Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.11.5.3 Recommended Speaker Characteristics
Speakers: Electro-magnetic /10mW
Impedance: 8
Ω for hands-free (EAR)
Impedance: 32
Ω for heads kit (AUXO)
Sensitivity: 110dB SPL min
Receiver frequency response compatible with the GSM specifications.
3.11.5.4 Recommended Filtering Components
When designing a GSM application, it is important to select the right audio filtering
components.
The strongest noise, called TDMA, is mainly due to the GSM850/GSM900/DCS1800
demodulation and PCS1900 signal: A burst being produced every 4.615ms; the
frequency of the TDMA signal is equal to 216.7Hz plus harmonics.
The TDMA noise can be suppressed by filtering the RF signal by using the right
decoupling components.
The types of filtering components are:
• RF decoupling inductors
• RF decoupling capacitors
A good “Chip S-Parameter” simulator is proposed by Murata, please visit the website
to find more information:
http://www.murata.com/designlib/mcsil.html
When using different Murata components, the value, the package and the current
rating can have different decoupling effects.
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prior written agreement.
WA_DEV_Q64_PTS_001-003 January 9, 2009