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SGM4826
Single/Dual-Input, Fixed-Gain Microphone Amplifier with Integrated Bias
Single/Dual-Input, Fixed-Gain Microphone Amplifier with Integrated Bias
GENERAL DESCRIPTION

The SGM4822/SGM4825 (single-input) and SGM4823/SGM4826 (dual-input) are low noise, low power, rail-to-rail, fixed-gain microphone amplifiers with integrated bias. The SGM4822/SGM4823 support power supply voltage from 3.3V to 5.5V and the SGM4825/SGM4826 support wide power supply voltage from 2.7V to 5.5V. The devices are suitable for portable audio applications. They feature low THD+N = 0.009% in active mode, 2.6MHz bandwidth and forced shutdown mode.

The SGM4822/SGM4823 power-saving features include automatic switching between low power monitor mode and low noise active mode, and the devices also provide latched push-pull output to wake up external MCU in sleeping mode. Two inputs of the SGM4823/SGM4826 allow two microphones to be multiplexed into one output.

The devices operate over an ambient temperature range of -40 to +85.

PIN CONFIGURATIONS

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FEATURES
  • Very Low Noise: 30nV/√Hz at 1kHz, Gain = 20dB

  • Very Low THD+N: 0.009%, Gain = 20dB

  • Wide Supply Voltage Range: 2.7V to 5.5V

  • Low Quiescent Current:

    4μA in Monitor Mode at VCC = 3.3V

    660μA in Active Mode

  • Low Noise Microphone Bias Voltage: 2.3V

  • Rail-to-Rail Outputs

  • 20dB Fixed-Gain

  • -40 to +85 Operating Temperature Range

APPLICATIONS

Laptop Computers

Smart Phones

Digital Cameras

VCRs

ORDERING INFORMATION
Part Number Status Package Pins Pb-Free Temp Range
SGM4826B-23YN8G/TR Production SOT-23-8 8 Y -40℃ to +85℃ Samples