ICs for Digital Still Camera
1
Publication date: August 2001 SDB00078AEB
AN2905FHQ
Sound input/output interface IC for digital still camera
a73 Overview
The AN2905FHQ is a sound input/output interface IC
which is optimum for incorporation of sound functions in
a digital still camera. The sound pre-processing prior to the
digital processing and sound post-processing after DAC
are integrated on a single chip. This IC is effective to make
the equipment compact.
a73 Features
• Functions required for the sound pre- and post-processings
are integrated on a single chip
• The built-in microphone amp. and microphone power
supply
• A built-in 0.5 W BTL amp.
• Built-in SP power save and electronic volume func-
tions
• A beep circuit with electronic volume
• A built-in internal microphone amp. on/off function
• A built-in AGC switch
• A built-in AGC to a speaker amp.
(Prevents the sound distortion, trembling sound and wire
breakdown of the speaker at excessively high voltage
signal input)
a73 Applications
• Digital still camera (DSC)
LQFP048-P-0707A
Unit: mm
24
25
12
13
36
37
1
0° to 10°
0
.1
5
±
0.05
48
(0.75)
1.70 max.
0.10
±
0.20
1.40
±
0.10
Seating plane
9.00
±
0.20
7.00
±
0.20
(1.00)
0.50±0.20
(0.75) 0.20±0.05
9.00±0.20
7.00±0.20
0.50
M0.10
a73 Application Circuit
Microphone input
Speaker
Power supply for microphone
Line output Beep input
Playback input
Recorder output
D/A converter
A/D converter