OMB-DAQ-2416-4AO User's Guide

Specifications

Analog input/output calibration

 

Table 24. Analog input/output calibration specifications

 

 

 

Parameter

 

Specifications

 

 

 

Recommended warm-up time

 

45 minutes minimum

 

 

 

Calibration

 

Firmware calibration

 

 

 

Calibration interval

 

1 year

 

 

 

Calibration reference

 

+10.000 V, ±5 mV maximum. Actual measured values stored in EEPROM

 

 

 

 

 

Tempco: 5 ppm/°C maximum

 

 

Long term stability: 30 ppm/1000 hours

 

 

 

Digital input/output

 

Table 25. Digital input specifications

 

 

Number of I/O

8 channels

 

 

Configuration

Each DIO bit can be independently read from (DIN) or written to (DOUT).

 

The DIN bits can be read at any time whether the DOUT is active or tri-stated.

 

 

Input voltage range

0 to +15 V

 

 

Input type

CMOS (Schmitt trigger)

 

 

Input characteristics

47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor

Maximum input voltage range

0 to +20 V maximum (power on/off, relative to DGND pins 93 and 94)

Pull-up/pull-down

All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block

configuration

default position is pins 1 and 2).

 

Pull down capability is available by placing the JP1 shorting block across pins 2 and 3.

 

 

Transfer rate (software paced)

500 port reads or single bit reads per second typical.

 

 

Input high voltage

1.3 V minimum, 2.2 V maximum

 

 

Input low voltage

1.5 V maximum, 0.6 V minimum

 

 

Schmitt trigger hysteresis

0.4 V minimum, 1.2 V maximum

 

 

Note 2: DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The DGND and GND pins are common and are isolated from earth ground.

 

 

Table 26. Digital output specifications

 

 

Number of I/O

8 channels

Configuration

Each DIO bit can be independently read from (DIN) or written to (DOUT).

 

The DIN bits may be read at any time whether the DOUT is active or tri-stated

 

 

Output characteristics

47 kΩ pull-up, open drain (DMOS transistor)

 

 

Pull-up configuration

All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block

 

default position is pins 1 and 2).

 

 

Transfer rate (software paced)

Digital output – 500 port writes or single-bit writes per second typical.

 

 

Output voltage range

0 to +5 V (no external pull up resistor, internal 47 kΩ pull-up resistors connected to

 

+5 V by default)

 

0 to +15 V maximum (Note 5)

 

 

Drain to source breakdown

+50 V minimum

voltage

 

 

 

 

Off state leakage current

0.1 µA

(Note 6)

 

 

 

 

 

Sink current capability

150 mA maximum (continuous) per output pin

 

150 mA maximum (continuous) for all eight channels

DMOS transistor on-resistance

4 Ω

(drain to source)

 

 

 

 

Note 3: Each DMOS transistor’s source pin is internally connected to GND.

Note 4: DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The DGND and GND pins are common and are isolated from earth ground.

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