3.1.1. Red Pitaya boards comparison

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Red Pitaya is available in three versions, all offer the same functions and features with the difference in technical specification of high-frequency inputs and outputs, RAM capacity some other differences (find more info in the comparison table bellow). They are addressed to target different groups and / or needs. Where STEMlab 14 has 14bit input / output channels for highly accurate measurement results in professional environment, STEMlab 10 has 10bit input / output channels and is perfect for universities,students and makers, SDRlab 122-16 is tailored for SDR applications.

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Basic
  STEMlab 125-10 STEMlab 125-14 STEMlab 125-14-Z7020 SDRlab 122-16 SIGNALlab 250-12
Processor Processor DUAL CORE ARM CORTEX A9 Processor DUAL CORE ARM CORTEX A9 Processor DUAL CORE ARM CORTEX A9 Processor DUAL CORE ARM CORTEX A9 Processor DUAL CORE ARM CORTEX A9
FPGA FPGA Xilinx Zynq 7010 SOC FPGA Xilinx Zynq 7010 SOC FPGA Xilinx Zynq 7020 SOC FPGA Xilinx Zynq 7020 SOC FPGA Xilinx Zynq 7020 SOC
RAM 256MB (2Gb) 512MB (4Gb) 512MB (4Gb) 512MB (4Gb) 1GB (8Gb)
System memory Micro SD up to 32GB Micro SD up to 32GB Micro SD up to 32GB Micro SD up to 32GB Micro SD up to 32GB
Console connection USB to serial converter required micro USB micro USB micro USB USB-C
Power connector Micro USB Micro USB Micro USB Micro USB Power Jack
Power consumption 5V, 1,5A max 5V, 2A max 5V, 2A max 5V, 2A max 24V, 0.5A max
Connectivity
  STEMlab 125-10 STEMlab 125-14 STEMlab 125-14-Z7020 SDRlab 122-16 SIGNALlab 250-12
Ethernet 1Gbit 1Gbit 1Gbit 1Gbit 1Gbit
USB USB 2.0 USB 2.0 USB 2.0 USB 2.0 2 x USB 2.0
WIFI requires WIFI dongle requires WIFI dongle requires WIFI dongle requires WIFI dongle requires WIFI dongle
Synchronisation / Daisy chain connector (up to 500 Mbps) Daisy chain connector (up to 500 Mbps) Daisy chain connector (up to 500 Mbps) Daisy chain connector (up to 500 Mbps)
RF inputs
  STEMlab 125-10 STEMlab 125-14 STEMlab 125-14-Z7020 SDRlab 122-16 SIGNALlab 250-12
RF input channels 2 2 2 2 2
Sample rate 125 MS/s 125 MS/s 125 MS/s 122.88 MS/s 250 MS/s
ADC resolution 10 bit 14 bit 14 bit 16 bit 12 bit
Input impedance 1MOhm/10pF 1MOhm/10pF 1MOhm/10pF 50 Ohm 1MOhm
Full scale voltage range ±1V (LV) and ±20V (HV) ±1V (LV) and ±20V (HV) ±1V (LV) and ±20V (HV) 0.5Vpp/-2dBm +-1V / +-20V (software selectable)
Input coupling DC DC DC AC AC / DC (software selectable)
Absolute max. Input voltage range 30V 30V 30V DC max 50V (AC-coupled) 1 Vpp for RF 30V
Input ESD protection Yes Yes Yes Yes Yes
Overload protection Protection diodes Protection diodes Protection diodes DC voltage protection Protection diodes
Bandwidth DC-50MHz DC-60MHz DC-60MHz 300 kHz - 550 MHz DC - 60MHz
RF outputs
  STEMlab 125-10 STEMlab 125-14 STEMlab 125-14-Z7020 SDRlab 122-16 SIGNALlab 250-12
RF output channels 2 2 2 2 2
Sample rate 125 MS/s 125 MS/s 125 MS/s 122.88 MS/s 250 MS/s
DAC resolution 10 bit 14 bit 14 bit 14 bit 12 bit
Load impedance 50 Ohm 50 Ohm 50 Ohm 50 Ohm 50 Ohm
Voltage range ±1V ±1V ±1V 1Vpp/ +4 dBm +-2V / +-10V (Hi-Z load) (software selectable)
Short circut protection Yes Yes Yes N/A, RF transformer & AC-coupled Yes
Connector type SMA SMA SMA SMA BNC
Output slew rate 2V / 10ns 2V / 10ns 2V / 10ns N/A 10V / 17ns
Bandwidth DC-50MHz DC-60MHz DC-60MHz 300 kHz - 60 MHz DC - 60MHz
Extension connector
  STEMlab 125-10 STEMlab 125-14 STEMlab 125-14-Z7020 SDRlab 122-16 SIGNALlab 250-12
Digital IOs 16 16 16 16 16
Analog inputs 4 4 4 4 4
Analog inputs voltage range 0-3,5V 0-3,5V 0-3,5V 0-3,5V 0-3,5V
Sample rate 100kS/s 100kS/s 100kS/s 100kS/s 100kS/s
Resolution 12bit 12bit 12bit 12bit 12bit
Analog outputs 4 4 4 4 4
Analog outputs voltage range 0-1,8V 0-1,8V 0-1,8V 0-1,8V 0-1,8V
Communication interfaces I2C, SPI, UART I2C, SPI, UART I2C, SPI, UART I2C, SPI, UART I2C, SPI, UART, USB
Available voltages +5V,+3,3V,-4V +5V,+3,3V,-4V +5V,+3,3V,-4V +5V,+3,3V,-4V +5V,+3,3V,-4V
external ADC clock N/A yes yes yes yes
Synchronisation
  STEMlab 125-10 STEMlab 125-14 STEMlab 125-14-Z7020 SDRlab 122-16 SIGNALlab 250-12
Trigger input through extension connector through extension connector through extension connector through extension connector through BNC connector
Daisy chain connection N/A over SATA connection over SATA connection over SATA connection over SATA connection
Ref. clock input N/A N/A N/A N/A through BNC connector

Note

RedPitaya devices:

  • should be operated at normal conditions with ambient temperatures not exceeding 30°C (86°F) and should not be covered.
  • are intended for Indoor use, maximum altitude: 2000 m, pollution degree 2, and relative humidity ≤90%
  • intended for use with low-voltage energy sources and signals: it should not be used in any direct connection with voltages above 30 volts.

Warning

All inputs and outputs available through (SMA/BNC) connectors share a common ground connected to the power supply ground.

Warning

Power supply precautions:

  • STEMlab 125-14, STEMlab 125-14-Z7020, STEMlab 125-10, SDRlab 122-16 shall only be powered by an isolated external power supply providing 5 volts direct current, and a maximum current of 2 amperes. The KA23-0502000DES model is recommended. Any other external power supply used with Red Pitaya must comply with relevant regulations and standards applicable in the country of use.
  • SIGNALlab 250-12 shall only be powered by an original KA2401A 24V/1A isolated power supply.