WF1946 datasheet(39/188 Pages) ETC2

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3.2 Input and output connections

WF1945B

3-9

Trigger/sweep input (TRIG/SWEEP IN)

Signal characteristics:

The following types are produced during the burst oscillation mode.

Trigger: Select oscillation start for either

Gate: Select oscillation at either high or low level.

Triggered gate: Oscillation start/stop at

. Select either.

Minimum pulse width is 50 ns.

In sweep oscillation mode, the sweep starts at

. Select either.

Minimum pulse width is 200 ns.

Input voltage :

High level

≥ +3.9 V

Low level

≤ +1.6 V

Input voltage range :

−0.5 to +5.5 V

Input impedance :

Pull up to +5 V at approx. 10 k

Ω

Ground :

Connected to chassis ground

Do not apply a signal exceeding the above input voltage range. The unit can be damaged.

• Drive circuit examples

Connect the trigger and sweep input drive signals to TTL or C-MOS logic IC outputs.

Since the input circuit is provided with a built-in pullup resistor, an open collector output drive can also be

used. However, contact chatter from a mechanical switch or relay can prevent normal operation. Also,

chattering will prevent normal operation when the oscillation mode is triggered gate.

Avoid using a logic IC circuit having a power supply voltage higher than +5 V such as example (c) for the

WF1945B input

! CAUTION

+5 V

+12 V～

(a) TTL logic output

(b) Open collector output

TRIG/SWEEP IN

+5 V

10 k

Ω

100

Ω

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