Measurement Computing PCI-QUAD04, User Manual

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Chapter 4
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in
italic text are guaranteed by design.
Power consumption
Table 1. Power consumption specifications
Not supplying power to external encoders:
+5 V
325 mA typical, 460 mA max.
Typical supplying 1 Dynamics Research Incremental Optical Rotary Encoder part number M21AAFOBB2E-2500:
+5 V
1058 mA typical, 1479 mA max.
Input
Table 2. Input specifications
Receiver type SN75ALS175 quad differential receiver
Configuration Each channel consists of PhaseA input, PhaseB input and Index input; each
input switch / jumper selectable as single-ended or differential
Differential
! PhaseA, PhaseB and Index (+) inputs at user connector routed to (+) inputs of
differential receiver.
! PhaseA, PhaseB and Index (-) inputs at user connector routed to (-) inputs of
differential receiver.
Single - ended
!
PhaseA, PhaseB and Index (+) inputs at user connector routed to (+) inputs of
differential receiver.
!
PhaseA, PhaseB and Index (-) inputs at user connector routed to ground.
(-) inputs of differential receiver routed to +3 V reference.
Number of channels 4
Common mode input voltage range ±12 V max.
Differential input voltage range ±12 V max.
Input sensitivity ±200 mV
Input hysteresis 50 mV typ.
Input impedance 12 k Ω min.
Propagation delay 27 ns max. (tpLH, tpHL)
Absolute maximum input voltage:
Differential ±14 V max.
Miscellaneous
! Meets or exceeds ANSI EIA/TIA-422-B, EIA/TIA-423-B, RS-485.
! Meets ITU recommendations V.10, V.11, X.26, X.27.
! Designed for multipoint busses on long lines and in noisy environments.
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