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CC3135 Datasheet(PDF) 35 Page - Texas Instruments

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Part No. CC3135
Description  SimpleLink Wi-Fi, Dual-Band Network Processor, solution for MCU applications
Download  78 Pages
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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CC3135 Datasheet(HTML) 35 Page - Texas Instruments

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CC3135R
WLAN_XTAL_P
WLAN_XTAL_N
XO (40 MHz)
82 pF
TCXO_EN
EN
OUT
Vcc
C
35
CC3135
www.ti.com
SWAS037 – JANUARY 2019
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Product Folder Links: CC3135
Specifications
Copyright © 2019, Texas Instruments Incorporated
5.17.5.4 Fast Clock (Fref) Using an External Oscillator
The CC3135 device can accept an external TCXO/XO for the 40-MHz clock. In this mode of operation, the
clock is connected to WLAN_XTAL_P (pin 23). WLAN_XTAL_N (pin 22) is connected to GND. The
external TCXO/XO can be enabled by TCXO_EN (pin 21) from the device to optimize the power
consumption of the system.
If the TCXO does not have an enable input, an external LDO with an enable function can be used. Using
the LDO improves noise on the TCXO power supply.
Figure 5-12 shows the connection.
Figure 5-12. External TCXO Input
Table 5-17 lists the external Fref clock requirements.
Table 5-17. External Fref Clock Requirements (–40°C to +85°C)
CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Frequency
40.00
MHz
Frequency accuracy
(Initial plus temperature plus aging)
±20
ppm
Frequency input duty cycle
45%
50%
55%
Vpp
Clock voltage limits
Sine or clipped sine wave,
AC coupled
0.7
1.2
Vpp
Phase noise at 40 MHz
at 1 kHz
–125
dBc/Hz
at 10 kHz
–138.5
at 100 kHz
–143
Input impedance
Resistance
12
Capacitance
7
pF


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