Measurement-computing PCI-DAS08 Bedienungsanleitung PDF herunterladen (Seite 15)

Chapter 4

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter Specification

A/D converter type AD1674J

Resolution 12 bits

Ranges ±5 V

A/D pacing Software polled

A/D triggering modes Digital: Software polling of digital input (DIN1) followed by pacer

loading and configuration.

Data transfer Software polled

Polarity Bipolar

Number of channels 8 single-ended

A/D conversion time 10 µs

Throughput 40 kHz typical, PC dependent

Relative accuracy ±1 LSB

Differential linearity error No missing codes guaranteed

Integral linearity error ±1 LSB

Gain drift (A/D specs) ±180 ppm/°C

Zero drift (A/D specs) ±60 ppm/°C

Input leakage current ±60 nA max over temperature

Input impedance 10 MegOhm min

Absolute maximum input voltage ±35 V

Noise distribution (Rate = 1-50 kHz, Average % ± 2 bins, Average % ± 1 bin, Average # bins)

Bipolar (5 V): 100% / 100% / 3 bins

Digital input / output

Table 2. Digital I/O specifications

Parameter Specification

Output: 74ACT273 Digital type (main connector):

Input: 74LS244

Configuration 3 fixed input, 4 fixed output

Number of channels 7

Output high 3.94 volts min @ -24 mA (Vcc = 4.5 V)

Output low 0.36 volts max @ 24 mA (Vcc = 4.5 V)

Input high 2.0 volts min, 7 volts absolute max

Input low 0.8 volts max, -0.5 volts absolute min

Interrupts INTA# - mapped to IRQn via PCI BIOS at boot-time

Interrupt enable Programmable through PCI controller:

0 = disabled

1 = enabled (default)

4-1

1 2 ... 10 11 12 13 14 15 16 17 18 19

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