16.2.1 Wind Noise Reduction ............................................................................................................ 97
16.2.2 Dual-microphone Signal Separation ...................................................................................... 97
16.2.3 Noise Suppression ................................................................................................................. 97
16.2.4 Acoustic Echo Cancellation .................................................................................................... 97
16.2.5 Comfort Noise Generator ....................................................................................................... 98
16.2.6 Equalisation ............................................................................................................................ 98
16.2.7 Automatic Gain Control .......................................................................................................... 98
16.2.8 Packet Loss Concealment ..................................................................................................... 98
16.2.9 Adaptive Equalisation ............................................................................................................. 98
16.2.10 Auxiliary Stream Mix .............................................................................................................. 98
16.2.11 Clipper .................................................................................................................................... 98
16.2.12 Noise Dependent Volume Control .......................................................................................... 99
16.2.13 Fixed Gains ............................................................................................................................ 99
16.2.14 Frequency Enhanced Speech Intelligibility ............................................................................ 99
16.3 Music Enhancements .......................................................................................................................... 99
16.3.1 Audio Decoders ...................................................................................................................... 99
16.3.2 Configurable EQ ................................................................................................................... 100
16.3.3 Stereo Widening (S3D) ........................................................................................................ 100
16.3.4 Volume Boost ....................................................................................................................... 101
16.4 CSR8640 Stereo Headset Development Kit ...................................................................................... 101
17
Ordering Information ................................................................................................................................... 102
17.1 CSR8640 Stereo Headset Development Kit Ordering Information .................................................... 102
18
Tape and Reel Information ......................................................................................................................... 103
18.1 Tape Orientation ................................................................................................................................ 103
18.2 Tape Dimensions ............................................................................................................................... 103
18.3 Reel Information ................................................................................................................................ 104
18.4 Moisture Sensitivity Level .................................................................................................................. 104
19
Document References ................................................................................................................................ 105
Terms and Definitions .......................................................................................................................................... 106
List of Figures
Figure 1.1
Device Pinout .................................................................................................................................. 13
Figure 1.1
Pin Configuration, Orientation from Top of Device .......................................................................... 14
Figure 2.1
Simplified Circuit BT_RF ................................................................................................................. 23
Figure 3.1
Clock Architecture ........................................................................................................................... 25
Figure 5.1
Kalimba DSP Interface to Internal Functions .................................................................................. 28
Figure 6.1
Serial Flash Interface ...................................................................................................................... 29
Figure 7.1
Universal Asynchronous Receiver .................................................................................................. 30
Figure 7.2
Example I²C EEPROM Connection ................................................................................................. 33
Figure 8.1
LED Equivalent Circuit .................................................................................................................... 35
Figure 9.1
Audio Interface ................................................................................................................................ 36
Figure 9.2
Audio Codec Input and Output Stages ............................................................................................ 38
Figure 9.3
Audio Input Gain ............................................................................................................................. 39
Figure 9.4
Microphone Biasing ......................................................................................................................... 42
Figure 9.5
Differential Input .............................................................................................................................. 43
Figure 9.6
Single-ended Input .......................................................................................................................... 44
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 10 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
