Texas Instruments CC400DK, User Manual, Page: 4 / 22

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 4 of 22
The kit includes an evaluation circuit board (PCB) with the following items:
•
CC400
•
Necessary external surface mounted devices, SMD, for the chip.
•
Voltage regulator 4V-10V to 3V regulated voltage.
•
Possibilities to apply a 3V voltage source directly (chosen by switches or connectors
at the board).
•
Voltage-level interface circuits between the CC400 (3V) and the parallel port of the
computer (5V).
•
Connector for a PC parallel port cable.
•
Connector for antenna and modulation data in/out.
•
Edge connector for future use.
This board is designed with great flexibility so that you can evaluate the circuit performance
for several circuit configurations, and in development of your own applications. A layout
sketch of the evaluation board is shown in chapter 0.
Description
The evaluation circuit board constitutes of three main parts. These are the RF-section, the
voltage supply and the PC-interface. The PC-interface contains voltage level shift circuit,
which buffers the control lines.
Voltage supply
You can chose between applying a 4-10V non-regulated supply voltage or a 3V regulated
supply voltage by setting a switch on the board (SPDT). If a non-regulated supply voltage is
applied, an on board regulator generates a regulated 3V supply. A diode prevents damage if
wrong polarity is used for the non-regulated input. The connector has five contacts, which is
shown below. In addition to the three supply voltage contacts, there are two contacts, which
can be used to measure the DC current to the CC400 chip. A short jumper is placed between
these two contacts for the circuit to work. If you want to measure the DC current, replace the
jumper with an amperemeter (as shown in the figure below). The current range is from 0 to 70
mA.