THEORY OF OPERATION: Digital Section
26
Audio Amplifier Outputs
The following table lists the audio amplifier outputs and the devices that each out-
put controls.
Digital Section
This section includes the REDCAP, which controls the transmit, receive, and syn-
thesize operations of the integrated circuits located in the RF section. Within the
REDCAP is the DSP and the serial communication interface.
The digital section contains the following (Figure 13):
¥
REDCAP
¥
Power On/Off circuitry
¥
Serial peripheral interface (SPI)
¥
Host memories (flash and SRAM)
¥
Accessory Connector
¥
GCAP II and its circuitry
¥
60-pin interface connector to the main board
Table 1. Audio Amplifier Outputs
Device
Outputs
Not used
A1
Not used
A4
Not used
A3
External microphone
A5
Externl audio out
A4
