PA4401 click-pop suppression device analog products division 561 e. elliot road #175 chandler, az 85225 tel: (480) 539-2900. fax: (480) 632-1715 www.protekanalog.com 95025. rev0.0 12/10; patent pending; confiden tial; covered by non disclosure agreement not for use in life support systems output startup & shutdown control input vcc PA4401 pre amp input pre amp output features 9v or 12v operation 3v rms capability power-up and power-down ?pop? suppression esd protected outputs 8-lead soic package series operation only 1 external component required ron (on resistance): 0.8 ohms ron flatness: 0.4 ohms total harmonic distortion: <1% current drain: <5ma load: 600 ohms applications portable dvd players set-top boxes car audio high end audio televisions stereo systems digital video recorders lcd tvs home theater systems pin layout and description general description the PA4401 provides click-pop suppression for devices that lack a click-less/pop-less start up or shutdown. the PA4401 is placed between the codec and the output coupling capacitor. the click-pop noise is generated at the coupling capacitors while the system is starting up as well as shutting down. the PA4401 controls the ramping of the dc voltage into the coupling capacitors thus reducing the click-pop noise generated during the st artup and shutdown. the start time can be controlled or changed using an external capacitor. esd protection circuits are pr ovided at the inputs and outputs of the device. the PA4401 consumes less than 5ma of current and provides a thd of less than 1% for a load of 600 ohms. the PA4401 is available in an 8l-soic and dfn-6 packages. functional diagram figure 1: functional block diagram of PA4401 ordering information temperature range package part number soic-8 PA4401dq-t7 -40 to 85 c dfn-6 PA4401dn-t7 sel logic system voltage sel status 9v ground 12v v cc pin symbol designation 1 vcc voltage 2 in1 audio input 1 3 in2 audio input 2 4 sel select 12 or 9volt operation 5 gnd ground 6 out2 audio output 2 7 out1 audio output 1 8 cext external capacitor 95025 soic-8 1 2 3 4 5 6 7 8 v cc in 1 in 2 sel gnd out 2 out 1 c ext dfn-6 1 2 3 4 5 6 7 8 v cc in 1 in 2 sel gnd out 2 out 1 c ext
PA4401 click-pop suppression device analog products division 561 e. elliot road #175 chandler, az 85225 tel: (480) 539-2900. fax: (480) 632-1715 www.protekanalog.com 95025. rev0.0 12/10; patent pending; confiden tial; covered by non disclosure agreement not for use in life support systems absolute maximum ratings (all voltages are referenced to gnd) v cc ........................................................................................+15v continuous current (in_, out_) .....................................150ma continuous current (all other pins) .................................20ma continuous power dissipation (t a = +70c) operating temperature range ...........................-40c to +85c storage temperature range .............................-65c to +150c junction temperature ......................................................+150c lead temperature (soldering, 10s) .................................+300c stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. electrical characteristics. unless otherwise specified, v dd =12v, sel = v dd ,t a = ambient temperature = 25 c . limit symbol parameter condition min typical max unit v dd power supply normal operation 9.0 12.0 v i dd supply current normal operation 5 ma t a ambient temperature normal operation -40 +85 oc v gate = 10v, i dfet = 100ma 1.8 2.0 v gate = 15v, i dfet = 100ma 1.5 1.8 r on fet on resistance v gate = 20v, i dfet = 100ma 1.3 1.5 ? r flat(on) on resistance flatness over input voltage range 15 m ? thd total harmonic distortion r l = 600 ? , v sig = 2v rms f = 1khz .020 1 % x talk crosstalk (on) f = 20khz -100 db q irr off isolation f = 20khz r l = 600 ? -108 db v sig analog signal range normal operation 2.0 v rms v esd esd protection hbm 4 kv r out output discharge resistor 100 k ? f co bandwidth >100 khz v uvlo power off threshold v cc falling 90% v cc
PA4401 click-pop suppression device analog products division 561 e. elliot road #175, chandler, az 85225 tel: (480) 539-2900. fax: (602) 414-5141 www.protekanalog.com 95025. rev.0. 05/2008 not for use in life support systems pre amp codec + + pre amp power amp power amp detailed description figure2. shows the normal setup of a pre amplifier system. since the system is built on a single ended power supply the outputs of the pre-amplifier need to be routed through a bypass capacitor to get rid of the dc bias. figure 2: normal setup for a pre amplifier output when the power supply to the system is turned on there is a sp ike in the output of the system because of the charging of various components in the system. this spike is called a ? click or pop noise ?. when this click/pop noise passes through the power amplifiers, the noise is amplified and listeners hear an audible ?pop? which causes discomfort. the reverse operation happens when the system is powering down. these operations are shown below in figure3. the top waveform shows the power supply powering up and powering down. the middle waveform shows the voltage appearing at the positive terminal of the bypass capacitor. the bottom waveform shows the voltage at the out put of the bypass capacitor. this is the pop-noise that is amplified by the power amplifier. figure 3: power up and power down sequences and waveforms t t v cc v cc/2 0 0 >500mv start-up ?pop? time msec 50ms 50ms >500mv shutdown ? p o p ? power supply waveform bypass capacitor input plate system output
