BU26154MUV_15 Datasheet, PDF (31/90 Pages) Rohm – Monaural Audio CODEC with Touch Panel Interface

BU26154MUV
Datasheet
Microphone amplifier
The microphone input can support two modes, a single-end and differential. When using it in single-end input, it writes "0" in
the MINDIF bit of the MIC Interface Control register. When using differential input, it writes "1".
In the case of single-end input, it can input from MINP pin or MINN pin. Please set of the input pin in MIC Select Control
Register.
Microphone bias
The Case of using Microphone bias, it shows a recommended connection diagram. By all means, please connect a
condenser (2.2uF at the minimum) to MBIASCAP outside pin. On this occasion, the LSI can improve noise characteristics
by connecting the option resistance on the chart below (the optional resistance is up to 50 Ω).
MicBiasAmplifier
BU26154
option
MBIASCAP
2.2uF
Figure 36
In addition, according to the capacity of the outside condenser, it is necessary to wait until microphone bias is stable.
In waiting time of MICBIAS, please set the value of the MICTIME bit at the MIC Input Charging Time register.
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26.Oct.2015 Rev.002