BC41B143A-ANN-E4 ETC, BC41B143A-ANN-E4 Datasheet - Page 54

• Manufacturer Part Number: BC41B143A-ANN-E4
• Description: Bluecore 4-rom CSP EDR Single Chip Bluetooth v2.0 + EDR System
• Manufacturer: ETC

Device Terminal Descriptions
11.3
Crystal Oscillator (XTAL_IN, XTAL_OUT)
The BlueCore4-ROM CSP RF local oscillator and internal digital clocks are derived from the reference clock at
the BlueCore4-ROM CSP XTAL_IN input. This reference may be either an external clock or from a crystal
connected between XTAL_IN and XTAL_OUT. The external reference clock mode is described in Section 11.2.
11.3.1 XTAL Mode
BlueCore4-ROM CSP contains a crystal driver circuit. This operates with an external crystal and capacitors to
form a Pierce oscillator.
g
m
-
C
C
C
int
trim
trim
C
C
t2
t1
Figure 11.5: Crystal Driver Circuit
This material is subject to CSR’s non-disclosure agreement
BC41B143A-ds-002Pd
Page 54 of 89
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© Cambridge Silicon Radio Limited 2005