(No.RA070<Rev.001>)1-17
Fig.6 Power supply circuit
2.3.8 Signaling Circuit
2.3.8.1
Encode (QT/DQT/LTR/DTMF/MSK)
Each signaling data signal of QT, DQT, LTR, DTMF and MSK is generated by MPU/DSP (IC401), superposed on a modulation signal
and output to VCO and PLL.
2.3.8.2
Decode (QT/DQT/LTR/DTMF/MSK)
The audio signal and signaling data (QT, DQT, LTR, DTMF and MSK) are separated by MPU/DSP (IC401). Next MPU/DSP (IC401)
decode the signaling data.
2.3.9 Bluetooth/GPS Circuit
The main component of the Bluetooth/GPS circuit is Bluetooth/GPS IC (IC351).
The clocks of Bluetooth/GPS IC require 19.2MHz for core and 32.768kHz slow clock (X351) for UART. 19.2MHz clock (X401) is shared
with the MPU/DSP (IC401), and is supplied through the Clock buffer amplifier (Q401).
Bluetooth/GPS IC communicates to the MPU/DSP (IC401) on the HCI UART. Interface of UART & Digital audio (PCM) between the
MPU/DSP (IC401) and the Bluetooth/GPS IC (IC351), have level conversion at the level conversion IC (IC352, IC353).
The Bluetooth/GPS IC is powered by 1.8V and 3.2V which are supplied from 2 discrete external regulators (IC8 and IC7). The input
of these regulators is sourced from a switching regulator (IC3) which regulates the battery voltage to 3.8V.
Fig.7 Bluetooth/GPS circuit
Q7
F2
(0.5A)
50A
50U
50C
SW
50T
Q4
SB2
8bit ADC
Int AF Amp
TX circuit
ANT SW
VCO
Universal Option
KEY Back Light, 3Color LED,
8bit/16ch ADC
IC17
IC602
IC6
IC201
IC15
53AF
5UC
SBC
ANT SW
TXC
SBC
Ext AF Amp
1.8V
3.2V
OSCILLATOR
32.768kHz
GPS_TX
GPS_RX
MPU/DSP
HPF
Pre-SAW
LNA
Matching
GPS antenna
Q401
X401
Post-SAW
Post-SAW
LNA Supply
LNA Module
TCXO
19.2MHz
Clock
Buffer
Level
Conversion
GPS IC(IC850)
GPS_LNA_IN(L2)
GPS_EXT_LNA_EN(H6)
VDD_TCXO(G1)
TCXO_CLK_LV(F1)
BT_HCI_UART_TX(A4)
BT_HCI_UART_RX(B5)
RTC_CLK(H9)
BTFM_nSHUTDOWN(A6)
GPS PA EN(G3)
VBAT1(A2)
TCXO_LDO_IN(H1)
VDDS
LC filter
BT antenna
BT_RF
IC352,
IC353
IC401
X351
IC351
Содержание NX-3400
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Страница 98: ... No RA070 Rev 001 JKS Printed in Japan JVC KENWOOD Corporation Communications Systems Division ...