INA1650 datasheet(28/41 Pages) TI1

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12 V

10 F

C7 1 F

C6 0.1 F

10 F

C5 1 F

IN- A

IN+ A

VCC

OUT A

VMID(OUT)

COM A

IN+ B

IN- B

COM B

OUT B

VMID(IN)

VEE

REF A

REF B

INA1650-Q1

Microphone

RBIAS

Microphone

RBIAS

VBIAS

150 nF

100

10 k

C10

150 nF

C11

150 nF

10 k

Speech-Filtered,

Single-Ended Audio

Signals

100

INA1650-Q1, INA1651-Q1

SBOS772B – AUGUST 2017 – REVISED APRIL 2019

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Product Folder Links: INA1650-Q1 INA1651-Q1

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Typical Applications (continued)

8.2.2 Two-Channel Microphone Input for Automotive Infotainment Systems

The high CMRR, low-noise, and ease-of-use in single supply applications make the INA165x-Q1 an excellent

choice for applications in automotive infotainment systems. illustrates a high-CMRR input circuit for in-cabin

microphones used for hands-free phone systems. The microphones are connected with matched bias resistors,

RBIAS, to preserve the high-CMRR performance of the INA165x-Q1. The exact value of the microphone bias

voltage, VBIAS, and the RBIAS resistors depends on the particular microphones used. Bandwidth-limiting the audio

signal to the range of frequencies for speech is common in hands-free systems. As shown in , all filtering

components are placed at the output of the INA165x-Q1 rather than the input to preserve high CMRR. The

values shown in limit the signal bandwidth to approximately 100 Hz to 10 kHz.

Figure 60. Two-channel Microphone Input for Automotive Infotainment Systems

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