Rainbow Electronics MG260 - Manual (Page 44)

MG260 Product Specification
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Signal Pin# I/O I/O type Description
MIC1P 62 I Analog Microphone 1 positive input
MIC1N 64 I Analog Microphone 1 negative input
2.6.6.1.3 Auxiliary Microphone Inputs (MIC1)
MIC1 inputs do not include internal bias, making these inputs the standard
ones for an external headset or a hands-free kit, connected either in
differential or single-ended mode.
Note: to get a good TDMA noise filtering for the biasing of
MIC1, a recommended solution is the use of an external supply instead of
using VCC (pin60) provided by the MG260 module.
To use these inputs with an electret microphone, bias has to be generated
outside the MG260 module according to the characteristics of this electret
microphone.
AC coupling is already embedded in the odule.
Pin description
2.6.6.2 Speaker outputs
2.6.6.2.1 General description
These outputs are differential and the output power can be adjusted by step of
2 dB.
Outputs can be directly connected to a speaker.
The gain of the speaker outputs is internally adjusted and can be tuned using
an AT command (refer to AT commands documentation [4]).
2.6.6.2.2 Main Speaker Outputs (SPK2)
Pin description
Signal Pin # I/O I/O type Description
SPK2P 65 O Analog Speaker 2 positive output
SPK2N 67 O Analog Speaker 2 negative output
2.6.6.2.3 Auxiliary Speaker Outputs (SPK1)
Pin description
Signal Pin # I/O I/O type Description
SPK1P 61 O Analog Speaker 1 positive output
SPK1N 63 O Analog Speaker 1 negative output