PA4101
PUNK with µP Supervisor
ANALOG PRODUCTS DIVISION
Features
General Description
The PA4101 is a low power monolithic CMOS mixed signal
device. Its function is to control power supply transition noise
in audio circuits and systems. It requires very few external
components for its operation and works from low to medium
power supply voltages of 2.7V to 5.5V. As the power supply
ramps ON or OFF, the PA4101 ensures that audio inputs to
succeeding amplifiers are switched to a convenient low
impedance voltage rail. This causes the amplifiers to remain
silent as the power supply changes state (from ON to OFF
and vice versa).
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Precision supply voltage monitoring
Reset Timeout Delay
36dB mute attenuation
2.7V to 5.5V single-supply operation
ESD protected outputs
Low supply current
Soft Mute out for driving additional channels
SOIC 14
Applications
Also included in the device is a digital control pin which can be
used by a control device such as a micro controller or a micro-
processor or any other digital controller to enable the audio
mute function. This supervisory circuit provides maximum
flexibility for monitoring power supplies and battery controlled
functions in systems without backup batteries.
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Set-top boxes
Cell phones
PDA’s
Portable DVD players
Portable MP3 players
Notebook Audio
Critical µP Power Monitoring
A Reset is asserted during power up, power down and
brownout conditions. RESET is guaranteed down to Vcc of
1.0V.
Pin Layout
RESET
1
2
14
13
12
CEXT
Low line output. The early warning indicator goes low when
the supply voltage drops to a value 2% higher than the reset
threshold voltage
RESET
VCC
CHIPOP
SMUTEOUT
3
The PA4101 consumes less than 50μA of supply current while
providing more than 36dB of mute attenuation at the audio
lines. ESD (Human Body Model) protection circuitry on the
outputs protects the PA4101 and devices further up the signal
chain.
MCUVCC
4
5
11
10
NC
MUTE2
MUTE1
RCS
6
7
MUTECONT
NC
9
8
The PA4101 is available as a 14L SOIC package and is
specified for operation over the -40°C to +85°C temperature
range.
GND
Functional Diagram Typical Application
RST
µP Mute
RSET
µP VCC
Control
Chip
OP
Right Input
R2 220Ω
Right Output
2
1
4
Vcc
13
6
C4 47µF
R3 10KΩ
Mute2
Mute1
R1 500KΩ
PA4101
10
RCS
CEXT
5
9
C3 0.5µF
14
8
3
12
Left Input
R4 220Ω
Left Output
C2 10µF
C1 0.1µF
C5 47µF
R5 10KΩ
SMUTEOUT
Vcc
561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288
www.protekanalog.com
69
95000 Rev. 0. 01/08
NOT FOR USE IN LIFE SUPPORT SYSTEMS
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