STEMlab 125-14 LN (Discontinued)

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Note

STEMlab 125-14 LN is discontinued (no longer produced). The documentation here is provided as a reference for existing users.



Overview

The STEMlab 125-14 Low Noise (LN) is a variant of the standard STEMlab 125-14 with populated linear analog power supply regulators. Replacing the default switching regulators with linear ones reduces noise on the analog power rails, lowering the noise floor of the RF inputs and outputs and improving ENOB (Effective Number of Bits).

To find out more about the performance improvements, refer to Leonhard Neuhaus’s blog: Red Pitaya DAC performance.


Features

  • 14-bit, 125 MS/s ADC and DAC

  • Linear analog power supplies for improved noise performance

  • Dual-core ARM Cortex-A9 processor

  • FPGA Xilinx Zynq 7010 SoC

  • 512 MB RAM

  • 16 digital I/Os, 4 analog inputs, 4 analog outputs

  • Multiple communication interfaces: I2C, SPI, UART, CAN

  • Micro USB connectivity for power and console

  • SATA daisy-chain connectors for multi-board synchronisation


Quick Reference

Category

Key Specifications

ADC

2 channels, 14-bit, 125 MS/s, DC-60 MHz

DAC

2 channels, 14-bit, 125 MS/s, DC-60 MHz

Processor

Dual-core ARM Cortex-A9

FPGA

Xilinx Zynq 7010 SoC

RAM

512 MB

Digital I/O

16 GPIOs @ 3.3V

Analog I/O

4 inputs (12-bit), 4 outputs (8-bit)

Connectivity

Ethernet, USB, Extension connectors

Special Features

Linear power supplies, Low Noise

Differences from Standard STEMlab 125-14

This board is electrically identical to the STEMlab 125-14 with the following difference:

Parameter

STEMlab 125-14

STEMlab 125-14 LN

Analog power supply regulators

Switching regulators (not populated)

Linear regulators (populated)

Analog power supply noise

Higher (switching artefacts present)

Lower (clean linear supply)

RF output noise floor

Standard

Reduced

Output ENOB

Standard

Improved

Power consumption

Lower

Slightly higher (linear regulators)

Technical Specifications

The STEMlab 125-14 LN has the same specifications as the standard STEMlab 125-14, with the following enhancement:

  • Linear analog power supply regulators: Populated linear regulators replace the default switching regulators, reducing noise on the analog rails and improving output ENOB.

For full technical specifications, please refer to the STEMlab 125-14 specifications.

See also

For more detailed information, please refer to the Original Gen board comparison table.


Performance & Measurements

Note

Although we do not have specific measurements for the STEMlab 125-14 LN board, the performance of the fast analog inputs is the same as for STEMlab 125-14. The output performance with linear power supplies is covered in Leonhard Neuhaus’s blog about Red Pitaya DAC performance.

You can find the measurements of the fast analog frontend here:


Schematics & 3D Models

Schematics

Note

Full hardware schematics for the Red Pitaya board are not available. Red Pitaya has open-source code but not open hardware schematics. Nonetheless, development schematics are available. This schematic will give you information about hardware configuration, FPGA pin connections, and similar.

Mechanical Specifications & 3D Models


Additional Resources

For additional specifications and measurements, please refer to: