Measurement-computing USB-QUAD08 Bedienungsanleitung PDF herunterladen (Seite 29)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Counter

Table 1. Counter specifications

Parameter

Specification

Counter type

FPGA

Counters

8 (quadrature or normal)

Counter input modes

Quadrature (x1, x2, x4)/Totalize, Pulse width, Period

Mode options

Non-Recycle, Range Limit, Clear on Read, Modulo-N, Up/Down, Decrement

Index options

Latch, Clear|Reload, Decrement, Gate; mode dependent.

Resolution

16, 32 or 48-bit counters

Quadrature mode input frequency

10/5/2.5 MHz, max, in x1/x2/x4

Normal mode input frequency

10 MHz, max

De-bounce times

16 steps from 500 ns to 25 ms; positive or negative edge sensitive; glitch detect

mode or de-bounce mode; software-selectable.

Time-base and accuracy

48 MHz (24 MHz – 30 ppm with a 2xDLL (delay locked loop))

Counter read pacer

Internal or external scan pacer up to 8 MHz

Period/pulse width resolution

20.83 ns; 208.3 ns; 2.083 µs; or 20.83 µs

Input

Table 2. Input specifications

Parameter

Specification

Receiver type

SN75ALS175 quad differential receiver

Configuration

8 channels. Each channel consists of PhaseA input, PhaseB input and Index input;

each input is selectable as single-ended or differential.

Differential:

 PhaseA, PhaseB and Index (+) inputs at the user connector are routed to the

(+) inputs of differential receiver.

 PhaseA, PhaseB and Index (–) inputs at the user connector are routed to the

(–) inputs of the differential receiver.

Single-ended:

 PhaseA, PhaseB and Index (+) inputs at the user connector are routed to the

(+) inputs of the differential receiver.

 PhaseA, PhaseB and Index (–) inputs at the user connector are left floating.

The (–) inputs of the differential receiver are routed to the +3 V reference.

Common mode input voltage range

±12 V

Differential input voltage range

±12 V

Input sensitivity

±200 mV

Input hysteresis

50 mV, typ

Input impedance

12 kΩ, min

Absolute maximum input voltage

±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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