D E T A I L E D A R C H I T E C T U R E
Data Device Corporation
SB-3624XIX-3L0 Manual
www.ddc-web.com
Rev D -10/15
25
5.2.6 Built-in-Test (BIT) Output
The Built-In-Test (BIT) will flag Loss-of-Signal (LOS), Loss-of-Reference (LOR), Loss-
of-Tracking (LOT), and 180° phase error fault conditions. The BIT output is active low
and a logical OR of these four conditions. Any one or combination of these conditions
will assert the BIT output. These fault conditions are described in Table 8 below.
Also,
excessive error is detected when the difference between the analog input and the
digital output exceeds approximately 100 LSBs of positive or 250 LSBs of negative
error (in the selected resolution), the BIT will be asserted.
Table 8. BIT Fault Conditions
Fault Condition
Descritption
LOS
Both SIN and COS inputs (S1-S3, S2-S4) must fall below 0.5 Vrms.
LOR
The reference input (RH-RL) must fall below 0.5 Vrms.
LOT
This condition occurs when the difference between the anlog input and digital
output exceeds 100 lsbs in the positive direction or 250 lsbs in the negative
direction. This typically occurs when exceeding the maximum tracking rate or
during power up.
180° Phase Error
180° phase error input signal to reference input (false null) causes a BIT plus
kickstarts the converter counter to correct the error.
5.2.7 Two Speed
Two speed allows resolutions greater than 16 bits to be achieved. See
“CalculateTwoSpeed” in Appendix A of the card manual for details. Also refer to the
RD/RDC Applications manual (MN-19220XX-001) and the Synchro/Resolver
Conversion Handbook. These documents are available
at www.ddc-web.com.
5.2.8 Self Test
The device has a built-in self test capability which can run a simulated test angle of 0,
45, or 90 degrees on each channel. Any channel not reporting back an answer within
± 1° will fail.
5.2.9 On-board Reference Sine Oscillator
The on-board oscillator may be used to take the place of an external drive oscillator
for the excitation signal. This oscillator is available in several options, see the ordering
information page for details. Depending on oscillator selected, there are three
programmable voltage ranges. Via software, the oscillator frequency and voltage are
programmed. Voltage can be programmed up to max voltage selection ordered.
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