CC400

SWRS050

Page 7 of 32

8.

Frequency Synthesiser Section

Tc = 25°C @ VDD = 3.0 V if nothing else is stated. Measured on Chipcon’s

CC400DB

reference design.

Parameter

Min.

Typ.

Max.

Unit

Condition

Crystal Oscillator Frequency

4

12

13

MHz

Crystal frequency accuracy

requirement

+/- 50

ppm

The crystal frequency accuracy

and drift (ageing and temperature

dependency) will determine the

frequency accuracy of the

transmitted signal.

Crystal operation

Parallel

C151 and C161 are loading

capacitors, see page 17.

Crystal load capacitance

20

16

12

pF

pF

pF

4-6 MHz

6-10 MHz

10-13 MHz

Crystal oscillator start-up time

3

6

ms

12 MHz, 12 pF load

Output signal phase noise

-70

-90

-81

-107

dBc/Hz

dBc/Hz

dBc/Hz

dBc/Hz

10 kHz offset from carrier

100 kHz offset from carrier

Loop filter BW = 16 kHz

10 kHz offset from carrier

100 kHz offset from carrier

Loop filter BW = 3 kHz

RX / TX turn time

100

µs

PLL turn-on time, crystal oscillator

off in power down mode

4

ms

PLL turn-on time, crystal oscillator

on in power down mode

2

ms

It is recommended to wait at least

8 ms (6 ms crystal oscillator start-

up time and 2 ms PLL turn-on

time) before checking the PLL

Lock Indicator at the LOCK pin.

Please refer to chapter “PLL Lock

Indicator” on page 16 for a further

description.

Table 8: Frequency Synthesiser Section

9.

DC Characteristics

The DC Characteristics of

CC400 are listed in Table 10 below. Tc = 25°C if nothing else

stated.

Parameter

Min.

Typ.

Max.

Unit

Condition

Logic "0" input voltage

0

0.3*VDD

V

Logic "1" input voltage

0.7*VDD

VDD

V

Logic "0" output voltage

0

0.4

V

Output current -2.5 mA,

3.0 V supply voltage

Logic "1" output voltage

2.5

VDD

V

Output current 2.5 mA,

3.0 V supply voltage

Logic "0" input current

NA

-1

µA

Input signal equals GND

Logic "1" input current

NA

1

µA

Input signal equals VDD

Table 9: DC Characteristics