D E T A I L E D A R C H I T E C T U R E
Data Device Corporation
SB-3642 Manual
Rev D – 4/19
19
4.3.3.1 I/O Characteristics
•
Discrete Outputs:
- Max Output Voltage = 30 V
- Any single output can drive 100 mA at 25
°
C
•
Discrete Inputs:
- Input pins are directly connected to inputs of the opto-couplers.
- Max Input voltage = 30 V
- Input impedance is approximately 2.7 k
Ω
with input turned on and high
impedance with input approximately less than 3 V
4.3.4 Incremental Encoder Emulation (A Quad B)
Note: This feature is only available on the 4-channel board, SB-3624xF4.
The SB-3642 can also be used for incremental encoder emulation. The following
outputs are readily available on the front I/O connector: A, B, and ZIP (Zero Index
Pulse). The timing of the A & B outputs are dependent on the rate of change of the
resolver position (rps or degrees per second) and the encoder resolution latched into
the converter (refer to Figure 5). The calculations for the timing are:
n = resolution of parallel data
t = 1 / (2n * Velocity(RPS))
T = 1 / (Velocity(RPS))
