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2. SYSTEM CONNECTOR INTERFACE
49
LZT 123 7263 R1C
The following tables show the nominal PGA (programming gain
settings). For more information see the relevant AT commands.
Maximum input voltage limit: 245mV
rms
Maximum input level at MICI, 61.4mV
rms
output at
PCMOUT = 3dBm0
Output at AFMS for 3dBm0 at PCMIN
Output at BEARN/BEARP for 3dBm0 at PCMIN
2.6.2 Audio From Mobile Station - AFMS
AFMS is the analogue audio output from the module and may be used
to drive a speaker or the ear-piece in a portable hands-free accessory.
PCM digital audio signals, entering the module through the PCMIN pin,
are translated to analogue signals by the CODEC. See “2.7 PCM Digital
Audio”, page 52 for further information.
High frequency cut-off (–3dB) > 3500Hz ± 50Hz
Output d.c. bias level
Hands-free mode 0V
Portable hands-free mode 2.0V ± 0.1V
Additional Gain in Portable hands-free mode 28.5dB
a. The a.c.-coupling capacitance must be supplied by your application, unless
a d.c.-coupled microphone is used.
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