Red Pitaya - 4-Channel Measurements
STEMlab 125-14 4-Input[edit | edit source]
STEMlab 125-14 4 Inputs is based on STEMlab 125-14 board, but instead of 2 inputs and 2 output channels offers 4 Input channels that with improved performance and it is based on the Xilinx ZYNQ 7020 SoC processor.
STEMlab 125-14 4-Input is a single-board RF signal acquisition platform that offers the same general hardware features as STEMlab 125-14. The main differences/benefits are that:
There are 4 analog input channels @ 125MSPS & 14 bits (instead of 2 inputs and 2 outputs).
RF inputs come with better performance (less cross-talk, noise, and distortions).
ZYNQ 7020 (bigger FPGA that offers more processing capabilities and more digital IO pins available on the extension connector).
Switching between internal and external clocks can be done using a jumper or control signal on the extension connector.
The internal ADC clock can be locked to an external reference clock via an extension connector (this feature is optional at the moment).
Technical specifications[edit | edit source]
Basics[edit | edit source]
Processor | DUAL CORE ARM CORTEX A9 |
---|---|
FPGA | FPGA Xilinx Zynq 7020 SOC |
RAM | 512 MB (4 Gb) |
System memory | Micro SD up to 32 GB |
Console connection | Micro USB |
Power connector | Micro USB |
Power consumption | 5 V, 2 A max |
Connectivity[edit | edit source]
Ethernet | 1 Gbit |
USB | USB 2.0 |
WIFI | optional, requires WIFI dongle |
RF Inputs[edit | edit source]
RF input channels | 4 |
Sample rate | 125 MS/s |
ADC resolution | 14 bit |
Input impedance | 1 MOhm / 10 pF |
Full scale voltage range | ±1 V (LV) and ±20 V (HV) |
Input coupling | DC |
Absolute max. Input voltage range | 30 V |
Input ESD protection | Yes |
Overload protection | Protection diodes |
Bandwidth | DC - 60 MHz |
Extension Connector[edit | edit source]
Digital IOs | 20 |
Analog inputs | 4 |
Analog inputs voltage range | 0-3.5 V |
Sample rate | 100 kS/s |
Resolution | 12 bit |
Analog outputs | 4 |
Analog outputs voltage range | 0-1.8 V |
Communication interfaces | I2C, SPI, UART |
Available voltages | +5 V, +3.3 V, -4 V |
external ADC clock | yes |
Synchronization[edit | edit source]
Trigger input | Through extension connector |
Daisy chain connection | Over SATA connection (up to 500 Mbps) |
Ref. clock input | N/A |
Software[edit | edit source]
Dedicated apps have been specially developed for this hardware model because of the different hardware configuration. Depicted in the picture above are the main menu, the Spectrum analyzer app with 4 traces and also the Oscilloscope.
Also this hardware model can be controlled via the SCPI protocol from C, Phyton, LABview or Matlab. More documentation can be found here: SCPI
FPGA build: FPGA
Source Code: all the Red Pitaya available code can be found here.