CC2560A Datasheet, PDF (24/52 Pages) Texas Instruments – Dual-Mode Bluetooth Controller

CC2560A NRND; CC2564 NRND
CC2560A, CC2560B, CC2564, CC2564B
SWRS121E – JULY 2012 – REVISED JANUARY 2016
www.ti.com
6.3.2.3 Fast Clock Using External Crystal
The CC256x device incorporates an internal crystal oscillator buffer to support a crystal-based fast-clock
scheme. The supported crystal frequencies are 26 and 38.4 MHz.
The frequency accuracy of the fast clock source must not exceed ±20 ppm (including the accuracy of the
capacitors, as specified in the Bluetooth specification).
Figure 6-8 shows the recommended fast-clock circuitry.
CC256x
XTALM
C1
Oscillator
buffer
XTALP
XTAL
C2
SWRS098-003
Figure 6-8. Fast-Clock Crystal Circuit
Table 6-1 lists component values for the fast-clock crystal circuit.
Table 6-1. Fast-Clock Crystal Circuit Component
Values
FREQ (MHz)
26
C1 (pF)⁽¹⁾
12
C2 (pF)⁽¹⁾
12
(1) To achieve the required accuracy, values for C1 and C2 must be
taken from the crystal manufacturer's data sheet and layout
considerations.
6.4 Functional Blocks
6.4.1 RF
The device is the third generation of TI Bluetooth single-chip devices using DRP architecture.
Modifications and new features added to the DRP further improve radio performance.
Figure 6-9 shows the DRP block diagram.
TX digital data
Digital
Transmitter path
Amplitude
Phase
ADPLL
DPA
Receiver path
RX digital data
Demodulation
ADC
IFA
Filter
LNA
24
Detailed Description
Figure 6-9. DRP Block Diagram
SWRS092-005
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