The Keithley DAS-1602 is a 12-bit multifunction data acquisition board that integrates analog input, analog output, and digital I/O in a single interface card. It delivers up to 100 kSamples/s throughput with software-selectable input configurations—16 single-ended or 8 differential channels—making it suitable for sensor acquisition and real-time control tasks. The board supports DMA-based data transfer for high-speed applications and maintains backward compatibility with the DAS-16G Series.
## Technical Specifications
**Analog Input**
• Resolution: 12 bits
• Channels: 16 single-ended or 8 differential (software-selectable)
• Maximum sampling rate: 100 kSamples/s
• Conversion time: 8 µs max (7.5 µs typical)
• Acquisition time: 1.4 µs
• Input ranges: ±10 V, 0 to +10 V, ±5 V, ±2.5 V, ±1.25 V, 0 to 5 V, 0 to 2.5 V, 0 to 1.25 V
• Programmable gain: 1, 2, 4, 8
• Input impedance: Greater than 25 MΩ minimum
• Input current: 250 nA maximum at 25°C
• Linearity: ±1 bit
• Accuracy: 0.01% of reading ±1 bit
• Overvoltage protection: ±35 V powered, ±20 V unpowered
• CMRR @ 60 Hz: -100 dB typical, -80 dB minimum
• Gain drift: ±50 ppm/°C maximum of full scale
• Zero drift: ±10 µV/°C ±50 µV/gain (unipolar)
**Analog Output**
• Channels: Two 12-bit D/A channels
• Output ranges: -5 V to +5 V factory-configured; 0 to 5 V, 0 to 10 V, ±5 V, ±10 V with external reference
• Output drive current: ±5 mA maximum
• Settling time: 20 µs to 0.01%
• Output impedance: Less than 0.1 Ω
• Linearity: ±0.5 bit
**Digital I/O**
• Lines: 32 digital I/O
• Configuration: Two 8-bit and two 4-bit banks per 82C55 controller
• Output drive current: ±5 mA maximum
• Logic levels: 2.0 to 5.0 V high, -0.5 to 0.8 V low
## Key Features
• DMA-capable high-speed data transfer
• Guaranteed monotonicity across operating temperature
• Differential and single-ended input modes
• Offset binary (bipolar) and true binary (unipolar) coding
• Backward compatible with DAS-16G Series
## Typical Applications
Multi-channel sensor data logging, process control, real-time monitoring systems, and mixed-signal I/O applications requiring simultaneous analog and digital signal conditioning.
