Datasheet

www.ti.com

Hardware Setup, CW Mode

9.3 External Clock for CW Mode

The CW mode clocks can be supplied from J9 (X16/X8/X4/X1) and J10 (X1) using external signal

generators. The manufacture default setup uses ON BOARD CLOCK, with which C154, C155, C156, and

C157 are installed. To switch to an external clock, these four capacitors must be uninstalled and

capacitors C49,C50,C52, and C53 must be installed. The following table shows the configuration for these

eight capacitors.

Table 1. Configuration for Clock Capacitors

Capacitor Onboard Clock External Clock Comments

C27 Uninstalled Installed Top layer of the EVM

C28 Uninstalled Installed Bottom layer of the EVM

C100 Uninstalled Installed Bottom layer of the EVM

C102 Uninstalled Installed Top layer of the EVM

C29 Installed Uninstalled Top layer of the EVM

C30 Installed Uninstalled Top layer of the EVM

C25 Installed Uninstalled Top layer of the EVM

C26 Installed Uninstalled Top layer of the EVM

Figure 22. Relevant Capacitors for CW Mode, Top and Bottom Side

9.4 External ADC Sampling Clock

To use the external clock generator to test the AFE5809, perform the following steps.

1. Reconfigure JP9 as shown in Figure 23. The rest of the jumpers remain the same.

2. Connect the external generator as shown in Figure 23.

3. Set the generator output to 65 MHz, 13 dBm.

SLOU338A–October 2012–Revised November 2012 AFE5809EVM Evaluation Module

Submit Documentation Feedback