GMA7496L Datasheet, PDF (5/11 Pages) Gamma Microelectronics Inc. – 2W+2W AMPLIFIER W/ DC VOLUME CONTROL

AA
MICROELECTRONICS
Audio Amp.
GMA7496L
2W+2W AMPLIFIER W/ DC VOLUME CONTROL
APPLICATION SUGGESTIONS
The recommended values of the external components are those shown on the application circuit of figure 1A. Different values
can be used, the following table reference for the designer.
Component Suggestion Value Purpose
Larger than Suggestion Smaller than Suggestion
R1
300k
Volume control
Larger volume regulation time Smaller volume regulation time
Circuit
R2
10k
Mute time control
Larger mute on/ off time
Smaller mute on/ off time
Volume control
P1
50k
Circuit
C1
1000µF
Supply voltage
bypass
Danger of oscillation
C2
470nF
Input DC decoupling Lower low frequency cutoff Higher low frequency cutoff
C3
470nF
Input DC decoupling Lower low frequency cutoff Higher low frequency cutoff
C4
470µF
Ripple rejection
Better SVR
Worse SVR
C5
100nF
Volume control time Larger volume regulation
Smaller volume regulation time
costant
time
C6
1000µF
Output DC decoupling Lower Low frequency cutoff Higher low frequency cutoff
C7
1µF
Mute time costant Larger mute on/ off time
Smaller mute on/ off time
C8
1000µF
Output DC decoupling Lower low frequency futoff Higher low frequency cutoff
Supply voltage
C9
100nF
bypass
Danger of oscillation
APPLICATION CIRCUIT
+VS
C1
1000µF
PW_GND _1,2,3,13,
18,19,20
INR
C2 ⁹
30K
470nF
Varout_R
V_S
7
15,16
Volume
OP-Amp
+
-
C3
470nF
4
INL
SVR ¹⁰
C4
470µF
Volume
30K
MUTE/STBY
PROTECTIONS
+
-
OP- Amp
6
Volume
5
Varout_L
C5
100nF
R1
300K
TP1
VOL
P1
50K
LOG
C9
0.1µF
C8
1000µF
14
PW_GND
OUTR
S1 STBY
+5V
11
12
R2 10K
S_GND
C7
60K
1µF
+5V
S2 MUTE
17
OUTL
C6
1000µF
PW_GND
+5V
5