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Hardware Description
3.7.5
Digital Audio Interface
Digital audio signals can be used as general-purpose I/Os when the digital audio interface is not needed. Table 12 lists the c18
digital audio interface signals.
Digital audio is hardware supported.
Note
3.8
ANTENNA
This section describes the available RF antenna connectors and their requirements.
3.8.1
RF Connectors
Two female MMCX antenna connectors are provided for RF input/output in the c18 module:
• Cellular Bands Antenna Connector (J31)
• GPS Antenna Connector (J30)
Both RF connectors (J30 and J31) are 50-ohm connectors with VSWR less than 2:1. Figure 18 shows the c18 module's antenna
connectors.
There are three supported antenna port configurations, as follows:
• A single-port solution that supports CDMA1X/AMPS/GPS bands (with a passive antenna) using the J31 connector.
• A single-port solution that supports CDMA1X/AMPS bands only using the J31 connector.
• A dual-port solution in which the J31 connector is used to support CDMA1X/AMPS only, and the J30 connector is used to
support the GPS band (with an active or passive antenna).
32
Table 12. Digital Audio Interface Signals
Signal Name
PCM_DIN_GPIO1
PCM_DOUT_GPIO2
PCM_CLK_GPIO3
PCM_FS_GPIO4
70-pin Connector
Pin Number
18
PCM input to c18
20
PCM output from c18
22
PCM Clock signal
24
PCM Sync signal
Description
98-08901C63-A
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