CSR8635 View Datasheet(PDF) - CSR plc

Part Name

Description

Manufacturer

CSR8635

The CSR8635 QFN single-chip Bluetooth® audio ROM device targets mid-range stereo speakers and headsets.

CSR plc 

■ Initial Frequency Error: The difference between the desired frequency and the actual oscillating frequency

caused by the crystal itself and its PCB connections. It is also called as Calibration Tolerance or Frequency

Tolerance.

■ Frequency Stability: The total of how far the crystal can move off frequency with temperature, aging or other

effects. It is also called as Temperature Stability, Frequency Stability or Aging.

CSR8635 QFN has the capability to compensate for Initial Frequency errors by a simple per-device basis on the

production line, with the trim value stored in the non-volatile memory (PS Key). However, it is not possible to compensate

for frequency stability, therefore a crystal must be chosen with a Frequency Stability that is better than ±20 ppm clock

accuracy.

Some crystal datasheets combine both these terms into one tolerance value. This causes a problem because only the

initial frequency error can be compensated for and CSR8635 QFN cannot compensate for the temperature or aging

performance. If frequency stability is not explicity stated, CSR cannot guarantee remaining within the Bluetooth's

3.2 Non-crystal Oscillator oTpATiQ±CpioF3nsf.rfa2hhoprFff2oTryssr0eerpeNdtsaeespmlaoveuytbthtpaidafxcsolvootmlelthttra.wufehecefe3lFteraifenushnr.nirel4aeneeiiarotanbx.bhqaflmloircTtlseutPtaeecirrehoemylrtSdstvsoienhnsot.abKtacoPaict.nesleaktErulyTrix,etolueerw.Yitytasdeneshpp_eocfereeaieioAncenfcsirrnuEtancPNaeehParalqlSnTAdetalrSlyhusceiXrKc_b,KfeaiefyFoanSEreatEatTrgicsrTYrolTYtPeolulRpqiAoen_onXw_eSeiIAcRnncAMm3Sc-KkcNgelT.iNfeT_refE2atbAiycvoOcAAa:rYcosl_aeaosCt_RFtt_FodlhtaukcFirAFTsrTioelkreyoTSieNntfRsnvriorRCmstaE.tAeueIeaISMdcrqTsne_MsleoiRouFtn.o_Cqiz_riessOtT8druaOhceeno6R,aiFlooricecFf3obeImFut1yMFR5rrdBS,a6amS-Fa_Qlfic-EtunaEOibeatodocFTeuiaxnTtFntiuuTNagccd.ia2FtneliUteplCt',iXSioassvsulpsapStTflEetiac-fsnnoURslATforaeedgrietsL8nmenvsntet=P_6teqdthp.fprI3lrcuSaNedleoG(es5oenKermqfvmmniudneQfEn2auacioepptd.2YltaFcyhmuchn0uetsr_Nneeuetaeitl.rAnae.nonssd-atwlNeChuidelegaFpaenAotsncrv−nmdnmi_iieanrdeenFedceno.a1dePTdoadT)iybcnSRmstef,hotertu×KsIeepeSXMrtp,EgqeheTei2ce_teunYempAl2rOmoresf_0tnLeocaenwFAue_nrktcmFsmhNeOatytmSisrobAceUbecEfuhefd_esaTotsTFrhtsnprqttR2pieroutnmbeh7eEitoecgseee,cQukerige2cfiolt,nniyetap0euftitrlu1tnsanhcw.ioat3sduetmhRlh.lpaiefsenFratpnaeeflre.fqrCdtracEeuo.ScieqqfTftiRunciuthoha8ecainsety6ntiaio3oclny5n

Production Information

© Cambridge Silicon Radio Limited 2013

Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement

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