Advertisement
Figure 11. DC Power Distribution Diagram
Audio Circuitry
Audio circuitry consists primarily of the audio amplifiers and coder/decoder
(CODEC) integrated in GCAP II IC. Its purpose is the future support of voice.
24
RAW_B+
Fuse
Fused_B+
Filt_B+
Filter
LOGIC BOARD
RF BOARD
Filt_B+
Fused_B+
Raw_B+
THEORY OF OPERATION: Audio Circuitry
GCAP II
LINEAR REG. V2;
2.775V, 200mA
GCAP II
LINEAR REG. V1;
2.775V, 60mA
GCAP II
LINEAR REG. V3;
1.875V, 120mA
LM2981;
3.0V, 100mA
GCAP II Vref;
(tracks V2)
2.775V, 5mA
Super Filter;
2.775V, 30mA
Vcc2
LM2664;
2.775V Inverter
Drain Switch
Raw_B+
Clock Buffers, Low
Vcc5
Volt. Comparator
FLASH, SRAM
Vcc4
Ext. Memory Bus,
SPI and ESSI Ports
Vcc3
REDCAP
DSP & MCU CORE
Redcap QVccH,
Vcc1
Accessory Vdd
Opt_B+
(to Accessory Connector)
VREF
Vcc2
Vcc2
ODCT
Vcc6
iZIF, LVFrac-N,
Mixer, VCO,
ADDAG
Neg_sup
RF PA BIAS
RF PA
ODCT Up-mixer
Advertisement
