AD8-16
(ADA-8)
Eight-Bit 16-Input A/D and Counter/Timer Card
FEATURES
- 16
Single-ended or 8 differential analog inputs
- Eight-bit
resolution
- Over
16,000 conversions per second
- Programmable
scan rate and voltage ranges
- Two
8-bit analog outputs
- Three
programmable counter/timers
- Eight
digital inputs
- Eight
digital outputs
- +5V
output, 1 amp, fused
FUNCTIONAL
DESCRIPTION
Model
AD8-16 (alternate part number ADA-8) is an economical, multiplexed,
eight-bit Analog-to-Digital Converter (A/D) and Counter-Timer
card for ISA-bus computers. It accepts up to eight differential
or 16 single-ended analog inputs (jumper configured). AD8-16
requires a full-size expansion slot. All connections are made
through a standard 50-pin connector. Base I/O address selection
is via dip switch.
Analog
inputs are multiplexed, amplified, held by a sample and hold
amplifier, and then digitized by an eight-bit A/D converter.
Amplifier gain is selected by software and can differ from
channel to channel.
Full scale voltage ranges are ±128 mV, ±5V,
0-255mV, and 0-10V. When operating in the bipolar ranges,
the digital output is available in 2's complement or offset
binary format. The end-of-conversion signal can be used to
interrupt the computer when configured by jumper. You can
select from IRQ levels 2-7. The interrupt request is automatically
cancelled when the A/D data are read.
There
are two 8-bit Digital-to-Analog converters on this card. These
D/A's output ranges are -10V to +10V and are intended to drive
10 kilohm or greater load. Maximum output current is 5 mA.
Model
AD8-16 also accepts up to eight TTL-level or switch inputs.
High inputs may be from 2.5 to 24 VDC or an "open."
All digital inputs are pulled up to 5 VDC by 1 kilohm resistors
on the card. Low inputs should not exceed 0.8 VDC.
This
card also provides eight discrete digital outputs. Each output
can sink up to 24 mA with zener diode protection at 5.6 VDC.
At system turn-on or reset the digital outputs are tri-stated
and remain so until the computer writes to them. For interface
to your application program, there are also two highly useful
capabilities: Digital Output Read which allows a bit-by-bit
readback of the current digital output byte and Command Readback
which provides readback of the Control Register.
Model
AD8-16 also contains an 8254 timer-counter consisting of
three 16-bit counters. These counters may be loaded and
read by software. You have complete ability to configure
gates, clocks, and outputs either at the I/O connector or
via jumpers on the card. A clock at 1/2, 1/4, 1/8 or 1/16
the computer clock rate is available for counter operation.
Also, the color oscillator frequency can be used. Alternatively,
an external clock may be applied via the I/O connector.
SPECIFICATIONS
Analog
Inputs
- No.
of Channels: Eight differential or 16 single-ended
inputs.
- Voltage
Ranges: Software selectable, ±128 mV or 0-255
mV w/1 mV resolution, ±5V or 0-10V w/39 mV
resolution.
- Overvoltage
Protection: ±40 VDC, single channel.
- Input
Impedance: 10 Megohm
- Accuracy:
±0.4% ±1 count.
- Linearity:
±1 count.
- Resolution:
8 bit binary.
- Temperature
Coefficient: Zero and gain stability each ±1
LSB over full operating temperature range.
- Throughput:
16,600 conversions/second maximum.
Analog
Outputs
- No.
of Channels: 2
- Output
Voltage Range: ±10 VDC.
- Resolution:
8 bit binary.
- Output
Load: 5 mA maximum.
- Accuracy:
±0.4% ±1 bit.
Digital
Inputs
- No.
of Inputs: 8 TTL- and switch-compatible.
- Inputs
pulled up to +5 VDC by 1 Kilohm resistor.
- Logic
Low: 0 to 0.4 VDC.
- Logic
High: 2.4 to 24 VDC.
Digital
Outputs
- No.
of Outputs: 8, TTL/DTL compatible. Outputs are tri-stated
at power on and at reset. Zener diode protected at
5.6 VDC.
- Logic
Low: 0 to 0.4 VDC at 24 mA sink current
- Logic
High: 2.5 to 5.0 VDC at 10 mA source current.
Interrupts
- Level:
Jumper selectable, levels 2-7.
- Enable/Disable:
Interrupt generated by completion of A/D conversion.
Interrupt cancelled when A/D data are read or when
there is a computer write to base address plus 1 (reset
interrupt request).
Counter/Timer
- No.
of Counters: Three independent, 16-bit, fully programmable.
- Clock:
Either internal derived from computer clock (or color
oscillator frequency) divided by 1/2, 1/4, 1/8, or
1/16 or from external clock source.
- Drive
Capability: 5 LSTTL loads. (2.2 mA at 0.45 VDC).
- Input
Load (Gate and Clock): ±10 mA, TTL/CMOS compatible.
- Input
Clock Frequency:10 MHz max.
- Active
Count Edge:Negative edge.
- Clock
Pulse Width: 50 nSec high / 50 nSec low min.
Power
Required
- +5
VDC at 0.5 A.
+12 VDC at 20 mA.
-12 VDC at 20 mA.
Environmental
- Operating
Temperature Range: 0° to 60°C.
- Storage
Temperature Range: -40° to +100°C.
- Humidity:
5% to 90% RH, non-condensing.
Size
-
13.1
inches (333mm), plugs into a "long slot"
in PC
Regulatory
Compliance 
Declaration of Conformity, and Test Reports are on file.
Users must use appropriate shielded cables.
| Part
Number |
Price(USD)
|
| AD8-16 |
224.00
|
View / Download Manual
(in .PDF format)
