CC2560A_16 Datasheet, PDF (22/51 Pages) Texas Instruments – Dual-Mode Bluetooth Controller

CC2560A NRND; CC2564 NRND
CC2560A, CC2560B, CC2564, CC2564B
SWRS121E – JULY 2012 – REVISED JANUARY 2016
www.ti.com
6.3.2.1 External F_REF DC-Coupled
Figure 6-2 and Figure 6-3 show the clock configuration when using a square wave, DC-coupled external
source for the fast clock input.
NOTE
A shunt capacitor with a range of 10 nF must be added on the oscillator output to reject high
harmonics and shape the signal to be close to a sinusoidal waveform.
TI recommends using only a dedicated LDO to feed the oscillator. Do not use the same VIO
for the oscillator and the CC256x device.
FREFP
CC256x
FREFM
SWRS121-009
Figure 6-2. Clock Configuration (Square Wave, DC-Coupled)
V_Fref [V]
2.1
V_{high_min}
1.0
0.37
V_{low_max}
–0.2
t
clksqtd_wrs064
Figure 6-3. External Fast Clock (Square Wave, DC-Coupled)
Figure 6-4 and Figure 6-5 show the clock configuration when using a sine wave, DC-coupled external
source for the fast clock input.
FREFP
CC256x
FREFM
VDD_IO
SWRS121-007
Figure 6-4. Clock Configuration (Sine Wave, DC-Coupled)
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Detailed Description
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