MAX9814EVKIT+ Maxim Integrated Products, MAX9814EVKIT+ Datasheet

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MAX9814EVKIT+

Manufacturer Part Number
MAX9814EVKIT+
Description
EVALUATION KIT FOR MAX9814
Manufacturer
Maxim Integrated Products
Datasheets

Specifications of MAX9814EVKIT+

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Voltage - Supply
2.7V ~ 5.5V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
MAX9814
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Max Output Power X Channels @ Load
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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 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.
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.
19-0764; Rev 2; 6/09
Digital Still Cameras
Digital Video Cameras
PDAs
Bluetooth Headsets
Entertainment Systems
(e.g., Karaoke)
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
R
MICBIAS
________________________________________________________________ Maxim Integrated Products
C
IN
General Description
MICBIAS
MICIN
Two-Way Communicators
High-Quality Portable
Recorders
IP Phones/Telephone
Conferencing
Microphone Amplifier with AGC and
Applications
+12dB
LOW-NOISE
REFERENCE
LNA
Low-Noise Microphone Bias
SHDN
2.7V TO 5.5V
+20dB/0dB
GND
V
♦ 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
♦ -40°C to +85°C Extended Temperature Range
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
* EP = Exposed pad.
Pin Configurations appear at end of data sheet.
DD
VGA
MAX9814ETD+T
AGC
x 3mm) Package
PART
Simplified Block Diagram
+8/+18/
+28dB
GAIN
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX9814
MICOUT
PIN-PACKAGE
14 TDFN-EP*
C
Features
OUT
1

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MAX9814EVKIT+ Summary of contents

Page 1

... MICBIAS R MICBIAS C IN MICIN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Low-Noise Microphone Bias ♦ Automatic Gain Control (AGC) ♦ Three Gain Settings (40dB, 50dB, 60dB) ♦ Programmable Attack Time ♦ ...

Page 2

Microphone Amplifier with AGC and Low-Noise Microphone Bias ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD All Other Pins to GND.................................-0. Output Short-Circuit Duration.....................................Continuous Continuous Current (MICOUT, MICBIAS).......................±100mA All Other Pins ....................................................................±20mA Stresses beyond those listed ...

Page 3

Microphone Amplifier with AGC and ELECTRICAL CHARACTERISTICS (continued) = 3.3V, SHDN = 470nF +25°C.) (Note 1) A PARAMETER SYMBOL MICOUT High Output Voltage MICOUT Low Output Voltage MICOUT ...

Page 4

Microphone Amplifier with AGC and Low-Noise Microphone Bias ( 470nF 2.2µ +25°C, unless otherwise noted.) A GAIN vs. FREQUENCY 80 GAIN = UNCONNECTED ...

Page 5

Microphone Amplifier with AGC and ( 470nF 2.2µ +25°C, unless otherwise noted.) A MICBIAS NOISE vs. FREQUENCY 10,000 1000 100 10 10 100 1k 10k 100k FREQUENCY (Hz) ...

Page 6

Microphone Amplifier with AGC and Low-Noise Microphone Bias ( 470nF 2.2µ +25°C, unless otherwise noted.) A HOLD AND RELEASE TIME V MICOUT 500mV/div 0V 40ms/div PIN NAME TDFN ...

Page 7

Microphone Amplifier with AGC and Detailed Description The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and a low- noise microphone bias. The MAX9814 consists of sever- al distinct circuits: a low-noise preamplifier, a variable gain ...

Page 8

Microphone Amplifier with AGC and Low-Noise Microphone Bias HOLD ATTACK RELEASE 0V 0V 10ms/div Figure 2. Input Burst Exceeding AGC Limit The attack time is the time it takes for the AGC to reduce the gain after the input signal ...

Page 9

Microphone Amplifier with AGC and Setting the AGC Threshold To set the output-voltage threshold at which the micro- phone output is clamped, an external resistor-divider must be connected from MICBIAS to ground with the out- put of the resistor-divider applied ...

Page 10

Microphone Amplifier with AGC and Low-Noise Microphone Bias BIAS C BIAS 0.47μF MICBIAS R MICBIAS 2.21kΩ MICIN C IN 0.1μ 470nF 2.2μF *THE DEVICE HAS BEEN CONFIGURED WITH AN ATTACK TIME OF 1.1ms, 40dB ...

Page 11

Microphone Amplifier with AGC and Pin Configuration TOP VIEW MAX9814 * TDFN ______________________________________________________________________________________ Low-Noise Microphone Bias PROCESS: BiCMOS Chip Information 11 ...

Page 12

Microphone Amplifier with AGC and Low-Noise Microphone Bias For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 14 TDFN-EP 12 ______________________________________________________________________________________ Package Information PACKAGE CODE T1433-2 DOCUMENT NO. 21-0137 ...

Page 13

Microphone Amplifier with AGC and For the latest package outline information and land patterns www.maxim-ic.com/packages. COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE T633-2 A 0.70 0.80 T833-2 D 2.90 3.10 E 2.90 3.10 T833-3 A1 0.00 ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...

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