MAX9814 データシートの表示（PDF） - Maxim Integrated

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MAX9814

Microphone Amplifier with AGC and Low-Noise Microphone Bias

Maxim Integrated 

Microphone Amplifier with AGC and

Low-Noise Microphone Bias

Typical Operating Characteristics (continued)

(VDD = 5V, CCT = 470nF, CCG = 2.2µF, VTH = VMICBIAS x 0.4, GAIN = VDD (40dB), AGC disabled, no load, RL = 10kΩ, COUT = 1µF,

TA = +25°C, unless otherwise noted.)

HOLD AND RELEASE TIME

HOLD AND RELEASE TIME

VMICOUT

500mV/div

VMICOUT

500mV/div

0V

CCT = 47nF

A/R = VDD

40ms/div

0V

CCT = 47nF

A/R = UNCONNECTED

100ms/div

Pin Description

PIN

TDFN

1

2

3

4, 11

5

6

7

8

9

10

12

13

14

—

NAME

FUNCTION

CT

SHDN

CG

N.C.

VDD

MICOUT

GND

MICIN

A/R

GAIN

BIAS

MICBIAS

TH

EP

Timing Capacitor Connection. Connect a capacitor to CT to control the Attack and Release times

of the AGC.

Active-Low Shutdown Control

Amplifier DC Offset Adjust. Connect a 2.2µF capacitor to GND to ensure zero offset at the output.

No Connection. Connect to GND.

Power Supply. Bypass to GND with a 1µF capacitor.

Amplifier Output

Ground

Microphone Noninverting Input

Tri-Level Attack and Release Ratio Select. Controls the ratio of attack time to release time for the

AGC circuit.

A/R = GND: Attack/Release Ratio is 1:500

A/R = VDD: Attack/Release Ratio is 1:2000

A/R = Unconnected: Attack/Release Ratio is 1:4000

Tri-Level Amplifier Gain Control.

GAIN = VDD, gain set to 40dB.

GAIN = GND, gain set to 50dB.

GAIN = Unconnected, uncompressed gain set to 60dB.

Amplifier Bias. Bypass to GND with a 0.47µF capacitor.

Microphone Bias Output

AGC Threshold Control. TH voltage sets gain control threshold. Connect TH to MICBIAS to disable

the AGC.

Exposed Pad. Connect the TDFN EP to GND.

6 _______________________________________________________________________________________

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