ak4140 AKM Semiconductor, Inc., ak4140 Datasheet - Page 27

• Manufacturer Part Number: ak4140
• Description: Digital Btsc Decoder
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4140 has a digital output volume (25 levels, 1dB step, Mute). The L4-0 and R4-0 bits can set the volume. The
volume is placed in front of a stereo matrix block. The input data of the digital volume is changed from +12 to –12dB or
MUTE. When the VOLC bit = “1” (default), the L4-0 bits control both Lch and Rch attenuation levels. When the VOLC
bit = “0”, the L4-0 bits control Lch level and R4-0 bits control Rch level. This volume has a soft transition function. When
changing levels, transitions are executed with soft changes; thus no switching noise occurs during these transitions. The
transition time of 1 level and all levels are shown in Table 17.
MS0547-E-01
Stereo Volume Control
L4
R4
…
…
…
…
1
1
0
0
0
0
0
0
1
1
0
0
0
0
0
0
L3
R3
…
…
…
…
1
1
1
1
1
0
0
0
1
1
1
1
1
0
0
0
L2
R2
…
…
…
…
0
0
1
1
1
0
0
0
0
0
1
1
1
0
0
0
8LRCK
1 Level
Table 17. ATT Transition Time
Table 19. Volume (Rch)
Table 18. Volume (Lch)
Transition Time
R1
L1
…
…
…
…
0
0
1
0
0
1
0
0
0
0
1
0
0
1
0
0
- 27 -
R0
L0
…
…
…
…
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
+12 to -12
192LRCK
Mute (default)
Mute (default)
+12dB
+11dB
+12dB
+11dB
-11dB
-12dB
-11dB
-12dB
+1dB
+1dB
Gain
-1dB
Gain
-1dB
0dB
0dB
…
…
…
…
[AK4140]
2007/03