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Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 7

Technical content

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 t he -40°C to +85°C temperature range. 95000 RESET RESET VCC MCUVCC RCS MUTECONT GND MUTE1 MUTE2 SMUTEOUT CHIPOP CEXT NC NC µP Mute Control 8 3 12 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 µP VCC Chip OP 1 2 4 C2 10µF R1 500KΩ CEXT RCS

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288 www.protekanalog.com PA4101 PUNK with µP Supervisor 95000 Rev. 0. 01/08 NOT FOR USE IN LIFE SUPPORT SYSTEMS Absolute Maximum Ratings Sustained operation at or above the following ratings is not recommended. Catastrophic and irreversible damage will occur to the device at or above these ratings. Symbol Description Rating VX Voltage at any pin -0.3 to 7.0+0.3 V IX Current at any pin 500mA TA Ambient Temperature 150 ° C TS Storage Temperature 200 ° C TSOL Soldering Temperature 270 ° C Recommended Operating Conditions: Unless otherwise specified, VDD=2.7±10%, TA = Ambient Temperature = 25 deg C. DC Operating Conditions Limit Symbol Parameter Condition Min Typ Max Unit VDD Positive Power Supply Operating 2.7 5.5 V IDD VDD Current Operating 1 mA TA Ambient Temperature Operating -30 85 °C VOH Logic High O/P Voltage IOH=100 μA VDD-0.1 V VOL Logic Low O/P Voltage IOL=-100 μA 0.2 V VIH Logic High I/P Voltage IIH=1 μA VDD-0.3 V VIL Logic Low I/P Voltage IIL=1 μA 0.3 V RON FET ON Resistance VDD=2.7V, VDFET=0.4V 1.5 Ω Supervisor Operating Conditions Limit Symbol Parameter Condition Min Typ Max Unit VRST Reset Voltage Operating 2.5 V VRSTH Reset Threshold VDD falling -40 to 85 degC -2.5 2.5 % VHYS Reset Threshold hysteresis VDD=2.7V 17 29 mV VHYS Reset Threshold hysteresis VDD=5.5V 36 60 mV TRD VDD – Reset Delay VDD falling at 1mv/ μs 20 μs TRP Reset Time Out Period 44 75 ms

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288 www.protekanalog.com PA4101 PUNK with µP Supervisor 95000 Rev. 0. 01/08 NOT FOR USE IN LIFE SUPPORT SYSTEMS Mute Operating Conditions Limit Symbol Parameter Condition Min Typ Max Unit MOFFD Mute release delay Mute Control=VIL Set by ext. capacitor CM 10 300 mS MSTD Soft mute fall/rise time Mute Control transitions to VIH. Set by ext. capacitor CEXT 1 300 mS MPDEL Mute ON Delay Power drops by 10% 5 μS NFETV NFET open drain volt 12 V Pin Out Pin Name Function RESET Inverted Reset output from the voltage supervisor 2 RESET Reset output from the voltage supervisory circuit. 3 VCC Positive power supply. 2.7V to 5.5V ±10%

4 MCUVCC Microprocessor power supply

5 RCS Power On mute delay resistor-capacitor connection. 6 MUTECONT Mute control signal from microprocessor. 8 GND Ground.

9 MUTE1 Open Drain output of NFET 1

10 MUTE2 Open Drain output of NFET 2

12 SMUTEOUT Soft Mute OUT for multiple channels. 13 CHIPOP Supply voltage selector. Conne ct to GND for 2.7V, VCC for 5.5V. 14 CEXT Soft mute delay capacitor. Operation Of Supervisor Circuit. The reset input of a µP initializes the device into a known state. The PA4101 supervisor circuitry asserts a forced reset output to prevent code execution errors during Power-up, power-down and brownout conditions. RESET is valid for V CC >1Volt. Once VCC exceeds the threshold, an internal timer maintains the output for the reset period timeout. After this interval, reset goes high. Any time VCC drops below the reset threshold, the reset activates. When VCC again rises above the threshold, the internal timer starts. Reset holds until VCC exceeds the reset threshold for longer than the reset timeout period. After this time the reset release Supervisor Application VCC RESET GND R C VIN VOUT VRSTH RESET VIN VOUT tRP

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288 www.protekanalog.com PA4101 PUNK with µP Supervisor 95000 Rev. 0. 01/08 NOT FOR USE IN LIFE SUPPORT SYSTEMS VCC RCS GND MUTECONT MUTE 1 MUTE 2 C16 10µF C12 1µF C14 10µF R15 10K R16 10K R14 22K R13 240K C13 10µF C15 10µF R17 100Ω R19 100Ω R21 10K 74LS04 SMUTEOUT CEXT R18 10K R20 10K LINE OUT LEFT LINE OUT RIGHT VCC 3.3V FUNCTION. GENERATOR 1V PTP 1KHz SINE WAVE V.S. 1 8 14 Typical Application Audio Muting. Notes: 1. A Set Top Box audio output is “simulated” using C14, R15, R16 and VS 1. 2. VS 1 is a signal generator having an output impedance of 50Ohm. 3. U2 is the IC 74LS04. 4. U2 runs off of PUNK Vcc (Output of D1, C16 and R14). 5. Input to U2 is the Set Top Box Vcc 6. Switch S1 serves as a manual “Audio Mute” to enable the muting function. 7. Scope probes were attached to Set Top Box Power Supply and Line Out. 8. Waveform shown in Figure 4 to Figure 9

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288 www.protekanalog.com PA4101 PUNK with µP Supervisor 95000 Rev. 0. 01/08 NOT FOR USE IN LIFE SUPPORT SYSTEMS Package Layout and Dimensions Life Support Policy PROTEK ANALOG'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF PROTEK DEVICES Inches Dim MIN TYP MIN P1 0.337 0.341 0.346 P2 0.230 0.238 0.244 P3 0.060 0.065 0.070 P4 0.150 0.155 0.157 L1 0.014 0.016 0.019 L2 0.007 0.009 0.010 L3 0.023 0.026 0.029 p 0.050 0.050 0.050 g 0.004 0.006 0.008 g p TOP VIEW SIDE VIEW END VIEW 0.245” MIN 0.030” ± 0.005” 0.160” ± 0.005” 0.045” ± 0.005” 0.050” TYP Recommended Pattern Layout