Vocon Board; Figure 3-7. Vocon Board Interconnections - Motorola ASTRO XTS 5000 Detailed Service Manual

3-16
Transistors Q307 and Q310 form a 3.3 Vdc-to-5 Vdc logic-level shifter for the signal from the FracN
AUX3 pin to the VCOBIC.
3.2

VOCON Board

This section provides a detailed circuit description of the ASTRO XTS 5000 VOCON board.
The VOCON board
• Controller and Memory
• Audio and Power
• Interface Support
3.2.1 Interconnections
The VOCON board interconnection diagram (see
five connector symbols.
RF
26 pins
Universal
40 pins
The functional blocks consist of the following:
• Controller and Memory: The Patriot (U401), the dual-core processor with the microcontroller
unit (MCU) and a digital signal processor (DSP), the SRAM (U403) and Flash (U402) memory
devices.
• Audio and Power: The GCAP II (U501), a 5 Vdc linear regulator (U505), a 1.55 Vdc linear
regulator (NNTN4717 VOCON kit only), the audio pre-amplifier (U502), the audio power
amplifier (U503), and the dual EEPOT (U509).
• Interface Support: The digital-support IC Flipper (U301), ESD protection circuitry, and side
connector interface circuitry.
July 21, 2004
(Figure 3-7) is divided into the following sections:
INTERFACE SUPPORT
ESD Protection and
Clocks and Side
Side Connector
Connector Support
Circuitry
AUDIO AND POWER
Audio
EEPOT
Pre-amp and
Power Amp
GCAP II
and Discrete
Voltage Regulators

Figure 3-7. VOCON Board Interconnections

Theory of Operation
Figure 3-7) contains three functional blocks and
ASIC
CONTROLLER AND MEMORY
FLASH
8MBytes
Dual-Core
Processor
MCU and DSP
SRAM
1MByte
: VOCON Board
VOCON
Board
Keypad
22 pins
Display
22 pins
Encryption
40 pins
MAEPF-27413-A
6881094C31-D