Input Pressure (Max) | Output Voltage (Max) | Supply | Frequency Response Deviation | ||
---|---|---|---|---|---|
100dB SPL (2Pa) | 1.228Vrms | Vcc | Vee | 20Hz | 20kHz |
5V | 0V | –0.5dB | –0.1dB |
This circuit uses a non–inverting amplifier circuit configuration to amplify the microphone output signal. This circuit has very good magnitude flatness and exhibits minor frequency response deviations over the audio frequency range. The circuit is designed to be operated from a single 5V supply.
This design procedure uses the microphone specifications provided in the following table.
Microphone Parameter | Value |
---|---|
Sensitivity at 94dB SPL (1Pa) | –35 ± 4dBV |
Current Consumption (Max) | 0.5mA |
Impedance | 2.2kΩ |
Standard Operating Voltage | 2Vdc |
AC Simulation Results
Transient Simulation Results
The input voltage represents the SPL of an input signal to the microphone. A 1Vrms input signal represents 1Pa.
Noise Simulation Results
The following simulation results show 22.39uVrms of noise at 22kHz. The noise is measured at a bandwidth of 22kHz to represent the measured noise using an audio analyzer with the bandwidth set to 22kHz.
Texas Instruments, Simulation for Non-Inverting Microphone Amplifier Circuit, SBOC525 SPICE simulation file
TI Precision Designs Single-Supply, Electret Microphone Preamplifier, TIPD181 reference design
TLV6741 | |
---|---|
Vss | 1.8V to 5.5V |
VinCM | (Vee) to (Vcc –1.2V) |
Vout | Rail–to–rail |
Vos | 150µV |
Iq | 890uA/Ch |
Ib | 10pA |
UGBW | 10MHz |
SR | 4.75V/µs |
#Channels | 1 |
TLV6741 |
OPA320 | |
---|---|
Vss | 1.8V to 5.5V |
VinCM | Rail–to–rail |
Vout | Rail–to–rail |
Vos | 40µV |
Iq | 1.5mA/Ch |
Ib | 0.2pA |
UGBW | 20MHz |
SR | 10V/µs |
#Channels | 1, 2 |
OPA320 |
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