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TAS5721 bảng dữ liệu(PDF) 34 Page - Texas Instruments

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tên linh kiện TAS5721
Giải thích chi tiết về linh kiện  Digital Audio Power Amplifier with EQ, DRC, 2.1 Support, and Headphone/Line Driver
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TAS5721 bảng dữ liệu(HTML) 34 Page - Texas Instruments

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TAS5721
SLOS739 – JULY 2012
www.ti.com
VOLUME REGISTERS (0x07, 0x08, 0x09, 0x0A)
Step size is 0.5 dB
Master volume
– 0x07 (default is mute)
Channel-1 volume
– 0x08 (default is 0 dB)
Channel-2 volume
– 0x09 (default is 0 dB)
Channel-3 volume
– 0x0A (default is 0 dB)
Table 8. Volume Registers (0x07, 0x08, 0x09, 0x0A)
D
D
D
D
D
D
D
D
FUNCTION
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
24 dB
0
0
1
1
0
0
0
0
0 dB (default for individual channel volume) (1)
1
1
1
1
1
1
1
0
–103 dB
1
1
1
1
1
1
1
1
Soft mute (default for the master volume)(1)
(1)
Default values are in bold.
VOLUME CONFIGURATION REGISTER (0x0E)
Bits
Volume slew rate (Used to control volume change and MUTE ramp rates). These bits control the
D2–D0:
number of steps in a volume ramp. Volume steps occur at a rate that depends on the sample rate of
the I2S data as follows:
Sample Rate (KHz)
Approximate Ramp Rate
8/16/32
125 us/step
11.025/22.05/44.1
90.7 us/step
12/24/48
83.3 us/step
Table 9. Volume Control Register (0x0E)
D7
D6
D5
D4
D3
D2
D1
D0
FUNCTION
1
–
–
1
0
–
–
–
Reserved (1)
–
0
–
–
–
–
–
–
Subchannel (ch4) volume = ch1 volume(2)(1)
–
1
–
–
–
–
–
–
Subchannel volume = register 0x0A(2)
–
–
0
–
–
–
–
–
Ch3 volume = ch2 volume(1)
–
–
1
–
–
–
–
–
Ch3 volume = register 0x0A
–
–
–
–
–
0
0
0
Volume slew 512 steps (43-ms volume ramp time at 48 kHz)
–
–
–
–
–
0
0
1
Volume slew 1024 steps (85-ms volume ramp time at 48 kHz) (1)
–
–
–
–
–
0
1
0
Volume slew 2048 steps (171- ms volume ramp time at 48 kHz)
–
–
–
–
–
0
1
1
Volume slew 256 steps (21-ms volume ramp time at 48 kHz)
–
–
–
–
–
1
X
X
Reserved
(1)
Default values are in bold.
(2)
Bits 6:5 can be changed only when volume is in MUTE [master volume = MUTE (register 0x07 = 0xFF)].
34
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: TAS5721



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