Velleman PCSGU250

File:Velleman PCSU250.jpg

Velleman PCSU250

The [1] is an inexpensive USB-based oscilloscope. It has 2 channels, an analog bandwidth of 12MHz and 25MS/s sampling rate.

See Velleman PCSU250/Info for more details (such as lsusb -vvv output) about the device.

Hardware

Control logic

• Xilinx XC3S50 50K-gate FPGA
• 50MHz crystal: 50.000 Y0KE (clock source for the Xilinx FPGA)
• Microchip PIC16F630-I/P 8-bit microcontroller

USB interface

• FTDI FT245BL USB interface chip
• 6MHz crystal
• Microchip 93LC46BI 128-byte EEPROM chip for the FTDI chip's USB settings

Analog frontend

• 2 x Unisonic ULN2003 7-channel darlington sink driver (each driving a set of 7 relays)
• 14 x SIR-S4-105A FZ Goodsky 5V relay (7 per input channel)
• 2 x Texas Instruments OPA354 op-amps
• 2 x National Semiconductor LMH6724 op-amps
• 2 x Texas Instruments ADC08L060 8-bit 60MSPS A/D converters

Channel triggers

• NXP 74LVC07AD Hex non-inverting buffers
• Texas Instruments TLC5620 8-bit quad DAC
• Texas Instruments TLC372 dual differential comparator

Power

• 3 x Texas Instruments TPS766xx voltage regulators (IC19=1V, IC20=2.5V, IC21=3.3V)

?

• Philips/NXP 74HC367D Hex buffer/line driver

Photos

• 

  Back

• 

  Side

• 

  PCB, front

• 

  PCB, back

• 

  main ICs

• 

  main ICs detail

• 

  PCB, chunk

• 

  Xilinx XC3S50

• 

  Microchip PIC16F630-I/P

• 

  FTDI FT245BL

• 

  Microchip 93LC46BI

• 

  Philips/NXP 74HC367D

• 

  3x SOIC-8 chips

• 

  50MHz crystal

• 

  Input sections

• 

  Input section detail

• 

  Input section detail

• 

  UTC ULN2003

• 

  SIR-S4-105A FZ

Protocol

TODO.

Resources

• The vendor software appears to have been written by Magnova Components.