View PAM8007DHR_8311357.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

pam8007 document number: dsxxxxx rev. 1 - 2 1 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated filterless 3w class-d stereo audio amplifier with dc volume control and headphone output description the pam8007 is a 3w, class-d audio amplifier with headphone amplifier. advanced 64-step dc volu me control minimizes external components and allows speaker volume control and headphone volume control. it offers low thd+n, to produce high-quality sound reproduction. the new filterless architecture allows the device to drive the speaker directly, without low- pass output filters which will save 30% system cost and 75% pcb area. with the same numbers of external components, the efficiency of the pam8007 is much better than class-ab cousins. it can extend the battery life thus be ideal for portable applications. the pam8007 is available in a ssop-24 and sop-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 ? superior low noise ? low pop noise ? efficiency up to 92% ? short circuit protection ? thermal shutdown ? few external components to save the space and cost ? pb-free package applications ? lcd monitors / tv projectors ? notebook computers ? portable speakers ? portable dvd players, game machines ? voip/speaker phones pin assignments
pam8007 document number: dsxxxxx rev. 1 - 2 2 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated typical applications circuit pin descriptions pin number pin name function 1 -out_l left channel negative output 2 pgndl left channel power gnd 3 pgndl left channel power gnd 4 +out_l left channel positive output 5 pvddl left channel power supply 6 mute mute control input (active low) 7 vdd analog vdd 8 inl left channel input 9 ear inl left earphone input 10 vdc analog reference for gain control section 11 volume dc volume control to set the gain of class-d 12 ear out l left earphone output(non-inverting) 13 ear out r right earphone output(non-inverting) 14 vref internal analog reference, connec t a bypass capacitor from vref to gnd 15 line/ear line / earphone switch. speaker output (active low), earphone output (active high) 16 ear ln 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 positive output 22 pgndr right channel power gnd 23 pgndr right channel power gnd 24 -out_r right channel negative output
pam8007 document number: dsxxxxx rev. 1 - 2 3 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 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, 5sec recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit supply voltage range 2.5 to 5.5 v ambient operation temperature range -20 to +85 c junction temperature range -20 to +125 c
pam8007 document number: dsxxxxx rev. 1 - 2 4 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated thermal information parameter package symbol max unit thermal resistance (junction to ambient) ssop-24 ja 90 c/w sop-24 79.2 thermal resistance (junction to case) ssop-24 jc 32 sop-24 27 electrical characteristics (@t a = +25c, v dd = 5v, gain = 24db, 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 12 16 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 0.23 ? n mosfet 0.17 output power p o thd+n = 10% f = 1khz r l = 8 ? 1.55 1.75 w r l = 4 ? 2.85 3.1 thd+n r l = 8 ? , p o = 1w, f = 1khz 0.12 % total harmonic distortion plus noise r l = 4 ? , p o = 2w, f = 1khz 0.15 power supply ripple rejection psrr input ac-gnd, f = 1khz, v pp = 200mv 63 db channel separation cs v o = 1v rms , f = 1khz -88 db oscillator frequency f osc 200 250 300 khz efficiency p o = 1.75w, f =1 khz, r l = 8 ? 85 92 % p o = 3.0w, f =1 khz, r l = 4 ? 80 88 % noise v n input ac-gnd gain = 12db a-weighting 65 v no a-weighting 90 signal noise ratio snr f = 20 ? 20khz, thd = 1% 84 db earphone stage output power p o thd+n = 1%, r l = 32 ? , f = 1khz 69 mw total harmonic distortion plus noise thd+n r l = 32 ? , p o = 10mw, f = 1khz 0.04 % power supply ripple rejection psrr input ac-gnd, f = 1khz, v pp = 200mv 73 db channel separation cs v o = 1v rms , f = 1khz 95 db noise v n input ac-gnd a-weighting 19 v no a-weighting 25 signal noise ratio snr f = 20 ? 20khz, thd = 1% 97 db control section mute current i mute v mute = 0v 8 12 ma shutdown current i shdn v shdn = 0v 20 a shdn input high v sh 1.5 v shdn input low v sl 0.4 mute input high v mh 1.5 v mute input low v ml 0.4 line/ear input high v dh 2.5 v line/ear input low v dl 0.4 over temperature protection otp 150 c over temperature hysteresis oth 30 c
pam8007 document number: dsxxxxx rev. 1 - 2 5 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated typical performance characteristics (@t a = +25c, unless otherwise specified.) speaker
pam8007 document number: dsxxxxx rev. 1 - 2 6 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) speaker
pam8007 document number: dsxxxxx rev. 1 - 2 7 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) speaker
pam8007 document number: dsxxxxx rev. 1 - 2 8 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) earphone output
pam8007 document number: dsxxxxx rev. 1 - 2 9 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.)
