(No.RA077<Rev.001>)1-11
2.3.7 Power Supply Circuit
The battery voltage (+B) is provided from battery terminal. The battery voltage passes through the 3.15A fuse (F400), and goes to
RF Drive and final amplifier, DC/DC converter (IC407), AF amplifier (IC300 through the 1.0A fuse (F300)), and INT DET IC (IC406).
IC406 monitors battery voltage. If the battery voltage is enough higher than 5.6V, IC406 outputs "High".
When the Power SW is turned on, SB becomes "High" (battery voltage). DC/DC (IC408) operates if both SB and IC406 output are
"High". IC407 (38M) outputs 3.8V, and IC404 (32M) outputs 3.2V. IC408 (32MD) outputs 3.2V. IC203 (32B) outputs 3.2V. Reset IC
(IC405) watches IC408 (32MD) output voltage. If the 32MD output voltage is enough higher than 2.8V, Reset IC (IC405) outputs
"High". As a result, MPU/DSP (IC501) operates.
SBC signal becomes "High" after MPU/DSP (IC501) operates, and IC400 (50M), IC401 (50C), IC403 (32C), and IC1 (32MS) are
turned on.
When 50VC signal becomes "High", IC402 (50V) operates. When 5TC signal becomes "High", Q400 (50T) is turned on. Q400 (50T)
is turned on in transmit mode. Switches are controlled by MPU/DSP (IC501).
When the Power SW is turned off, /SB_DET signal becomes "High". After detecting /SB_DET signal, MPU/DSP (IC501) changes SBC
signal to "Low".
38M is fed to IC3 (200C). IC3 (200C) is the DC/DC boost converter. IC3, D1, C34 consist of a voltage quadrupler.
The 200C circuit then outputs approxi20VDC.
Fig.5 Power Supply Circuit
2.3.8 Signaling Circuit
2.3.8.1
Encode (QT/DQT/DTMF/2-tone/MSK)
Each signaling data signal of QT, DQT, DTMF, 2-tone and MSK is generated by the MPU/DSP (IC501), superposed on a modulation
signal and output to VCO and PLL.
2.3.8.2
Decode (QT/DQT/DTMF/2-tone/MSK)
The audio signal and signaling data (QT, DQT, DTMF, 2-tone and MSK) are separated by the MPU/DSP (IC501). Next the MPU/DSP
(IC501) decode the signaling data.
F400
+B
BATT
GND
IC400
50M
SBC
Q400
50T
5TC
IC402
50VC
50V
IC401
32CC
50C
IC406
INT
IC407
DC/DC
IC404
32M
SBC/PWR
SBC/PWR
IC408
DC/DC
SBC/PWR
32MD
IC405
RESET
RESET
IC1
32MSC
32MS
IC203
32B
IC403
32CC
32C
200C
IC501
5TC
32CC
50VC
SBC
32MC
Power SW
D401
INT
SBC/PWR
DC SW
AVR
AVR
AVR
INT DET
AVR
AVR
AVR
AVR
MPU/DSP
IC3
DC/DC
D402
DC SW
SB
38M
/SB_DET
Содержание NX-1200 Series
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