Product Info

Smart Module Series
SC200R Series Hardware Design
SC200R_Series_Hardware_Design 67 / 125
 The module offers three audio input channels, including three single-ended channels.
 The output voltage range of the two MIC_BIAS is programmable between 1.6 V and 2.85 V, and the
maximum output current is 3 mA.
 The earpiece interface uses differential output.
 The loudspeaker interface uses differential output as well. The output channel is available with a
Class-D amplifier whose output power is 1362 mW when the load is 8 Ω.
 The headphone interface features stereo left and right channel output, and supports headphone
insertion detect.
3.22.1. Reference Circuit Design for Microphone Interfaces
Figure 23: Reference Circuit Design for ECM Microphone Interface
MIC3_P 148 AI Secondary microphone input (+)
MIC_BIAS1 147 AO Microphone bias voltage 1 V
O
= 1.6–2.85 V
EAR_P 8 AO Earpiece output (+)
EAR_N 9 AO Earpiece output (-)
SPK_P 10 AO Speaker output (+)
SPK_N 11 AO Speaker output (-)
HPH_R 136 AO Headphone right channel output
HPH_REF 137 AO Headphone reference ground
HPH_L 138 AO Headphone left channel output
HS_DET 139 AI Headset insertion detect High level by default.