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MAX9814 Datasheet

Microphone Amplifier

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MAX9814
EVALUATION KIT AVAILABLE
Microphone Amplifier with AGC and
Low-Noise Microphone Bias
General Description
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.
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 threshold.
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.
The MAX9814 is available in the space-saving, 14-pin
TDFN package. This device is specified over the -40°C to
+85°C extended temperature range.
Applications
● Digital Still Cameras
● Digital Video Cameras
● PDAs
● Bluetooth Headsets
● Entertainment Systems (e.g., Karaoke)
● Two-Way Communicators
● High-Quality Portable Recorders
● IP Phones/Telephone Conferencing
Features
● Automatic Gain Control (AGC)
● Three Gain Settings (40dB, 50dB, 60dB)
● Programmable Attack Time
● Programmable Attack and Release Ratio
● 2.7V to 5.5V Supply Voltage Range
Low Input-Referred Noise Density of 30nV/√Hz
● Low THD: 0.04% (typ)
● Low-Power Shutdown Mode
● Internal Low-Noise Microphone Bias, 2V
● Available in the Space-Saving, 14-Pin TDFN
(3mm x 3mm) Package
● -40°C to +85°C Extended Temperature Range
Ordering Information appears at end of data sheet.
Simplified Block Diagram
2.7V TO 5.5V
RMICBIAS
MICBIAS
CIN
MICIN
LOW-NOISE
REFERENCE
SHDN VDD
AGC
LNA
+12dB
VGA
+20dB/0dB
GND
MAX9814
GAIN
+8/+18/
+28dB
MICOUT
COUT
19-0764; Rev 3; 8/16


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9814 Datasheet

Microphone Amplifier

No Preview Available !

MAX9814
Microphone Amplifier with AGC and
Low-Noise Microphone Bias
Absolute Maximum Ratings
VDD to GND.............................................................-0.3V to +6V
All Other Pins to GND............................... -0.3V to (VDD + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Current (MICOUT, MICBIAS).......................±100mA
All Other Pins....................................................................±20mA
Continuous Power Dissipation (TA = +70°C)
14-Pin TDFN-EP
(derate 16.7mW/°C above +70°C).........................1481.5mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Lead Temperature (soldering, 10s).................................. +300°C
Bump Temperature (soldering) Reflow............................. +235°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VDD = 3.3V, SHDN = VDD, CCT = 470nF, CCG = 2μF, GAIN = VDD, TA = TMIN to TMAX, unless otherwise specified. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
GENERAL
Operating Voltage
Supply Current
Shutdown Supply Current
Input-Referred Noise Density
Output Noise
Signal-to-Noise Ratio
SYMBOL
VDD
IDD
ISHDN
en
SNR
CONDITIONS
Guaranteed by PSRR test
BW = 20kHz, all gain settings
BW = 20kHz
BW = 22Hz to 22kHz
(500mVRMS output signal)
A-weighted
MIN TYP MAX UNITS
2.7 5.5 V
3.1 6 mA
0.01 1
µA
30 nV/√Hz
430 µVRMS
61
dB
64
Dynamic Range
DR (Note 2)
60 dB
Total Harmonic Distortion Plus
Noise
Amplifier Input BIAS
Maximum Input Voltage
Input Impedance
Maximum Gain
THD+N
VIN
VIN_MAX
ZIN
A
fIN = 1kHz, BW = 20Hz to 20kHz,
RL = 10kΩ, VTH = 1V (threshold = 2VP-P),
VIN = 0.5mVRMS, VCT = 0V
fIN = 1kHz, BW = 20Hz to 20kHz,
RL = 10kΩ, VTH = 0.1V (threshold =
200mVP-P), VIN = 30mVRMS, VCT = 2V
1% THD
1.14
GAIN = VDD
GAIN = GND
39.5
49.5
0.04
0.2
1.23
100
100
40
50
%
1.32
40.5
50.6
V
mVP-P
kΩ
dB
GAIN = unconnected
59.5 60 60.5
Minimum Gain
GAIN = VDD
GAIN = GND
18.7 20 20.5
29.0
30 30.8 dB
GAIN = unconnected
38.7 40 40.5
Maximum Output Level
Regulated Output Level
AGC Attack Time
VOUT_RMS­
tATTACK
1% THD+N, VTH = MICBIAS
AGC enabled, VTH = 0.7V
CCT = 470nF (Note 3)
A/R = GND
1.26
0.707
1.40
1.1
1:500
1.54
VRMS
VP-P
ms
Attack/Release Ratio
A/R A/R = VDD
A/R = unconnected
1:2000
1:4000
ms/ms
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX9814
Description Microphone Amplifier
Maker Maxim Integrated Products
Total Page 13 Pages
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