Evaluation board

AN2452

10/21

2

Evaluation board

2.1

Setup

1.

Connect the evaluation board to the PC parallel port via the cable included in the kit.

2.

3.

(1) or GND (0). The default is 000.

4.

Connect a signal generator to the REF_CLK connector (external reference clock).

Set the frequency as desired (13 MHz, 19.2 MHz, 76.8 MHz,…) and set the level to

10 dBm.

5.

Connect the RF OUT connector to a spectrum analyzer.

6.

Make sure that the device is not in hardware power-down (that is, ensure the switch is

not in the off position).

The lock detector LED is turned on when the device is locked.

The nominal value of the charge pump output current is controlled by the external resistor

R15 (4.7 k

Ω on the evaluation board).

The loop filter components are: C28, R17, R18, R18, C25, C30.

The output matching network can be adjusted, depending on the application.