Table of Contents
Advertisement
5.7.2 Audio From Mobile Station - AFMS
LZT 123 7589 R1A
5. SYSTEM CONNECTOR INTERFACE
The following tables show the nominal PGA (programming gain settings).
For more information see the relevant AT commands.
Maximum input voltage limit: 245 mV
Input
Input (mV
rms
ATMS
245
Maximum input level at MICI, 61.4 mV
PCMOUT = 3 dBm0
Input
Differential
input (mV
rms
MICN
61.4
MICP
Output at AFMS for 3 dBm0 at PCMIN
Input
dBm0
PCMIN
3
Output at BEARN/BEARP for 3 dBm0 at PCMIN
Input
dBm0
PCMIN
3
AFMS is the analogue audio output from the radio device and may be used
to drive a speaker or the ear-piece in a car kit.
PCM digital audio signals, entering the radio device through the PCMIN
pin, are translated to analogue signals by the CODEC. See 5.8 PCM Digital
Audio, page 33 for further information.
The table below shows the audio signal levels for AFMS.
Parameter
Speaker impedance
rms
)
TXAGC (dB)
AUX AMP
gain
0
13
rms
TXAGC (dB)
AUX AMP
)
gain
0
25
RXPGA
Volume
control (dB)
0
0
RXPGA
Volume
control (dB)
0
0
PCMOUT (dBm0)
3
output at
PCMOUT (dBm0)
3
AFMS (mV
436
BEAR (mV
388
Limit
64 to 1 k
)
rms
)
rms
30
Advertisement
Table of Contents
