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OM-USB-1208HS Series User's Guide
Specifications
18
Analog output (OM-USB-1208HS-2AO, OM-USB-1208HS-4AO)
Table 5. Analog output specifications
Parameter
Condition
Specification
D/A converter
Texas Instruments DAC7553
Number of channels
OM-USB-1208HS-2AO:
2 independent
OM-USB-1208HS-4AO:
4 independent
Resolution
12 bits
Output range
Calibrated
±10 V
Uncalibrated
±10.2 V
Output transient
Host PC is reset, powered on, suspended, or
a reset command is issued to device.
Duration: 3 ms typ
Amplitude: 6 V p-p typ
D/A update rate
Software paced
33 to 5000 S/s typ, system dependent
Hardware paced
1 MHz max (per channel)
Sample clock source
Internal D/A clock or AOCKI
Monotonicity
12 bits
Output current
±3 mA max per channel
Output short-circuit
protection
Output connect to GND
Unlimited duration (10 mA typ)
Output coupling
DC
Power up and reset state
0 V
Output noise
0.53 mV rms
Settling time (to 0.05%)
20 V output step, (R
L
=5 kΩ, C
L
=200 pf)
5 µS max
Absolute accuracy
±0.1%
Slew rate
6.7 V/µs typ
Offset error drift
10 ppm/°C typ
Gain error drift
65 ppm/°C typ
Digital input/output
Table 6. Digital I/O specifications
Parameter
Specification
Digital type
CMOS
Number of I/O
16
Configuration
Each bit may be configured as input (power on default) or output
Pull-up configuration
The port has 47 kΩ resistors configurable as pull-up or pull-down with an internal
jumper. The default setting is pull-down.
Digital I/O transfer rate
(system-paced)
33 to 8000 port reads/writes or single bit reads/writes per second typ, system dependent.
Input high voltage
2.0 V min
5.5 V absolute max
Input low voltage
0.8 V max
–0.5 V absolute min
0 V recommended min
Output high voltage
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
Output low voltage
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current
±24 mA max per terminal (see "Power"section for additional information)
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