The Keithley DDA-16 is a 16-channel, 12-bit analog output module for ISA-bus systems, delivering precise voltage and current outputs for industrial control, instrumentation, and dynamic calibration tasks. Four quad DAC4815 converters provide guaranteed monotonicity with ±1 bit integral and differential linearity across selectable output ranges of 0–5V, 0–10V, ±2.5V, ±5V, and ±10V, plus 4–20mA current mode. The module settles in <10µs to 0.01% full-scale step and supports programmable update rates from 50 kSamples/s to 0.004 Samples/s, enabling synchronized multi-channel writes and external clock integration. Hardware trigger/gate inputs and programmable output clock signals accommodate system synchronization, while automatic interrupts flag output updates. All channels power up to 0V or 0mA to protect downstream circuitry.
## Technical Specifications
• **Channels:** 16 independent analog outputs via 4 quad DACs
• **Resolution:** 12-bit
• **Linearity:** ±1 bit integral; ±1 bit differential; monotonicity guaranteed
• **Temperature Stability:** 15 ppm full-scale range/°C maximum offset drift
• **Output Ranges:** 0–5V, 0–10V, ±2.5V, ±5V, ±10V, 4–20mA
• **Load Current:** ±15 mA minimum, ±30 mA maximum
• **Output Impedance:** 0.1 Ω typical
• **Settling Time:** <10 µs to 0.01% full-scale step (100 pF typical)
• **Bipolar Output Accuracy:** ±20 mV maximum
• **Update Rate:** 50 kSamples/s to 0.004 Samples/s, programmable via 1 µs–1 s prescaler and 8-bit counter
• **Power Supply:** +5V (320 mA typical, 480 mA max); ±12V (132 mA typical, 185 mA max, no load current)
## Key Features
• Programmable pacer clock with internal (50 kSamples/s to 0.004 Samples/s) or external sources
• Simultaneous multi-channel output updates
• Hardware trigger/gate input for output enable/disable control
• Programmable output clock signal with selectable polarity and delay
• Automatic interrupt generation on output updates
• Safe power-up state: all channels default to 0V or 0mA
## Typical Applications
• Dynamic calibration systems
• X-Y table control
• Strip chart recorder interfacing
• Pressure valve control
• Legacy system modernization
• Specialized industrial control
## Compatibility & Integration
ISA-bus interface via standard 37-pin D-type male connector. 32-bit DriverLINX device drivers provide DLL and ActiveX support for Visual Basic, C/C++, and Delphi. Bundled LabVIEW VIs and compatibility with TestPoint application development enable rapid integration. Startup utility allows board operation within minutes.