PA4401 click-pop suppression device analog products division 561 e. elliot road #175, chandler, az 85225 tel: (480) 539-2900. fax: (602) 414-5141 www.protekanalog.com 95025. rev.0. 05/2008 not for use in life support systems pre amp codec + + pre amp PA4401 in out in out v cc connection diagram the PA4401 will be placed after the pre-amplif ier and before the output bypass capacitors. figure 4: typical connection configuration for PA4401 startup at startup, the power supply ramps from 0v to v cc between 20 -200ms. the PA4401 detects t he ramp in the voltage at its inputs and controls the ramp rate of the dc bias voltage going to the +ve terminal of the bypass capacitor. the ramping behavior of th e device can be controlled by an external capacitor. this startup operation is shown in figure 5. shutdown at shutdown, the PA4401 detects a ?power fail? condition and the control switches are tur ned off, opening the connection between inx and outx providing a discharge path through an internal 100k ? resistor for the bypass capacitor. the time constant of the internal resistor and by-pass capacitor, allows for a slow discharge, which will prevent any audible ?pop? appearing at the system output. this shutdo wn operation is shown in figure 5. figure 5: power-up and power-down sequences and waveforms with PA4401 t t v cc v cc 0 0 <50mv start-up ?pop? time msec 50ms 50ms <50mv shutdown ?pop? PA4401 slows down transition at coupling capacitor power supply waveform bypass capacitor input plate system output
PA4401 click-pop suppression device analog products division 561 e. elliot road #175, chandler, az 85225 tel: (480) 539-2900. fax: (602) 414-5141 www.protekanalog.com 95025. rev.0. 05/2008 not for use in life support systems test circuit for turn-on time vs. c ext and turn-off time vs. c ext c ext (nf) t on (ms) t off (ms) 1 3.6 23 10 12 23 100 42 28 1000 300 32 2200 690 48 control element in x v outx v dd c ext c 1 1m ? r 1 50% 50% t on 90% 10% t off v inx v outx turn-on time vs. cext 0 100 200 300 400 500 600 700 800 1 10 100 1000 10000 capacitor value (nf) turn-on time (ms) turn-off time vs. cext 0 10 20 30 40 50 60 1 10 100 1000 10000 capacitor value (nf) turn-off time (ms)
PA4401 click-pop suppression device analog products division 561 e. elliot road #175, chandler, az 85225 tel: (480) 539-2900. fax: (602) 414-5141 www.protekanalog.com 95025. rev.0. 05/2008 not for use in life support systems + 0.0i0? (0.25 mm) m t b s a s so-8 package outline & dimensions so-8 package dimensions millimeters inches dim min max min max a b c d f g j k p r 4.80 3.80 1.35 0.35 0.40 1.27 bsc 0.18 0.10 5.80 0.25 5.00 4.00 1.75 0.49 1.250 1.27 bsc 0.25 0.25 6.20 0.50 0.189 0.150 0.054 0.014 0.016 0.05 bsc 0.007 0.004 0.229 0.010 0.196 0.157 0.068 0.019 0.049 0.05 bsc 0.009 0.008 0.244 0.019 package outline -a- 8 5 -b - p + 0.0i0? (0.25 mm) m b m 4 pl i 4 d g c 45 0 - i0 -t- j f 8 pl mounting pad 0.050 + 0.005? 0.030 + 0.005? 0.i60 + 0.005? 0.245? m!" 0.045 + 0.005? notes 1. - t - = seating plane and datum surface. 2. dimensions ?a? and ?b? are datum. 3. dimensions ?a? and ?b? do not include mold protrusion. 4. maximum mold protrusion is 0.015? (0.380 mm) per side. 5. dimensioning and tolerances per ansi y14.5m, 1982. 6. dimensions are exclusive of mold flash and metal burrs. tape & reel/bulk ordering nomenclature 1. surface mount product is taped and reeled in accordance with eia-481. 2. suffix-t7 = 7 inch reel - 1,000 pieces per 12mm tape. 3. suffix-t13 = 13 inch reel - 2,500 pieces per 12mm tape. 4. no suffix = product shipped in tubes of 98 pcs per tube. outline & dimensions: rev 1 - 11/01, 06009
PA4401 click-pop suppression device analog products division 561 e. elliot road #175, chandler, az 85225 tel: (480) 539-2900. fax: (602) 414-5141 www.protekanalog.com 95025. rev.0. 05/2008 not for use in life support systems package outline and dimensions dfn-8 millimeters dim min typ max p1 2.95 3.00 3.05 p2 2.95 3.00 3.05 p3 0.70 0.75 0.80 l1 0.23 0.25 0.27 l2 0.35 0.40 0.45 l3 0.02 0.02 0.02 p 0.60 0.65 0.70 g1 2.25 2.30 2.35 g2 1.50 1.55 1.60 tape and reel specifications reel dia a0 b0 k0 d e f w p0 p2 p t-max 178 (7?) 3.000.10 3.000.10 0.850.10 1.500.10 1.750.10 3.500.05 12.000.30 4.000.10 2.000.05 4.000.10 0.25 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 a pproval of the president of protek devices. p3 l3 side view recommended land pattern 2.74mm 1.85mm 2.60mm 0.65mm 0.60mm 0.30mm p0 p2 d a0 b0 p e f w pin 1 indicated b y dot k0 top cover tape t 10 pitches cumulative tolerance on tape 0.2 p1 p2 top view l2 l1 p g2 bottom view g1 1 4 pin 1 indicator PA4401 xxxx PA4401 xxxx PA4401 xxxx PA4401 xxxx
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