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 PIC18LF2450-I/SP 8-bit microcontroller

USB interface

• inluded in the PIC

Analog frontend

• 4 x SIR-S4-105A IZ Goodsky 5V relay (2 per input channel)
• 2 x Texas Instruments OPA2354 op-amps
• 1 x Analog Devices AD9288BST-40 Dual 8-bit 40MSPS A/D converters

Power

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

Signal Generator

• DAC0800LCM 8-Bit Digital-to-Analog Converter Settling Time 0.1 µs, does that mean max. 10Mhz Sample rate?
• 74HCT4051D 8-channel analog multiplexer/demultiplexer with 15 resistors, is that a R2R DAC???
• [http://www.b-kainka.de/Daten/OPV/tl081crev1.pdf ����TL081C] JFET OPAMP

• [link name] exp

FROM HERE ON ONLY COPY&PASTE, TO BE CORRECTED

Channel triggers

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

Photos

• 

  PCB, front

• 

  PCB, back

• 

  signal generator?

• 

  signal generator?

Protocol

TODO.

Resources

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