ADLINK DAQ/PXI-2000 series synchronous acquisition card configuration and triggering

Application and Configuration of ADLINK DAQ/PXI-2000 Series Synchronous Multi functional Data Acquisition Card

In automated testing, biomedical signal acquisition, transient measurement, and ATE systems, high-precision, multi-channel synchronous sampling is often the core requirement. The ADLINK DAQ/PXI-2000 series is a high-performance multifunctional data acquisition card based on a 32-bit PCI architecture, providing 4-channel synchronous differential analog input, combined with programmable gain, flexible trigger mode, and bus master DMA (with Scatter/Trainer) capability, suitable for harsh scenarios such as automotive testing, cable inspection, laboratory automation, etc. This series includes four models: DAQ/PXI-2010 (14 bit/2MS/s), 2005 (16 bit/500kS/s), 2006 (16 bit/250kS/s), and 2016 (16 bit/800kS/s). It also provides 2 channels of 12 bit D/A output (1MS/s update rate), 24 programmable digital I/Os, two 16 bit general-purpose timers/counters, as well as a unique 8-bit synchronous digital input (2010 only) and system synchronization interface (SSI), supporting multi card cascade synchronization.

Overview of product series and core selection indicators

The DAQ/PXI-2000 series is positioned as a high-precision synchronous sampling card, with its biggest highlight being the 4-channel fully synchronized differential input, which avoids the phase delay between channels caused by multiplexer switching and is very suitable for applications such as multiphase power measurement, vibration analysis, and transient capture. The core differences are as follows:

Model Resolution Maximum Sampling Rate A/D FIFO Typical Application Scenarios

DAQ/PXI-2010 14 bit 2 MS/s 8K sample high-speed transient and intermediate frequency signal

DAQ/PXI-2016 16 bit 800 kS/s 512 sample high-precision medium speed acquisition

DAQ/PXI-2005 16 bit 500 kS/s 512 sample audio and vibration

DAQ/PXI-2006 16 bit 250 kS/s 512 sample low-power, slowly varying signal

All models support software programmable input ranges (bipolar ± 10V, ± 5V, ± 2.5V, ± 1.25V; unipolar 0~10V, 0~5V, 0~2.5V, 0~1.25V) and gains (x 1, x 2, x 4, x 8). Input impedance 1G Ω//100pF, overvoltage protection with power on ± 30V and power-off ± 15V, suitable for industrial sites. The typical value of system noise is between 0.6 and 2.2 LSB rms (depending on the model and range), and CMRR can reach 85~97dB in the DC~60Hz range, effectively suppressing common mode interference.

The analog output section provides a 2-channel 12 bit DAC (LTC7545 or equivalent) with a maximum update rate of 1MS/s. The output range is bipolar ± 10V or unipolar 0-10V (supports external reference), with an output impedance of 0.3 Ω and a driving current of ± 5mA. It defaults to 0V steady state when powered on. Digital I/O based on 82C55A, 24 line programmable direction, TTL/CMOS compatible. In addition, the 2010 model provides an additional 8 synchronous digital inputs (SDI), which are synchronously latched with analog signals and suitable for mixed signal acquisition.

Key points of hardware installation and signal connection engineering

2.1 Unpacking and Anti static Treatment

The board is a static sensitive device, so it is necessary to operate it on a grounded anti-static pad and wear an anti-static wristband. Check that the packaging includes the board, All in One CD, and software installation guide. If damaged, do not power on.

2.2 PCI/PXI Plug and Play Configuration

The board follows the PCI plug and play specification, and the system BIOS automatically assigns IRQ and I/O addresses without the need for jumper settings. If there is an abnormal startup or unstable operation, it is mostly due to interrupt conflicts. You can check the BIOS settings or try replacing the PCI slot. The PXI version allocates resources through the PXI backplane.

2.3 68 pin VHDCI connector and signal definition

All external signals are connected through a 68 pin VHDCI female socket (AMP-787254-1), and key signals include:

Analog inputs: CHO+~CH3+, CHO -~CH3- (differential pair), reference AIGND;

Analog output: DA0OUT, DA1OUT, refer to AOGND; AOEXTREF is used for external reference;

Trigger signals: EXTATRIG (external analog trigger), EXTDTRIG (AI digital trigger), EXTWFTRIG (AO waveform trigger);

Timer/Counter: SRC, GATE, OUT, UPDOWN for GPTC0/1;

Assistive function input: AFI0 (can be used as external ADCONV or SCAN.START), AFI1 (external DAWR);

The SSI interface (only available in PCI version through 20 pin header) is used for multi card synchronization.

2.4 Analog Input Connection Strategy

Grounding reference signal source (such as non isolated instrument output): It is recommended to use differential connection to connect the signal source ground to AIGND, with the positive terminal connected to CHx+and the negative terminal connected to CHx -, utilizing the common mode rejection capability of the instrumentation amplifier.

Floating ground signal source (such as thermocouple, transformer output): A bias resistor (about 100 times the source impedance) needs to be added between the negative input terminal and AIGND to provide a DC bias circuit; If the source impedance is lower than 100 Ω, the negative terminal can be directly shorted to AIGND.