Measurement Computing USB-2627 - Manual (Page 21)

USB-2627 User's Guide Specifications
21
Noise performance
For the peak-to-peak noise distribution test, a single-ended input channel is connected to AGND at the input
terminal block, and 32,000 samples are acquired at the maximum rate.
Table 3. Noise performance specifications
Range Counts LSBrms
±10 V 8 1.21
Settling time for Multichannel Measurements
Settling time is defined as the accuracy that can be expected after one conversion when switching from a
channel with a DC input at one extreme of full scale to another channel with a DC input at the other extreme of
full scale.
Table 4. Input settling time specifications in µS, typical
Range 1 µS settling accuracy
(% FSR)
5 µS settling accuracy
(% FSR)
10 µS settling accuracy
(% FSR)
±10 V 0.0152 0.0061 0.0015
Analog output
Table 5. Analog output specifications
Parameter Condition Specification
Number of channels 4
Resolution 16 bits
Output ranges Calibrated ±10 V
Output transient Host computer is reset, powered on, suspended,
or a reset command is issued to the device Duration: 100 ms
Amplitude: 2V p-p
Powered off Duration: 100 ms
Amplitude: 5 V peak
Differential
non-linearity ±0.25 LSB typ
±1 LSB max
Output current XDACx pins ±3.5 mA max
Output short-circuit
protection XDACx connected to AGND Unlimited duration
Output coupling DC
Power on and
reset state DACs cleared to zero-scale: 0 V, ±150 mV
Pacer source Two programmable sources:
 Internal output scan clock
 External output scan clock (XDPCR),
independent of external input scan clock
(XAPCR)
Trigger sources TTLTRIG (see External trigger on page 23)
Output update rate 1 MS/s max (Note 3)
Settling time To rated accuracy, 10 V step 2 µs
Slew rate 20 V/µs
Throughput Software paced 33 S/s to 4,000 S/s typ, system-dependent
Hardware paced 1 MS/s max, system-dependent
Note 1: Leave unused XDACx output channels disconnected.
Note 2: XDACx defaults to 0 V whenever the host computer is reset, powered on, suspended, or a reset
command is issued to the device.