View PAM8603ANHR_8900648.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

pam8603a document number: dsxxxxx rev. 1 - 2 1 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated anti-saturation filterless 3w class-d stereo amplifier with dc volume control and headphone output description the pam8603a is a 3w, class-d audio amplifier with headphone amplifier. advanced 64-step dc volume control minimizes external components and allows speaker volume control and headphone volume control. pam unique antisaturation technology which detects output signal clip due to the over level input signal suppress the output signal clip automatically. al so the antisaturation function can adapt the output clip caused by power supply voltage down with battery. it offers low thd+n, to produce highquality sound reproduction. the new filterless architecture allows the device to drive the speaker directly, without low-pass output filters which will save system cost and pcb area. with the same numbers of external components, the efficiency of the pam8603a is much better than class-ab cousins. it can extend the battery life thus be ideal for portable applications. the pam8603a is available in a ssop-24 package. features ? 3w output at 10% thd with a 4 ? load and 5v power supply ? filterless, low quiescent current and low emi ? low thd+n ? 64-step dc volume control ? headphone output function ? unique anti-saturation function ? superior low noise ? low pop noise ? efficiency up to 90% ? short circuit protection ? thermal shutdown ? few external components to save the space and cost ? pb-free package pin assignments applications ? lcd monitors / tv projectors ? notebook computers ? portable speakers ? portable dvd players, game machines ? voip/speakers phones
pam8603a document number: dsxxxxx rev. 1 - 2 2 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical applications circuit pin descriptions pin number pin name function 1 +out_l left channel positive output 2 pgndl left channel power gnd 3 pgndl left channel positive gnd 4 -out_l left channel negative output 5 pvddl left channel power supply 6 mute mute control input (active low) 7 vdd analog vdd 8 in l left channel input 9 ear in l left earphone input 10 vdc analog reference for gain control section 11 volume dc voltage control to set the gain of class-d 12 ear out l left earphone output 13 ear out r right earphone output 14 vref internal analog reference, connect a bypass capacitor from vref to gnd 15 line/ear line/ ear detect 16 ear in r right earphone input 17 inr right channel input 18 gnd analog gnd 19 shdn shutdown control input (active low) 20 pvddr right channel power supply 21 -out_r right channel negaitive output 22 pgndr right channel power gnd 23 pgndr right channel power gnd 24 +out_r right channel positive output
pam8603a document number: dsxxxxx rev. 1 - 2 3 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated functional block diagram absolute maximum ratings (@t a = +25c, unless otherwise specified.) these are stress ratings only and functional operation is not implied. exposure to absolute maximum ratings for prolonged time periods may affect device reliability. all voltages are with respect to ground. parameter rating unit supply voltage 6.0 v input voltage -0.3 to v dd +0.3 maximum junction temperature 150 c storage temperature -65 to +150 soldering temperature 300, 5 sec recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit supply voltage range 2.5 to 5.5 v ambient temperature range -20 to +85 c junction temperature range -20 to +125 c thermal information parameter package symbol max unit thermal resistance (junction to ambient) ssop-24 ja 96 c/w
