CDB7132P
1 System Overview
1 System Overview
The CDB7132P customer demo board is a flexible PCB for evaluating the WM7132P low-profile analog silicon
microphone. The following subsections describe the features of CDB7132P customer demo board in detail.
1.1 Test Points
Six test points are available to provide all the connections from WM7132P to standard test equipment for full acoustic
measurement. Test points are described in Table 1-1. The operating supply voltage of WM7132P is provided in the data
sheet, which is available from Cirrus website.
Table 1-1. Test Point signals
Test Point
Pin
Direction
Description
TP1
TP2
TP3
VDD
OP+
NA
Supply
Output
NA
Analog Supply
Microphone analogue output signal
Not Applicable
TP4, TP5, TP6
GND
Ground reference
Analog Ground
1.2 Edge Connector
The J1 and J2 edge connector pads provide a pluggable connection to a codec main board with compatible edge card
socket. The edge connector pin-outs are described in Table 1-2 and Table 1-3.
Table 1-2. Edge connection J1
Pin
Pin
Direction
Description
Microphone analogue output signal
(pin 1 is marked by a small dot)
Analog supply from codec MICBIAS
Analog ground
1
OP+
Output
2
3, 7
8
VDD
GND
—
Supply
Ground reference
—
—
Not applicable
No connection
4, 5, 6, 9, 10
NC
Table 1-3. Edge connection J2
Direction
Pin
Pin
Description
1,2,3,4,5,6,7,8,9,10
NC
NA
No Connection
1.3 Trim Line
To enable more accurate free field frequency responses to be obtained, the flexible region of the CDB7132P may be
trimmed to reduce acoustic interactions. If required, there is a guide line on the silkscreen that can be cut along. Refer to
Fig. 4-1 for further details.
3
DS1125DB1
CIRRUS [ CIRRUS LOGIC ]
