STX104

The STX104 is a 16 channel analog input card with 16-bit resolution. In addition, the STX104 provides 2-channels of analog output with 16-bit resolution. It is designed for use in systems where high reliability is of utmost importance while operating in harsh environments.

Very low noise analog inputs at less than 1.5-LSB RMS over all input ranges (1.1-LSB RMS typical). Noise reduction to 0.6-LSB RMS can be achieved using the jumper selectable sixteen sample moving average filter.

Large one mega-sample FIFO greatly relaxes interrupt latency problems found when using Linux, Windows or other operating systems. Offers more data collection options especially for post-analysis activities.

True 16-bit analog outputs capable of driving up to 50 milli-watt loads.

Software compatibility is important because it immediately offers third party driver support as well as second sourcing. The STX104 is compatible with several other ISA and PC/104 cards including Measurement Computing CIO-DAS1602/16, DAS-1602/16-P5, DAS-16/16jr, PC104-DAS16JR/16, DAC-02 and Keithley DAS-16 Series.

Software Drivers are readily available for VisSim, Labview, Matlab, DAQARTA and Visual Basic environments just to name a few.
Low software overhead interrupt options are available including one interrupt per burst or one interrupt per 512 FIFO samples. Full legacy interrupts (to preserve driver compatibility) are also provided.

PC/104 Data Bus width. Either 8- or 16-bit data paths are possible for the analog inputs and analog outputs. 16-bit data path effectively doubles the PC/104 bandwidth.

Single +5V Supply Operation means reduced power supply and system level complexities.

STX104 Detailed Technical Specifications

Analog Inputs

•Resolution: 16-bits (1/65536 of full scale). No missing codes guaranteed

•Number of Channels: 8 differential or 16 single-ended Inputs.

•Maximum Sampling Rate: 200,000 Samples Per Second

•Input Type: True differential or single-ended, jumper selectable.

•Input Ranges: Unipolar or Bipolar, jumper selectable.

Bipolar: ±10V, ±5V, ±2.5V, ±1.25V.

Unipolar: 0 to 10V, 0 to 5V, 0 to 2.5V, 0 to 1.25V.

•Input Sensitivity: 19 microvolts

•Noise Characteristics: Gaussian behavior with maximum peak-to-peak internal noise of less than 1.5-LSB RMS over all input ranges and operating temperatures (1.2-LSB RMS typical). Jumper selectable 16-point moving average filter drops noise to less than 1-LSB RMS over all input ranges and operating temperatures (0.6-LSB RMS typical).

•DC Drift or Zero Drift: ±2ppm/^oC, ±1.5ppm/^oC typical

•Input Bias Current: 50nA maximum

•Absolute Maximum Input Voltage: ±35V

•Common Mode Voltage Range: ±10V

•Common Mode Rejection Ratio: 70dB at 60Hz

•Integral Linearity Error: ±1.5 LSB (±3 LSB on 1.25V range)

•Differential Linearity: ±1 LSB

•Accuracy: 0.003% of reading, ±1 LSB

•Gain Drift: ±7ppm/°C

•Trigger Sources: Programmable internal 32-bit counter/timer, external source (DI0/TRIG) or software polled. External input will accept GPS PPS output.

•Trigger Modes: Gated pacer, software polled. (Gate must be disabled by software after trigger event)

•Data Transfer: From 1 mega-sample FIFO via interrupt, DMA or software

NOTE: Least Significant Bit (LSB).

Analog Outputs ( Without Analog Outputs, see STX104-ND )

•Resolution: 16 bits

•Number of Channels: 2

•Output Ranges: ±10V, ±5V, 0-5V, 0-10V. Maximum current to 5 milliamps per channel. Each channel independently configurable by jumpers.

•Offset Error: less than 8 LSB

•Gain Error: Adjustable to 0 LSB by potentiometer

•Differential non-linearity: ±1 LSB max

•Settle Time: 10 microseconds

•Integral non-linearity: ±1 LSB max

•Monotonicity Guaranteed

Digital Input/Outputs

•Number of Inputs: 4 TTL compatible

•Input Voltage: Logic 0: 0.0V min, 0.8V max; Logic 1: 2.0V min, 5.5V max

•Input Current: ± 1uA max

•Number of Outputs: 4 TTL compatible

•Output Voltage: Logic 0: 0.0V min, 0.4V max; Logic 1: 2.4V min, 3.3V max.

•Output Current: ±12mA per line max

Counter/Timers

•Analog InputPacer Timer: 32-bit down counter (2 82C54 counters cascaded)

•Clock Source Jumper selectable: 1 MHz or 10 MHz on-board clock source.

•General Purpose: 16-bit down counter: (1 82C54 counter)

•Interrupt/DMA Trigger: End of analog input conversion

General

•Operating temperature range: -40 to +85°C

•Storage temperature range: -55 to +125°C

•Factory Calibration: Full NIST Traceable

•Humidity: 0 to 95% non-condensing

•Power Supply: 5VDC ± 5% at less than 350mA

•Interface: PC/104 8- or 16-bit data paths

Ordering Information

•Part number: STX104-1MFIFO-DAQ

STX104 Recap:

:: STX104 is a PC/104 16-channel, 16 bit A/D with burst mode, 2 D/A, and three 16-bit counter/timers.  This is one of several pc104 analog i/o cards that Apex Embedded Systems offers its customers. 

:: The STX104 analog i/o board operates over extended temperatures from -40^oC to +85^oC.:: All components used on the PC/104 STX104 are designed to operate in the extended and/or mil-spec temperature range under high shock and vibration without up-rating any materials. :: LED read/write indicator

:: Use the REP INSW instruction to read in analog values faster than DMA and with more system control.