Measurement Computing

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USB-2408 Series

Specifications

Power on and reset state: DACs cleared to zero-scale, 0 V, ±50 mV

Output noise: 60 µVrms (BW=1.5 KHz)

Settling time: To rated accuracy, 10 V step, 75 µs

Slew rate: 1.0 V/µs

Throughput

Single-channel: 1000 S/s max, system-dependent

Multi-channel: 1000 S/s /#ch max, system-dependent

Calibrated absolute accuracy

Range: ±10 V

Accuracy (±LSB): 16.0

Calibrated absolute accuracy components

Range: ±10 V

% of Reading: ±0.0183

Offset: ±1.831 mV

Temp drift (%/°C): 0.00055

Absolute accuracy at FS: ±3.661 mV

Relative accuracy

Range: ±10 V

Relative accuracy: ±4.0 LSB typ

Analog Input/Output Calibration

Warm-up time: 45 minutes min

Calibration: Firmware calibration

Calibration interval: 1 year

AI calibration reference: 10.000 V, ±5 mV max; measured values stored in EEPROM

Tempco: 5 ppm/°C max

Long-term stability: 30 ppm/1000 hours

AO calibration procedure (USB-2408-2AO only): The analog output pin is

internally routed to the analog input pin.

AOUTx readback (USB-2408-2AO only, software-selectable): Each AOUTx output

can be independently measured by the onboard A/D converter

Digital Input/Output

Digital Input

Number of I/O: 8 channels

Configuration: Each DIO bit can be independently read from (DIN) or written to

(DOUT). 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 V to 20 V max (power on/off, relative to DGND

Pull-up/down configuration: All pins pulled up to 5 V through individual 47 kΩ

resistors. Configure for pull-down with J6 shorting block across pins 2 and 3

Transfer rate (software paced): 500 port reads or single bit reads per second typ

Input high voltage: 1.3 V to 2.2 V

Input low voltage: 1.5 V to 0.6 V

Schmitt trigger hysteresis: 0.4 V to 1.2

Digital Output

Number of I/O: 8 channels

Configuration: Each DIO bit can be independently read from (DIN) or written to

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

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

Each DMOS transistor source pin is internally connected to DGND

Pull-up configuration: All pins pulled up to 5 V through individual 47 kΩ resis-

tors (the J6 shorting block default position is pins 1 and 2).

Transfer rate (software paced)

Digital output: 500 port writes or single bit writes per second typ

Output voltage range: 0 V to 5 V (no external pull up resistor, internal 47 kΩ

pull-up resistors connected to 5 V by default); 0 V to 15 V max

Drain to source breakdown voltage: 50 V min

Off state leakage current: 1.0 µA

Sink current capability: 150 mA max (continuous) per output pin

150 mA max (continuous) for all eight channels

DMOS transistor on-resistance (drain to source): 4 Ω

Counter

Pin names: CTR0, CTR1

Number of channels: 2

Resolution: 32-bits

Counter type: Event counter

Input type: Schmitt trigger, rising edge triggered

Input source: CTR0 (pin 44), CTR1 (pin 42)

Counter read/writes rates (software paced)

Counter read: System-dependent, 500 reads per second.

Counter write: System-dependent, 500 writes per second.

Input characteristics: Each CTRx input pin has 562 kΩ resistor pulled up to 5 V

and a 10 kΩ series resistor

Input voltage range: ±15 V max

Maximum input voltage range: CTR0,CTR1 relative to GND and DGND, ±20

V max (power on/off)

Input high voltage: 1.3 V to 2.2 V

Input low voltage: 1.5 V to 0.6 V

Schmitt trigger hysteresis: 0.4 V to 1.2

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

Memory

EEPROM: 4096 bytes isolated micro reserved for sensor configuration, 256 bytes

USB micro for external application use

Microcontroller

Type: One high-performance 8-bit RISC microcontroller with USB interface

(non-isolated)

One high-performance 16-bit RISC microcontroller for measurements (isolated)

Power

Supply current: Quiescent current, 275 mA

This is the total quiescent current requirement for the USB-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.

Voltage supervisor limits: 4.5 V > V

ext or Vext > 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 to 5.25 V

+5 V user output current: Available at terminal block pin 40, 10 mA max

Isolation: Measurement system to computer, 500 VDC min

USB 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 m (9.84 ft) max

Environmental

Operating temperature range: 0 °C to 50 °C

Storage temperature range: -40 °C to 85 °C

Humidity: 0% to 90% non-condensing

Mechanical

Dimensions (L × W × H): 127 × 89.9 × 35.6 mm (5.00 × 3.53 × 1.40 in.)

User connection length: 3 m (9.84 ft) max

Screw Terminal Connector

Connector type: Fixed screw terminal

Wire gauge range: 16 AWG to 30 AWG