Measurement Computing / IOtech ADC488/16A A/D Converter with Digital I/O

The Measurement Computing / IOtech ADC488/16A is a 16-bit analog-to-digital converter with integrated 8-bit digital I/O, interfaced via IEEE 488 for scientific and industrial measurement applications. The device converts analog signals at up to 100 kHz sampling rate with 8.1 µs typical conversion time, supporting 16 single-ended or 8 differential input channels across programmable ranges of ±1V, ±2V, ±5V, or ±10V full scale. Its 500 VCM analog input isolation and >70 dB CMRR enable high-fidelity signal capture in noisy environments.

– Technical Specifications

Analog Input Channels: 16 single-ended or 8 differential (expandable via master/slave configuration)

A/D Conversion: 16-bit resolution, 100 kHz sampling rate, 8.1 µs typical conversion time, 96 dB dynamic range, 33 µV/bit sensitivity at ±1V range

Timing Parameters: 1.8 µs typical acquisition time, 25 ns typical aperture time, 0.25 ns typical aperture uncertainty

Signal Bandwidth: Captures repetitive signals to 50 kHz; transient capture capability to 20 µs rise time

Programmable Ranges: ±1V, ±2V, ±5V, ±10V full scale with 500 VCM isolation

Scan Intervals: 10 µs to 50 seconds adjustable

Digital I/O: 8-bit TTL-level inputs and outputs via 20-pin card-edge connector

Memory: 4 Kbyte standard (2 Ksamples); field-installable expansion to 8 Mbytes (4 Msamples)

Data Throughput: 200 Kbytes/s (100,000 16-bit samples/second) continuous to IEEE 488 bus

Triggering: Analog level, external TTL, IEEE 488 GET, or TALK command sources; single-shot or continuous modes

IEEE 488 Compliance: SH1, AH1, T6, TE4, L4, LE4, SR1, PP0, RL0, DC1, DT1, C0, E1; supports up to 13 devices as controller

Power: 105–125 VAC or 210–250 VAC, 50/60 Hz; 20 VA maximum

CMRR: >70 dB DC to 100 Hz

– Key Features

• Field-installable memory modules support extended data logging without host intervention
• FIFO double-buffering enables uninterrupted high-speed continuous acquisition
• Flexible trigger modes accommodate transient capture and synchronized multi-channel measurement
• IEEE 488 bus controller functionality simplifies multi-instrument system integration

– Typical Applications

• Transient waveform acquisition and analysis
• Long-term industrial signal monitoring and data logging
• Multi-channel synchronized measurement in laboratory test systems
• Control integration via simultaneous analog acquisition and digital I/O