MC PCI-DAS1602 Bedienungsanleitung PDF herunterladen (Seite 7)

Specifications PCI-DAS1602/16

Counter

*Note: Pins 21, 24, and 25 are pulled to logic high via 10K resistors.

Table 11. Counter specifications

Counter type 82C54

Configuration Two 82C54 chips containing three 16-bit down counters each

82C54A:

Source: ADC Clock.

Gate: Programmable source.

Counter 0 — ADC residual sample

counter.

Output: End-of-Acquisition interrupt.

Source: 10 MHz oscillator

Gate: Tied to Counter 2 gate, programmable source.

Counter 1 — ADC pacer lower

divider

Output: Chained to Counter 2 Clock.

Source: Counter 1 Output.

Gate: Tied to Counter 1 gate, programmable source.

Counter 2 — ADC pacer upper

divider

Output: ADC Pacer clock (if software selected), available at user

connector.

82C54B:

Source: ADC Clock.

Gate: External trigger

Counter 0 — pretrigger mode

Output: End-of-Acquisition interrupt.

Source: User input at 100pin connector or internal 10MHz (software

selectable)

Gate: User input at 100pin connector.

Counter 0 — non-pretrigger mode:

user counter 4

Output: Available at 100pin connector.

Source: 10 MHz oscillator

Gate: Tied to Counter 2 gate, programmable source.

Counter 1 — DAC pacer lower

divider

Output: Chained to Counter 2 Clock.

Source: Counter 1 Output.

Gate: Tied to Counter 1 gate, programmable source.

Counter 2 — DAC pacer upper

divider

Output: DAC Pacer clock, available at user connector.

Clock input frequency 10 MHz max

High pulse width (clock input) 30 ns min

Low pulse width (clock input) 50 ns min

Gate width high 50 ns min

Gate width low 50 ns min

Input high 2.0 volts min, 5.5 volts absolute max

Input low 0.8 volts max, -0.5 volts absolute min

Output high 3.0 volts min @ -2.5 mA

Output low 0.4 volts max @ 2.5 mA

Crystal oscillator frequency 10 MHz

Frequency accuracy 50 ppm

1 2 3 4 5 6 7 8 9 10 11

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