CDB7236
2 Quick Setup Guide
2 Quick Setup Guide
As a standalone PCB, the CDB7236 can be used in a pressure field acoustic test setup or free field acoustic test setup. It
can also be connected to a compatible codec main board to enable full signal path setup within a system platform.
Acoustic measurements can be obtained using a number of different methods. Typical acoustic test setups, using a
comparison method, are shown in Section 2.1 and Section 2.2.
2.1 Pressure field acoustic test
Recommendations for accurate pressure field measurements are as follows:
•
•
•
•
•
•
Ensure calibrated test equipment is used for making measurements
Ensure CDB7236 acoustic port hole is tightly sealed within the pressure field test cavity
Ensure CDB7236 and reference mic are placed close together with minimum placement error
Use a suitable test microphone—a pressure field reference microphone is recommended
Ensure the pressure field test cavity is tightly sealed
Measurements should be performed within a quiet environment
Quiet Environment
Pressure Field Test Cavity
Power
CDB7236
Test Point
Connections
Sound
Pressure
Level
Test
Speaker
Pressure Field
Reference Mic
Standard Test Equipment
Figure 2-1. Pressure field test setup with CDB7236
4
DS1128DB1
CIRRUS [ CIRRUS LOGIC ]
