SI4708-C Datasheet, PDF (26/40 Pages) Silicon Laboratories – BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Si4708/09-C
Register 06h. System Configuration 3
Bit D15 D14 D13 D12 D11 D10 D9
D8 D7 D6 D5 D4 D3 D2 D1 D0
Name SMUTER[1:0] SMUTEA[1:0] 0
0
0 VOLEXT SKSNR[3:0]
SKCNT[3:0]
Type
R/W
R/W
R/W R/W R/W R/W
R/W
R/W
Reset value = 0x0000
Bit
15:14
13:12
11:9
8
7:4
3:0
Name
SMUTER[1:0]
SMUTEA[1:0]
Reserved
VOLEXT
SKSNR[3:0]
SKCNT[3:0]
Function
Softmute Attack/Recover Rate.
00 = fastest (default).
01 = fast.
10 = slow.
11 = slowest.
Softmute Attenuation.
00 = 16 dB (default).
01 = 14 dB.
10 = 12 dB.
11 = 10 dB.
Always write to zero.
Extended Volume Range.
0 = disabled (default).
1 = enabled.
This bit attenuates the output by 30 dB. With the bit set to 0, the 15 volume settings
adjust the volume between 0 and –28 dBFS. With the bit set to 1, the 15 volume set-
tings adjust the volume between –30 and –58 dBFS.
Refer to 4.5. "Stereo Audio Processing" on page 15.
Seek SNR Threshold.
0000 = disabled (default).
0001 = min (most stops).
1111 = max (fewest stops).
Required channel SNR for a valid seek channel.
Seek FM Impulse Detection Threshold.
0000 = disabled (default).
0001 = max (most stops).
1111 = min (fewest stops).
Allowable number of FM impulses for a valid seek channel.
26
Rev. 1.2