Texas Instruments CC400DK Manuale utente

User Manual

Rev. 1.5

CC400DK Development Kit

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 2 of 22

Table of contents

TABLE OF CONTENTS............................................................................................................ 2

INTRODUCTION ....................................................................................................................... 3

EVALUATION BOARD ............................................................................................................. 3

DESCRIPTION ........................................................................................................................... 4

LAYOUT SKETCHES AND CIRCUIT DRAWINGS............................................................................... 9

BILL OF MATERIALS................................................................................................................. 15

USING THE DEVELOPMENT KIT.......................................................................................... 19

APPENDIX A........................................................................................................................... 20

A.1 FINE TUNING PROCEDURE OF LNA/PA MATCHING NETWORK .......................................... 20

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 3 of 22

Introduction

The CC400 single chip transceiver includes many features and great flexibility which makes

the chip suitable for a very large number of applications and system requirements. The

CC400 Development Kit is designed to make it very easy for the user to evaluate transceiver

performance and in short time develop his own applications.

The Development Kit includes two evaluation boards with a complete CC400 transceiver,

voltage regulator and PC interface circuitry. Using the evaluation board connected to a PC

running the SmartRF®Studio software, various system parameters can be changed and

tested by key-strokes.

Technical features:

RF power up to 25mW (14dBm) programmable in 1dB steps

-112 dBm sensitivity for 10-3 bit error rate (1.2kbps, 20kHz frequency separation)

Logic level data input/output (Manchester coded)

Selectable RF filtering (SAW or LC)

Selectable IF filtering

All set-up controlled by PC

Selectable 3V or 4-10Vunregulated voltage supply inputs

This user manual describes how to get started with the Development Kit. You will also find

detailed description of the evaluation board and advice how to develop your own applications.

For details on how to use the SmartRF®Studio software please refer to the SmartRF®Studio

user manual.

Your SmartRF®CC400DK Development Kit should contain the following items:

Evaluation circuit boards (PCB) 2 ex

CC400 single chip transceiver 5 ex

PC parallel port extension cable 2 ex 25-pin D-sub, male-female, 3m

Adapter 4 ex SMA male-BNC female

Antenna 2 ex 50Ω, λ/4 monopole, SMA male

Quick Start Instructions

SmartRF®CD-ROM

The evaluation board includes a significant number of components for great flexibility.

However, only a minor part of these components are required in an actual application. Check

the datasheet for a typical application circuitry.

Evaluation board

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.

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 5 of 22

Figure: The power connector with an amperemeter attached.

RF-section

The RF section consists of a CC400 chip with external components. The different

components are explained below.

The loop filter

The PLL loop filter contains the components C121-C123 and R121-R123. The software

program calculates the component values. Using the calculated component values for the

loop filter will give an optimum loop bandwidth for the selected system parameters.

The component values used in the CC400EB is selected for 9.6 kbit/s data rate, but can also

be used for evaluation of lower data rates.

The transmitted frequency is FSK modulated, which means that the bits ‘0’ and ‘1’ has

different frequencies, see Frequency separation in chapter 4.1.1.5 in SmartRF®Studio user

manual.

Note: If you need a shorter switching time between the two frequencies, the PLL settling time

has to be shorter. To find the new component values that you need for the loop filter, the

software program can be used as a calculator. Using a higher data rate value will give you a

larger loop bandwidth, but also an increase in the side-band noise on the carrier. A warning

may appear when increasing the data rate. To get around this warning, try to set the X-tal

accuracy to zero. Do not update the device when doing this, but use Enter to calculate the

values and return to your earlier settings afterwards.

External IF filter

The evaluation board is equipped with an external 455kHz ceramic filter. Input and output

impedance to the CC400 is 1.5kΩ, and the bandwidth is approximately 30kHz.

4-10V

Iout

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 6 of 22

The LOCK signal

A LOCK signal is connected to the parallel port interface to be monitored by the software. The

signal tells you if the synthesiser frequency is in lock. It is also available at a test pin, TP2,

and is active high.

NOTE: If Power Down mode is selected when the LOCK signal is high, the current

consumption will be approximately 23 uA. This is due to the current flowing from the LOCK

pin into the external buffer transistor (Q2). This transistor could be replaced with a MOSFET

to avoid this trickle current. Without this extra load the CC400 Power Down current is less

than 1 uA.

