SainSmart DDS120

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The SainSmart DDS120 is a USB-based, 2-channel oscilloscope with an analog bandwidth of 20MS/s and 50MS/s sampling rate.

This device appears to be a rebadge of the Rocktech BM102 (or vice versa). The SainSmart DDS120/Info is exactly the same, the PCB is exactly the same (both have a "656517" and "102LJT1402" silkscreen), and the components used appear to be the same as well.

The device was apparently created by someone named "buudai" in 2012 (also reflected in the SainSmart DDS120/Info and in the former buudai.com website).

See SainSmart DDS120/Info for more details (such as lsusb -v output) about the device.

Hardware

Or in newer hardware:

Photos

Teardown 1:

Device, top

PCB, front

PCB, front

PCB, front

PCB, front

PCB, front

PCB, front

PCB, back

PCB, back

Box

Box

Box

Teardown 2 (purchased 03/2016):

Sticker

Package contents

Device, top

Device, bottom

USB

Connectors

PCB, top

PCB, bottom

MXTronix MXT2088

Cypress FX2

Microchip 24LC64I

TI CD4052BM

AMS1117-3.3

Unknown IC

Protocol

We use an open-source firmware for this device (i.e., not the vendor firmware/protocol), hence we do not need to know the vendor protocol. There is some SainSmart_DDS120/Info#Vendor_firmware for those interested, though.

Firmware

In order to use this device, the sigrok-firmware-fx2lafw (>= 0.1.4) firmware is required.

The firmware was originally written by Jochen Hoenicke (see README for details), thanks a lot!

Note: The firmware is not flashed into the device permanently! You only need to make it available in the usual place where libsigrok looks for firmware files, it will be used automatically (and "uploaded" to the Cypress FX2's SRAM every time you attach the device to a USB port).

Note: On Windows, you will have to assign the WinUSB driver via Zadig twice: the first time for the initial USB VID/PID the device has when attaching it via USB (04b4:602a or 04b5:602a, depending on which vendor driver is currently being used by the device), and a second time after the firmware has been uploaded to the device and the device has "renumerated" with a different VID/PID pair (1d50:608e).

See SainSmart_DDS120/Info#Open-source_firmware_details for technical details about the firmware/hardware.

Resources