CSR8615A04-IQQF-R View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'CSR8615A04-IQQF-R' PDF : 114 Pages View PDF
2 Bluetooth Modem
2.1 RF Ports
2.1.1 BT_RF
CSR8615 QFN contains an on-chip balun which combines the balanced outputs of the PA on transmit and produces
the balanced input signals for the LNA required on receive. No matching components are needed as the receive
mode impedance is 50Ω and the transmitter has been optimised to deliver power into a 50Ω load.
2TSGneFtoxohouS.cterf2dhMfeEiierceseDiacdeEcnRrneDtidmht,iRveotWiehRnumBrea‑tF-ClftoudoeoDdeefaPrP-RetmMtbtrouAa+me_aoeoArLnpne.tdkNhcdsacueiArerlasbeaelllitundqon_+ovleeucarfekeaiorrcidrernrop-emzgnjhadetoesamrannpoinenteesIsdscFtfriaoifaTatinscrnrsaccsFAeathomixioDgoi‑cticunCet-ethrcelaeaalwterutpns2hntranh.eitw1cecephi:thlthehLSaedaroNnifictmogudAoeritptmmnaibilsniadeaVfempibjeinsaDnul.dceccgttDehesoCedenimntinehtraIcsecF.tbcuOehhlcnirneeatnehssnB--cpaicnteTtrMnihehesi_nveesloiRepeerdnrleFdne.BdfjicecAslaateeciegylditurvoni,iosgnefaSnirtnltoe..atooTplbisFhteoeeiSpsmineKeinntbredafaeogitbsrerrlcmaeB1irtns6iaeTmtd,cC_iiolV2noRSon0aSsnRF1teitSos8o3pr_6tthrmh1Boee5exTniadQ_mpniReFaist.NyFstshttoeaodt
2.2.1 Low Noise Amplifier
The LNA operates in differential mode and takes its input from the balanced port of the on-chip balun.
2.2.2 RSSI Analogue to Digital Converter
The ADC implements fast AGC. The ADC samples the RSSI voltage on a slot-by-slot basis. The front-end LNA gain
is changed according to the measured RSSI value, keeping the first mixer input signal within a limited range. This
improves the dynamic range of the receiver, improving performance in interference-limited environments.
Pre-production Information
© Cambridge Silicon Radio Limited 2013
Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement
Page 23 of 114
CS-303726-DSP3
www.csr.com
Share Link: 
