- 10 -

NEL

MC740-430E

OPERATION

CAUTION

The MC740-430E is very sensitive to electrostatic discharge (ESD).

ESD preventive

measures must be employed at customer’s working desk.

Before operating the

MC740-430E, please read the handling precautions on page 14.

Before connecting any cables to the input and output terminals, short the center and outer

conductors of the cable together.

Mechanical shock can damage or destroy the MC740-430E. Please handle carefully.

Do not remove the warranty seals and/or open the cover.

Turn-on procedure

Connect a DC power supply, signal sources (a pulse pattern generator, PPG, and a

synthesizer), an oscilloscope, and a device under test (see the sample implementation, Fig.

9). Here, outputs from the equipments should be turned-off.

If customer connects an AC coupled circuit to the DATA and/or /DATA output terminals,

terminate the terminals with 50-ohm resistors via a bias-tee (see Fig. 9).

Output terminals unused should be terminated with 50-ohm resistors.

Power supply sequence is shown in table 1.

Table 1 Turn-On Procedure

Turn-on sequence

Procedure

Step 1

Make sure the output voltage of the DC power

supply has been set to be - (minus) 6 V.

The DC -6 V on.

Step 2

Main switch (rear panel) on.

A current of 1 A is observed at the DC power

supply.

Wait until the current becomes stable

(approximately 10 sec).

Step 3

Front switch on.

A current of 7 A is observed at the DC power

supply.

Wait until the current becomes stable

(approximately 10 sec).

Step 4

RF input on.

Delay adjustment

To operate the MC740-430E normally, the following delay adjustments are needed (refer to

the function diagram, Fig. 1, and sample implementation, Fig. 9).

(1) CLK10 output: Adjust the timing between the input data (after latching) and the

internal clock at the 4:1 MUX.

(2) Clock delay for the DFF (“

φshifter” on front panel): Adjust the timing between the

output signal from the 4:1 MUX and the clock signal for the DFF.