AN5285K Datasheet, PDF (1/5 Pages) Panasonic Semiconductor – Sound level automatic gain control IC

ICs for TV
AN5285K
Sound level automatic gain control IC
s Overview
The AN5285K is a stereo automatic volume control
IC for reducing a difference in volume between broad-
casting stations and between programs. It is a kind of
AGC circuit and reduces a sudden change in sound sig-
nal amplitude by using a proper time constant.
s Features
• Sound level AGC function by VCA gain control
• Prevention of S/N ratio degradation by reducing VCA
gain at no signal (typ. 20 mV[rms] or less)
• AGC function can be switched on and off externally.
• Operating point of VCA gain lowering is adjustable by
means of external resistor.
• Usable for stereo sound system (also usable for monau-
ral sound system) by two VCAs
s Applications
• Televisions and video sets
s Block Diagram
Unit: mm
10
1
6.0±0.3
3.5±0.25
(12.0)
SSIP010-P-0000
LIN ¹
50 kΩ
CTL ⁷
RIN ¹⁰
50 kΩ
VCA
CTL
VCA
Level
sensor 1
SW
Level
sensor 1
Level
sensor 2
V/l reg.
3 _LOUT
8 _ROUT
1