Toshiba TC9349AFG Manual page 114

Electronic Volume
This product incorporates 2-channel 32-step (0 to − 78 dB, −∞ dB) electronic volume. This allows digitization of volume
control of headphone amplifier and reduction of parts.
The electronic volume pins are also used as I/O port 5 and I/O port pin P4-3. Channels can be switched between channels
1 and 2, which support monaural and stereo sound. The attenuation of the electronic volume is in –2 db steps within the
range of –0 to –40 db and in –4 db steps in a range of –40 db to –78 db.
1. Electronic Volume Data Port and Control Port
φL15(2)
Y1 Y2 Y4
VR0 VR1 VR2
φL15(3)
Y8 Y1 Y2
VR3 VR4 *
電子ボリュームデータ
Electronic volume data
STEP -∞dB
1
1
0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 0
14 0
15 0
16 0
17 0
18 0
19 0
20 0
21 0
22 0
23 0
24 0
25 0
26 0
27 0
28 0
29 0
30 0
31 0
32 0
114
Y4 Y8
* *
VR4 VR3 VR2 VR1 VR0
* * * *
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 1
0 0 1 0
0 0 1 0
0 0 1 1
0 0 1 1
0 1 0 0
0 1 0 0
0 1 0 1
0 1 0 1
0 1 1 0
0 1 1 0
0 1 1 1
0 1 1 1
1 0 0 0
1 0 0 0
1 0 0 1
1 0 0 1
1 0 1 0
1 0 1 0
1 0 1 1
1 0 1 1
1 1 0 0
1 1 0 0
1 1 0 1
1 1 0 1
1 1 1 0
1 1 1 0
1 1 1 1
1 1 1 1
TC9349AFG
Attenua-
減衰量
tion
*
-∞dB
0
1 -78dB
0 -74dB
1 -70dB
0 -66dB
1 -62dB
0 -58dB
1 -54dB
0 -50dB
1 -46dB
0 -42dB
1 -40dB
0 -38dB
1 -36dB
0 -34dB
1 -32dB
0 -30dB
1 -28dB
0 -26dB
1 -24dB
0 -22dB
1 -20dB
0 -18dB
1 -16dB
0 -14dB
1 -12dB
0 -10dB
1 -8dB
0 -6dB
1 -4dB
0 -2dB
1 -0dB
2006-02-24