CYW20705B0KWFBGT datasheet(36/67 Pages) CYPRESS

No de pièce	CYW20705B0KWFBGT

Description	Single-Chip Bluetooth Transceiver and Baseband Processor

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Frequency References

BCM20705 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

Bluetooth Transceiver and Baseband Processor

November 13, 2014 • MCS20705-DS104-R

Page 35

Se ction 6: F r eq ue ncy Referenc es

The BCM20705 uses two different frequency references for normal and low-power operational modes. An

external crystal or frequency reference driven by a Temperature Compensated Crystal Oscillator (TCXO) signal

is used to generate the radio frequencies and normal operation clocking. Either an external 32.768 kHz or fully

integrated internal Low-Power Oscillator (LPO) is used for low-power mode timing.

Crystal Interface and Clock Generation

The BCM20705 uses a fractional-N synthesizer to generate the radio frequencies, clocks, and data/packet

timing, enabling it to operate from any of a multitude of frequency sources. The source can be external, such as

a TCXO, or a crystal interfaced directly to the device.

The default frequency reference setting is for a 20 MHz crystal or TCXO. The signal characteristics for the

crystal interface are listed in Table 4 on page 35.

Table 4: Crystal Interface Signal Characteristics

Parameter

Crystal

External Frequency Reference Units

Acceptable frequencies

12–52 MHz in 2 ppma steps

a. The frequency step size is approximately 80 Hz resolution.

12–52 MHz in 2 ppma steps

–

Crystal load capacitance

12 (typical)

N/A

pF

ESR

60 (max)

–

Ω

Power dissipation

200 (max)

–

μW

Input signal amplitude

N/A

400 to 2000

2000 to 3300 (requires a 10 pF

DC blocking capacitor to

attenuate the signal)

mVp-p

Signal type

N/A

Square-wave or sine-wave

–

Input impedance

N/A

≥1

≤ 2

MΩ

pF

Phase noise

@ 1 kHz

@ 10 kHz

@ 100 kHz

@ 1 MHz

N/A

–

< –120b

< –131b

< –136b

–

dBc/Hz

Auto-detection frequencies when

using external LPOc

12, 13, 14.4, 15.36, 16.2,

16.8, 18, 19.2, 19.44, 19.68,

19.8, 20, 24, 26, 33.6, 37.4,

and 38.4

12, 13, 14.4, 15.36, 16.2, 16.8,

18, 19.2, 19.44, 19.68, 19.8, 20,

24, 26, 33.6, 37.4, and 38.4

MHz

Tolerance without frequency trimmingd ±20

±20

ppm

Initial frequency tolerance trimming

range

±50

ppm

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