Downloads

System software, User Manuals, and App Notes for free download

These distributions include the most recent and complete versions
The last table column contains the file size in bytes
Windows and Linux supported

To download from ...

• Microsoft Internet Explorer, right click and select Save Target As...
• Mozilla Firefox, right click and select Save Link As...

Tables of interest below are ...

   • USBxCH 24 bit 4 or 8 channel A/D with GPS
   • SER1CH-UA ultra low power RS232 serial A/D
   • VREF-399 precision voltage reference

• PDF Papers and App Notes
• Component Specs

What's new as of ...

2025/11/15

Reduced excess USBxCH Pak2Bin info messages

2022/03/25

Better USBxCH timing after GPS signal loss or daylight savings change

2021/06/15

Better USBxCH pipeline chain shutdown and improved reporting

Checksum info ...

MD5 and SHA256 checksums for the files listed on this download page are included in the file SrCheck.txt.
For information about the checksums and how to use them refer to the file SrCheckReadMe.txt.

The checksums of SrCheck.txt itself are:

• MD5 = 6818c5c30096306e38b63f707dae00f8
• SHA256 = e9f03af7de609411182c12fd835dbc4e9571dfee9f258b0d46650c871dc6a1fd

System Software

USBxCH 24 bit A/D's with GPS Timing
Category	Description	Rev	File	# bytes
Product Flyer	USB4CH specs	2012/01/15	flyusb4ch.pdf	152,815
Product Flyer	USB8CH specs	2014/02/15	flyusb8ch.pdf	154,057
User Manual	USBxCH	2015/12/01	manusbxch.pdf	1,589,352
System Software	Windows 7/8/10 32+64 bit	2025/11/15	usbwin.zip	23,361,718
System Software	Linux 64 bit ( Ubuntu 18.04 LTS, kernel 4.15.0 )	2025/11/15	usbl64.tar	19,732,480
System Software	ARM Linux 32 bit BeagleBone Black Rev C (Debian 7/8)	2025/11/15	usbbbb.tar	15,400,960
System Software	ARM Linux 64 bit Raspberry Pi (OS 6.6.51)	2025/11/15	usbrpi.tar	17,254,400
Note: The USBxCH system software supports both USB4CH and USB8CH including drivers, apps, and utilities. Note: Linux software MUST match the bit size of your machine. Linux 32 bit available by request. Note: Linux software also works on many other Ubuntu revs and distros such as Debian. Note: BeagleBone Black single board computer software compiled on Linux 3.8.13-bone47 also works on 4.4.9-ti-r25. Note: The Raspberry Pi software is 64 bit and works with RPi 4 and later hardware. Raspberry Pi 32 bit available by request. Note: If you are upgrading from a pre-2011 version, please remove old custom kernel drivers first.

SER1CH-UA 24 bit low power A/D
Category	Description	Rev	File	# bytes
Product Flyer	SER1CH-UA specs	2012/01/01	flyser1chua.pdf	151,643
User Manual	SER1CH-UA	2008/06/13	manser1chua.pdf	1,019,195
System Software	Windows XP/7	2016/12/20	serwin.zip	4,591,094
System Software	Linux 2.6.21-1.3194.fc7 (Fedora 7)	2008/12/15	serlnx.tar	1,464,320
Note: Utilities and software apps are included.

VREF-399 Test Instrument
Category	Description	Rev	File	# bytes
Product Flyer	Precision voltage reference	2012/01/01	flyvref399.pdf	103,175
User Manual	VREF-399	2010/01/15	manvref399.pdf	678,437
Note: No software is required for the VREF-399. It is a standalone system.

Documents

Papers and App Notes
Category	Description	Rev	File	# bytes
Paper	Scaling and Biasing Analog Signals	2007/11/24	scalebias.pdf	361,490
App Note	Precision sine waves with the DSP32C	2001/06/28	appsine32c.pdf	86,365
Utility	Generic FFT routines in C	1998/09/28	fft.zip	80,805

Component Specs
Product	Description	Rev	File	# bytes
USBxCH	ADS1255 A/D converter by TI	April 2005	ADS1255.pdf	432,155
USBxCH	OPA2277 op-amp by TI	April 2005	OPA2277.pdf	679,538
USBxCH	GPS 16x HVS GPS receiver by Garmin	B, Sep 2008	GPS16xHVS.pdf	605,692
SER1CH-UA	LTC2400 A/D converter by Linear Tech	A, 1998	LTC2400.pdf	473,468
VREF-399	LM399 voltage reference by TI	April 2005	LM399.pdf	668,543
VREF-399	LM399 voltage reference (additional specs)	June 1976	LM399AN161.pdf	180,877
VREF-399	OPA2277 op-amp by TI	April 2005	OPA2277.pdf	679,538
Note: The performance of our products often matches that of the underlying components.