Measurement Computing

(508) 946-5100

3

info@mccdaq.com

mccdaq.com

USB-2408 Series

Mux

Microcontroller

and

FPGA

24-bit

A/D

PGA

8

8

Bitwise

Programmable

DIO

SPI

8

AI

AI

Counter In 1

Counter In 0

USB-2408-2AO only

16-bit

D/A

16-bit

D/A

Amp

Amp

SPI

SPI

Isolation

Calibration

Voltage

Sources

2

D+/D–

Non-Isolated

Power

Supply

VBUS (5 V)

EEPROM

Microcontroller

with full-speed

USB 2.0

Isolated

Power

Supplies

+12.0 V–12.0 V 3.3 V5 V

3.3 V

USB

USB-2408 Series Block Diagram

Specifications

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

All specifications apply to all temperature and voltage input channels unless

otherwise specified.

Analog Input

A/D converter type: ADS1256, 24-bit Sigma Delta

A/D data rates (S/s): 3750, 2000, 1000, 500, 100, 60, 50, 25, 10, 5, 2.5

A/D resolution: 24 bits

Throughput

Single channel: 2.5 S/s to 1102.94 S/s

Multiple channels: 0.16 Hz to 1102.94 Hz

Number of channels: Up to 16 channels individually software-selectable SE/ DIFF

Input isolation: 500 VDC min between field wiring and USB interface

Channel configurations: Temperature sensor input, voltage input

Input voltage range

Thermocouple mode (V): ±0.078125

Voltage mode (V): ±10, ±5, ±2.5, ±1.25, ±0.625, ±0.3125, ±0.15625, ±0.078125

Absolute maximum input voltage

CxH-CxL relative to GND: ±22 V max (power on), ±10 V max (power off)

Input impedance: 10 MΩ (power on), 390 Ω (power off)

Input leakage current: ±20 nA; voltage >±22 V (power on/off): ±1 µA max

Input capacitance: 590 pf

Working voltage (signal + common mode): Voltage mode ±10.25 V max

Common mode rejection ratio

Thermocouple mode (f

IN = 60 Hz): 110 dB

Voltage mode (f

IN = 60 Hz, all input ranges): 90 dB

Crosstalk: adjacent channels,100 dB

Input coupling: DC

Channel gain queue: Up to 64 elements, software-selectable channel and range

Warm-up time: 45 minutes min

Open thermocouple detect: Software-selectable for each channel

CJC sensor accuracy

15 °C to 35 °C: ±0.5 °C typ

0 °C to 55 °C: ±1.0 °C max

Channel Configurations

CxH/CxL

Thermocouple: 8 DIFF channels

Voltage: 16 SE or 8 DIFF; individually configurable

Compatible Sensors (Thermocouple)

J: –210 °C to 1200 °C

K: –270 °C to 1372 °C

R: –50 °C to 1768 °C

S: –50 °C to 1768 °C

T: –270 °C to 400 °C

N: –270 °C to 1300 °C

E: –270 °C to 1000 °C

B: 0 °C to 1820 °C