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.
