CSR8635 查看數據表（PDF） - CSR plc

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CSR8635

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

CSR plc 

2 Bluetooth Modem

2.1 RF Ports

2.1.1 BT_RF

CSR8635 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.

VDD

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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.

2.3 RF Transmitter

2.3.1 IQ Modulator

The transmitter features a direct IQ modulator to minimise frequency drift during a transmit timeslot, which results in a

controlled modulation index. Digital baseband transmit circuitry provides the required spectral shaping.

Production Information

© Cambridge Silicon Radio Limited 2013

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

Page 22 of 105

CS-303725-DSP5

www.csr.com

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