Inven Sense AN-000013, User Manual

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AN-000013
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: 1.5
Release Date: 06/12/2017
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
• EV_ICS-40212-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
ICS-40212 165 µA 0.63 V rms 190 Ω 1.0 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)
V
DD
0.1µF
OUTPUT
GND
MICROPHONE