IOtech ADC488/16A

The IOtech ADC488/16A is a 16-bit analog-to-digital converter engineered for high-resolution data acquisition across demanding measurement applications. This IEEE-488 interfaced instrument delivers up to 100 kHz sampling at 16-bit resolution with programmable input ranges (±1 V, ±2 V, ±5 V, ±10 V FS) and 96 dB dynamic range. With 500 VCM isolation, 33 µV/bit sensitivity at ±1 V range, and 1.8 µs acquisition time, it captures subtle signal variations without frequent gain adjustments. The device supports 16 single-ended or 8 differential input channels, eight TTL digital I/O lines, and flexible triggering from analog level, external TTL, or IEEE-488 commands. Configurable memory from 4 Kbytes to 8 Mbytes enables local buffering or FIFO operation to the GPIB bus at 200 Kbytes/s throughput. Temperature coefficient of (±0.002% ±100 µV)/°C and 25 ns aperture time ensure measurement stability. Transient capture capability down to 20 µs and programmable scan intervals from 10 µs to 50 seconds make it suitable for both repetitive and single-shot acquisitions. Master/slave expansion supports up to four slave units for increased channel capacity.

Technical Specifications

Resolution: 16-bit

Input Channels: 16 single-ended or 8 differential

Sampling Rate: Up to 100 kHz

Input Ranges: ±1 V, ±2 V, ±5 V, ±10 V FS (programmable)

Sensitivity: 33 µV/bit (±1 V range)

Dynamic Range: 96 dB

Analog Input Isolation: 500 VCM

Maximum Input: 25 V p-p

Acquisition Time: 1.8 µs typical

Aperture Time: 25 ns typical

Conversion Time: 8.1 µs typical

Temperature Coefficient: (±0.002% ±100 µV)/°C

Throughput: 200 Kbytes/s to IEEE 488 bus

Internal Memory: 4 Kbytes standard; up to 8 Mbytes optional

Digital I/O: Eight TTL inputs, eight TTL outputs

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

Operating Temperature: 0°C to 50°C

Operating Humidity: 0% to 95% RH, non-condensing to 35°C

Key Features

Programmable gain and input range selection

Pre-trigger storage up to 100% of available memory

Trigger delay up to 8,000 scans

Scan intervals from 10 µs to 50 seconds

Transient capture as fast as 20 µs

Bandwidth for 50 kHz repetitive signals

Double-buffering FIFO support

Master/slave expandability to four slave units

ASCII command programming

Interfaces & Integration

IEEE-488 (GPIB) compliant (SH1, AH1, T6, TE0, L4, LE0, SR1, PP1, RL0, DC1, DT1, C0)

Analog level, external TTL, Group Execute Trigger (GET), and TALK command triggering

Single-shot and continuous acquisition modes