UG-335 Datasheet, PDF (1/2 Pages) Analog Devices – EVAL-ADMP521Z Bottom Port Digital Output MEMS Microphone Evaluation Board

Evaluation Board User Guide
UG-335
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: [phone] • Fax: [phone] • www.analog.com
EVAL-ADMP521Z Bottom Port Digital Output MEMS Microphone Evaluation Board
GENERAL DESCRIPTION
The EVAL-ADMP521Z is a simple evaluation board that allows
quick evaluation of the performance of the ADMP521 bottom
port, digital output, omnidirectional microphone. The EVAL-
ADMP521Z has a dual-row, 12-pin, 0.1-inch spaced header for
access to all microphone pins. All signals are connected to the
row of pins along the edge of the board. The pins on the inner
row are not connected to any signals.
The EVAL-ADMP521Z is designed to plug directly into either row
of Connector J6 on the Analog Devices, Inc., EVAL-ADAU1761Z
evaluation board. When these two boards are connected, the
EVAL-ADMP521Z board should extend off the left edge of the
EVAL-ADAU1761Z board. Circuit Note CN0078 fully describes
the connection between these two boards and the register
settings of the codec.
The dimensions of the EVAL-ADMP521Z are 13 mm × 18 mm.
The evaluation board is RoHS-compliant part.
EVALUATION BOARD CIRCUIT
The schematic of the EVAL-ADMP521Z is shown in Figure 1.
See the ADMP521 data sheet for a complete description and
microphone specifications.
The PCB layout of the EVAL-ADMP521Z is shown in Figure 2.
The factory-installed 0.1 μF capacitor, C1, is a bypass capacitor
that reduces supply noise and ensures proper microphone
operation. The board is powered from a single 1.8 V to 3.3 V
supply on Pin 11 of the connector. The EVAL-ADMP521Z
connector pin functions are described in Table 1.
Table 1. Connector Pin Functions of the EVAL-ADMP521Z
Pin No.
Description
1
GND
2, 4, 5, 6, 8, 10, 12
Not connected
3
CLK
7
L/R SELECT
9
DATA
11
VDD
P1
1
2
3
4
5
GND
CLK
U1
ADMP521
1
4
CLK
V_DD
2 _{L/R SELECT}
5
DATA
6
7 L/R SELECT
GND
3
8
9 DATA
10
11 ^VDD
12
Figure 1. Schematic
C1
0.1µF
1 2 ^ANALOG
DEVICES
ADMP521
C1
11 12
Figure 2. PCB Layout
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 2
Figure 3. Evaluation Board Photograph