pam8007 document number: dsxxxxx rev. 1 - 2 10 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 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 1 -80 -80 33 11.6 -9.2 2 -40 -60 34 12.0 -8.6 3 -34 -50 35 12.4 -8.0 4 -28 -40 36 12.8 -7.4 5 -22 -37.7 37 13.2 -6.8 6 -16 -35.4 38 13.6 -6.2 7 -10 -33.1 39 14.0 -5.7 8 -7.5 -30.8 40 14.4 -5.2 9 -5 -28.5 41 14.8 -4.7 10 -2.5 -27.5 42 15.2 -4.2 11 0 -26.4 43 15.6 -3.7 12 1.5 -25.3 44 16.0 -3.2 13 3.0 -24.2 45 16.4 -2.7 14 4.0 -23.1 46 16.8 -2.2 15 4.4 -22.2 47 17.2 -1.8 16 4.8 -21.4 48 17.6 -1.4 17 5.2 -20.6 49 18.0 -1.0 18 5.6 -19.8 50 18.4 -0.6 19 6.0 -19.0 51 18.8 -0.2 20 6.4 -18.2 52 19.2 0.2 21 6.8 -17.4 53 19.6 0.6 22 7.2 -16.6 54 20.0 0.9 23 7.6 -15.9 55 20.4 1.2 24 8.0 -15.2 56 20.8 1.5 25 8.4 -14.5 57 21.2 1.8 26 8.8 -13.8 58 21.6 2.1 27 9.2 -13.1 59 22.0 2.4 28 9.6 -12.4 60 22.4 2.7 29 10.0 -11.7 61 22.8 2.9 30 10.4 -11.0 62 23.2 3.1 31 10.8 -10.4 63 23.6 3.3 32 11.2 -9.8 64 24.0 3.5
pam8007 document number: dsxxxxx rev. 1 - 2 11 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated application information mute operation the mute pin is an input for controlling the output state of t he pam8007. a logic low on this pi n disables the outputs, and a l ogic high on this pin enables the outputs. this pin may be used as a quick disable or enable of the outputs without a volume fade. quiescent curr ent is listed in the electrical characteristics table. the mute pin can be left floating due to the internal 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 supply. shutdown operation in order to reduce power consumption while not in use, the pam8007 contains shutdown circuitry to turn off the amplifier?s bias circuitry. the amplifier is turned off when logic low is placed on the shdn pi n. by switching the shdn pin connected to gnd, the pam8007 suppl y current draw will be minimized in idle mode. the shdn pi n can be left floating due to the internal pull-up. line/ear operation in order to control the speaker/headphone switch, the pam8007 contains detect circuitry. when line/ear logic low, speaker actic e; when logic high, earphone active. power supply decoupling the pam8007 is a high performance cmos audio amplifier that r equires an adequate power supply decoupling to ensure the output t hd and psrr are as low as possile. power supply decoupling affects low frequency on the power supply leads for higher frey response. o ptimum decoupling is achieved by using tw o capacitors of different types that target different types of noise frequency tranisients, s pike, or digital hash on the line, a good low equivalent-series-resi stance (esr) ceramic capacitor, typically 1. 0f, placed as close as possible to t he device v dd terminal works best. for filtering lower-frequency noise signals, a large capacitor of 10f (ceram ic) 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 des igns. clearly, a certai sized capacitor is needed to couple in low frequencies without severe attenuation. but in many cases the spea kers used in portable systems, whether internal or external, have little ability to reproduce signals below 100hz to 150hz. thus, using a large i nput capacitor may not increase actual system performance. in t his case, inout capacitor (c i ) and input resistance (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 performance is affected by the size of the input coupling capacitor, c i . a larger inout coupling capacitor requires more charge to reac h 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 nmizing the capacitor size based on necessary low frequency r esponse, turn-on pops can be minimized. analog reference bypass capacitor (c byp ) analog reference bypass capacitior (c byp ) is the most critical capacitor and serves severa l important functions. during start-up or recovery from shutdown mode, c byp determines the rate at which the amplifier starts up. t he second function is to reduce noise produced by the power supply caused by coupling into the output dev ice signal. the noise is from the internal analog reference to the amplifier, whic h appears as degraded psrr and thd+n. a ceramic bypass capacitor (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. short circuit protection (scp) the pam8007 has short circuit protection ci rcuitry on the outputs that prevents the device from damage when output-to-output an d 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.
