ADLINK DAQ-2500 Series Multi Channel Analog Output Card

Although analog output is the main feature, the 2500 series is still equipped with considerable analog input capability, making it easy for the system to simultaneously obtain response signals and achieve closed-loop or monitoring.

3.1 Number of Channels and Resolution

2501: 8-channel single ended input.

2502:4 channel single ended input.

Resolution: 14 bits, no missing codes.

Maximum sampling rate: 400 kS/s (shared by all channels, but can be multiplexed).

3.2 Input Range and Front End Characteristics

Bipolar: ± 10 V; Monopolar: 0~10 V (programmable).

Gain: Fixed at 1 (without programmable gain amplifier).

Input coupling: DC coupling.

-3 dB bandwidth: 600 kHz (± 10V range), sufficient to capture signal harmonics at a sampling rate of 400 kS/s.

Overvoltage protection: ± 30 V for power on, ± 15 V for power off, input impedance up to 1 G Ω//6 pF, with minimal impact on the tested circuit.

3.3 Trigger and FIFO

Analog input supports trigger modes similar to output, and is equipped with a 2k sampling point A/D FIFO on board. It supports scattering aggregation DMA to ensure that high-speed data streams do not lose points. This enables the 2500 series to synchronously collect response signals while outputting excitation signals, forming a complete frequency response analysis (FRA) or impedance measurement system.

Digital I/O and Timer/Counter

4.1 24 channel programmable DIO

Based on the 8255 compatible architecture, it is divided into three 8-bit ports and supports 5V TTL level. Input/output directions can be configured through software for controlling external relays, reading status indicators, or implementing simple handshake protocols. The data transmission method is program I/O, suitable for low-speed control tasks.

4.2 Dual channel 16 bit universal timer/counter

Reference clock: 40 MHz internal clock, while supporting up to 10 MHz external clock input.

Resolution: 16 bits.

Purpose: It can be used for pulse counting, frequency measurement, PWM generation, or as an additional sampling clock source, providing a flexible time reference for the system.

Bus interface and multi card synchronization mechanism

5.1 Three bus forms

DAQ-2500 series: 32-bit 3.3V/5V compatible with PCI bus, suitable for traditional industrial control computers.

DAQe-2500 series: PCI Express x1 interface, providing higher bandwidth and low latency, suitable for modern compact computers.

PXI-2500 series: Complies with PXI specification Rev 2.2, dimensions 160mm x 100mm, supports PXI backplane triggering and star triggering, suitable for chassis modular systems.

5.2 Multi card synchronization solution

When more channels are needed (such as 16 or 32 synchronous analog outputs), there are two ways to achieve this:

SSI (System Synchronization Interface) bus: Multiple cards are connected using dedicated cables (ACL-SSI-2/3/4) to achieve daisy chain or star distribution of clock and trigger signals, with synchronization deviation in nanoseconds.

PXI Trigger Bus (PXI models only): Utilizing backplane trigger lines to achieve multi module synchronization.

After synchronization, the analog output channels of all cards can be considered as a whole and updated simultaneously under the same startup signal, perfectly supporting applications such as multiphase motor drive and beamforming.

Automatic calibration and long-term stability

Onboard+5V high stability reference source (temperature drift ± 2 ppm/° C, long-term stability ± 6 ppm/1000 hours) combined with automatic calibration circuit, can perform gain and offset self calibration through software commands without the need for an external standard source. This greatly simplifies regular metering operations, ensuring that the equipment can maintain factory accuracy even after years of use.

Software Ecology and Development Support

7.1 Operating System Compatibility

Supports Windows 7/Vista/XP/2000/2003 Server and Linux, ensuring compatibility with mainstream development environments.

7.2 Drivers and Development Tools

D2K-DASK (Windows) and D2K-DASK/X (Linux): Low level driver libraries that provide rich APIs and support languages such as VB.net, VC.net, VB, VC++, BCB, Delphi, etc.

DAQPilot: LabVIEW specific driver that accelerates graphical programming.

DAQ-MTLB: MATLAB interface, convenient for researchers to quickly verify algorithms.

Upper level application software such as AD Loger and DAQBench support fast testing without programming.

Especially for arbitrary waveform generation, the driver library provides advanced functions. Users only need to input the waveform array and the number of repetitions, and the hardware can automatically complete the loop output.

Key points of attachment and system integration

8.1 Standard attachments

DIN-68S-01: 68 pin SCSI-II terminal board, supports DIN rail installation, convenient for on-site wiring.

ACL-10568-1:1 meter long 68 pin SCSI-VHDCI shielded cable (compatible with AMP 787082-7 connector), used for connecting terminal boards or directly to the device under test.

8.2 Precautions for External Reference and Trigger Connection

The manual specifically states that the external reference input (AOEXTREF) and the external analog trigger signal share analog input pins 5, 7, and 8. Therefore, when it is necessary to use both external references and external triggers simultaneously, it is important to carefully plan pin assignments to avoid conflicts. It is recommended to prioritize using PXI triggering or digital triggering to reduce the occupation of analog input channels.