SGM4822.pdf
No.11276
● Very Low Noise: 30nV/Hz at 1kHz, Gain = 20dB
● Very Low THD+N: 0.009%, Gain = 20dB
● Wide Supply Voltage Range:
3.3V to 5.5V (SGM4822/SGM4823)
● Low Quiescent Current:
100nA at Forced Shutdown Mode
5μA at Monitor Mode (SGM4822/SGM4823)
0.66mA at Active Mode
● Low-Noise Microphone Bias Voltage: 2.3V
● Rail-to-Rail Outputs
● 20dB Fixed-Gain
● Automatic Switching Between Low Power Monitor Mode and
Low Noise Active Mode (SGM4822/SGM4823)
● Latched Push-Pull Output to Wake up External MCU in
Sleeping Mode (SGM4822/SGM4823)
● -40℃ to +85℃ Operating Temperature Range
The SGM4822/SGM4825 (single-input) and SGM4823/ SGM4826 (dual-input) are low noise, low power, fixed- gain microphone amplifiers. They offer tiny packaging and a low noise, integrated microphone bias, making them ideal for portable audio applications such as notebook computers, smart phones, and digital cameras. These amplifiers feature a 2.6MHz bandwidth, rail-to-rail outputs, an industry-leading and a very low 0.009% THD+N in active mode, forced shutdown mode that cuts the combined supply and bias currents to only 100nA. The SGM4822/SGM4823 power-saving features include automatic switching between low power monitor mode and low noise active mode, and also provide latched push-pull output to wake up external MCU in sleeping mode.
The SGM4823 and SGM4826 have two inputs allowing two microphones to be multiplexed to a single output.
