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

Power*

Supply Current

During USB enumeration: < 100 mA

After USB enumeration, including DIO, AO, SYNC, and +VO output

loading: < 500 mA

+VO power available after USB enumeration: 4.5 V min, 5.25 V max

+VO output current after USB enumeration: 100 mA max

General

Device type: USB 2.0 full-speed mode (12 Mbps)

Device compatibility: USB 1.1, 2.0

Environment

Operating temperature: 0 ˚C to 70 ˚C

Storage temperature: –40 ˚C to 70 °C

Relative humidity: 0% to 90% non-condensing

Signal I/O connector

USB-1208FS-Plus, USB-1408FS-Plus: 2 banks of screw-terminal blocks

USB-1208FS-Plus-OEM, USB-1408FS-Plus-OEM: Two 20-pin, 0.1 in. pitch

headers

Mechanical

Dimensions (L × W × H)

USB-1208FS-Plus, USB-1408FS-Plus: 79 × 82 × 27 mm (3.20 × 3.10 × 1.05 in.)

USB-1208FS-Plus-OEM, USB-1408FS-Plus-OEM: 81.28 × 70.36 × 13.72 mm

(3.20 × 2.77 × 0.54 in.)

USB-1208LS

Analog Input

A/D converter type: Successive approximation

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

Input voltage range for linear operation, SE mode

CHx to GND: ±10 V max

Input common-mode voltage range for linear operation, differential mode,

DIFF mode

CHx to GND: –10 V min, 20 V max

Absolute maximum input voltage

CHx to GND: ±40 V max

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

Input impedance: 122 kΩ

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.

Software paced: 50 S/s typ, system-dependent

Hardware paced: 1.2 kS/s

BURSTIO to 4 kS FIFO: 8 kS/s

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

Resolution

DIFF: 12 bits, no missing codes

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

SE mode)

CAL accuracy: CAL = 2.5 V, ±0.05% typ, ±0.25% max

Integral linearity error: ±1 least significant bit (LSB) typ

Differential linearity error: ±0.5 LSB typ

Repeatability: ±1 LSB typ

* Self-powered USB hubs and hosts have their own power supply. The USB

port(s) on your computer are root port hubs. All externally powered root

port hubs (desktop computers) provide up to 500 mA of current for a

USB device. Battery-powered root port hubs provide 100 mA or 500 mA,

depending upon the manufacturer. A laptop PC that is not connected to an

external power adapter is an example of a battery-powered root port hub.

Bus-powered USB hubs and hosts do not have their own power supply.

CAL current

Source: 5 mA max

Sink: 20 µA min, 200 nA typ

Trigger source (software-selectable): External digital (TRIG_IN)

Analog Input Accuracy

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

Accuracy Components, All Values are (±)

Range % of Reading

Gain Error at FS

(mV)

Offset

(mV)

Accuracy

at FS (mV)

Differential Mode

±20 V

0.2

40

9.766

49.766

±10 V

0.2

20

9.766

29.766

±20 V

0.2

40

9.766

49.766

±10 V

0.2

20

9.766

29.766

±5 V

0.2

10

9.766

19.766

±4 V

0.2

8

9.766

17.766

±2.5 V

0.2

5

9.766

14.766

±2 V

0.2

4

9.766

13.766

±1.25 V

0.2

2.5

9.766

12.266

±1 V

0.2

2

9.766

11.766

Single-Ended Mode

±10 V

0.2

20

19.531

39.531

Analog Output

D/A converter type: PWM

Resolution: 10 bits, 1 in 1024

Output range: 0 V to 5 V

Number of channels: 2

Throughput (software paced)

100 S/s single-channel mode

50 S/s dual-channel mode

Power on and reset voltage: Initializes to 000h code

Maximum voltage

Vs is the USB +5 V power. The maximum analog output voltage is equal to Vs

at no load. V is system-dependent and may be less than 5 V.

No load: Vs

1 mA load: 0.99 * Vs

5 mA load: 0.98 * Vs

Output drive (each D/A out): 30 mA

Slew rate: 0.14 V/ms typ

Specifications