pam8603a document number: dsxxxxx rev. 1 - 2 4 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated electrical characteristics (@t a = +25c, v dd = 5v, gain = maximum, r l = 8 ? , unless otherwise specified.) parameter symbol test conditions min typ max units class d stage supply voltage range v dd 2.5 5.5 v quiescent current i q no load 10 15 ma output offset voltage v os no load 10 50 mv drain-source on-state resistance r ds(on) i ds = 0.5a p mosfet 0.35 ? n mosfet 0.25 output power p o thd+n = 10%, f = 1khz, anti-saturation off r l = 8 ? 1.55 1.70 w r l = 4 ? 2.85 3.00 thd+n = 1%, f = 1khz, anti-saturation off r l = 8 ? 1.10 1.35 r l = 4 ? 2.3 2.5 f = 1khz, anti-saturation on r l = 8 ? 1.0 r l = 4 ? 2.0 total harmonic distortion plus noise thd+n r l = 8 ? , p o = 0.85w, f = 1khz 0.08 % r l = 4 ? , p o = 1.75w, f = 1khz 0.08 power supply ripple rejection psrr input ac-gnd, f = 1khz, v pp = 200mv, gain =2v/v -70 db channel separation cs p o = 1w, f = 1khz -95 db oscillator frequency f osc 200 250 300 khz efficiency p o = 1.7w, f =1 khz, r l = 8 ? 85 89 % p o = 3.0w, f =1 khz, r l = 4 ? 80 83 % noise v n input ac-gnd a-weighting 220 v no a-weighting 350 signal noise ratio snr f = 20 ? 20khz, thd = 1% 85 db earphone stage quiescent current iq no load 4.5 7.5 ma output offset voltage v os no load 2.5 v output power p o thd+n = 1%, r l = 32 ? , f = 1khz 60 mw total harmonic distortion plus noise thd+n r l = 32 ? , p o = 10mw, f = 1khz 0.02 % power supply ripple rejection psrr input ac-gnd, f = 1khz, v pp = 200mv -75 db channel separation cs p o = 1w , f = 1khz -85 db noise v n input ac-gnd a-weighting 40 v no a-weighting 70 signal noise ratio snr f = 20 ? 20khz, v o = 1v rms 85 db control section under voltage lock-out uvlo 2 mute current i mute v mute = 0v 1 3 ma shutdown current i shdn v shdn = 0v 1 a ear/ line threshold voltage v th 0.65 shdn input high v sh 1.2 shdn input high v sl 0.5 mute input high v mh 1.2 mute input high v ml 0.5 over temperature protection otp 140 c over temperature hysteresis oth 30 c
pam8603a document number: dsxxxxx rev. 1 - 2 5 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical performance characteristics (@t a = +25c, v dd = 5v, r l = 8 ? , g v = 24db, unless otherwise specified.) class-d output
pam8603a document number: dsxxxxx rev. 1 - 2 6 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v dd = 5v, r l = 8 ? , g v = 24db, unless otherwise specified.) class-d output
pam8603a document number: dsxxxxx rev. 1 - 2 7 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) earphone output
pam8603a document number: dsxxxxx rev. 1 - 2 8 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.)
pam8603a document number: dsxxxxx rev. 1 - 2 9 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v dd = 5v, g v = 10db, unless otherwise specified.)
pam8603a document number: dsxxxxx rev. 1 - 2 10 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) table 1. dc volume control step gain (db) class d gain (db) earphone step gain (db) class d gain (db) earphone 0 -75 -75 32 11.6 -9.2 1 -40 -40 33 12.0 -8.6 2 -34 -38 34 12.4 -8.0 3 -28 -36 35 12.8 -7.4 4 -22 -34 36 13.2 -6.8 5 -16 -32 37 13.6 -6.2 6 -10 -30 38 14.0 -5.7 7 -7.5 -29 39 14.4 -5.2 8 -5.0 -28 40 14.8 -4.7 9 -2.5 -27 41 15.2 -4.2 10 0 -26 42 15.6 -3.7 11 1.5 -25 43 16.0 -3.2 12 3.0 -24 44 16.4 -2.7 13 4.0 -23 45 16.8 -2.2 14 4.4 -22.2 46 17.2 -1.8 15 4.8 -21.4 47 17.6 -1.4 16 5.2 -20.6 48 18.0 -1.0 17 5.6 -19.8 49 18.4 -0.6 18 6.0 -19.0 50 18.8 -0.2 19 6.4 -18.2 51 19.2 0.2 20 6.8 -17.4 52 19.6 0.6 21 7.2 -16.6 53 20.0 0.9 22 7.6 -15.9 54 20.4 1.2 23 8.0 -15.2 55 20.8 1.5 24 8.4 -14.5 56 21.2 1.8 25 8.8 -13.8 57 21.6 2.1 26 9.2 -13.1 58 22.0 2.4 27 9.6 -12.4 59 22.4 2.7 28 10.0 -11.7 60 22.8 2.9 29 10.4 -11.0 61 23.2 3.1 30 10.8 -10.4 62 23.6 3.3 31 11.2 -9.8 63 24.0 3.5
pam8603a document number: dsxxxxx rev. 1 - 2 11 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated application information test setup for performance testing (class d) 1. when the pam8603a works with lc filters, it should be connecte d with the speaker before it's powered on, otherwise it will b e damaged easily. 2. when the pam8603a works without lc filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppr essing the possible electromagnetic interference. 3. the absolute maximum rating of the pam8603a operation voltage is 6v. when the pam8603a is powered with four battery cells, i t should be noted that the voltage of four new dry or alkaline batte ries is over 6v, higher than its maximum operation voltage, whic h probably make the device damaged. therefore, it's recommended to use either four ni-mh (nickel metal hydride) rechargeable batteries or t hree dry or alkaline batteries. 