Arista Corporation

Introductions:

PCI Bus Plug and Play

The PCI-9812/10 uses PCI controller ASIC to interface with the PCI bus. The ASIC fully implement the PCI local bus specification Rev 2.1. All bus relative configurations, such as base memory address and interrupt assignment, are automatically con-trolled by hardware and PCI BIOS. It does not need user interaction and pre-study for PC configurations. This reduces the burden of searching for conflict-free configurations.

A/D Data Transfer (Bus-mastering)

For high speed data acquisition application, the Bus-mastering DMA (Direct Memory Access) is necessary. The bus mastering DMA is different from the traditional DMA on ISA bus. The bus mastering controller is on the PCI controller that controls the PCI bus as it become the master of the bus. The bus mastering DMA can reduce the using of on-board memory and the PCU loading , it directly transfer data to PC memory therefore increasing the data transfer rates and fully utilize the bandwidth of the PCI bus. Once the analog input operation begins, control returns to your program. The hardware temporarily stores the acquired data in the on-board FIFO and then transfers the data to a user-defined buffer in the host memory.

A/D Signal Conditioning

To control the A/D signal sources, the signal type and range should be considered. The A/D acceptable signal type of PCI-9812/10 is single ended and bipolar, The available signal input ranges for 9812/10 are ?5V or ?1V. The input impedance for the high speed application should also be considered. The available input impedance values are 50 Ohm, 1.25 K, 15M ohm.

A/D Conversion Modes

The conversion mode determines the timing of conversions. There are three sources for A/D conversion timing: internal pacer clock, the external sine wave clock and external square clock. An on-board timer is used for generate the internal A/D pacer clock. The frequency of the pacer is software programmable. The maximum pacer signal rate is 20MHz. While using an external pacer clock, the rising edge of external signal starts an A/D conversion. The conversion rate under this mode is more flexible than the previous mode because the users can handle the external signal with outside device.

A/D Trigger Modes

The PCI-9812/10 provides versatile trigger modes, include-ing internal trigger, external positive-edge trigger and negative-edge trigger. User can use the signals on any analog input channel as the external trigger signal. The post-trigger, pre-trigger, middle trigger and the delay trigger can be implement by combining the software and hardware technics.

Applications

Now, the PCI-9812/9810 has been used on many applications, such as image digitizing for medical applications, vibration testing equipments, video capture analyzers, and IF or baseband signal digitization. This card provides the best performance/cost ratio in the world. The high speed nature and the simple use of this card makes it can be fit into many applications.

Specifications

Analog Input (A/D)

Max. sampling rate: 20 MHz
samples/sec. (Note 1)
Converter: B.B. ADS800 series
Input channels: 4 single-ended
Resolution:
- PCI-9812: 12-bit
- PCI-9810: 10-bit
Input range:
Bipolar: ?1V, or ?5V
(by soldering pads on PCB)
Input impedance: 50 / 1.25K / 15M W
Trigger source: Software trigger,
Analog threshold comparater using internal D/A
to set trigger level, and External digital trigger
Trigger mode: Software-trigger, Pre-trigger,
Post-trigger, Middle-trigger and Delay-trigger
Data transfer mode: DMA (Bus mastering)
Clock source: Internal clock,External digital
clock, external sine wave.
Internal clock frequency: 10 MHz
Accuracy: Gain Error ?1.5%

Digital Input (DIN)

Numbers of channel: 3 TTL compatible inputs
with 10K Ohm. pull down resistor
Input voltage:
Low: Min. 0V; Max. 0.8V
High: Min. +2.0V
Input load:
Low: +0.5V@-0.2mA max..
High: +2.7V min.@20mA max

General Specifications

Connector:
5 BNC for analog input
9-pin header for digital input and trigger input
(An accessary is used to extend the
on-board header to PC back panel.)
Operating temperature: 0?~ 50? C
Storage temperature: -20?~ 80? C
Humidity: 5 ~ 85%, non-condensing
Power consumption: +5 V @ 1.4 A typical
Dimensions: Compact size only 173 mm x 108 mm

Software Support

PCI-9812/10Library &Utility
for DOS library and Windows 95 DLL,
shipped with card.
PCIS-DASK/NT [/98]
are the data acquisition software kits
for Windows NT/98.
DASYLab is a software package
for laboratory automation.
PCIS-LVIEW/95 [/NT] are the LabView drivers
for Win 95/NT.
DAQ-Bench is a 32-bit ActiveX
controls for Windows NT/98.

Order Information

PCI-9812: 4-CH Ultra High Speed 12-bit A/D card

PCI-9810: 4-CH Ultra High Speed 10-bit A/D card