PA4101 Datasheet, PDF (1/7 Pages) Protek Devices – PUNK with μP Supervisor

ANALOG PRODUCTS DIVISION
PA4101
PUNK with µP Supervisor
Features
• 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
• Set-top boxes
• Cell phones
• PDA’s
• Portable DVD players
• Portable MP3 players
• Notebook Audio
• Critical µP Power Monitoring
Pin Layout
RESET
1
RESET
2
V_CC
3
14
C_EXT
13
CHIP_OP
12
SMUTE_OUT
MCUV_CC
4
R_CS
5
MUTE_CONT
6
NC
7
11
NC
10
MUTE₂
9
MUTE₁
8
GND
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).
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.
A Reset is asserted during power up, power down and
brownout conditions. RESET is guaranteed down to Vcc of
1.0V.
Low line output. The early warning indicator goes low when
the supply voltage drops to a value 2% higher than the reset
threshold voltage
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.
The PA4101 is available as a 14L SOIC package and is
specified for operation over the -40°C to +85°C temperature
range.
Functional Diagram Typical Application
µP Mute
Control
Chip
OP
RST
µP V_CC
RSET
Right Input
4
2
1
Vcc
13
6
R1 500KΩ
RCS ₅
C3 0.5µF
C_EXT
14
8
C2 10µF
PA4101
10 ^Mute2
9 ^Mute1
3
12
Left Input
C1 0.1µF
SMUTEOUT
Vcc
R2 220Ω
C4 47µF
R4 220Ω
C5 47µF
Right Output
R3 10KΩ
Left Output
R5 10KΩ
561 E. Elliot Road #175 Chandler, AZ 85225 Tel: [phone]. Fax: [phone]
69
95000 Rev. 0. 01/08
www.protekanalog.com
NOT FOR USE IN LIFE SUPPORT SYSTEMS