Apex Embedded Systems STX104 High-Rel PC/104 Advanced Analog I/O Module

The Apex Embedded Systems STX104 is a high-reliability PC/104 analog I/O module engineered for embedded systems requiring precision data acquisition and control in harsh environments. This COTS solution delivers 16-bit resolution analog input and output with exceptional noise performance, a 1-megasample FIFO buffer, and sophisticated triggering logic - all in a stackable form factor rated -40°C to +85°C. Built without tantalum or electrolytic capacitors to eliminate fire hazards and out-gassing, the STX104 supports transient recording at 200,000 samples per second without CPU interrupts, making it suitable for military, aerospace, and industrial applications demanding long-term system sustainment. Designed and assembled in Wisconsin, USA using ISO 9001 manufacturing protocols.

Technical Specifications Analog Input

16-bit resolution

8/16-channel configuration

Maximum sampling rate: 200,000 samples per second (200 KSPS)

Low-noise performance: <1.5-LSB RMS (1.1-LSB typical); 0.6-LSB RMS achievable via 16-sample moving average filter

Wide programmable input voltage ranges

Low-drift performance Analog Output

Dual 16-bit outputs Buffer & Storage

1-megasample (1M) FIFO buffer eliminates interrupt latency for high-speed transient and burst recording Triggering Subsystem

14 start events, 15 stop events, 12 synchronization events

Selectable delay timer

Three triggering sequence configurations

Key Features

LED status indicator for valid read/write transactions

No tantalum or electrolytic capacitors - fire and out-gassing mitigation

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

High shock and vibration resistance with optional 2mm connectors

Tin mitigation and conformal coating available

Standard 40-pin connector (J7); optional polarized or high-retention 2mm connectors

40-conductor ribbon cables: 7-inch and 18-inch configurations with pull-tab and strain relief

Typical Applications Military, aerospace, and industrial embedded systems requiring sustained operation in demanding thermal and mechanical environments with high-speed transient data capture.

Compatibility & Integration Drop-in replacement for Keithley DAS-16 Series, CIO-DAS1602/16, DAS-16/16jr, PC104-DAS16JR/16, and PC104 legacy systems. Multi-card software compatibility modes support existing drivers and application code.