Digital PDM Output MEMS Microphone Signal Conditioning Chip
The NSC6362 is a PDM output preamplifier for MEMS digital microphones. The chip integrates a low noise bias circuit for MEMS microphones and a high-performance analog pre-amplifier circuit to provide high quality audio signal output and high flexibility for MEMS microphones. The built-in OTP is adjustable for bias voltage and gain, so the NSC6362 supports MEMS microphone sensors with different parameters for better sensitivity consistency. Customers can integrate the chip into the MEMS digital microphone chip for audio signal conditioning. The NSC6362 chip has an extremely low startup and wake time of 20ms, programmable gain, bias voltage and left and right channel polarity. The NSC6362 supports dynamic current adjustment based on the input clock frequency, so it can be used in different power modes. The operating voltage of the chip ranges from 1.62V to 3.6V, and its operating modes include sleep mode, low voltage mode and normal mode.
Product Features
• Working voltage: 1.62V～3.6V
• Working mode: sleep mode, low voltage mode, and normal mode
• Current drain: 330μA @768kHz, 770uA@2.4MHz
• Equivalent input noise: 3μVrms（-110dBV）
• Gain adjustment (OTP): 0dB～23dBFS with 0.5dB／Step
• Bias voltage: 7V～18V with 0.3V／Step
• Working temperature: -40℃～85℃
Application
• Laptop
• Cellphone
• Smart speaker
Functional Block Diagram
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