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 lsusb 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.
See SainSmart DDS120/Info for more details (such as lsusb -v output) about the device.
- USB: Cypress CY7C68013A-100AXC (FX2LP) (datasheet)
- 64-kbyte I²C EEPROM: Microchip 24LC64I (datasheet)
- Crystal: 24MHz
- 145 MHz FastFET Opamps: AD8065ART-R2: (datasheet)
Or in newer hardware:
- Dual 8bit, 100MSPS ADC: MXTronix MXT2088 (datasheet)
- 145 MHz FastFET Opamps: AD8065: (datasheet)
- 4x CMOS differential 4-channel analog mux/demux with logic-level conversion: Texas Instruments CD4052B(M) (datasheet)
Teardown 2 (purchased 03/2016):
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 historic vendor firmware/protocol info for those interested, though.
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 this section for technical details about the firmware/hardware.