Motorola MTP700 Detailed Service Manual page 55

TRANSCEIVER 400 MHz
GCAP3
The Global Control Audio Power (GCAP3) IC handles DC power distribution and audio
processing (ie audio amplification and analog-to-digital/digital-to-analog conversions). It
contains switching and linear regulators, audio preamplifiers, 13-bit CODEC, 14-channel
10-bit A/D Converter, 8-bit D/A Converter and interfaces with an external Audio Amplifier
for receive audio.
DC Power Distribution
See Figure 4.1-11
RAW_B+
RAW_B+
FUSED_B+
FUSED_B+
FUSE
FUSE
MOS_SW
MOS_SW
SOFT_TURN_OFF
SOFT_TURN_OFF
7.2V BATT ERY
7.2V BATT ERY
5.5V LIN REG
5.5V LIN REG
SWB+
SWB+
Several sections of the radio are connected directly to the battery, which supplies RAW_B+ and FUSED_B+.
The radio operates at a low voltage of 5.8Vdc, nominal-level voltage of 7.2Vdc, and high-level voltage of
12Vdc. The battery is connected to J001 pins 3 (+) and J001 pin 1 (-). These pins supply the RAW_B+ to the
RF TX power amplifier and the SWB+ current limit regulator. RAW_B+ is routed via F200 (Fuse) becoming
FUSED_B+, which is used by the Audio PA, the 3.3V Switching Regulator and the SWB+ switch for the TX
Driver bias circuit.
MTP700 Portable Radio / Detailed Service Manual
3.3V SW REG LC Filter
3.3V SW REG LC Filter
LC Filter
LC Filter
Figure 4.1-11 MTP700 DC Distribution
MOS_SW
MOS_SW
MOS_SW
MOS_SW
GCAP 3
GCAP 3
PWM 1
PWM 1
PWM 2
PWM 2
V1 LC Filter
V1 LC Filter
V3_2.775V_DIG
V3_2.775V_DIG
V2
V2
V3 LC Filter
V3 LC Filter
V4 LC Filter
V4 LC Filter
(with Pass
(with Pass
Transistor)
Transistor)
LC Filter
LC Filter
VREF1
VREF1
VREF2 LC Filter
VREF2 LC Filter
VREF2_2.775V_DIG
VREF2_2.775V_DIG
VREF3
VREF3
VIB
VIB
TS-REF
TS-REF
PA_B+
PA_B+
DSC LC Filter
DSC LC Filter
VSIM
VSIM
-
-
TXPA
TXPA
SIDE_CONNECTOR_SWB+
SIDE_CONNECTOR_SWB+
BOTTOM_CONNECTOR_SWB+
BOTTOM_CONNECTOR_SWB+
AUDIO PA
AUDIO PA
PWM1_1.8V
PWM1_1.8V
CORE
CORE
V1_3V
V1_3V
ESCORT / TXVCO
ESCORT / TXVCO
REDCAP, DISPLAY, FLASH, SRAM, I/O-Section
REDCAP, DISPLAY, FLASH, SRAM, I/O-Section
V3_2.775V
V3_2.775V
Serial VCC for WPIC+
Serial VCC for WPIC+
V4_LNODC T
V4_LNODC T
LNODCT
LNODCT
V4_2.775V
V4_2.775V
RFCU, RXU, TXPA, TXFE
RFCU, RXU, TXPA, TXFE
VREF1_2.775V
VREF1_2.775V
AND GATE for TCXO_WARP
AND GATE for TCXO_WARP
VREF2_2.775V
VREF2_2.775V
TX/RX-_LED
TX/RX-_LED
Backlight_LED
Backlight_LED
VTS_2.3V
VTS_2.3V
ADC_INPUT
ADC_INPUT
5V_RF LNODCT_RFOUT, RF PA bias circuit, VCC for
5V_RF LNODCT_RFOUT, RF PA bias circuit, VCC for
Charge Pumps WPIC+, 2ndLO_PLL_IC, ESCORT
Charge Pumps WPIC+, 2ndLO_PLL_IC, ESCORT
5.5V_RF
5.5V_RF
BATTERY_Interface_Circuitry
BATTERY_Interface_Circuitry
TXPA_Driver bias circuit
TXPA_Driver bias circuit
4.1 - 21