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USB-1208FS-Plus/LS/1408FS-Plus Series

Specifications

Specifications

All specifications are subject to change without notice.

Typical for 25°C unless otherwise specified.

USB-1208FS-Plus and USB-1408FS-Plus

These specifications apply to both standard and OEM versions unless noted

otherwise.

Analog Input

A/D converter type: Successive approximation

Channels: 8 SE or 4 DIFF, programmable as SE or DIFF

Input common-mode voltage range for linear operation

SE Mode: CHx to GND, ±10 V max

DIFF Mode: CHx to GND, –10 V min, 20 V max

Absolute maximum input voltage: CHx to GND, ±28 V max

Input impedance: 122 kΩ

Input current

Input current is a function of applied voltage on the analog input channels. For

a given input voltage, Vin, the input leakage is approximately equal to (8.181

* Vin–12) µA

Vin = 10 V, 70 µA typ

Vin = 0 V, –12 µA typ

Vin = –10 V, –94 µA typ

Ranges: Software or selectable on a per-channel basis

SE mode: ±10 V

DIFF mode: ±20 V, ±10 V, ±5 V, ±4 V, ±2.5 V, ±2.0 V, ±1.25 V, ±1.0 V

Throughput

Maximum throughput scanning to computer memory depends on the

computer being used.

USB-1208FS-Plus

Software paced: 250 S/s typ, system-dependent

Hardware paced: 50 kS/s

USB-1408FS-Plus

Software paced: 250 S/s typ, system-dependent

Hardware paced: 48 kS/s

Channel gain queue: Up to 8 elements, software-selectable channel and range

Resolution

USB-1208FS-Plus

DIFF: 12 bits, no missing codes

SE: 11 bits (the AD7870 converter only returns 11-bits (0–2047 codes) in

SE mode)

USB-1408FS-Plus

DIFF: 14 bits, no missing codes

SE: 13 bits (the AD7871 converter only returns 13-bits (0–8192 codes) in

SE mode)

Integral linearity error

USB-1208FS-Plus: ±1 least significant bit (LSB) typ

USB-1408FS-Plus: ±2 LSB typ

Differential linearity error: ±0.5 LSB typ

Repeatability: ±1 LSB typ

Absolute accuracy long term drift (USB-1408FS-Plus only)

Extrapolating the long term drift accuracy specifications provides the approxi-

mate long term drift of the

USB-1408FS-Plus intermediate input ranges.

±20 V range: ±3 LSB typ (

Δt = 1000 hrs)

±4 V range: ±6 LSB typ (

Δt = 1000 hrs)

±1 V range: ±8 LSB typ (

Δt = 1000 hrs)

2.5VREF output current (USB-1408FS-Plus only)

Source: 5 mA max

Sink: 20 µA min, 100 µA typ

Trigger source (software-selectable)

External digital: TRIG_IN

Clock source (software-selectable)

Internal

External (SYNC), Rising Edge Triggered

Analog Input Accuracy

USB-1208FS-Plus

Range

Accuracy (LSB)

Differential Mode

±20 V

5.1

±10 V

6.1

±5 V

8.1

±4 V

9.1

±2.5 V

12.1

±2 V

14.1

±1.25 V

20.1

±1 V

24.1

Single-Ended Mode

±10 V

4.0

Analog Input Accuracy

USB-1408FS-Plus

Range

Absolute Accuracy

25°C

Absolute Accuracy

0 to 50°C

Differential Mode

±20 V

±10.98 mV

±49.08 mV

±10 V

±7.32 mV

±33.42 mV

±5 V

±3.66 mV

±20.76 mV

±4 V

±2.92 mV

±19.02 mV

±2.5 V

±1.83 mV

±14.97 mV

±2 V

±1.70 mV

±14.29 mV

±1.25 V

±1.21 mV

±12.18 mV

±1 V

±1.09 mV

±11.63 mV

Single-Ended Mode

±10 V

±10.98 mV

±49.08 mV