NI AT-MIO-16H-25 Multifunction I/O Board

The NI AT-MIO-16H-25 is a high-performance multifunction I/O board for data acquisition and control in laboratory test and measurement applications. This PC/AT bus card integrates 16 analog input channels (configurable as 8 differential), 2 analog outputs, and 24 bidirectional digital I/O lines. The board delivers up to 100 kS/s sampling with 12-bit resolution, 9 microsecond conversion time, and high-speed analog settling. Onboard timing resources include 3 counter/timers and 1 frequency output channel. The AT-MIO-16H-25 supports direct measurement of strain gauges, thermocouples, RTDs, and voltage/current sources through programmable gain (1, 2, 4, 8) and overvoltage protection (±15 V power off, ±25 V power on for analog inputs). Dual-channel DMA and FIFOs enable sustained high-speed data transfers. Real-Time-System-Integration (RTSI) bus synchronizes multi-card systems. SCXI module interfacing allows expanded channel counts and signal conditioning. The board integrates with NI-DAQ drivers and graphical programming environments including LabVIEW and LabWindows.

– Technical Specifications

Analog Input
• 16 single-ended or 8 differential channels (software-selectable)
• 12-bit resolution
• Up to 100 kS/s sampling rate
• 9 microsecond conversion time
• Programmable gain: 1, 2, 4, 8
• ±11 V common-mode input range (referenced to AIGND)
• ±1.5 LSB maximum relative accuracy over temperature
• ±0.5 LSB typical differential nonlinearity
• 105 dB common-mode rejection ratio
• DC to 255 kHz bandwidth (-3 dB)
• 100 GΩ parallel with 100 pF input impedance
• ±25 V overvoltage protection (power on); ±15 V (power off)

Analog Output
• 2 output channels
• 16-bit multiplying DAC
• 100 kS/s maximum update rate
• ±4 LSB maximum relative accuracy (nonlinearity)
• ±0.5 LSB maximum differential nonlinearity
• ±25 V overvoltage protection per channel

Digital I/O
• 24 bidirectional channels, TTL-compatible (5 V logic)
• 2.6 mA source capability at 2.4 V minimum
• High-impedance power-on state

Timing
• 3 counter/timers
• 1 frequency output channel

– Key Features

• High-speed analog settling with 9 µs conversion time
• Dual-channel DMA and FIFO buffering for continuous acquisition
• RTSI bus for multi-board synchronization
• SCXI module compatibility for signal conditioning and expansion
• Overvoltage protection on all analog channels
• Direct signal support for strain gauges, thermocouples, RTDs, and analog sources

– Typical Applications

• Laboratory data acquisition and measurement
• Real-time control systems
• Multipoint strain and temperature monitoring
• Industrial automation and process monitoring
• Waveform generation and signal conditioning

– Compatibility & Integration

• PC/AT bus interface
• NI-DAQ driver support
• LabVIEW and LabWindows programming environments
• RTSI bus integration for time-synchronized multi-card systems
• SCXI system interfacing