CC1110FX Просмотр технического описания (PDF) - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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CC1110FX

Low-power sub-1 GHz RF System-on-Chip (SoC) with MCU, memory, transceiver, and USB controller

TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 

CC1110Fx / CC1111Fx

7.4 Crystal Oscillators

7.4.1 CC1110Fx Crystal Oscillator (26 – 27 MHz)

TA = 25 °C, VDD = 3.0 V if nothing else is stated.

Parameter

Crystal frequency

Crystal frequency

accuracy

requirement

C0

Load capacitance

ESR

Start-up time

Power Down

Guard Time

Min Typ Max Unit Condition/Note

26

26

27 MHz Referred to as fXOSC.

±40

ppm This is the total tolerance including a) initial tolerance, b) crystal

loading, c) aging, and d) temperature dependence.

The acceptable crystal tolerance depends on RF frequency and

channel spacing / bandwidth.

1

5

7

pF Simulated over operating conditions

10 13 20 pF Simulated over operating conditions

100 Ω Simulated over operating conditions

250

µs fXOSC = 26 MHz

Note: A Ripple counter of 12 bit is included to ensure duty-cycle

requirements. Start-up time includes ripple counter delay until

SLEEP.XOSC_STB is asserted

3

ms The crystal oscillator must be in power down for a guard time before it

is used again. This requirement is valid for all modes of operation.

The need for power down guard time can vary with crystal type and

load. Minimum figure is valid for reference crystal NDK, AT-41CD2

and load capacitance according to Table 29.

If power down guard time is violated increased CRC error can be

present in the first few radio packets after power down.

Table 11: CC1110Fx Crystal Oscillator Parameters

7.4.2 CC1111Fx Crystal Oscillator (48 MHz)

TA = 25 °C, VDD = 3.0 V if nothing else is stated.

Parameter

Crystal frequency

Crystal frequency

accuracy

requirement

C0

Fundamental

Load capacitance

ESR

Start-up time

Fundamental

crystal

Min Typ Max Unit Condition/Note

48

MHz Referred to as fXOSC.

48MHz crystal gives a system clock of 24MHz.

Please note that there are restricted usage in the frequency bands

863-870 MHz (due to spurious emission). See DN016 Compact

antenna solutions for 868/915MHz [14]

±40

ppm This is the total tolerance including a) initial tolerance, b) crystal

loading, c) aging, and d) temperature dependence.

The acceptable crystal tolerance depends on RF frequency and

channel spacing / bandwidth.

Simulated over operating conditions. Variation given by reference

crystal NX2520SA from NDK (fundamental).

0.85 1 1.15 pF

15 16 17 pF Simulated over operating conditions

60

Ω Simulated over operating conditions

Note: A Ripple counter of 14 bit is included to ensure duty-cycle

requirements. Start-up time includes ripple counter delay until

650

µs SLEEP.XOSC_STB is asserted

Table 12: CC1111Fx Crystal Oscillator Parameters

SWRS033E

Page 20 of 239

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