General Description

The MAX9812/MAX9813 are single/dual-input, 20dB

fixed-gain microphone amplifiers. They offer tiny pack-

aging and a low-noise, integrated microphone bias,

making them ideal for portable audio applications such

as notebook computers, cell phones, and PDAs. These

amplifiers feature a 500kHz bandwidth, rail-to-rail out-

puts, an industry-leading 100dB power-supply rejection

ratio, and a very low 0.015% THD+N. Power-saving fea-

tures include very low 230µA supply current and a total

shutdown mode that cuts the combined supply and

BIAS currents to only 100nA.

The MAX9812 is a single amplifier in a 6-pin SC70

package (2mm x 2.1mm) and the MAX9813 is a dual-

input amplifier available in an 8-pin SOT23 (3mm x

3mm) package. The MAX9813 has two inputs allowing

two microphones to be multiplexed to a single output.

The MAX9812/MAX9813 are offered in two grades. The

MAX9812L/MAX9813L are optimized for 3.3V supply

operation (2.7V to 3.6V). The MAX9812H/MAX9813H are

PC2001 compliant and are optimized for 5V operation

(4.5V to 5.5V). Both devices are specified over the -40°C

to +85°C extended operating temperature range.

Applications

Notebook Computers

PDAs

Smart Phones

Car Kit Adapters

Digital Cameras

Video Tape Recorders

Features

o PC2001 Compliant

o 100dB at 217Hz Power-Supply Rejection Ratio

o Very Low 230µA Quiescent Current

o Low 0.015% THD+N

o Available in Two Versions

MAX9812L/MAX9813L—2.7V to 3.6V

MAX9812H/MAX9813H—4.5V to 5.5V

o Internal Low-Noise Microphone Bias Supply

2.3V for MAX9812L/MAX9813L

4.0V for MAX9812H/MAX9813H

o 100nA Low-Power Shutdown Mode

o Rail-to-Rail Outputs

o 20dB Fixed Gain

o Available in Tiny 6-Pin SC70 (2mm x 2.1mm) and

8-Pin SOT23 (3mm x 3mm) Packages

o Extended Temperature Range -40°C to +85°C

19-2840; Rev 2; 9/12

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

MAX9812/MAX9813

Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain

Microphone Amplifiers with Integrated Bias

Ordering Information

Pin Configurations, Selector Guide, and Typical Operating

Circuits appear at end of data sheet.

PART

TEMP RANGE

PIN-

MAX9812LEXT+T

-40

°C to +85°C 6 SC70

2.7 to 3.6

MAX9812LEXT/V+T

-40

°C to +85°C 6 SC70

2.7 to 3.6

MAX9812HEXT+T

-40

°C to +85°C 6 SC70

4.5 to 5.5

MAX9813LEKA+T

-40

°C to +85°C 8 SOT23

2.7 to 3.6

MAX9813HEKA+T

-40

°C to +85°C 8 SOT23

4.5 to 5.5

MAX9812

20dB

REFERENCE

2.3V (L VERSION)

4.0V (H VERSION)

IN

BIAS

OUT

SHDN

GND

MAX9813

20dB

IN1/IN2

REFERENCE

2.3V (L VERSION)

4.0V (H VERSION)

IN2

IN1

BIAS

OUT

SHDN

GND

Simplified Block Diagrams

+

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.