UG-325

Analog Output MEMS Microphone Flex Evaluation Board User Guide

InvenSense reserves the right to change the detail

specifications as may be required to permit improvements

in the design of its products.

InvenSense Inc.

1745 Technology Drive, San Jose, CA 95110 U.S.A

+1(408) 988–7339

www.invensense.com

Document Number: AN-000013

Revision: 1.4

Release Date: 03/26/2015

GENERAL DESCRIPTION

This user guide applies to the following MEMS microphone

evaluation boards:



EV_INMP404-FX



EV_INMP405-FX



EV_INMP504-FX



EV_INMP510-FX



EV_ICS-40180-FX



EV_ICS-40181-FX



EV_ICS-40310-FX

This is a simple evaluation board that allows quick evaluation

of the performance of single-ended analog MEMS

microphones. The small size and low profile of the flexible

PCB enables direct placement of the microphone into a

prototype or an existing design for an in situ evaluation. The

evaluation board consists of a bottom port microphone

soldered to a flexible PCB with color-coded wires attached.

The only other component on the board is a 0.1 μF supply

bypass capacitor.

Table 1 describes the functions of the three connection wires.

Table 2 describes the functional differences between the

different microphones that are used with this flex circuit.

TABLE 1. PIN FUNCTION DESCRIPTIONS

Wire

Color

Microphone

Pin

Description

Red

VDD

Power Supply. 1.5 V DC to 3.6 V DC;

(0.9 V DC to 1.3 V DC for ICS-40310)

White

OUTPUT

Analog Output Signal

Black

GND

Ground

TABLE 2. MICROPHONE FUNCTIONAL

DIFFERENCES

Microphone

Maximum

Supply

Current

Maximum

Output

Voltage

Output

Impedance

DC

Offset

INMP404

250 µA

0.18 V rms

200 Ω

0.8 V

INMP405

250 µA

0.18 V rms

200 Ω

0.8 V

INMP504

225 µA

0.18 V rms

200 Ω

0.8 V

INMP510

250 µA

0.40 V rms

350 Ω

0.7 V

ICS-40180

260 µA

0.40 V rms

350 Ω

0.7 V

ICS-40181

250 µA

0.40 V rms

350 Ω

0.7 V

ICS-40310

25 µA

0.12 V rms

4.5 kΩ

0.57 V

EVALUATION BOARD CIRCUIT

Figure 1 shows the schematic of the evaluation board, and

Figure 2 shows the flex board layout. See the respective

microphone data sheets for complete descriptions and

specifications of the microphones. Note that the layout for

the EV_ICS-40181-FX differs slightly from what is shown in

Figure 2 because of this part’s different package footprint,

but the routing of the three signals is consistent.

Figure 1. Evaluation Board Schematic

Figure 2. Evaluation Board Layout (Top View)

0.1µF

OUTPUT

GND

MICROPHONE