ANALOG PRODUCTS DIVISION

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288

www.protekanalog.com

69

PA4101

PUNK with µP Supervisor

95000 Rev. 0. 01/08

NOT FOR USE IN LIFE SUPPORT SYSTEMS

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

Functional Diagram Typical Application

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.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

RESET

RESET

GND

NC

NC

µP Mute

Control

6

5

14

8

3

12

9

10

C1 0.1µF

C3 0.5µF

C4 47µF

C5 47µF

R2 220Ω

R4 220Ω

R3 10KΩ

R5 10KΩ

PA4101

Mute1

Mute2

Right Input

Left Input

Left Output

Right Output

Vcc

Vcc

SMUTEOUT

RSET

RST

Chip

OP

13

1

2

4

C2 10µF

R1 500KΩ

RCS