Motorola ASTRO XTS 2500 Service Manual page 8

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4.2.6.2.1 MAKO IC (U701)................................................................................................. 4.2-10
4.2.6.2.2 Regulator ............................................................................................................ 4.2-11
4.2.6.2.3 Audio Pre-Amplifier ............................................................................................. 4.2-11
4.2.6.2.4 Audio Power Amplifier......................................................................................... 4.2-11
4.2.6.3 Interface Support Section ............................................................................................ 4.2-12
4.2.6.3.1 MAKO IC U701 ................................................................................................... 4.2-12
4.2.6.3.2 ESD Protection Circuitry ..................................................................................... 4.2-13
4.2.6.3.3 Universal Connector (Side Connector) Interface Circuitry .................................. 4.2-13
4.2.6.3.4 The Option Board................................................................................................ 4.2-15
4.2.6.3.5 Encryption Module .............................................................................................. 4.2-16
4.2.6.3.6 System Clocks .................................................................................................... 4.2-17
4.2.6.4 Transmit Audio Path .................................................................................................... 4.2-17
4.2.6.5 Receive Audio Path ..................................................................................................... 4.2-18
Chapter 4.3 UHF2 Detailed Theories of Operation ............................ 4.3-1
4.3.1 Introduction................................................................................................................................ 4.3-1
4.3.2 Frequency Synthesis ................................................................................................................. 4.3-1
4.3.3 Antenna Switch.......................................................................................................................... 4.3-2
4.3.4 Receiver .................................................................................................................................... 4.3-3
4.3.4.1 Front End ....................................................................................................................... 4.3-3
4.3.4.2 Back End........................................................................................................................ 4.3-4
4.3.5 Transmitter ................................................................................................................................ 4.3-4
4.3.6 VOCON Functional Blocks ........................................................................................................ 4.3-5
4.3.6.1 Controller and Memory Section ..................................................................................... 4.3-5
4.3.6.1.1 Patriot IC (U800) ................................................................................................... 4.3-5
4.3.6.1.2 SRAM (U804)........................................................................................................ 4.3-8
4.3.6.1.3 Flash Memory (U803) ........................................................................................... 4.3-8
4.3.6.2 Audio and Power Section............................................................................................. 4.3-10
4.3.6.2.1 MAKO IC (U701)................................................................................................. 4.3-10
4.3.6.2.2 Regulator ............................................................................................................ 4.3-11
4.3.6.2.3 Audio Pre-Amplifier ............................................................................................. 4.3-11
4.3.6.2.4 Audio Power Amplifier......................................................................................... 4.3-11
4.3.6.3 Interface Support Section ............................................................................................ 4.3-12
4.3.6.3.1 MAKO IC U701 ................................................................................................... 4.3-12
4.3.6.3.2 ESD Protection Circuitry ..................................................................................... 4.3-13
4.3.6.3.3 Universal Connector (Side Connector) Interface Circuitry .................................. 4.3-13
4.3.6.3.4 The Option Board................................................................................................ 4.3-15
4.3.6.3.5 Encryption Module .............................................................................................. 4.3-16
4.3.6.3.6 System Clocks .................................................................................................... 4.3-17
4.3.6.4 Transmit Audio Path .................................................................................................... 4.3-17
4.3.6.5 Receive Audio Path ..................................................................................................... 4.3-18
Chapter 4.4 700/800 MHz Detailed Theories of Operation ................ 4.4-1
4.4.1 Introduction................................................................................................................................ 4.4-1
4.4.2 Frequency Synthesis ................................................................................................................. 4.4-1
4.4.3 Antenna Switch.......................................................................................................................... 4.4-2
4.4.4 Receiver .................................................................................................................................... 4.4-3
4.4.4.1 Front End ....................................................................................................................... 4.4-3
4.4.4.2 Back End........................................................................................................................ 4.4-4
4.4.5 Transmitter ................................................................................................................................ 4.4-4
August 16, 2007
Table of Contents
6816985H01-B