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Features
- Up to 16 Analog Output Channels
- Optional 32-Bit Digital Output
- 50K Samples/Second, Maximum Channel Update Rate
- Programmable Analog Output Ranges
- 12-Bit DAC Resolution
- Operating Systems
Introduction
The PDAC-UXX is a USB device hosted in a PCI form factor. The PCI-USB-based Digital-to-Analog Converter module is a breakthrough in programmable analog output boards used with commercial bus architectures. The PDAC board solves the critical data through-put problem of real-time processing systems in which PCI-based analog output modules are rate-constrained by operating system software such as Windows.
Most modules that need to maintain accurate data-driven, real-time coherency for derived, EU, and raw parameters are limited in two ways: they must use single transfers over the USB bus, and they are limited to the maximum rate handled by operating system timers (approximately 1 kHz for Windows).
Receiving both data and time tags over the USB bus from OMEGA Windows® software, the PDAC board features independent, on-board timers to accurately correlate analog, and discrete outputs at their correct real-time rate. The PDAC module supports raw, EU, derived, and user-defined parameters in a data-driven manner.
As with all boards in our Series-3000 systems, the PDAC module uses plug-n-play technology. It occupies a half-length PCI card slot and may be installed in any compatible factory or customer-provided processing platform.
| Input Signals |
| Input Data |
USB data, 16-bit words |
| DAC Input Data Word Format |
12 bits data + 4 bits channel address Bipolar: 4095 = full scale +, 2048 = 0V, 0 = full scale – |
| DAC Input Data Rate |
1K – 25K samples/second/channel; data driven tracking |
| Number of DAC Channels |
16 channels standard |
| Discrete Data |
16-bit register |
| Discrete Output Data Format |
16 bits TTL |
| Discrete Data Rate |
25K samples/second/channel maximum |
| Sinewave Reference Clock Input |
| Frequency |
1 kHz, 10 kHz, 100 kHz, 1 MHz – 50 MHz |
| Signal Type |
Single-ended sine wave |
| Levels |
1V – 8V peak-to-peak |
| DC Offset |
DC Offset < 10 percent of volts peak-to-peak level centered around ground |
| Input Impedance |
50 ohms, 75 ohms, 10K ohms (programmable) |
| SNR |
≥ 50 dB |
| RS-422/TTL Reference Clock Input |
| Frequency |
1 kHz, 10 kHz, 100 kHz, 1 MHz – 50 MHz |
| Signal Type |
RS-422, TTL, LVTTL (3.3V) |
| Performance |
| Number of DAC Channels |
16 |
| DAC Resolution |
12 bits |
| DAC Rate |
25,000 samples/second(maximum)/channel |
| DAC Output Voltage Range |
+5V to - 5V |
| DAC Relative Accuracy |
± 2 LSB – (typical) + gain error + bipolar output accuracy |
| DAC Linearity |
± 0.005 percent of FSR (maximum) |
| DAC Gain Error |
+/- 0.3 percent (typical) |
| DAC Bipolar Output Accuracy |
± .8 percent of FSR |
| DAC Bipolar Offset Error |
± .2 percent of FSR |
| Output |
| DAC Output Current |
Maximum 0.5 mA/channel – 10 Kohm load |
| Discrete Output Current |
Synchronous buffer 1 mA/channel |
| Data Latency |
50 ms < BOARD_LATENCY < 200 ms (with software suport) +/-15 percent of BOARD_LATENCY data rate tracking |
| Electrical and Environmental |
| Form Factor |
1/2 size PCI card |
| Operating Temperature |
0° to 50 °C |
| Operating Humidity |
20 to 95 percent noncondensing |
| Storage Temperature |
-20° to 80 °C (storage) |
| Storage Humidity |
20 to 95 percent noncondensing |
| Power |
+3.3V from PCI backplane. Total Power dissipation < 3W. |
| Status |
LED indication of Board ID # and operational status |
| Connectors |
44-pin D edge connector for analog outputs and inputs.
40-pin, ribbon cable header for discrete outputs. |
| Programming |
Programming via USB bus |
| Ordering Codes |
| PDAC-U16 |
Integrated DAC/Discrete Output, 16 Channels |
| PDAC-UXX-002 |
PDAC Option: 16-Channel Digital/Discrete Output |
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| All specifications subject to change without notice. |
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Revision Date: Aug08 |
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Tel 301.737.1555 |
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Fax 301.737.1564 |
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