The modulation input/output

The modulation input/output (DIO) is connected to a separate connector. The connector type

is SMA female. The data to be sent has to be Manchester encoded (also known as bi-phase-

level coding). The Manchester code ensures that the signal has no DC component, which is

necessary for the FSK demodulator. The Manchester code is based on transitions; a “0” is

encoded as a low-to-high transition, a “1” is encoded as a high-to-low transition. See figure

below. Maximum data-rate is 9.6 kbit/s and is chosen in the software. To test your module

use a 3Vpp logic level with 1-10 kHz square wave.

Time

data

10110001101

LNA/PA matching

The input/output matching network is optimised for 433.92MHz operation. The component

values are calculated in the software program, and consist of C51, C61, L51 and L61. Using

the specified component values for the input/output match will give an optimum match at the

specified operating frequency. Minor tuning of the component values may be necessary to

compensate for layout parasitics at other frequencies or other layouts. See appendix A.

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 7 of 22

The Voltage Controlled Oscillator (VCO)

The VCO tank on the evaluation board is optimised for the 433MHz band, covering

approximately 410 – 450MHz. The tank contains the components C91, C92, C93, L91 and

the variable capacitance D2.

To operate in other frequency bands, C93 and L91 can be altered. To increase the operation

frequency C93 or L91 (or both) should be decreased (use 8.2nH for L91, and 1.5pF or 1.8pF

for C93). To decrease the operation frequency C93 or L91 (or both) should be increased (use

12nH for L91, and 2.7pF or 3.3pF for C93).

To find the tuning range for the new VCO tank, set the RF frequency to 300 MHz and 500

MHz in the software, update the device and measure the output frequency. In this way the

VCO tank will be tuned to its minimum and maximum operation frequency respectively.

For further details, please contact Chipcon.

The crystal oscillator

Crystal frequency is set to 12.000 MHz, X1. The crystal oscillator circuit has a trimmer

capacitor, CT152, which reduces the initial tolerance of the crystal to zero by careful

adjustment using a precision frequency counter. The crystal used at this board has ±10 ppm

initial tolerance and ±10 ppm drift over the –10 to +70 °C temperature range. The crystal

oscillator has an AC coupled (C153) test pin for external clock injection, TP1. Be sure to

remove the crystal when an external clock is used. The external clock should have amplitude

of 1-3Vpp. If using other crystals they should be designed for 12pF load capacitance.

The preselector filter options

There are three preselector filter options: LC-filter, SAW filter, or no filter used. Each of the

three filter alternatives is equipped with a female SMA antenna connector. To choose

between the three filters there is a zero ohm resistor that can be moved (R61-R63).

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 8 of 22

Unfiltered antenna output

The unfiltered antenna output has been made with an option. Two components, L71 and

C71, can be used to match the antenna if the antenna impedance is different from 50Ω. To

select this output the zero ohm resistor must be put in R61, and R62 and R63 shall not be

mounted.

LC-filtered antenna output

A LC-filter consisting of L52, C52 and C53 make up a 3dB-equal ripple low-pass filter that

prevents harmonics to be emitted from the transmitter. In receive mode the filter removes

high frequencies in order to prevent distortion and jamming of in the receiver. The filter is

designed for 50Ωtermination impedance. The LC-filter is selected by placing the zero ohm

resistor in the R62 position. For operation at other frequencies, please use the formulas

below.

⎟

⎠

⎞

⎜

⎝

⎛

−

⋅≈ 1333.01

RFC

ωω

6.35

067.0

where ωCis the cut-off frequency and ωRF is the transmitted RF frequency .

SAW filtered antenna output

To choose this output the zero ohm resistor must be put in the R63 position. The components

around the filter (F2) can be changed to match any SAW filter type. The SAW filter will

introduce additional loss, but will increase the selectivity of the receiver. The 3dB bandwidth

is approximately 200 kHz. The filter can be replaced with another SAW filter with a 3dB

bandwidth of 2 MHz if desirable.

Note: Using the SAW filter, the output power amplifier class should be A or AB and the output

power should not exceed 0 dBm. This will give approximately –5 dBm at the antenna output.

Using power settings above 0 dBm may cause stability problems.

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 9 of 22

Layout sketches and circuit drawings

25 pin D-SUB

DIO

ANT

(LC filter)

ANT

(No filter)

ANT

(SAW filter)

4-10V

Switch

Module

slot

(future use)

4-10V

GND

I_out

I_in 3V

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 10 of 22

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