User Manual

5. SYSTEM CONNECTOR INTERFACE
30
LZT 123 7589 R1A
The following tables show the nominal PGA (programming gain settings).
For more information see the relevant AT commands.
Maximum input voltage limit: 245 mV
rms
Maximum input level at MICI, 61.4 mV
rms
output at
PCMOUT = 3 dBm0
Output at AFMS for 3 dBm0 at PCMIN
Output at BEARN/BEARP for 3 dBm0 at PCMIN
5.7.2 Audio From Mobile Station - AFMS
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.
Input Input (mV
rms
) TXAGC (dB) AUX AMP
gain
PCMOUT (dBm0)
ATMS 245 0 13 3
Input Differential
input (mV
rms
)
TXAGC (dB) AUX AMP
gain
PCMOUT (dBm0)
MICN
MICP
61.4 0 25 3
Input dBm0 RXPGA Volume
control (dB)
AFMS (mV
rms
)
PCMIN 3 0 0 436
Input dBm0 RXPGA Volume
control (dB)
BEAR (mV
rms
)
PCMIN 3 0 0 388
Parameter Limit
Speaker impedance 64 Ω to 1 kΩ