Appendix

BT_HTS_RX_R2

6/9

3

Appendix

3.1

FFT result with analog dongle (STM reference: STM529AD)

Here are the results of testing the STM analog dongle (reference: STM529AD) with a 1-kHz,

2.36-V RMS (max) sine-wave input and 1.0-Vpp line out.

Figure 6.

FFT result on Bluetooth analog dongle

Input signal Vrms=2.36v (max)

Line out Vpp=1v

SNR=73dB(A weighting),(600ohms)

-140

+0

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

d

B

V

20

20k

50

100

200

500

1k

2k

5k

10k

Hz