This card provides 16 single-ended or 8 differential analog channels of 16-bit resolution. An instrumentation amplifier with software programmable gain can be configured for voltage gains of 1, 2, 4 and 8. The A/D conversion can be triggered three ways: software trigger, internal timer pacer and external trigger. The transfer of converted data can also be accomplished in three ways: software polling, interrupt (through ISR), and DMA. All modes can be selected by software.
DC-to-DC Converter
To reduce RFI and EMI noise and assure accuracy on sensitive analog inputs. Analog circuitry is powered from an on-board DC-to-DC converter that provides high noise isolation from the power of the computer system.
D/A Conversion
Two channels of multiplying 12-bit double-buffered analog inputs are provided on the ACL-8216. An on-board -5V internal reference voltage is used to provide analog output in the range 0~5V. With an external AC to DC reference, it can generate outputs 0~5V or 0~10V.
Digital I/O
There are 16 digital inputs and 16 digital outputs allowing the ACL-8216 to interface to a variety of digital signals through two 20-pin dual-in-line connectors.
Timer/Counter
A 3-channel programmable interval timer (8253 or 8254) on-board provides timing for the A/D or can be used to generate frequency outputs at any rate from 2MHz to 0.00046Hz.
Specifications
| Analog Input (A/D) | |
| Input Channel | 16 single-ended or 8 differential |
| Resolution | 16-bit |
| Coding | Sign + magnitude (binary) |
| Input range | Bipolar: ±10V, ±5V, ±2.5V, ±1.25V |
| (software controlled) | Unipolar: 0~10V, 0~5V, 0~2.5V, 0~1.25V |
| Converter | B.B. ADS7805 or equivalent, successive approximation type |
| Conversion time | 8 µsec |
| Overvoltage protection | Continuous ±30V maximum |
| System accuracy | 0.003% of FSR ±1 LSB |
| Input impedance | >10MW |
| Common mode rejection | 80dB (Gain=1) |
| Trigger mode | Software, pacer and external trigger |
| Data transfer | Program control, interrupt, DMA |
| Data throughput | 67KHz (maximum) |
| Analog Output (D/A) | |
| Output channel | 2 double-buffered analog outputs |
| Resolution | 12-bit |
| Output range | Internal reference: 0~5V or 0~10V External reference: max. +10V or -10V |
| Converter | B.B. DAC7541 or equivalent, monolithic multiplex |
| Setting time | 30 µsec |
| Linearity | ±1/2 bit LSB |
| Output driving | ±5mA max. |
| Digital I/O (DIO) | |
| Channel | 16 TTL compatible inputs and outputs |
| Input voltage | Low: min. 0V; max. 0.8V High: min. +2.0V |
| Input load | Low: +0.5V @ -0.2mA max. High: +2.7V @ +20mA max. |
| Output voltage | Low: min. 0V; max. 0.4V High: min. +2.4V |
| Driving capacity | Low: max. +0.5V @ 8.0mA (sink) High: min. 2.7V @ 0.4mA (source) |
| Programmable Counter | |
| Device | 8253/8254 |
| A/D pacer | 32-bit timer (two 16-bit counter cascaded together) with a 2MHz time base |
| Counter | One 16-bit counter with a 2MHz time base |
| Pacer output | 0.00046MHz~0.5MHz |
| General Specifications | |
| I/O base address | 16 consecutive address locations |
| Interrupt IRQ | IRQ3,...IRQ15 |
| DMA channel | CH1 and CH3 |
| Connector | 37-pin female D-type connector |
| Operating temperature | 0°C~50°C |
| Storage temperature | -20°C~80°C |
| Humidity | 5~95%, non-condensing |
| Power consumption | +5V @ 960mA max. |
| Dimensions | 4.85"(W) x 6.25" (L) 124mm(W) x 160mm(L) |
| Cat No. | Description | Price |
| ACL-8216 | High Resolution Multiple Function DAS Card | $449.00 |
©1995 Circuit Specialists, Inc.