4. the input signal should not be too high, if too high, it will cause the clipping of output signal when increasing the volume . because the dc volume control of the pam8603a has big gain, it will make the device damaged. 5. when testing the pam8603a without lc filters by using resistor instead of speaker as the output load, the test results, e.g. thd or efficiency, will be worse than thos e using speaker as load. notes: 1. the audio precision (ap) aux-0025 low pass filt er is necessary for class-d amplifier measurement with ap analyzer. 2. two 22 h inductors are used in series with load resistor to emulate the small speake r for efficiency measurement. anti-saturation function if the preset gain is haigher than 12db, anti-s aturation is active by detecting the duty cycle of the pwm output when the mode been detected, the gain is automatcally adjusted to the value that the output is not clip step by step. the maximum attenuation is -12db (pres et gain = 24db). the attach is immediately and the released time is 250ms per step. mute operation the mute pin is an input for controlling the output state of the pam8603a . a logic low on this pin dis ables the outputs, and a logic hi gh enables the outputs. this pin may be used as a qu ick disable or enable of the outputs without a volume fade. quiescent current is liste d in the electrical characteristic table. the mute pin can be left floating due to the internal pull-up. shutdown operation in order to reduce power consumption while not in use, the pam8603a contains shutdown circuitry to turn off the amplifier's bia s circuitry. the amplifier is turned off when logic low is placed on the shdn pin. by switching the shdn pin connected to gnd, the pam8603a supply current draw will be minimized in idle mode. the shdn pin can be left floating due to the pull-up. for the best power on/off pop performance, the amplifier should be placed in the mute mode prior to turning on/off the power su pply.
pam8603a document number: dsxxxxx rev. 1 - 2 12 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated application information power supply decoupling the pam8603a is a high performance cmos audio amplifier that r equires adequate power supply decoupling to ensure the output thd and psrr are as low as possible. power supply decoupling affects lo w frequency on the power supply l eads for higher frey response. optimum decoupling is achieved by using tw o capacitors of different types that target different types of noise frequency transients, sp ike, or digital hash on the line, a good low equivalent-series-resi sitance (esr) ceramic capacitor, typically 1.0f, placed as close as possible to the device v dd terminal works best. for filtering lower-frequency noise signals, a large capacitor of 10f (cer amic) or greater placed near th e audio power amplifier is recommended. input capacitor (c i ) large input capacitors are both expensive and space hungry for portable designs. clearly , a certain sized capacitor is needed t o capacitor is needed to couple in low frequencies without severe attenuation. but in many cases the speakers used in portable systems, whethe r internal or external, have little ability to reproduce si gnals below 100hz to 150hz. thus, using a large input capacitor may not increase a ctual system performance. in this case, input capacitor (c i ) and input resisitance (r i ) of the amplifier form a high-pass filter with the corner frequency determined equation below, c r 2 1 f i i c = in addition to system cost and size, click and pop perfomance is affected by the size of the input coupling capacitor, c i . a larger input coupling capacitor requires more charge to reach its quiescent dc voltage (nominally ? v dd ). this charge comes from the internal circuit via the feedback and is apt to create pops upon device enable. thus, by mi nimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized. analog refernce bypass capacitor (c byp ) analog refernce bypass capacitor (c byp ) is the most critical capacitor and serves several important functions. during start-up or recovery from shutdown mode, c byp determines the rate at which the amplifier starts up. the second function