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Analog Devices Inc. 104976-HMC274QS16
- Part No.:
- 104976-HMC274QS16
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
104976-HMC274QS16.pdf
- Description:
- EVAL BOARD HMC274QS16
- Quantity:
- Payment:
- Shipping:
Inventory:4,301
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Product details
Overview
HMC274QS16 from Analog Devices (formerly Hittite Microwave) is a GaAs IC 5-bit digital attenuator operating from 0.7 to 2.7 GHz with 1 dB LSB steps, ±0.5 dB typical bit error, and <2.7 dB typical insertion loss. It serves as a precision RF signal level controller in baseband-to-IF/RF paths of wireless infrastructure transceivers.
For engineers reviewing the HMC274QS16 datasheet, HMC274QS16 pinout, HMC274QS16 application, or HMC274QS16 equivalent, key selection criteria include frequency coverage (0.7–2.7 GHz), attenuation accuracy (±0.35 dB + 5% at 0.7–1.4 GHz), IIP3 (+54 dBm @ Vdd=5V), and QSOP16-compatible control interface requiring +3 to +5 V logic levels.
Technical Context
The HMC274QS16 implements a monolithic GaAs-based switched-resistor ladder architecture with five independent CMOS-compatible control inputs (V1–V5), each toggling between 0 V and Vdd (+3 to +5 V) to select 1–16 dB bit states. All bits are active simultaneously, enabling summing of attenuation values up to 31 dB.
It features DC-coupled 50 Ω RF ports (RF1 and RF2), requires external DC blocking capacitors (100–300 pF), and draws bias via a single 5 kΩ resistor connected to Pin 9 or Pin 16. Operating temperature range is –40 °C to +85 °C with MSL1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 0.7–2.7 GHz - fully specified performance across cellular, PCS, 3G, and 2.4 GHz ISM bands |
| Attenuation Range & Step | 0–31 dB in 1 dB LSB increments - enables fine-grained RF gain control without interpolation |
| Insertion Loss | ≤2.7 dB max (2.3 dB typ @ 1.4–2.3 GHz) - minimizes signal path degradation in cascaded stages |
| IIP3 | +54 dBm @ Vdd = 5 V - supports high-linearity operation in multi-tone LTE/WiMAX transmit chains |
| Bit Accuracy | ±0.35 dB + 5% of setting (0.7–1.4 GHz) - ensures predictable attenuation state matching in closed-loop AGC |
| Switching Time | 600 ns max tON/tOFF - compatible with fast-settling digital predistortion and beamforming update rates |
| Control Interface | +3 to +5 V single-supply positive logic - eliminates need for level shifters when interfacing with FPGA/CPLD GPIO |
Pinout & Package
Package: 16-lead QSOP (Low Stress Injection Molded Plastic, Sn/Pb lead finish, MSL1, 235 °C peak reflow). Dimensions per JEDEC MO-137, 0.15 mm moldflash exclusion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 8, 10–15 | GND | DC ground connection - all must be soldered directly to PCB RF ground plane for impedance stability and thermal dissipation |
| 3–7 | V1–V5 | Bit control inputs - TTL/CMOS-compatible; low = 0–0.2 V, high = Vdd ±0.2 V; drive ≤100 µA |
| 9 | RF1 | RF input port - DC-coupled, 50 Ω matched; requires external blocking capacitor (100–300 pF) |
| 16 | RF2 | RF output port - DC-coupled, 50 Ω matched; requires external blocking capacitor (100–300 pF) |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic GaAs process | Enables broadband 0.7–2.7 GHz operation with consistent attenuation accuracy and phase tracking |
| 5-bit binary-weighted architecture | Supports deterministic 31 dB total attenuation using only five control lines - no microcontroller firmware overhead |
| Single +3 to +5 V supply | Eliminates dual-rail biasing; simplifies power delivery and reduces BOM count in compact RF modules |
| High linearity (IIP3 ≥ +52 dBm) | Maintains signal fidelity in wideband OFDM systems (e.g., LTE, WiMAX) without distortion-induced EVM degradation |
| QSOP16 footprint compatibility | Enables drop-in replacement in existing Hittite/HMC evaluation boards (e.g., Eval PCB 104976) and production layouts |
Applications
| Cellular Base Station Transceivers | 2.4 GHz ISM Band Radios |
|---|---|
|
Use Scenario: Dynamic gain control in macrocell BTS transmit chain to maintain constant output power across varying modulation bandwidths and channel conditions. IC Role / Device Role / Timing Role: Precision RF attenuator placed between DAC output and PA driver stage to implement closed-loop AGC with ≤1 dB step resolution. Use Value: Enables compliance with ACLR and EVM specs under PAPR >10 dB by preventing PA saturation during burst transmission. |
Use Scenario: Adjustable output power control in IEEE 802.15.4/Zigbee and proprietary 2.4 GHz ISM transceivers for regulatory compliance and coexistence tuning. IC Role / Device Role / Timing Role: Digitally programmable attenuation element in RF front-end to replace mechanical potentiometers or analog VGAs. Use Value: Provides repeatable, temperature-stable attenuation (±0.5 dB bit error) across –40 °C to +85 °C industrial environments. |
| Wireless Data Infrastructure | Test & Measurement Signal Sources |
|
Use Scenario: Programmable loss compensation in point-to-point microwave backhaul radios to adapt to variable cable/fiber path losses. IC Role / Device Role / Timing Role: Calibration-grade attenuator in IF/RF signal path to normalize amplitude response across multiple channelized receivers. Use Value: Delivers ±0.35 dB accuracy over 0.7–1.4 GHz band - sufficient for factory calibration of multi-channel SDR platforms. |
