ADLINK DAQ-2000 Synchronous Sampling and Acquisition Card Selection Guide

ADLINK DAQ-2000 Series Synchronous Sampling Multifunctional Data Acquisition Card Selection and Application Guide

In demanding applications such as excitation response testing, multi-channel sensor signal synchronization acquisition, and vibration and acoustic analysis, phase consistency between channels is crucial. Traditional multiplex scanning ADCs introduce time offset due to channel switching, which cannot meet the requirements of high-precision time-domain or frequency-domain analysis. The ADLINK DAQ-2000 series is a synchronous sampling multifunctional DAQ card designed specifically for such scenarios, providing 4-channel differential analog inputs, each channel equipped with an independent ADC, achieving true simultaneous sampling, with a maximum sampling rate of 2 MS/s (14 bits) or 800 kS/s (16 bits). Combined with 2-channel 12 bit analog output, 24 channel digital I/O, 2-channel 16 bit timer/counter, as well as flexible analog/digital triggering and SSI system synchronization bus, this series of products has become an ideal platform for multi-channel stimulation/response testing, audio analysis, radar signal acquisition and other applications. This article will provide engineers with complete technical references from the aspects of architecture characteristics, model selection, analog input/output specifications, synchronous expansion, software development, and deployment points.

Product Family and Selection Comparison

The DAQ-2000 series includes four models, with the core difference being the sampling rate and resolution, to meet different precision and speed requirements:

Model resolution, highest sampling rate (per channel), applicable scenarios

DAQ-2010 14 bit 2 MS/s high-speed transient signal acquisition (such as shock, explosion, radar pulse)

DAQ-2016 16 bit 800 kS/s high-precision audio and vibration analysis, balancing speed and dynamic range

DAQ-2005 16 bit 500 kS/s universal vibration, strain, and temperature (thermocouple) measurement

DAQ-2006 16 bit 250 kS/s slow process monitoring, such as pressure, flow, and voltage trend recording

All models offer:

4-channel differential input, with an input range of ± 1.25V to ± 10V (bipolar) or 0~1.25V to 0~10V (unipolar), and supports programmable gains of x 1, x 2, x 4, x 8.

2-channel 12 bit analog output, with a maximum update rate of 1 MS/s and an output range of ± 10V or 0-10V (optional external reference).

24 channel TTL digital I/O (based on 8255 programmable peripheral interface, configurable as input/output/bidirectional port).

2-channel 16 bit universal timer/counter, with a base frequency of 40 MHz, supporting external clock (up to 10 MHz).

Analog and digital triggering, supporting pre triggering, post triggering, mid triggering, delayed triggering, and repeated triggering modes.

SSI (System Synchronization Interface) bus, used for multi card synchronous cascading and expanding the number of channels.

Fully automatic calibration, no need to manually adjust potentiometer, built-in ± 2 ppm/℃ temperature drift reference source.

Analog Input Front End Details

2.1 Differential Input and Anti Noise Capability

Each channel is a differential input with an input impedance of up to 1 G Ω | | 100 pF, which has minimal impact on the signal source. The typical value of Common Mode Rejection Ratio (CMRR) at gain=1 is 85 dB, which can effectively suppress ground loop and common mode interference. In terms of overvoltage protection, it can withstand ± 35V continuously without damage when powered on, and ± 15V when powered off, enhancing the fault tolerance of on-site wiring.

2.2 Input Range and Gain Combination

Through software programming, the range and gain of each channel can be independently set:

Bipolar: ± 10V, ± 5V, ± 2.5V, ± 1.25V;

Monopolar: 0~10V, 0~5V, 0~2.5V, 0~1.25V.

Gain of x 1, x 2, x 4, x 8, when combined with full range, can achieve smaller ranges (such as when ± 10V/8=± 1.25V, the resolution is correspondingly improved). For DAQ-2016/05/2006, the LSB of 16 bit resolution at ± 10V range is approximately 0.3mV (gain=1), which meets the requirements for most sensors to be directly connected.

2.3 Sampling rate and FIFO

DAQ-2010: Equipped with 8K sampling point FIFO, supports high-speed continuous acquisition, and reduces the risk of data overflow.

Other models: The FIFO has 512 sampling points, but data can be directly transferred to the system memory through Scatter Gate DMA, breaking the size limit of FIFO and achieving long-term continuous recording.

2.4 Trigger and Acquisition Modes

Supports multiple triggering sources (software, external digital/analog signals, SSI bus triggering) and provides flexible acquisition modes:

Pre trigger: Collect a specified amount of data before triggering (suitable for capturing the pre event state);

Post trigger: Collect data after triggering (most commonly);

Mid trigger: Simultaneously collect a segment of data before and after the trigger;

Delay triggering: Wait for a specified delay after triggering before collecting;

Repeated triggering: After a single trigger, repeat the collection multiple times, suitable for periodic signals.

Analog output and waveform generation