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MAX9756 Evaluation Kit
Table 10. Electrical Components Description for Automatic Level Control Design
STEP
STEP 1
PIN
29
NAME
PREF
COMPONENT
DESIGNATOR
R PREF = R4 + R5
DESCRIPTION
Power-Limiting Input Resistor.
Connect a resistor from PREF to
GND to set the speaker output
EQUATIONS
Sine-Wave Output
? P OUT ?
P PREF = 180 k ? ? ?
? 1 . 166 ?
clamping level. Leave PREF
unconnected to disable ALC.
Gain Selection. GAIN1, GAIN2,
and GAIN3 inputs set the
? R L ?
× ? ?
? 8 ?
STEP 2
2, 3, 4
GAIN1,
GAIN2,
GAIN3
JU2, JU3, JU4
maximum gain for the speaker
and headphone amplifiers. Select
the gain of the amplifier so that the
full-scale output signal is fully
A V = [ 2 ( P OUT × R L ) ]/
V INFS [ V / V ]
compressed at the defined output
power threshold.
If JU10 and JU11 are installed:
C CT = C17 + C18 + C19
Automatic Level Control Attack
STEP 3
35
CT
If JU10 is installed:
C CT = C17 + C18
and Release-Timing Capacitor.
Connect CT to GND to disable
C CT = t ATTACK /
15,000 [F]
or:
ALC.
C CT = C17
RELEASE/
STEP 4
25
DR
JU7
Automatic Level Control Attack to
Release Time Ratio Select.
Hardwire to V DD , GND, or BIAS to
DR
V DD
ATTACK
RATIO
200
5V
V DD
DR
CT
C CT
MAX9756
33nF
PREF
R PREF
180k ?
GND
VALUES SHOWN FOR AN OUTPUT POWER THRESHOLD OF 1.2W WITH AN
R L = 8 ? ATTACK TIME OF 495 μ s AND A RELEASE TIME OF 990ms
Figure 5. Recommended Output Power Threshold, Attack, and
Release Time Components
set the attack to release ratio.
GND
BIAS
633
2000
_______________________________________________________________________________________
9
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