Measurement Computing

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USB-2416 Series

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: 3750 samples per second (S/s), 2000 S/s, 1000 S/s, 500 S/s, 100

S/s, 60 S/s, 50 S/s, 25 S/s, 10 S/s, 5 S/s, 2.5 S/s

Throughput

Single channel: 2.5 Hz to 1102.94 Hz, software-selectable

Multiple channels: 0.16 Hz to 1102.94 Hz, software-selectable

Number of channels: Up to 32 channels individually software configurable as

single-ended or differential; thermocouples require differential mode

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

Channel configurations: Temperature sensor input, software programmable to

match sensor type; voltage input

Input voltage range

Thermocouple mode: ±0.078125 V

Voltage mode: ±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,

±0.15625 V, ±0.078125 V, software configurable

Absolute maximum input voltage: CxH-CxL relative to GND, ±30 V max (power

on), ±10 V max (power off)

Input impedance: 2 GΩ (power on), 390 Ω (power off)

Input leakage current: ±10.6 nA

Input capacitance: 590 pf

Maximum working voltage (signal+common mode):

Voltage mode (±20 V): ±20.01 V max

Voltage mode (all other voltage ranges): ±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

ADC resolution: 24 bits

Crosstalk: Adjacent channels,100 dB

Input Coupling: DC

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

Warm-up time: 45 minutes min

Open thermocouple detect: Enabled when configured for a thermocouple sensor

CJC sensor accuracy: 15 °C to 35 °C, ±0.15 °C typ; 0 °C to 55 °C, ±0.5 °C max

Channel Configurations

Channel

Category

Configuration

CxH/CxL

Thermocouple

16 differential

CxH/CxL

Voltage

Up to 32, individually configurable as either

single ended or differential

Compatible Sensors

Thermocouple Sensor Types

J: –210 °C to 1200 °C

T: –270 °C to 400 °C

K: –270 °C to 1372 °C

N: –270 °C to 1300 °C

R: –50 °C to 1768 °C

E: –270 °C to 1000 °C

S: –50 °C to 1768 °C

B: 0 °C to 1820 °C

Accuracy

Refer to the user’s guide for thermocouple and voltage measurement accuracy tables.

Throughput Rate

The maximum throughput is 1.1 kS/s aggregate. Users can set conversion rates

on a per-channel basis. Refer to the hardware user’s guide for single- and multi-

channel throughput rates.

Analog Voltage Output (USB-2416-4AO only)

Leave unused VDACx channels disconnected. The output voltage defaults to 0 V

when the host PC is reset, shut down or suspended. The duration of the output

transient depends on the enumeration process of the host PC. Typically, the output

of the USB-2416-4AO is stable after two seconds.

Digital to analog converter: DAC8555

Number of channels: 4, 16-bit

Output ranges

Calibrated: ±10 V

Uncalibrated: ±10.05 V, software configurable

Output transient: Host PC is reset, powered on, suspended or a reset command

is issued to device

Duration: 2 s

Amplitude: 2 V p-p

Initial power on

Duration: 50 ms

Amplitude: 5 V peak

Differential non-linearity: ±25 LSB, typ, ±1 LSB max

Output current: VDACx pins, ±3.5 mA max

Output short-circuit protection: VDACx connected to AGND, unlimited duration

Output coupling: DC

VDACx readback: Each output independently measured by the A/D converter,

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

Output noise: 30 µVrms

Settling time: To rated accuracy, 10 V step, 45 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 (±mV): 1.831

Temp drift (%/°C): 0.00055

Absolute accuracy at FS (±mV): 3.661

Relative accuracy

Range: ±10 V

R

elative accuracy (±LSB): 4.0 typical

Digital Input

Number of I/O: 8

Configuration: independently read from (DIN) or written to (DOUT)

Input voltage range: 0 V to 15 V

Input type: CMOS (Schmitt trigger)

Input characteristics: 47 kW pull-up/pull-down resistor, 28 kW series resistor

Maximum input voltage range: 0 V to 20 V max (power on/off, relative to DGND)

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

resistors; pull-down is available with an onboard jumper.

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

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

Digital Output

Number of I/O: 8

Configuration: independently read from (DIN) or written to (DOUT)

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.

Transfer rate (software paced)

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

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: 0.1 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