MAX9812-dat
Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias
datasheet - Maxim Integrated
Available in Two Versions
- MAX9812L/MAX9813L—2.7V to 3.6V
- MAX9812H/MAX9813H—4.5V to 5.5V
The MAX9812 is a single amplifier in a 6-pin SC70 package (2mm x 2.1mm) and the MAX9813 is a dual- input amplifier available in an 8-pin SOT23 (3mm x 3mm) package.
The MAX9813 has two inputs allowing two microphones to be multiplexed to a single output.
The MAX9812/MAX9813 are offered in two grades. The MAX9812L/MAX9813L are optimized for 3.3V supply operation (2.7V to 3.6V).
The MAX9812H/MAX9813H are PC2001 compliant and are optimized for 5V operation (4.5V to 5.5V). Both devices are specified over the -40°C to +85°C extended operating temperature range.
Typical Operating Circuits
MAX9812
MAX9813
arduino connection
demo code
simply run with analog read
const int sensorPIN = A0;
const int sampleWindow = 50; // Window width in mS (50 mS = 20Hz)
void setup()
{
Serial.begin(9600);
}
void loop()
{
unsigned long startMillis= millis();
unsigned int signalMax = 0;
unsigned int signalMin = 1024;
// Collect during window
unsigned int sample;
while (millis() - startMillis < sampleWindow)
{
sample = analogRead(sensorPIN);
if (sample < 1024)
{
if (sample > signalMax)
{
signalMax = sample; // Update maximum
}
else if (sample < signalMin)
{
signalMin = sample; // Update minimum
}
}
}
unsigned int peakToPeak = signalMax - signalMin; // Sound amplitude
double volts = (peakToPeak * 5.0) / 1024; // Convert to voltage
Serial.println(volts);
}