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MAX9814ETD Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX9814ETD Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 14 page Microphone Amplifier with AGC and Low-Noise Microphone Bias HOLD AND RELEASE TIME 40ms/div VMICOUT 500mV/div CCT = 47nF A/R = VDD 0V HOLD AND RELEASE TIME 100ms/div VMICOUT 500mV/div CCT = 47nF A/R = UNCONNECTED 0V Pin Description PIN TDFN NAME FUNCTION 1CT Timing Capacitor Connection. Connect a capacitor to CT to control the Attack and Release times of the AGC. 2 SHDN Active-Low Shutdown Control 3 CG Amplifier DC Offset Adjust. Connect a 2.2µF capacitor to GND to ensure zero offset at the output. 4, 11 N.C. No Connection. Connect to GND. 5VDD Power Supply. Bypass to GND with a 1µF capacitor. 6 MICOUT Amplifier Output 7 GND Ground 8 MICIN Microphone Noninverting Input 9A/R 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 10 GAIN Tri-Level Amplifier Gain Control. GAIN = VDD, gain set to 40dB. GAIN = GND, gain set to 50dB. GAIN = Unconnected, uncompressed gain set to 60dB. 12 BIAS Amplifier Bias. Bypass to GND with a 0.47µF capacitor. 13 MICBIAS Microphone Bias Output 14 TH AGC Threshold Control. TH voltage sets gain control threshold. Connect TH to MICBIAS to disable the AGC. — EP Exposed Pad. Connect the TDFN EP to GND. Typical Operating Characteristics (continued) (VDD = 5V, CCT = 470nF, CCG = 2.2µF, VTH = VMICBIAS x 0.4, GAIN = VDD (40dB), AGC disabled, no load, RL = 10k Ω, COUT = 1µF, TA = +25°C, unless otherwise noted.) MAX9814 6 Maxim Integrated |
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