USB-1208FS-Plus-OEM User's Guide
Specifications
21
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
2
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 5
V 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
