1-20 (No.RA054<Rev.001>)
Fig.4 Power Supply Circuit
54M
12M
31BU
12BU
18M
18M_3
CODEC DVDD
18M
Power management
Sub unit
Module unit
50A
[SBC]
32C
200C
50C
50B
F1
20V DC/DC
54M
SB1
D-sub 15
TX circuit
90C
[SBC]
90ANT
SB2
TX PreDrive(MMIC)
50CT
Sub unit
Audio Power Amp
[TXC]
90T
Antenna switch
IC1
IC16
IC19
3.2V AVR
50AC
[SBC]
[SBC]
+
[ANTSW]
[ASSW]
IC25
5.4V DC/DC
(IC22)
Power management IC
[BAT_CNT]
from
Q15,Q16,D13
5V Reg
IC13
3.1V AVR
BackUp
Battery
IC15
1.2V AVR
IC24
1.2V DC/DC
IC12
DC/DC
1.8V
MPU/DSP I/O(B),DDR
Mobile DDR2,Sub unit
RF Power Module
MPU/DSP PLL
MPU/DSP Core
MPU/DSP RTC
Power management IC
Flash ROMV(I/O) & 3state(512M)
MPU/DSP I/O(A,C) DVDD, USB_VDDA33
Flash ROM, I/O Expander,ADC, CODEC
19.2M TCXO circuit, Uart SW, RS232C
driver, SP GND switch clock, Sub unit
8bit/8ch DAC
12bit/4ch DAC
CODEC AVDD,DRVDD
I/O Expander, D-sub level shift.
8bit/16ch ADC AVCC
OPamp for VREF/25REF
MPU/DSP USB_VBUS
SP GND switch driver
Sub unit
D-sub 15
VCO Assist
Direct Conversion Transceiver
RF Detector / Controller
IC21
DC SW
32A
32M
3.2V AVR
IC20
32A
32M
IC17
3.2V AVR
32M
IC26
5V AVR
IC609
5V AVR
IC23
5V AVR
IC14
F4
F5
Q12, Q13
DC SW
Q17, Q18
DC SW
5V AVR
Q206
Q 20, Q 23
DC SW
DC SW
Q 21, Q 22
DC SW
9V AVR
Summary of Contents for NX-3720
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