Introduction

The MAX9860 provides the system modules and performance required for Skype voice acquisition, with any gain between 0dB and 50dB (1dB steps) between the microphone input pin and the internal analog-to-digital converter (ADC) (Figure 1). The output stage of the ADC can select an additional gain of -12dB to +3dB. The device's digital audio interface outputs conform to standard I2S, left-justified, or TDM protocols for communication between system application processors. All settings are programmed via a 2-wire I2C compatible interface.

Figure 1. MAX9860 block diagram, ADC path.

Figure 1. MAX9860 block diagram, ADC path.

Recommended microphone preamplifier circuit

For Skype applications, it is recommended to use an additional level of preamplifier before the MAX9860 analog input to ensure adequate gain. A single-supply, dual-channel, low-noise operational amplifier such as the MAX4253 can be used. It is critical to ensure that the signal-to-noise ratio (SNR) of the external op amp is greater than the SNR of the MAX9860, which results in better overall SNR performance. An external op amp circuit can also be used as a low-pass filter to reject high frequency noise.

There are two recommended microphone configurations for the remote Skype system: four microphone arrays and two microphone arrays. Figures 2 and 3 show the recommended input schematics for four microphone arrays. When using two microphone arrays, remove MK3, MK4, FB3, FB4, C101, C102, R91, and R101, and change R41 and R42 to 0Ω. Figure 4 and Figure 5 show the recommended input schematics for using two microphone arrays.

Figure 2. Four-way microphone input circuit.

IMG_20181205_181017

Cable Spec UL 2464 22AWG of cable 
temputer of cable 80°C
Voltage 300V
Color  Black
Length  1500mm or option
Plug  OBD plug
DC connector Female DC 5.5x2.5mm
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