Use Scenario: Stepped attenuation stage in lab-grade RF signal generators to provide precise, repeatable output level settings. IC Role / Device Role / Timing Role: Digitally controlled RF conditioning block between synthesizer and output amplifier to support 0.1 dB resolution sweeps. Use Value: Achieves 600 ns switching time and <2.7 dB insertion loss - critical for fast, low-error automated test sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5-bit digital attenuator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC274QS16E | RoHS-compliant version with matte tin lead finish and 260 °C peak reflow rating; identical electrical specs and pinout | Required for lead-free manufacturing; same RF performance but different assembly process window | Select HMC274QS16E for new designs targeting RoHS compliance; HMC274QS16 remains valid for legacy Sn/Pb processes |
| Qorvo QM11036 | 5-bit GaAs MMIC attenuator, 0.7–2.7 GHz, 1 dB LSB, but uses negative control logic (–3 V to 0 V) and requires dual supply | Not pin-compatible; demands level-shifting circuitry and separate negative bias rail | Consider QM11036 only if redesigning control interface and requiring extended temperature range (–55 °C to +105 °C) |
Compared with HMC274QS16, the HMC274QS16E offers identical RF performance with RoHS-compliant packaging, while QM11036 introduces control logic incompatibility and higher system-level complexity despite similar frequency and attenuation specs.
Availability
HMC274QS16 is available at Aetrix Electronics and suitable for cellular infrastructure, 2.4 GHz ISM radio design, and wireless data equipment requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for HMC274QS16 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, including GaAs MMICs and integrated solutions for communications and defense markets.
The HMC274QS16 belongs to Hittite's legacy digital attenuator family, designed specifically for broadband RF gain control in wireless infrastructure where precision, speed, and linearity are critical.
FAQ
What is the absolute maximum RF input power rating for the HMC274QS16?
The HMC274QS16 has an absolute maximum RF input power rating of +30 dBm across 0.7–2.7 GHz, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage to the GaAs die. For reliable linear operation, the datasheet recommends staying below +29 dBm (P0.1dB) at Vdd = 5 V and +20 dBm at Vdd = 3 V.
Does the HMC274QS16 require external DC blocking capacitors on RF1 and RF2?
Yes, the HMC274QS16 requires external DC blocking capacitors on both RF1 (Pin 9) and RF2 (Pin 16), as stated in the Application Circuit and Pin Descriptions sections. Capacitor value should be selected between 100 pF and 300 pF to pass the lowest operational frequency with minimal insertion loss - for example, 220 pF supports down to ~0.7 GHz.
What is the recommended biasing method for the HMC274QS16 Vdd supply?
The HMC274QS16 requires a single +3 to +5 V DC supply applied through an external 5 kΩ resistor connected to either Pin 9 (RF1) or Pin 16 (RF2), as shown in the Application Circuit. This resistor limits current and provides proper biasing; no additional decoupling is required beyond standard RF layout practices.
Is the HMC274QS16 pin-compatible with the HMC274QS16E?
Yes, the HMC274QS16 and HMC274QS16E share identical pinout, package dimensions, and electrical specifications. The only differences are lead finish (Sn/Pb vs. matte Sn) and MSL reflow profile (235 °C vs. 260 °C), making them mechanically and functionally interchangeable in most PCB layouts.
What is the typical phase variation across attenuation states for the HMC274QS16?
The HMC274QS16 exhibits relative phase variation of less than ±10° across all attenuation states from 0.7 to 2.7 GHz, as shown in the "Relative Phase vs. Frequency" plot in the datasheet. This low phase dispersion ensures minimal group delay distortion in wideband applications such as OFDM and QAM modulation schemes.
104976-HMC274QS16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Type:
- Attenuator
- Frequency:
- 700MHz ~ 2.7GHz
- Contents:
- Board(s)
- Utilized IC / Part:
- HMC274QS16
104976-HMC274QS16 FAQ
1.How can I place an order for 104976-HMC274QS16 through Aetrix?
Please submit a Request for Quotation (RFQ) for 104976-HMC274QS16 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 104976-HMC274QS16 reliable?
The price and inventory of 104976-HMC274QS16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 104976-HMC274QS16 is usually 5 days.
3.What payment methods are accepted for 104976-HMC274QS16?
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104976-HMC274QS16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 104976-HMC274QS16 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 104976-HMC274QS16?
For technical support, including 104976-HMC274QS16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 104976-HMC274QS16 requirements.
6.How does Aetrix verify that 104976-HMC274QS16 is sourced from the original manufacturer or authorized distributors?
All 104976-HMC274QS16 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 104976-HMC274QS16 meets industry standards.
7.What is the process for return or replacement of 104976-HMC274QS16?
All 104976-HMC274QS16 units undergo pre-shipment inspection (PSI). If there is an issue with 104976-HMC274QS16, 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 104976-HMC274QS16 part is unused and in its original packaging.
Return procedure for 104976-HMC274QS16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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