preliminary

preliminary

iC149

PROGRAMMABLE ns-PULSE GENERATOR

Rev A0.2, Page 2/6

DESCRIPTION

Pulse generator iC149 produces pulses with a small

duty cycle in the range of ca. 1 ns up to 64 ns max. in

steps of 0.25 ns at a pulse frequency of 1 MHz. The

pulse width is set by means of two hexadecimal cod-

ing switches in coarse and fine steps.

The pulses are output both as LVDS and TTL signals.

This module can easily be used with the evaluation

boards HG1D, NZN1D ans NZP1D.

ELECTRICAL CHARACTERISTICS

Test Conditions: Vs = ±15 V, Ta = 25 °C, System Impedace 50 Ω

Item

Symbol

Parameter

Conditions

Unit

No.

Min.

Typ.

Max.

Power Supply

101

V5

Power Supply

4.75

5

5.25

V

102

I(V5)

Supply Current

V5 = 5 V, S1 = OFF

45

mA

V5 = 5 V, S1 = ON, TRIGGER open

50

mA

V5 = 5 V, S1 = ON, TRIGGER 50 Ω vs. Ground

75

mA

Pulse Width

201

Maximum Pulsweite

V5 = 5 V, Ta = 27 °C, coarse = "F", fine = "F"

63.75

ns

202

Minimum Pulsweite

V5 = 5 V, Ta = 27 °C, coarse = "0", fine = "C"

1

ns