Measurement-computing USB-1208FS Manuel d'utilisateur télécharger pdf (Page 22)

USB-1208FS User's Guide Specifications

Analog output

Table 8. Analog output specifications

Parameter Conditions Specification

Resolution

12-bits, 1 in 4096

Output range

0 V to 4.096 V, 1 mV per LSB

Number of channels

Throughput (Note 4) Software paced 250 S/s single channel typical, PC dependent

Single channel, continuous scan 10 kS/s

Dual channel, continuous scan,

simultaneous update

5 kS/s

Power on and reset voltage

Initializes to 000h code

Output drive Each D/A OUT 15 mA

Slew rate

0.8V/microsecond (µs) typ

Note 4: Maximum throughput scanning to PC memory is machine dependent.

Table 9. Analog output accuracy, all values are (±)

Range Accuracy (LSB)

0 V to 4.096 V 4.0 typ, 45.0 max

Table 10. Analog output accuracy components, all values are (±)

Range % of FSR Gain Error at FS (mV) Offset (mV)

(Note 5)

Accuracy at FS

(mV)

0 V to 4.096 V 0.1 typ, 0.9 max 4.0 typ, 36.0 max 1.0 typ, 9.0 max 4.0 typ, 45.0 max

Note 5: Negative offsets will result in a fixed zero-scale error or "dead band." At the maximum offset of

–9 mV, any input code of less than 0x009 will not produce a response in the output.

Digital I/O

Table 11. Digital I/O specifications

Parameter Specification

Digital type CMOS

Number of I/O 16 (Port A0 through A7, Port B0 through B7)

Configuration 2 banks of 8

Pull up/pull-down configuration All pins pulled up to 5V via 47 kΩ resistors (default).

Hardware revisions D and later may be changed to pull-down using an internal

user-configurable jumper.

Previous revisions can be configured at the factory for pull-down.

Input high voltage threshold 2.0 V min

Input high voltage limit 5.5 V absolute max

Input low voltage threshold 0.8 V max

Input low voltage limit –0.5 V absolute min

0 V recommended min

Output high voltage

(IOH = –6.0 mA)

3.84 V min

Output low voltage

(IOL = 6.0 mA)

0.33 V max

Power on and reset state Input

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28 29

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