Datasheet

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TPA2008D2
SLOS413C – JULY 2003 – REVISED MAY 2004
Table 1. TYPICAL DC VOLUME CONTROL
VOLTAGE ON VOLUME PIN VOLTAGE ON VOLUME PIN
TYPICAL GAIN OF AMPLIFIER
(V) (V)
(dB)
(1)
(INCREASING OR FIXED GAIN) (DECREASING GAIN)
0-0.33 0.31-0 -38
(2)
0.34-0.42 0.43-0.32 -37
0.43-0.52 0.54-0.44 -35
0.53-0.63 0.64-0.55 -33
0.64-0.75 0.75-0.65 -31
0.76-0.86 0.86-0.76 -29
0.87-0.97 0.97-0.87 -27
0.98-1.07 1.08-0.98 -25
1.08-1.18 1.19-1.09 -23
1.19-1.30 1.32-1.20 -21
1.31-1.41 1.42-1.33 -19
1.42-1.52 1.53-1.43 -17
1.53-1.63 1.63-1.54 -15
1.64-1.75 1.75-1.64 -13
1.76-1.85 1.84-1.76 -12
1.86-1.96 1.96-1.85 -10
1.97-2.07 2.09-1.97 -8
2.08-2.18 2.19-2.10 -6
2.19-2.30 2.33-2.20 -4
2.31-2.40 2.43-2.34 -2
2.41-2.52 2.49-2.44 0
(2)
2.53-2.63 2.62-2.50 2
2.64-2.75 2.75-2.63 4
2.76-2.87 2.85-2.76 6
2.88-2.98 2.99-2.86 8
2.99-3.10 3.12-3.00 10
3.11-3.22 3.25-3.13 12
3.23-3.33 3.36-3.26 14
3.34-3.47 3.48-3.37 16
3.48-3.69 3.64-3.49 18
3.70-V
DD
V
DD
-3.65 20
(2)
(1) The typical part-to-part gain variation can be as large as ±2 dB (one gain step).
(2) Tested in production.
The volume control circuitry of the TPA2008D2 is internally referenced to the VDD and AGND terminals. Any
common-mode noise between the VOLUME terminal and these terminals will be sensed by the volume control
circuitry. If the noise exceeds the step size voltage, the gain will change. In order to minimize this effect, care
must be taken to ensure the signal driving the VOLUME terminal is referenced to the VDD and AGND terminals
of the TPA2008D2. See section titled, “Special Layout Considerations” for more details.
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