Datasheet

TPA2028D1
SLOS660B –JANUARY 2010–REVISED SEPTEMBER 2012 www.ti.com
AGC CONTROL (Address: 6)
REGISTER I
2
C
LABEL DEFAULT DESCRIPTION
ADDRESS BIT
06 (06
H
) – 7 Output Limiter 0 (enable) Disables the output limiter function. Can only be disabled when the AGC
AGC Control Disable compression ratio is 1:1 (off)
6:5 NoiseGate 01 (4 mV
rms
) Select the threshold of the noise gate
Threshold
Threshold
00 1 mV
rms
01 4 mV
rms
10 10 mV
rms
11 20 mV
rms
4:0 Output Limiter 11010 (6.5dBV) Selects the output limiter level
Level
Output Power Peak Output
dBV
(Wrms) Voltage (Vp)
00000 0.03 0.67 –6.5
00001 0.03 0.71 –6
00010 0.04 0.75 –5.5
(Limiter level increases by 0.5dB with every step)
11101 0.79 3.55 8
11110 0.88 3.76 8.5
11111 0.99 3.99 9
Output Limiter This bit disables the output limiter function when set to 1. Can only be disabled when
Disable the AGC compression ratio is 1:1
NoiseGate Threshold These bits set the threshold level of the noise gate. NoiseGate Threshold is only
functional when the compression ratio is not 1:1
Output Limiter Level These bits select the output limiter level. Output Power numbers are for 8Ω load.
AGC CONTROL (Address: 7)
REGISTER I
2
C
LABEL DEFAULT DESCRIPTION
ADDRESS BIT
07 (07
H
) – 7:4 Max Gain 1100 (30 dB) Selects the maximum gain the AGC can achieve
AGC Control
Gain
0000 18 dB
0001 19 dB
0010 20 dB
(gain increases by 1 dB with every step)
1100 30 dB
3:2 UNUSED 00
1:0 Compression 10 (4:1) Selects the compression ratio of the AGC
Ratio
Ratio
00 1:1 (off)
01 2:1
10 4:1
11 8:1
Compression Ratio These bits select the compression ratio. Output Limiter is enabled by default when the
compression ratio is not 1:1.
Max Gain These bits select the maximum gain of the amplifier. In order to maximize the use of the
AGC, set the Max Gain to 30dB
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