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3.3.4 26MHz Clock
C654
1000p
TCXO
C654
1000p
TCXO
3.3.5 Power Supplies and Control Signals
An external LDO [U605] is used to provide DC power to VCTCXO [X601], Buffer [U605] which is
used for buffering FEM control signals from DBB and the RF Main Chip [TRF6151C, U607].
RF2.85V
RF2.85V
C658
1u
(1608)
C658
1u
(1608)
RF2.85V
X601
RF2.85V
26MHz
3
1
OUT VCONT
X601
4
2
26MHz
VCC
ONG
3
1
OUT VCONT
C656
4
2
VCC
ONG
2.2u
C656
2.2u
Figure 8. Schematic of VCTCXO circuit
Figure 8. Schematic of VCTCXO circuit
U605
MIC5255-2.85BM5
5
1
OUT
IN
2
U605
GNO
4
3
MIC5255-2.85BM5
BYP
EN
5
1
C655
OUT
IN
2
0.01u
GNO
4
3
BYP
EN
C655
0.01u
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3. H/W CIRCUIT DESCRIPTION
R617
15K
R617
15K
C667
1000p
C667
1000p
VBAT
VBAT
APC
C559
C660
1u
1000p
APC
(1608)
C559
C660
1u
1000p
(1608)
APC
APC
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