Measurement-computing USB-1608HS-2AO Instrukcja Użytkownika Pobierz pdf (Strona 28)

USB-1608HS-2AO User's Guide Specifications

External clock input/output

Table 9. External clock I/O specifications

Parameter

Conditions

Specification

Pin names

SYNC_IN, SYNC_OUT

Pin type

SYNC_IN: Input

SYNC_OUT: Output

Pin descriptions

SYNC_OUT

Outputs A/D pacer clock.

SYNC_IN

Receives A/D pacer clock from external source.

Rising edge sensitive.

Input clock rate

250 kHz maximum.

Clock pulse width

SYNC_IN

1 µs minimum

SYNC_OUT

2 µs minimum

Input leakage current

±2.0 µA

Input high voltage

3.5 V minimum, 6.5 V absolute maximum

Input low voltage

1.5 V maximum, –0.5 V absolute minimum

Output high voltage (Note 6)

IOH = –2.5 mA

3.3 V minimum

No load

3.8 V minimum

Output low voltage (Note 6)

IOL = 2.5 mA

1.1 V maximum

No load

0.6 V maximum

Note 6: SYNC_OUT is over-current protected with a 200 Ω series resistor.

Counter

Table 10. Counter specifications

Pin name (Note 7)

CTR

Counter type

Event counter

Number of channels

Input type

TTL, rising edge triggered

Input source

CTR screw terminal

Resolution

32 bits

Schmidt trigger hysteresis

0.58 V to 0.93 V

Input leakage current

±5 µA

Maximum input frequency

1 MHz

High pulse width

500 ns minimum

Low pulse width

500 ns minimum

Input high voltage

2.4 V minimum, 6.5 V absolute maximum

Input low voltage

2.19 V maximum, –0.5 V absolute minimum

Note 7: CTR is a Schmitt trigger input protected with a 1 kΩ series resistor.

Memory

Table 11. Memory specifications

Data FIFO

65536 samples, 131,072 bytes

EEPROM

512 bytes

1 2 ... 23 24 25 26 27 28 29 30 31 32 33

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