What payment methods are accepted for HMC305ALP4ETR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC305ALP4ETR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC305ALP4ETR?
HMC305ALP4ETR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC305ALP4ETR 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 HMC305ALP4ETR?
For technical support, including HMC305ALP4ETR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC305ALP4ETR requirements.
6.How does Aetrix verify that HMC305ALP4ETR is sourced from the original manufacturer or authorized distributors?
All HMC305ALP4ETR 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 HMC305ALP4ETR meets industry standards.
7.What is the process for return or replacement of HMC305ALP4ETR?
All HMC305ALP4ETR units undergo pre-shipment inspection (PSI). If there is an issue with HMC305ALP4ETR, 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 HMC305ALP4ETR part is unused and in its original packaging.
Return procedure for HMC305ALP4ETR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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