AirPrime Module Datasheet
Table Of Contents
- 1: Introduction
- 2: Physical Characteristics
- 3: Audio Circuit
- 4: Hardware Design Guidelines
- 5: Power Supply Sequencing
- 6: GPIO Electrical Specifications
- 7: Solder Reflow Profile
- A: Regulatory Certifications
- B: Packaging Dimensions
Product Technical Specification
Rev 1 Apr.17 24 41110693
External Speaker Connections
In some versions of the BC127/BC128, the speaker lines SPKR_LN, SPKR_LP,
SPKR_RN & SPKR_RP were internally DC blocked by 100nF capacitors on the
module. This limited the low frequency response of the audio output. A new
BC127 (V4 and above still to be released) will have these capacitors removed. So
external series capacitors are now required on the four audio output lines
mentioned above.
Select the capacitor values based on the low frequency response you wish to
achieve in your application. 1uF would be a typical suggested value.
Figure 4-9: External Series Capacitance Required for Speaker Output Connects
Figure 4-10: Isolation