3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
3.2.4 LTE Modem 19.2 MHz Clock (Crystal, X200)
For the generation of the reference frequency an external TCVCXO module is used.
The temperature Compensation helps to minimize the initial synchronization time within a UMTS network.
The module has no Dedicated enable pin as its supply line is routed through SMARTi UE and open if not needed.
Figure 3.11 TCXO Circuit Diagram
10n
C205
100n
C200
200K
R203
2V8_TCXO
33
R202
U200
NL17SZ04XV5T2G
3
4
2
5
VCC
GND
2V8_TCXO
10n
C201
100n
C204
33n
C203
100
R200
19.2MHz
X200
TG-5025CG-19_2M
3
2
6
5
4
1
VC
VCC
TP1
TP2
GND
OUT
TCXO_IN
AFC_OUT
REF_CLK_OUT