ICs for Audio Common Use
1
Publication date: December 2001 SDC00038CEB
AN7531SA
Headphone amplifier IC for portable equipment
a73 Overview
AN7531SA is an audio signal processing IC in
which bass boost amplifiers, ALC circuit and beep
circuit are built in the headphone amplifiers for use
in portable equipment. Its headphone output block
is using the center amplifier method which elimi-
nates the need for coupling capacitor so that the
circuit is most suitable for rationalization of audio
circuit.
a73 Features
• Output coupling capacitor is not required (Center
amplifier method)
• Built-in bass boost amplifiers
• ALC circuit
• Built-in mute circuit
• Built-in beep circuit
• With mixed output pin of power amplifier
a73 Applications
• Portable CD and MD players, etc.
a73 Block Diagram
SSOP024-P-0300B
Unit: mm
24
1
23
2
22
3
21
4
20
5
19
6
18
7
17
8
16
9
15
10
14
11
13
12
BST
SW
Standby
SW
C-amp.
SW
Mute
SW
ATT
SW
ALC
det.
Bias
Beep
Note) The package of this product will be changed to lead-free type
(SSOP024-P-0300E). See the new package dimensions section
later of this datasheet.
7.8±0.3
8.1±0.3
0.1±0.1
1.2±0.20.525±0.1
0.525±0.1
0.15
+0.1 –0.05
6.1±0.3
24 13
1
(0.625)
12
(0.5)
Seating plane0.22
+0.1
–0.05
0.65