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MODULAR UNIT (X14-9790-10/2-71)
Ref. No.
Application / Function
USB Main µ-com
IC1
IC2
PLL (16.898MHz)
IC13
OPAMP
IC14
A5V Reg.
IC15
DSP
IC16
SDRAM
IC17
Flash ROM
IC18
24 bit D/A converter
IC20
1.8V Reg.
IC25
USB Host Controller
IC26
Logic IC (NAND)
IC28
Dual bus buffer
IC201
ISO AMP
IC202
ISO AMP
IC203
ISO AMP
IC204
Switch OPAMP
IC205
OPAMP
IC401
FM-TX IC
IC402,403
Level shift
IC404
OPAMP
IC501
BU3.3V Reg.
IC502
Audio8V Ref Power Supply
IC511,512
Level shift
System µ-com
IC601
IC602
Reset IC
IC901
Switching Regulator Controller
IC951
Power control IC
Q16
Infinite zero detect SW
Q17
SW of "USB Hi-Side SW"
Q18
DAC MUTE SW
Q250~252 MUTE 0 SW
Q401,402
PLL+B AVR
Q403,404
Switching FM-TX frequency polarization
Q405,406
For FM-TX PLL
Q407
RELAY SW
Q408
Buffer
Q409~412 BEEP LEVEL SW
Q413
PLL MUTE SW
Q501
B.U Detect SW
COMPONENTS DESCRIPTION
For IC15
Low Pass Filter
For IC18
For compression audio decoding
For compression audio deployment
Decoder software storing
For IC15
The change of IC15, and IC16/IC17/IC25
The change of the clock supplied to IC16
Audio input isolation amplifier (5L)
Audio input isolation amplifier (AUX1/RCA)
Audio input isolation amplifier (AUX2/Mini Jack)
4 inputs (USB, 5L, AUX1, AUX2), 1 output
Buffer
FM-Transmiter
3.3V → 5V
Mix Amp
For IC1, IC601
Output 1.27V
3.3V → 5V
"L" when detection voltage goes below 3.0V or less
Power Supply for USB3.3V & USB 5V. CH1: USB3.3V, CH2: USB5V
USB power control switches with over current detection and protection
When a base gose Lo, SW turns on
When a base gose Lo, SW turns on
When a base gose Hi, DAC MUTE turns on
When Q250's base goes Lo, MUTE 0 turns on
When Q402's base goes Hi, AVR outputs 5V
Switches FM-TX freqency polarization in three level at Q403, 404 and their peripherals
Composes PLL of FM-TX with Q405, 406 and their peripherals
When a base gose Hi, the output from IC401 is chosen
For RDS signals
Switches BEEP VOLUME in five level
When a base gose Hi, PLL MUTE turns off
When a base gose Hi, B.U voltage is detected
KOS-A200
Operation / Condition / Compatibility
3
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