BCM20713A1KUBXGT Datasheet, PDF (32/65 Pages) Cypress Semiconductor – Single-Chip Bluetooth Transceiver and Baseband Processor

BCM20713 Preliminary Data Sheet
Crystal Oscillator
b. With a 26 MHz reference clock. For a 13 MHz clock, subtract 6 dB. For a 52 MHz clock, add 6 dB.
c. Auto-detection of the frequency requires the crystal or external frequency reference to have less than
±50 ppm of variation and also requires an external LPO frequency which has less than ±250 ppm of variation
at the time of detection.
d. AT-Cut crystal or TXCO recommended.
Crystal Oscillator
The BCM20713 can use an external crystal to provide a frequency reference. The recommended configuration
for the crystal oscillator, including all external components, is shown in Figure 6.
Figure 6: Recommended Oscillator Configuration
XIN
0 to 18 pF*
Crystal
Oscillator
0 to 18 pF*
XOUT
*Capacitor value range depends on the
manufacturer of the XTAL as well as board layout.
External Frequency Reference
An external frequency reference generated by a TCXO signal that may be directly connected to the crystal input
pin on the BCM20713, as shown in Figure 7. The external frequency reference input is designed to not change
loading on the TCXO when the BCM20713 is powered up or powered down.
When using the BCM20713 with the TXCO OR gate option, GPIO 6 must be driven active high or active low.
Excessive leakage current results if GPIO6 is allowed to float.
Broadcom^®
December 21, 2015 • 20713-DS102-R
Single-Chip Bluetooth Transceiver and Baseband Processor
Page 31
BROADCOM CONFIDENTIAL