Frye FONIX 8000 - Circuit Block Diagrams; Daughter Board Block Diagram

Chapter 4: 17
4.3 Circuit Block Diagrams
4.3.1 Daughter Board Block Diagram
8000 Circuit Description
2010-10-27
Page 3 of 14
Daughter Board Block Diagram
CPU JTAG
Connector
J1
CPU U1
SPI
RS232
ADC2-9
ADC0
ADC
12&13
ADC1
Internal
Keyboard
Connector
J2
Key Matrix
to Voltage
Converter
PC104
Connector
J4
Buss
Interface
CPLD
U5
UART
U17
RS232
Interface
U2 & U18
Audio
Connector
from SBC
J3
LOUT L&R
Mic In
LIN L&R
Source
Re-reference
circuit U3&U4
2XRS232 Ext
Keyboard
Source A&B
34 pin connector to
ConnectorBoard J5
Voice Mic In
Speaker Return
Lines
Line In L&R
Mic 1A, 1B, 2A, 2B
Dual
UART
U6
Mic/Line Mux
U10A&B
Mic
Mux
U7
ChanA 24dB
prescaler
U8A, U12A
ChanA 12dB
Attenuator
U12B, U8B
ChanA ANSI
Equalizer
U11A, U12C
ChanA
AntiAlias Filter
U11B
ChanB 24dB
prescaler
U9A, U14A
ChanB 12dB
Attenuator
U14B, U9B
ChanB ANSI
Equalizer
U13A, U14C
ChanB
AntiAlias Filter
U13B
Shift Register
U28
8 outputs
Speaker
Current
Sense
U16A&B
Resistor dividers for
+/-15V, +12V, +/-10V,
+/-8V, and +5V supplies
CPLD JTAG
Connector
J6
Voltage Regulators
+12V U24, +3.3 U20,
+10V U25, -10V U22,
+8V U23, -8V U21
Connector from
Offline switcher
J7
+/-15V & +5V
Connector to
SBC J8
+5V & +12V