GMA7496LS20T View Datasheet(PDF) - Gamma Microelectronics Inc.
Part Name
Description
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GMA7496LS20T Datasheet PDF : 12 Pages
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GMA7496L
2W+2W AMPLIFIER WITH DC
VOLUME CONTROL
Electrical Characteristics (continued)
Refer to the test circuit: VS = 14V, RL = 80Ω, Rg = 50 Ω, TA = 25ºC
Parameter
Symbol
Test Condition
MUTE STAND-BY & INPUT SELECTION FUNCTIONS
Stand-by ON Threshold
VST ON
Stand-by OFF Threshold
VST OFF
Mute ON Threshold
VM ON
Mute OFF Threshold
VM OFF
Quiescent Current @ Stand-by IqST-BY
Mute Attenuation
AMUTE
Stand-by Bias Current
IST-BYBIAS
Stand by on VST-BY = 5V
Play or Mute
Mute Bias Current
ImuteBIAS
Mute
Play
Min Typ Max Unit
3.5
V
1.5
V
3.5
V
1.5
V
0.6
1
mA
50
65
dB
80
µA
-20
-5
1
5
µA
0.2
2
Application Suggestions:
The recommended values of the external components are those shown in the application circuit of figure 1.
However, different values can be used from the following table of references for further helpr.
Component
R1
R2
P1
C1
C2
C3
C4
C5
C6
C7
C8
C9
Suggestion
Value
300K
10K
50K
1000µF
470nF
470nF
470µF
100nF
1000µF
1µF
1000µF
100nF
Purpose
Volume control circuit
Mute time constant
Volume control circuit
Supply voltage bypass
Larger than
Suggestion
Longer volume regulation
time
Longer mute on/off time
Input DC decoupling Lower low frequency cutoff
Input DC decoupling Lower low frequency cutoff
Ripple rejection
Volume control time
constant
Better SVR
Larger volume regulation
time
Output DC decoupling Lower low frequency cutoff
Mute time constant
Longer mute on/off time
Output DC decoupling Lower low frequency cutoff
Supply voltage bypass
Smaller than
Suggestion
Shorter volume regulation
time
Shorter mute on/off time
Danger of oscillation
Higher low frequency
cutoff
Higher low frequency
cutoff
Worse SVR
Smaller volume regulation
time
Higher low frequency
cutoff
Shorter mute on/off time
Higher low frequency
cutoff
Danger of oscillation
5
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