is to reduc e noise produced by the power supply caused by coupling into the output dr ive signal. this noise is from the inter nal analog reference to the amplifier, whic h appears as degraded psrr and thd+n. a ceramic bypass capacitior (c byp ) of 0.47f to 1.0f is recommended for the best thd and noise performance. increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown. under voltage lock-out (uvlo) the pam8603a incorporates circuitry designed to detect when the s upply voltage is low. when the supply voltage drops to 1.8v or below, the pam8603a outputs are disable, are the device comes out of this state and states to normal functional once v dd 2.0v. short circuit protection (scp) the pam8603a has short circuit pr otection circuitry on the outputs that prevents the device from damage when output-to-output a nd output-to- gnd short. when a short circuit is detected on the outputs, the out puts are disabled immediately. if the short was removed, the device activates again. over temperature protection thermal protection on the pam8603a prevents the device from damage when the internal die temperature exceeds +135c. there is a 15 degree tolerance on this point from devic e to device. once the die temperature ex ceeds the thermal set point, the device out puts are disabled. this is not a latched fault. the thermal fault is cleared once the temperatur e of the die is reduced by 30c. this la rge hysteresis will prevent motor boating sound well. the devic e begins normal operation at this point without external system interaction.
pam8603a document number: dsxxxxx rev. 1 - 2 13 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated application information how to reduce emi (electro magnetic interference) a simple solution is to put an additional capacitor 1000f at powe r supply terminal for power line coupling if the traces from amplifier to speakers are short (< 20cm). most applications require a ferrite bead filter as shown at fi gure 1. the ferrite filter reduces emi around 1mhz and higher. wh en selecting a ferrite bead, choose one with high impedance at high frequenc ies, and low impedance at low frequencies (mh2012hm221-t). figure 1. ferrite bead filter to reduce emi pcb layout guidelines grounding at this stage it is paramount to notice the necessity of separ ate grounds. noise currents in the output power stage need to be returned to output noise ground and nowhere else. were these currents to circulate elsewhere, they may get into the power supply, the signal groun d, etc, worse yet, they may form a loop and radiate noise. any of these case s results in degraded amplifier performance. the logical returns for the output noise currents associated with class-d switching are the respec tive pgnd pins for each channel. the switch state diagram illust rates that pgnd is instrumental in nearly every switch state. this is t he perfect point to which the output noise ground trace should retu rn. also note that output noise ground is channel specific. a two channel amplifie r has two seperate channels and c onsequently must have two seper ate output noise ground traces. the layout of the pam8603a offers separate pgnd connections for each channel and in some cases each side o f the bridge. output noise grounds must be tied to system ground at th e power in exclusively. signal currents for the inputs, referen ce, etc need to be returned to quite ground. this ground is only tied to the signal components and the gnd pin, and gnd then tied to system ground . pcb layout example
pam8603a document number: dsxxxxx rev. 1 - 2 14 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated ordering information part number package type standard package PAM8603ANHR ssop-24 2500 units/tape&reel marking information
pam8603a document number: dsxxxxx rev. 1 - 2 15 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) ssop-24
pam8603a document number: dsxxxxx rev. 1 - 2 16 of 16 www.diodes.com november 2012 ? diodes incorporated pam8603a a product line o f diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

▲Up To Search▲

Price & Availability of PAM8603ANHR

	To Download PAM8603ANHR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .