Measurement-computing USB-1208FS-Plus Manuel d'utilisateur télécharger pdf (Page 23)

USB-1208FS-Plus User's Guide Specifications

Analog output

Table 8. Analog output specifications

Parameter

Condition

Specification

Resolution

12-bits, 1 in 4,096

Output range

0 V to 5.0 V

Number of channels

Throughput (Note 4)

Software paced

250 S/s single channel typ, PC dependent

Hardware paced

50 kS/s max per channel

Power on and reset voltage

Initializes to 000h code

Output drive

Each D/A OUT

5 mA, sourcing

Slew rate

0.8 V/ µs typ

Note 4: Maximum throughput when scanning is machine dependent.

Table 9. Analog output accuracy, all values are (±); accuracy tested at no load

Range

Accuracy (LSB)

0 V to 5.0 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 5.0 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: Zero-scale offsets may result in a fixed zero-scale error producing a "dead-band” digital input code

region. In this case, changes in digital input code at values less than 0x040 may not produce a

corresponding change in the output voltage. The offset error is tested and specified at code 0x040.

Digital input/output

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. Port B is high current drive.

Pull up/pull-down configuration

All pins pulled up to 5V via 47 kΩ resistors (default). Change to pull-down using

internal user-configurable jumpers.

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, Port A

4.4 V min (IOH = –20 µA)

3.84 V min (IOH = –6.0 mA)

Output low voltage, Port A

0.1 V max (IOL = 20 µA)

0.33 V max (IOL = 6.0 mA)

Output high voltage, Port B

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24.0 mA)

Output low voltage, Port B

0.1 V max (IOH = 50 µA)

0.44 V max (IOH = 24.0 mA)

Power on and reset state

Input

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

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