TDF8544
NXP Semiconductors
I2C-bus controlled 4 50 W power amplifier
Table 10. Instruction byte IB2 …continued
Bit
Description
D2
soft mute channel 1 and channel 3
0 = soft mute disabled
1 = soft mute enabled (mute delay 15 ms)
soft mute channel 2 and channel 4
0 = soft mute disabled
D1
D0
1 = soft mute enabled (mute delay 15 ms)
fast mute all amplifier channels
0 = fast mute disabled
1 = fast mute enabled
Table 11. Instruction byte IB3
Bit
D7
D6
Description
-
amplifier channel 1 and channel 3 gain select
0 = 26 dB
1 = 16 dB
D5
D4
D3
D2
D1
D0
amplifier channel 2 and channel 4 gain select
0 = 26 dB
1 = 16 dB
temperature pre-warning level
0 = warning level at Tj(AV)(pwarn) = 160 C
1 = warning level at Tj(AV)(pwarn) = 135 C
enable or disable channel 3
0 = channel 3 enabled
1 = channel 3 disabled
enable or disable channel 1
0 = channel 1 enabled
1 = channel 1 disabled
enable or disable channel 4
0 = channel 4 enabled
1 = channel 4 disabled
enable or disable channel 2
0 = channel 2 enabled
1 = channel 2 disabled
Table 12. Instruction byte IB4
Bit
Description
D7
common-mode voltage filtered by SVR capacitor
0 = filter common-mode voltage
1 = DC-to-DC converter connected (SVR capacitor not used to filter common-mode
voltage)
TDF8544
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 29 August 2011
25 of 54
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