pam8007 document number: dsxxxxx rev. 1 - 2 12 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated application information (cont.) over temperature protection thermal protection on the pam8007 prevents the device from damage when the internal die temperature exceeds +150c. there is a 15 degree tolerance on this trip point from dev ice to device. once the die temperature exceeds the thermal set point, the device o utputs are disabled. this is not a latched fault. the t hermal fault is cleared once the temperature of the die is reduced by +30c. this l arge hysteresis will prevent motor boating sound well. the devic e begins normal operation at this point without external system interaction. how to reduce emi (elect ro magnetic interference) a simple solution is to put an additional capacitor 1000f at power supply terminal fo r 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 s eparate 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 the perfect point to which the output noise ground trace should retu rn. also note that output noise ground is channel specific. a two channel amplifier has two seperate channels and consequently must have two seper ate output noise ground traces. the layout of the pam8007 offers separate pgnd connections for each channel and in some cases each side of the bridge. output noise grounds must be tied to system ground at the power in exclusively. signal cu rrents 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 figure 2. top layer figure 3. bottom layer
pam8007 document number: dsxxxxx rev. 1 - 2 13 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated application information (cont.) test setup for performance testing (class d) 1. when the pam8007 works with lc filters, it should be connected with the speaker before it's powered on, otherwise it will be damaged easily. 2. when the pam8007 works without lc filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppre ssing the possible electromagnetic interference. 3. the absolute maximum rating of the pam8007 operation voltage is 6.0v. when the pam8007 is powered with four battery cells, i t should be noted that the voltage of four new dry or alkaline batteri es is over 6v, higher than its maximum operation voltage, which p robably make the device damaged. therefore, it's recommended to use either fo ur ni-mh (nickel metal hydride) rechargeable batteries or three 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 pam8007 has big gain, it will make the device damaged. 5. when testing the pam8007 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.
pam8007 document number: dsxxxxx rev. 1 - 2 14 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated ordering information part number package type standard package pam8007nhr ssop-24 2500 units/tape&reel PAM8007DHR sop24 1000 units/tape&reel marking information
pam8007 document number: dsxxxxx rev. 1 - 2 15 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) ssop-24
pam8007 document number: dsxxxxx rev. 1 - 2 16 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 a product line o f diodes incorporated package outline dimensions (cont.) (all dimensions in mm.) sop-24
pam8007 document number: dsxxxxx rev. 1 - 2 17 of 17 www.diodes.com october 2012 ? diodes incorporated pam8007 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 reserve the right to ma ke modifications, enhancements, im provements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does diodes 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 incorporat ed 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 wh atsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or unauthorized application, customers shall i ndemnify and hold diodes incorporated and its representat ives 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 mu ltiple 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 comp onents 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 inst ructions 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 ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning the ir products and any use of diodes incorporated products in such safety-critica l, life support devices or systems, notwithstanding any devices- or systems-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 arising out of the use of diodes incorporated products in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

▲Up To Search▲

Price & Availability of PAM8007DHR

	To Download PAM8007DHR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .