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MAX9756 Evaluation Kit
The effect of long vs. short attack and release times is
shown in Figure 4 by monitoring the gain reduction
control voltage (CT pin) and the output signal wave-
form. To produce representative waveforms the input
signal was a full-volume music signal. The short attack
and release time clearly results in frequent adjustments
to the gain during a passage that, overall, has relatively
constant signal strength. The longer attack and release
times prevent the amplifier from overreacting and help
maintain a smooth gain response, thus preserving more
of the dynamics of the signal while still keeping the
overall signal level in check.
The MAX9756 EV kit provides jumper JU7 for setting
the logic state of DR. See Table 6 for shunt positions.
SHORT ATTACK AND RELEASE TIMES
MAX9756 ALC Overview
Be careful to define each parameter based on the
application ’ s expected use (i.e., typical source materi-
al), speaker impedance, and speaker power rating.
See Table 2 for output power threshold calculations
and attack/release time settings.
For notebook applications in which music CDs and
DVDs are the typical audio source, Maxim recom-
mends an attack time of 495μs and a release time of
990ms with an output power threshold of 1.2W (R L =
8 ? ). Begin with this setting for your initial evaluation. If
the sound quality is not satisfactory, alter the attack and
release time scales to obtain optimum results. To hear
or measure the effect of the ALC settings chosen, a
rapid comparison can be made by simply shorting the
CT pin to GND, disabling ALC.
LONG ATTACK AND RELEASE TIMES
OUTPUT
WAVEFORM
GAIN
REDUCTION
CONTROL
VOLTAGE
Figure 4. The first image illustrates the effect of designing short attack and release times. The gain makes frequent changes, which
can result in undesirable sound. The second image shows the effect of longer attack and release times; showing a smoother gain
response.
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