Measurement-computing USB-1208LS User Manual download pdf (Page 22)

USB-1208LS User's Guide Specifications

Non-volatile memory

Table 10. Memory specifications

Parameter

Specification

Memory size

8192 bytes

Memory configuration

Address Range

Access

Description

0x0000 – 0x17FF

Read/Write

A/D data (4K samples)

0x1800 – 0x1EFF

Read/Write

User data area

0x1F00 – 0x1FEF

Read/Write

Calibration data

0x1FF0 – 0x1FFF

Read/Write

System data

Power

Table 11. Power specifications

Parameter

Conditions

Specification

Supply current (Note 5)

20 mA

+5V USB power available (Note 6)

Connected to self-powered hub

4.5 V min, 5.25 V max

Connected to bus-powered hub

4.1 V min, 5.25 V max

Output current (Note 7)

Connected to bus-powered hub

450 mA min, 500 mA max

Connected to bus-powered hub

50 mA min, 100 mA max

Note 5: This is the total current requirement for the USB-1208LS which includes up to 5mA for the status

LED.

Note 6: Self-powered refers to USB hubs and hosts with a power supply. Bus-powered refers to USB hubs and

hosts without their own power supply.

Note 7: This refers to the total amount of current that can be sourced from the USB +5V, analog outputs and

digital outputs.

General

Table 12. General specifications

Parameter

Conditions

Specification

USB controller clock error

25 °C

±30 ppm max

0 °C to 70 °C

±50 ppm max

Device type

USB 1.1 low-speed

Device compatibility

USB 1.1, USB 2.0

Environmental

Table 13. Environmental specifications

Parameter

Specification

Operating temperature range

–0 to 70 °C

Storage temperature range

–40 to 70 °C

Humidity

0 to 90% non-condensing

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