Vaunix TS-LDA-602 Compact Miniature USB-Programmable RF Digital Attenuator
| Brand | Vaunix |
|---|---|
| Origin | Italy |
| Model | LDA-602 |
| Frequency Range | DC to 20 GHz |
| Interface | USB 2.0 |
| Attenuation Range | 0–63 dB in 1 dB steps |
| Insertion Loss | < 2.5 dB (typ. at 18 GHz) |
| VSWR | < 1.5 (up to 18 GHz) |
| Power Handling | +27 dBm (max, CW) |
| Operating Temperature | –10 °C to +60 °C |
| Compliance | RoHS 3, CE, FCC Part 15 Subpart B |
Overview
The Vaunix TS-LDA-602 is a compact, USB-programmable digital step attenuator engineered for precision RF signal conditioning in automated test environments, R&D laboratories, and production line validation systems. Based on monolithic microwave integrated circuit (MMIC) architecture with solid-state PIN diode switching, the device delivers repeatable, low-distortion attenuation across a continuous frequency range from DC to 20 GHz. Its fully integrated USB 2.0 interface eliminates the need for external controllers or GPIB adapters, enabling direct integration with Windows-, Linux-, and macOS-based test software via standard HID-class drivers. Designed for minimal footprint and thermal stability, the TS-LDA-602 features a hermetically sealed aluminum housing (49.5 × 29.5 × 12 mm), optimized for conduction cooling and EMI shielding in densely packed ATE racks or benchtop setups.
Key Features
- 63 dB total attenuation range with 1 dB resolution, digitally selectable via USB command set (SCPI-compatible syntax)
- Low insertion loss (< 2.5 dB typical at 18 GHz) and excellent impedance match (VSWR < 1.5 up to 18 GHz)
- High power handling capability: +27 dBm (0.5 W) continuous wave, with built-in thermal derating logic above 60 °C
- Firmware-upgradable via USB; supports user-defined attenuation profiles and sequence scripting
- No external power supply required — bus-powered from standard USB 5 V ±5% (max current draw: 120 mA)
- Integrated EEPROM stores calibration coefficients and serial identification; supports traceable calibration certificate options
Sample Compatibility & Compliance
The TS-LDA-602 is compatible with standard 50 Ω RF systems and interfaces seamlessly with vector network analyzers (VNAs), spectrum analyzers, signal generators, and software-defined radios (SDRs). It accepts SMA female connectors on both input and output ports, with gold-plated contacts rated for >5,000 mating cycles. The unit complies with RoHS 3 Directive 2015/863/EU, CE marking requirements under EMC Directive 2014/30/EU and RED Directive 2014/53/EU, and FCC Part 15 Subpart B Class B emissions limits. For regulated industries, firmware logging and USB command audit trails support alignment with GLP and GMP documentation practices; optional NIST-traceable calibration reports are available upon request.
Software & Data Management
Vaunix provides the free, cross-platform LDA Control Suite — a GUI application and dynamic link library (DLL) supporting C/C++, Python (PyUSB), MATLAB, LabVIEW (NI-VISA), and .NET frameworks. The API enables full remote control of attenuation state, real-time status polling (temperature, voltage, error flags), and synchronization with external triggers via TTL-compatible GPIO (optional accessory module). All USB transactions include CRC-16 error checking, and the device implements non-volatile memory write protection to prevent accidental configuration corruption. Data export formats include CSV and XML, with timestamped logs suitable for audit-ready test records per ISO/IEC 17025 requirements.
Applications
- Automated receiver sensitivity testing in wireless communication system validation (5G NR, Wi-Fi 6E/7, Bluetooth LE)
- Dynamic range extension and gain staging in RF component characterization (filters, amplifiers, mixers)
- Signal level emulation for EMC immunity testing per IEC 61000-4-3 and MIL-STD-461G
- Calibration reference path management in metrology-grade VNA configurations
- Embedded loopback diagnostics in aerospace avionics BIT (Built-In Test) architectures
- Education and prototyping platforms requiring programmable RF signal scaling without RF switch complexity
FAQ
Is the TS-LDA-602 compatible with Linux operating systems?
Yes — the device operates as a USB HID class-compliant peripheral; open-source drivers and Python examples are provided in the official SDK.
Does it support SCPI commands?
While not fully SCPI-compliant, it implements a deterministic ASCII command set closely aligned with SCPI syntax for attenuation setting, query, and status reporting.
Can multiple TS-LDA-602 units be controlled simultaneously over one USB host?
Yes — each unit is assigned a unique serial number; the LDA Control Suite and API support multi-device enumeration and parallel command execution.
What is the typical settling time after an attenuation change?
<100 µs for any 1 dB step within the 0–63 dB range, verified using high-speed RF sampling oscilloscopes.
Is calibration required before first use?
The factory calibration is stored in onboard EEPROM and applied automatically; optional annual recalibration services are available with NIST-traceable documentation.
