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3. TECHNICAL BRIEF
3.4 13 MHz Clock
The 13 MHz clock (VC-TCXO-208C) consists of a TCXO (Temperature Compensated Crystal
Oscillator) which oscillates at a frequency of 13 MHz.
It is used within the CX74017 RF Main Chip, BB Analog chip-set (AD6521), and Digital (AD6522).
3.5 Power Supplies and Control Signals
There are two regulators used in the phone to provide RF power. One is contained inside of
ADP3408 (U101), power management IC to provide the power for the VCTXO (X302). The other is
used to provide the power for remaining RF circuits.
Regulator
Regulator 1
(U1, 2V7_VTCXO)
Regulator 2
(U414, RF2V8)
.
Figure 3-4. VCTCXO Circuit.
Table 3-2.
Voltage
2.7 V
0.5 V
VCTXO
2.85 V
0.5 V
RF circuitry
Figure 3-5. Regulator Circuit.
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