Omnidirectional Microphone with

Bottom Port and Analog Output

Preliminary Technical Data

ADMP404

Rev. PrH

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FEATURES

Tiny 3.35 mm × 2.50 mm × 0.88 mm surface-mount package

High SNR of 62 dBA

High sensitivity of −38 dBV

Flat frequency response from 100 Hz to 15 kHz

Low current consumption: <250 µA

Single-ended analog output

High PSRR of 70 dB

Compatible with Sn/Pb and Pb-free solder processes

RoHS/WEEE compliant

APPLICATIONS

Smartphones and feature phones

Digital video cameras

Bluetooth headsets

Video phones

Teleconferencing systems

GENERAL DESCRIPTION

The ADMP404 is a high quality, low cost, low power, analog

output bottom-ported omnidirectional MEMS microphone.

The ADMP404 consists of a MEMS microphone element, an

impedance converter, and an output amplifier. The ADMP404

sensitivity specification makes it an excellent choice for both

near field and far field applications. The ADMP404 has a high

SNR and flat, wideband frequency response, resulting in natural

sound with high intelligibility. Low current consumption

enables long battery life for portable applications. A built-in

particle filter provides high reliability. The ADMP404 complies

with the TIA-920 Telecommunications Telephone Terminal

Equipment Transmission Requirements for Wideband Digital

Wireline Telephones standard.

The ADMP404 is available in an ultraminiature 3.35 mm ×

2.50 mm × 0.88 mm surface-mount package. It is reflow solder

compatible with no sensitivity degradation. The ADMP404 is

halide free.

FUNCTIONAL BLOCK DIAGRAM

ASIC

OUTPUT

GND

MEMS

MEMBRANE

BACKPLATE

IMPEDANCE

CONVERTER

OUTPUT AMPLIFIER

ADMP404

Figure 1.