OMB-DAQ-2408 Series User's Guide
Specifications
29
Max input voltage range
CTR0,CTR1 relative to AGND
and DGND (Note 7)
±20 V max (power on/off)
Input high voltage
1.3 V min, 2.2 V max
Input low voltage
1.5 V max, 0.6 V min
Schmitt trigger hysteresis
0.4 V min, 1.2 V max
Input bandwidth (–3 dB)
1 MHz
Input capacitance
25 pf
Input leakage current
±120 nA@5 V, ±1.6 mA@±15 V
Input frequency
1 MHz, max
High pulse width
500 ns, min
Low pulse width
500 ns, min
Note 7:
DGND pins are recommended for use with counter input pins. The DGND and AGND are common
and are isolated from earth ground.
Memory
Table 21. Memory specifications
EEPROM
4096 bytes isolated micro reserved for sensor configuration
256 bytes USB micro for external application use
Microcontroller
Table 22. Microcontroller specifications
Type
One high-performance 8-bit RISC microcontroller with USB interface (non-isolated)
One high-performance 16-bit RISC microcontroller for measurements (isolated)
Power
Table 23. Power specifications
Parameter
Conditions
Specification
Supply current (Note 8)
Quiescent current
275 mA
Voltage supervisor limits
4.5 V > V
ext
or V
ext
> 5.5 V
PWR LED = Off; (power fault)
4.5 V < V
ext
< 5.5 V
PWR LED = On
+5 V user output voltage range
Available at terminal block pin 40
4.75 V min to 5.25 V max
+5 V user output current
Available at terminal block pin 40
10 mA max
Isolation
Measurement system to PC
500 VDC min
Note 8:
This is the total quiescent current requirement for the OMB-DAQ-2408 Series which includes up to
10 mA for the status LED. This does not include any potential loading of the digital I/O bits, +5 V user
terminal or the AOUTx outputs.
USB specifications
Table 24. USB specifications
Parameter
Specifications
USB device type
USB 2.0 (full-speed)
Device compatibility
USB 1.1, USB 2.0
USB cable type
A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
USB cable length
3 meters max