Measurement-computing USB-7202 Manuel d'utilisateur télécharger pdf (Page 21)

USB-7202 User's Guide Specifications

External clock input/output

Table 7. External clock I/O specifications

Parameter Conditions Specification

Pin name SYNC

Pin type Bidirectional

Software-selectable direction Output Outputs internal A/D pacer clock.

Input Receives A/D pacer clock from external source.

Input clock rate 50 kHz, max

Clock pulse width Input 1µs min

Output 5µs min

Input leakage current ±1.0µA

Input high voltage 4.0 V min, 5.5 V absolute max

Input low voltage 1.0 V max, –0.5 V absolute min

Output high voltage (Note 3) IOH = –2.5 mA 3.3 V min

No load 3.8 V min

Output low voltage (Note 3) IOL = 2.5 mA 1.1 V max

No load 0.6 V max

Note 3: SYNC is a Schmitt trigger input and is over-current protected with a 1.5 kΩ series resistor.

Counter

Table 8. Counter specifications

Parameter Specification

Pin name (Note 4) CTR

Counter type Event counter

Number of channels 1

Input type TTL, rising edge triggered

Input source CTR screw terminal

Resolution 32 bits

Schmidt trigger hysteresis

20 mV to 100 mV

Input leakage current ±1µA

Input frequency 1 MHz max

High pulse width 500 ns min

Low pulse width 500 ns min

Input high voltage 4.0 V min, 5.5 V absolute max

Input low voltage 1.0 V max, –0.5 V absolute min

Note 4: CTR is a Schmitt trigger input protected with a 1.5 kΩ series resistor.

Memory

Table 9. Memory specifications

Parameter Specification

Data FIFO 32,768 samples, 65,536 bytes

EEPROM 1,024 bytes

EEPROM configuration

Address range Access Description

0x000-0x1FF Reserved 512 bytes system and Cal data

0x200-0x3FF Read/write 512 bytes user area

1 2 ... 16 17 18 19 20 21 22 23 24 25 26

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Measurement-computing USB-7202 Manuel d'utilisateur Page 21

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