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MAX9814

更新时间： 2024-11-28 04:41:31
品牌 Logo 应用领域
美信 - MAXIM 放大器
页数 文件大小 规格书
14页 338K
描述
Microphone Amplifier with AGC and Low-Noise Microphone Bias

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MAX9814 数据手册

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19-0764; Rev 0; 3/07  
Microphone Amplifier with AGC and  
Low-Noise Microphone Bias  
MAX9814  
General Description  
Features  
The MAX9814 is a low-cost, high-quality microphone  
amplifier with automatic gain control (AGC) and low-  
noise microphone bias. The device features a low-noise  
preamplifier, variable gain amplifier (VGA), output  
amplifier, microphone-bias-voltage generator and AGC  
control circuitry.  
o Automatic Gain Control (AGC)  
o Three Gain Settings (40dB, 50dB, 60dB)  
o Programmable Attack Time  
o Programmable Attack and Release Ratio  
o 2.7V to 5.5V Supply Voltage Range  
o Low Input-Referred Noise Density of 30nV/√Hz  
o Low THD: 0.04% (typ)  
The low-noise preamplifier has a fixed 12dB gain, while  
the VGA gain automatically adjusts from 20dB to 0dB,  
depending on the output voltage and the AGC thresh-  
old. The output amplifier offers selectable gains of 8dB,  
18dB, and 28dB. With no compression, the cascade of  
the amplifiers results in an overall gain of 40dB, 50dB,  
or 60dB. A trilevel digital input programs the output  
amplifier gain. An external resistive divider controls the  
AGC threshold and a single capacitor programs the  
attack/release times. A trilevel digital input programs  
the ratio of attack-to-release time. The hold time of the  
AGC is fixed at 30ms. The low-noise microphone-bias-  
voltage generator can bias most electret microphones.  
o Low-Power Shutdown Mode  
o Internal Low-Noise Microphone Bias, 2V  
o Available in the Space-Saving 12-Bump UCSP  
(1.5mm x 2mm) and 14-Pin TDFN (3mm x 3mm)  
Packages  
o -40°C to +85°C Extended Temperature Range  
The MAX9814 is available in the space-saving 12-bump  
UCSP™ (1.5mm x 2mm) and 14-pin TDFN packages.  
This device is specified over the -40°C to +85°C  
extended temperature range.  
Ordering Information  
PIN-  
PACKAGE  
PKG  
CODE  
PART  
TEMP RANGE  
Applications  
MAX9814EBC+T -40°C to +85°C 12 UCSP-12  
MAX9814ETD+T -40°C to +85°C 14 TDFN-14  
+Denotes a lead-free package.  
B12-3  
Digital Still Cameras  
Digital Video Cameras  
PDAs  
Two-Way Communicators  
T1433-2  
High-Quality Portable  
Recorders  
Pin Configurations appear at end of data sheet.  
IP Phones/Telephone  
Conferencing  
Bluetooth Headsets  
UCSP is a trademark of Maxim Integrated Products, Inc.  
Entertainment Systems  
(e.g., Karaoke)  
Simplified Block Diagram  
2.7V TO 5.5V  
V
DD  
SHDN  
MICBIAS  
LOW-NOISE  
REFERENCE  
MAX9814  
AGC  
R
MICBIAS  
C
OUT  
C
IN  
GAIN  
+8/+18/  
+28dB  
MICIN  
OUT  
LNA  
+12dB  
VGA  
+20dB/0dB  
GND  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
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