CC2564_15 Datasheet, PDF (30/47 Pages) Texas Instruments – Bluetooth® and Dual-Mode Controller

CC256x
SWRS121D – JULY 2012 – REVISED JANUARY 2014
4.1.6 Slow Clock Requirements
Characteristics
Input slow clock frequency
Input slow clock accuracy
(Initial + temp + aging)
Input transition time t_r and t_f (10% to
90%)
Frequency input duty cycle
Slow clock input voltage limits
Condition
Bluetooth
ANT
Square wave, DC-coupled
Input impedance
Input capacitance
www.ti.com
Sym
t_r and t_f
V_IH
V_IL
Min
15%
0.65 ×
VDD_IO
0
1
Typ
32768
50%
Max
±250
±50
200
85%
VDD_IO
0.35 ×
VDD_IO
5
Unit
Hz
ppm
ns
V peak
V peak
MΩ
pF
4.1.7 External Fast Clock Crystal Requirements and Operation
Characteristics
Supported crystal frequencies
Frequency accuracy
(Initial + temperature + aging)
Crystal oscillator negative resistance
Condition
26 MHz, external capacitance = 8 pF
I_osc = 0.5 mA
26 MHz, external capacitance = 20 pF
I_osc = 2.2 mA
Sym
f_in
4.1.8 Fast Clock Source Requirements (–40°C to +85°C)
Characteristics
Condition
Sym
Supported frequencies
Reference frequency accuracy
Initial + temp + aging
F_REF
Fast clock input voltage limits Square wave, DC-coupled
V_IL
V_IH
Sine wave, AC-coupled
Sine wave, DC-coupled
Sine wave input limits, DC-coupled
Fast clock input rise time
(as % of clock period)
Square wave, DC-coupled
Duty cycle
Phase noise for 26 MHz
@ offset = 1 kHz
@ offset = 10 kHz
@ offset = 100 kHz
Min
650
490
Min
–0.2
1.0
0.4
0.4
0
35%
Typ
Max
Unit
26
MHz
±20
ppm
940
Ω
710
Typ
26
50%
Max
±20
0.37
2.1
1.6
1.6
1.6
10%
Unit
MHz
ppm
V
V
V_p-p
V_p-p
V
65%
–123.4
–133.4
–138.4
dBc/Hz
30
Device Specifications
Submit Documentation Feedback
Copyright © 2012–2014, Texas Instruments Incorporated