The NI USB-6343 is a high-performance multifunction I/O device delivering integrated analog input, analog output, digital I/O, and counter/timer capabilities through USB connectivity. Built on National Instruments’ X Series architecture and NI-STC3 timing technology, it provides the synchronization precision and channel density required for data acquisition, automated testing, and control applications. The device supports 32 single-ended or 16 differential analog inputs at 16-bit resolution with 500 kS/s sampling, four 16-bit analog outputs, 48 bidirectional digital I/O channels, and four 32-bit counter/timer channels.
Technical Specifications
Analog Input
• 32 single-ended or 16 differential channels
• 16-bit ADC resolution
• Maximum sample rate: 500 kS/s
• Input impedance (device on): >10 GΩ parallel with 100 pF
• Input impedance (device off): 1,200 Ω
• Input bias current: ±100 pA
• Small signal bandwidth (−3 dB): 1.2 MHz
• Input FIFO buffer: 2,047 samples
• Scan list memory: 4,095 entries
• Overvoltage protection (device on): ±25 V for up to two AI pins
• Overvoltage protection (device off): ±15 V for up to two AI pins
• Input current during overvoltage: ±20 mA maximum per AI pin
• Absolute accuracy (full scale): 2,190 μV with 3 σ coverage factor
Analog Output
• 4 channels, 16-bit DAC resolution
• Maximum update rates: 900 kS/s (1 ch), 840 kS/s (2 ch), 775 kS/s (3 ch), 719 kS/s (4 ch)
• DNL: ±1 LSB
• 16-bit monotonicity guaranteed
• DC output coupling
Digital I/O
• 48 bidirectional channels
• Hardware-timed digital I/O: up to 1 MHz for 32 channels
Counter/Timers
• 4 channels, 32-bit resolution
• Functionality: PWM, encoder, frequency, event counting
Timing & Synchronization
• NI-STC3 timing and synchronization technology
• Independent analog and digital timing engines
– Key Features
• Large channel count supports multi-signal monitoring and control
• >10 GΩ input impedance minimizes loading effects on sensitive sources
• 1.2 MHz small signal bandwidth extends AC measurement capability
• ±25 V transient protection preserves device integrity during overvoltage events
• 2,047-sample input FIFO reduces CPU overhead in streaming applications
• 4,095-entry scan list enables complex acquisition sequences without firmware intervention
– Typical Applications
• Precision data logging and monitoring
• Automated test and measurement systems
• Real-time process control
• Sensor interfacing and signal conditioning
• PWM-based motor and power electronics control
– Compatibility & Integration
USB connectivity enables straightforward integration with standard computers and test benches. NI-STC3 architecture provides timing alignment across analog and digital domains for synchronized multi-channel operations.
